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Receptor antagonist

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669:, as it competes with the full agonist for receptor occupancy, thereby producing a net decrease in the receptor activation as compared to that observed with the full agonist alone. Clinically, their usefulness is derived from their ability to enhance deficient systems while simultaneously blocking excessive activity. Exposing a receptor to a high level of a partial agonist will ensure that it has a constant, weak level of activity, whether its normal agonist is present at high or low levels. In addition, it has been suggested that partial agonism prevents the adaptive regulatory mechanisms that frequently develop after repeated exposure to potent full agonists or antagonists. E.g. 335: 556:. While the mechanism of antagonism is different in both of these phenomena, they are both called "non-competitive" because the end-results of each are functionally very similar. Unlike competitive antagonists, which affect the amount of agonist necessary to achieve a maximal response but do not affect the magnitude of that maximal response, non-competitive antagonists reduce the magnitude of the maximum response that can be attained by any amount of agonist. This property earns them the name "non-competitive" because their effects cannot be negated, no matter how much agonist is present. In functional assays of non-competitive antagonists, 280: 604: 638: 463:(active site) as the endogenous ligand or agonist, but without activating the receptor. Agonists and antagonists "compete" for the same binding site on the receptor. Once bound, an antagonist will block agonist binding. Sufficient concentrations of an antagonist will displace the agonist from the binding sites, resulting in a lower frequency of receptor activation. The level of activity of the receptor will be determined by the relative 428: 769:. But, once irreversible bonding has taken place, the receptor is deactivated and degraded. As for non-competitive antagonists and irreversible antagonists in functional assays with irreversible competitive antagonist drugs, there may be a shift in the log concentration–effect curve to the right, but, in general, both a decrease in slope and a reduced maximum are obtained. 2359: 198:. Antagonists mediate their effects through receptor interactions by preventing agonist-induced responses. This may be accomplished by binding to the active site or the allosteric site. In addition, antagonists may interact at unique binding sites not normally involved in the biological regulation of the receptor's activity to exert their effects. 20: 760:
from binding. Inactivation of receptors normally results in a depression of the maximal response of agonist dose-response curves and a right shift in the curve occurs where there is a receptor reserve similar to non-competitive antagonists. A washout step in the assay will usually distinguish between
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determination is independent of the affinity, efficacy or concentration of the agonist used. However, it is important that equilibrium has been reached. The effects of receptor desensitization on reaching equilibrium must also be taken into account. The affinity constant of antagonists exhibiting two
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Uncompetitive antagonists differ from non-competitive antagonists in that they require receptor activation by an agonist before they can bind to a separate allosteric binding site. This type of antagonism produces a kinetic profile in which "the same amount of antagonist blocks higher concentrations
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site. These antagonists bind to a distinctly separate binding site from the agonist, exerting their action to that receptor via the other binding site. They do not compete with agonists for binding at the active site. The bound antagonists may prevent conformational changes in the receptor required
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An antagonist that binds to the active site of a receptor is said to be "non-competitive" if the bond between the active site and the antagonist is irreversible or nearly so. This usage of the term "non-competitive" may not be ideal, however, since the term "irreversible competitive antagonism" may
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and that ligand-specific receptor conformations occur and can affect interaction of receptors with different second messenger systems may mean that drugs can be designed to activate some of the downstream functions of a receptor but not others. This means efficacy may actually depend on where that
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that exhibit intrinsic or basal activity can have inverse agonists, which not only block the effects of binding agonists like a classical antagonist but also inhibit the basal activity of the receptor. Many drugs previously classified as antagonists are now beginning to be reclassified as inverse
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on a receptor, or they may interact at unique binding sites not normally involved in the biological regulation of the receptor's activity. Antagonist activity may be reversible or irreversible depending on the longevity of the antagonist–receptor complex, which, in turn, depends on the nature of
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in the presence of a competitive antagonist as determined on a dose response curve. Altering the amount of antagonist used in the assay can alter the dose ratio. In Schild regression, a plot is made of the log (dose ratio-1) versus the log concentration of antagonist for a range of antagonist
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of each molecule for the site and their relative concentrations. High concentrations of a competitive agonist will increase the proportion of receptors that the agonist occupies, higher concentrations of the antagonist will be required to obtain the same degree of binding site occupancy. In
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Irreversible competitive antagonists also involve competition between the agonist and antagonist of the receptor, but the rate of covalent bonding differs and depends on affinity and reactivity of the antagonist. For some antagonists, there may be a distinct period during which they behave
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or more effects, such as in competitive neuromuscular-blocking agents that also block ion channels as well as antagonising agonist binding, cannot be analyzed using Schild regression. Schild regression involves comparing the change in the dose ratio, the ratio of the EC
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Silent antagonists are competitive receptor antagonists that have zero intrinsic activity for activating a receptor. They are true antagonists, so to speak. The term was created to distinguish fully inactive antagonists from weak partial agonists or inverse agonists.
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targets. Reversible antagonists, which bind via noncovalent intermolecular forces, will eventually dissociate from the receptor, freeing the receptor to be bound again. Irreversible antagonists bind via covalent intermolecular forces. Because there is not enough
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cellular response by binding to the receptor, thus initiating a biochemical mechanism for change within a cell. Antagonists were thought to turn "off" that response by 'blocking' the receptor from the agonist. This definition also remains in use for
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was originally coined to describe different profiles of drug effects. The biochemical definition of a receptor antagonist was introduced by Ariens and Stephenson in the 1950s. The current accepted definition of receptor antagonist is based on the
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Partial agonists are defined as drugs that, at a given receptor, might differ in the amplitude of the functional response that they elicit after maximal receptor occupancy. Although they are agonists, partial agonists can act as a
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Parsons CG, Stöffler A, Danysz W (November 2007). "Memantine: a NMDA receptor antagonist that improves memory by restoration of homeostasis in the glutamatergic system—too little activation is bad, too much is even worse".
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bind to the receptor target and, in general, cannot be removed; inactivating the receptor for the duration of the antagonist effects is determined by the rate of receptor turnover, the rate of synthesis of new receptors.
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to break covalent bonds in the local environment, the bond is essentially "permanent", meaning the receptor-antagonist complex will never dissociate. The receptor will thereby remain permanently antagonized until it is
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the greater the potency of the antagonist, and the lower the concentration of drug that is required to inhibit the maximum biological response. Lower concentrations of drugs may be associated with fewer side-effects.
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and the biochemical definition of a receptor antagonist continues to evolve. The two-state model of receptor activation has given way to multistate models with intermediate conformational states. The discovery of
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on the receptor. A receptor may contain one or more binding sites for different ligands. Binding to the active site on the receptor regulates receptor activation directly. The activity of receptors can also be
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value). This can be calculated for a given antagonist by determining the concentration of antagonist needed to elicit half inhibition of the maximum biological response of an agonist. Elucidating an IC
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Cheng Y, Prusoff WH (December 1973). "Relationship between the inhibition constant (K1) and the concentration of inhibitor which causes 50 per cent inhibition (I50) of an enzymatic reaction".
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values from the Cheng-Prusoff equation, agonist concentrations are varied. Affinity for competitive agonists and antagonists is related by the Cheng-Prusoff factor used to calculate the K
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antagonist–receptor binding. The majority of drug antagonists achieve their potency by competing with endogenous ligands or substrates at structurally defined binding sites on receptors.
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value is useful for comparing the potency of drugs with similar efficacies, however the dose-response curves produced by both drug antagonists must be similar. The lower the IC
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D.E. Golan, A.H Tashjian Jr, E.J. Armstrong, A.W. Armstrong. (2007) Principles of Pharmacology: The Pathophysiologic Basis of Drug Therapy Lippincott Williams & Wilkins
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functional assays using competitive antagonists, a parallel rightward shift of agonist dose–response curves with no alteration of the maximal response is observed.
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Greasley PJ, Clapham JC (December 2006). "Inverse agonism or neutral antagonism at G-protein coupled receptors: a medicinal chemistry challenge worth pursuing?".
210:. It narrows the definition of antagonism to consider only those compounds with opposing activities at a single receptor. Agonists were thought to turn "on" a 291:
to activate the receptors they bind. Antagonists do not maintain the ability to activate a receptor. Once bound, however, antagonists inhibit the function of
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is where the line cuts the x-axis on the regression plot. Whereas, with Schild regression, antagonist concentration is varied in experiments used to derive K
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of the maximal response of agonist dose-response curves, and in some cases, rightward shifts, is produced. The rightward shift will occur as a result of a
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also be used to describe the same phenomenon without the potential for confusion with the second meaning of "non-competitive antagonism" discussed below.
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Bleicher KH, Green LG, Martin RE, Rogers-Evans M (June 2004). "Ligand identification for G-protein-coupled receptors: a lead generation perspective".
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non-competitive and irreversible antagonist drugs, as effects of non-competitive antagonists are reversible and activity of agonist will be restored.
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Agonists get its maximum effect reduced when in the presence of an Irreversible Competitive Antagonist or a Reversible Non-Competitive Antagonist.
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Principles and Practice of Pharmacology for Anaesthetists By Norton Elwy Williams, Thomas Norman Calvey Published 2001 Blackwell Publishing
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Fletcher A, Cliffe IA, Dourish CT (December 1993). "Silent 5-HT1A receptor antagonists: utility as research tools and therapeutic agents".
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Competitive antagonists are used to prevent the activity of drugs, and to reverse the effects of drugs that have already been consumed.
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Leurs R, Church MK, Taglialatela M (April 2002). "H1-antihistamines: inverse agonism, anti-inflammatory actions and cardiac effects".
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Bosier B, Hermans E (August 2007). "Versatility of GPCR recognition by drugs: from biological implications to therapeutic relevance".
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Lees P, Cunningham FM, Elliott J (December 2004). "Principles of pharmacodynamics and their applications in veterinary pharmacology".
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site of the receptor, or by irreversibly binding to the active site of the receptor. The former meaning has been standardised by the
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Agonists require higher dose/concentration to achieve the same effect when in the presence of a reversible competitive antagonist.
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eds, David E. Golan, ed.-in-chief; Armen H. Tashjian Jr., deputy ed.; Ehrin J. Armstrong, April W. Armstrong, associate (2008).
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Ariens EJ (September 1954). "Affinity and intrinsic activity in the theory of competitive inhibition. I. Problems and theory".
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Figure demonstrates the noncompetitive antagonistic behaviour of Phenoxybenzamine on alpha-adrenergiv norepinephrine receptors.
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Many antagonists are reversible antagonists that, like most agonists, will bind and unbind a receptor at rates determined by
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measures the effect of the ability of a range of concentrations of antagonists to reverse the activity of an agonist. The
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Christopoulos A (March 2002). "Allosteric binding sites on cell-surface receptors: novel targets for drug discovery".
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competitively (regardless of basal efficacy), and freely associate to and dissociate from the receptor, determined by
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A non-competitive antagonist is a type of insurmountable antagonist that may act in one of two ways: by binding to an
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Rees S, Morrow D, Kenakin T (2002). "GPCR drug discovery through the exploitation of allosteric drug binding sites".
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Vauquelin G, Van Liefde I, Birzbier BB, Vanderheyden PM (August 2002). "New insights in insurmountable antagonism".
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can have effects similar to those of an antagonist, but causes a distinct set of downstream biological responses.
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May LT, Avlani VA, Sexton PM, Christopoulos A (2004). "Allosteric modulation of G protein-coupled receptors".
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Kenakin T (January 2004). "Efficacy as a vector: the relative prevalence and paucity of inverse agonism".
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Swinney DC (September 2004). "Biochemical mechanisms of drug action: what does it take for success?".
561: 58:. Antagonist drugs interfere in the natural operation of receptor proteins. They are sometimes called 3882: 3726: 3579: 3532: 3172: 3034: 2944: 2785: 2665: 2433: 90:
for their cognate receptors, and binding will disrupt the interaction and inhibit the function of an
219:, substances that have opposing physiological actions, but act at different receptors. For example, 3503: 3082: 2970: 2939: 2585: 2545: 749: 746: 593: 304: 439: with: information about irreversible/insurmountable competitive antagonists. You can help by 3730: 3699: 3430: 3326: 3052: 3002: 2903: 2716: 2695: 2595: 2516: 2428: 2295: 2252: 2020: 1977: 1790: 1731: 1683: 1456: 1330: 1276: 1026: 980: 938:
T. Kenakin (2006) A Pharmacology Primer: Theory, Applications, and Methods. 2nd Edition Elsevier
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Chart demonstrating the difference between agonists, silent antagonists, and inverse agonists
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Pulvirenti L, Koob GF (April 2002). "Being partial to psychostimulant addiction therapy".
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Stevens, E. (2013) Medicinal Chemistry: The Modern Drug Discovery Process. pg. 79, 84
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Colquhoun D (December 2007). "Why the Schild method is better than Schild realised".
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Urban JD, Clarke WP, von Zastrow M, Nichols DE, Kobilka B, Weinstein H, Javitch JA,
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Surin A, Pshenichkin S, Grajkowska E, Surina E, Wroblewski JT (March 2007).
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Our understanding of the mechanism of drug-induced receptor activation and
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that blocks or dampens a biological response by binding to and blocking a
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Frang H, Cockcroft V, Karskela T, Scheinin M, Marjamäki A (August 2001).
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Pharmacology Guide: In vitro pharmacology: concentration-response curves
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or for competitive antagonists in radioligand binding studies using the
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molecule, inhibiting the signal produced by a receptor–agonist coupling.
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Principles of pharmacology: the pathophysiologic basis of drug therapy
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Ritter J, Flower R, Henderson G, Loke YK, MacEwan D, Rang H (2020).
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agonists because of the discovery of constitutive active receptors.
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has been shown to act as a reversible non-competitive antagonist of
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Neubig RR, Spedding M, Kenakin T, Christopoulos A (December 2003).
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raises arterial pressure through vasoconstriction mediated by alpha
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The English word antagonist in pharmaceutical terms comes from the
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at receptors. Antagonists mediate their effects by binding to the
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by the binding of a ligand to other sites on the receptor, as in
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Type of receptor ligand or drug that blocks a biological response
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Patil PN (2002). "Everhardus J. Ariëns (1918–2002): a tribute".
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Hopkins AL, Groom CR (September 2002). "The druggable genome".
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between the receptor and its ligand, at locations called the
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The second form of "non-competitive antagonists" act at an
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Archives Internationales de Pharmacodynamie et de Thérapie
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at a receptor is receptor-independent property of a drug.
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The Journal of Pharmacology and Experimental Therapeutics
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of agonist better than lower concentrations of agonist".
1879:"basic_principles_of_pharm [TUSOM | Pharmwiki]" 440: 552:, and is equivalent to the antagonist being called an 459:
Competitive antagonists bind to receptors at the same
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molecules that can be activated by the binding of a
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Journal of Veterinary Pharmacology and Therapeutics
900: 576:for receptor activation after the agonist binds. 1476:"Taking the time to study competitive antagonism" 407:Enzyme inhibitor § Types of reversible inhibitors 1701: 1699: 1697: 996: 994: 1426: 1424: 1422: 506:Competitive antagonists are sub-classified as 256:receptor is expressed, altering the view that 3213: 2385: 1190: 1188: 1186: 934: 932: 930: 8: 1795:: CS1 maint: multiple names: authors list ( 1292: 1290: 717:have been reclassified as inverse agonists. 681:in pain management and as an alternative to 1386: 1384: 1382: 1348: 1346: 1344: 1245:Vauquelin G, Van Liefde I (February 2005). 311:of an antagonist is usually defined by its 3612: 3418: 3405: 3359: 3220: 3206: 3198: 3152: 3112: 3017: 2990: 2954: 2917: 2878: 2805: 2750: 2680: 2625: 2574: 2536: 2458: 2413: 2392: 2378: 2370: 1758: 1756: 1754: 706:, originally classified as antagonists of 584:. Another example of a non-competitive is 475:(also known as Narcan) is used to reverse 2330: 2168: 1927: 1851: 1583: 1499: 1262: 1220: 1197:"A modification of receptor theory. 1956" 1139: 23:Antagonists will block the binding of an 625:, is an uncompetitive antagonist of the 1708:Fundamental & Clinical Pharmacology 1251:Fundamental & Clinical Pharmacology 800: 685:in the treatment of opioid dependence. 1788: 372:of an agonist alone compared to the EC 347:The affinity of an antagonist for its 287:By definition, antagonists display no 165:. Receptors can be membrane-bound, as 1873: 1871: 1207:(4 Suppl): 106–20, discussion 103–5. 313:half maximal inhibitory concentration 303:. In functional antagonist assays, a 7: 921:participating institution membership 2319:The Journal of Biological Chemistry 1357:(9 ed.). Edinburgh: Elsevier. 1046:Current Opinion in Chemical Biology 3827:Angiotensin II receptor antagonist 3771:Endocannabinoid reuptake inhibitor 3178:Minimum bactericidal concentration 2118:Trends in Pharmacological Sciences 2083:Trends in Pharmacological Sciences 2056:Trends in Pharmacological Sciences 1997:Trends in Pharmacological Sciences 1576:10.1111/j.1476-5381.1975.tb07365.x 1525:Trends in Pharmacological Sciences 1213:10.1111/j.1476-5381.1997.tb06784.x 515: 507: 54:rather than activating it like an 14: 3718:Acetylcholine receptor antagonist 3480:Norepinephrine reuptake inhibitor 2272:Clinical and Experimental Allergy 1560:"An ambiguity in receptor theory" 1474:Wyllie DJ, Chen PE (March 2007). 741:is an example of an irreversible 377:concentrations. The affinity or K 223:lowers arterial pressure through 3168:Minimum inhibitory concentration 2357: 2284:10.1046/j.0954-7894.2002.01314.x 2194:European Journal of Pharmacology 1966:10.1016/j.neuropharm.2007.07.013 1844:10.1016/j.neuropharm.2006.09.018 1720:10.1046/j.1472-8206.2002.00095.x 1405:10.1111/j.1365-2885.2004.00620.x 1264:10.1111/j.1472-8206.2005.00319.x 784:Growth factor receptor inhibitor 426: 181:. Binding occurs as a result of 3846:Vasopressin receptor antagonist 3760:Cannabinoid receptor antagonist 3108:WHO list of essential medicines 2601:Non-specific effect of vaccines 1564:British Journal of Pharmacology 1480:British Journal of Pharmacology 1201:British Journal of Pharmacology 1195:Stephenson RP (February 1997). 699:Constitutively active receptors 588:which binds irreversibly (with 3832:Endothelin receptor antagonist 3696:Acetylcholine receptor agonist 3455:Adrenergic receptor antagonist 3163:Antimicrobial pharmacodynamics 1433:Nature Reviews. Drug Discovery 1003:Nature Reviews. Drug Discovery 837:Nature Reviews. Drug Discovery 825:Retrieved on December 6, 2007. 1: 3664:Glutamate receptor antagonist 3580:Serotonin receptor antagonist 3533:Histamine receptor antagonist 3308:Negative allosteric modulator 3302:Positive allosteric modulator 3088:Functional analog (chemistry) 2151:Vadivelu N, Hines RL (2007). 2130:10.1016/S0165-6147(00)01991-X 2068:10.1016/S0165-6147(02)02068-0 957:Current Pharmaceutical Design 881:. Online Etymology Dictionary 3821:Adenosine reuptake inhibitor 3755:Cannabinoid receptor agonist 3674:Glutamate reuptake inhibitor 3593:Serotonin reuptake inhibitor 3504:Dopamine receptor antagonist 2641:Hill equation (biochemistry) 2206:10.1016/j.ejphar.2006.09.032 2157:Journal of Opioid Management 2009:10.1016/0165-6147(93)90185-m 1621:10.1016/0006-2952(73)90196-2 1355:Rang and Dale's pharmacology 789:Selective receptor modulator 3509:Dopamine reuptake inhibitor 3431:Adrenergic receptor agonist 1558:Schild HO (February 1975). 673:, a partial agonist of the 621:, used in the treatment of 3940: 3800:Opioid receptor antagonist 3654:Glutamate receptor agonist 3575:Serotonin receptor agonist 3528:Histamine receptor agonist 3156:Antimicrobial pharmacology 2636:Dose–response relationship 2566:Desensitization (medicine) 2095:10.1016/j.tips.2007.06.001 1902:Lipton SA (January 2004). 1537:10.1016/j.tips.2007.09.011 1058:10.1016/j.cbpa.2004.04.008 653: 415: 404: 267: 138: 3499:Dopamine receptor agonist 3078:Coinduction (anesthetics) 1132:10.1016/j.bcp.2005.12.038 908:Oxford English Dictionary 745:—it permanently binds to 732:Irreversible antagonists 217:physiological antagonists 183:non-covalent interactions 3765:Endocannabinoid enhancer 3711:Cholinesterase inhibitor 3630:GABA receptor antagonist 3143:Multiple drug resistance 3116:Tolerance and resistance 2484:Physiological antagonist 1609:Biochemical Pharmacology 1235:of the original article. 1120:Biochemical Pharmacology 1081:Receptors & Channels 969:10.2174/1381612043384303 767:receptor-ligand kinetics 727:receptor-ligand kinetics 479:caused by drugs such as 208:receptor occupancy model 196:allosteric binding sites 169:, or inside the cell as 72:calcium channel blockers 3805:Enkephalinase inhibitor 3795:Opioid receptor agonist 3635:GABA reuptake inhibitor 3340:♦ Miscellaneous: 2894:Neuropsychopharmacology 2656:Cheng-Prussoff Equation 2651:Del Castillo Katz model 2578:Other effects of ligand 2561:Receptor (biochemistry) 2479:Irreversible antagonist 1920:10.1602/neurorx.1.1.101 1660:Pharmacological Reviews 1319:10.1124/jpet.106.104463 913:Oxford University Press 177:including those of the 171:intracellular receptors 141:Receptor (biochemistry) 3388:Ion channel modulators 3030:Classical pharmacology 2791:Plasma protein binding 2766:Volume of distribution 2474:Competitive antagonist 2332:10.1074/jbc.M104167200 2229:Molecular Pharmacology 1492:10.1038/sj.bjp.0706997 1114:Negus SS (June 2006). 1093:10.1080/10606820214640 663:competitive antagonist 642: 608: 418:Competitive inhibition 395:competitive inhibition 361:Cheng-Prusoff equation 339: 284: 253:functional selectivity 167:cell surface receptors 32: 3625:GABA receptor agonist 3138:Antibiotic resistance 2930:Clinical pharmacology 2449:Physiological agonist 2409:Ligand (biochemistry) 2170:10.5055/jom.2007.0038 665:in the presence of a 640: 606: 554:allosteric antagonist 416:Further information: 337: 282: 22: 3912:Receptor antagonists 3035:Reverse pharmacology 2945:Pharmacoepidemiology 2786:Biological half-life 2666:Ligand binding assay 2540:Activity at receptor 2434:Irreversible agonist 2366:at Wikimedia Commons 2364:Receptor antagonists 750:adrenergic receptors 594:adrenergic receptors 536:and thus destroyed. 275:Efficacy and potency 241:-adrenergic receptor 3917:Signal transduction 3841:receptor antagonist 3083:Combination therapy 2971:Pharmacoinformatics 2940:Medicinal chemistry 2546:Mechanism of action 911:(Online ed.). 623:Alzheimer's disease 393:that occurs during 305:dose-response curve 62:; examples include 37:receptor antagonist 3229:Pharmacomodulation 3053:Immunopharmacology 3003:Pharmacotoxicology 2904:Psychopharmacology 2696:Intrinsic activity 2596:Pleiotropy (drugs) 2517:Agonist-antagonist 2429:Endogenous agonist 2241:10.1124/mol.65.1.2 1883:tmedweb.tulane.edu 814:2019-07-26 at the 643: 633:Silent antagonists 609: 499:is an antidote to 491:is an antidote to 340: 285: 33: 3897: 3896: 3893: 3892: 3854: 3853: 3682: 3681: 3602: 3601: 3372:Enzyme inhibition 3195: 3194: 3191: 3190: 3151: 3150: 3048:Photopharmacology 3043: 3042: 3016: 3015: 2989: 2988: 2953: 2952: 2916: 2915: 2909:Electrophysiology 2899:Neuropharmacology 2854: 2853: 2804: 2803: 2740: 2739: 2727:Therapeutic index 2679: 2678: 2624: 2623: 2573: 2572: 2502: 2501: 2457: 2456: 2362:Media related to 1954:Neuropharmacology 1832:Neuropharmacology 1776:978-0-7817-8355-2 1672:10.1124/pr.55.4.4 1364:978-0-7020-8060-9 919:(Subscription or 675:μ-opioid receptor 457: 456: 357:Schild regression 175:nuclear receptors 3929: 3922:Pharmacodynamics 3871:Enzyme cofactors 3790:Opioid modulator 3747:Cannabinoidergic 3613: 3419: 3406: 3360: 3222: 3215: 3208: 3199: 3153: 3113: 3093:Polypharmacology 3018: 2991: 2981:Pharmacogenomics 2976:Pharmacogenetics 2955: 2918: 2879: 2806: 2776:Rate of infusion 2751: 2746:Pharmacokinetics 2681: 2626: 2575: 2537: 2532:Pharmacodynamics 2512:Neurotransmitter 2494:Enzyme inhibitor 2459: 2414: 2394: 2387: 2380: 2371: 2361: 2345: 2344: 2334: 2325:(33): 31279–84. 2310: 2304: 2303: 2267: 2261: 2260: 2224: 2218: 2217: 2189: 2183: 2182: 2172: 2148: 2142: 2141: 2113: 2107: 2106: 2078: 2072: 2071: 2051: 2045: 2035: 2029: 2028: 1992: 1986: 1985: 1948: 1942: 1941: 1931: 1899: 1893: 1892: 1890: 1889: 1875: 1866: 1865: 1855: 1823: 1817: 1807: 1801: 1800: 1794: 1786: 1784: 1783: 1760: 1749: 1746: 1740: 1739: 1703: 1692: 1691: 1657: 1648: 1633: 1632: 1615:(23): 3099–108. 1604: 1598: 1597: 1587: 1555: 1549: 1548: 1520: 1514: 1513: 1503: 1471: 1465: 1464: 1428: 1417: 1416: 1388: 1377: 1376: 1350: 1339: 1338: 1294: 1285: 1284: 1266: 1242: 1236: 1234: 1224: 1192: 1181: 1180: 1160: 1154: 1153: 1143: 1111: 1105: 1104: 1076: 1070: 1069: 1041: 1035: 1034: 998: 989: 988: 952: 946: 936: 925: 924: 916: 904: 897: 891: 890: 888: 886: 875: 869: 868: 832: 826: 805: 779:Enzyme inhibitor 739:Phenoxybenzamine 689:Inverse agonists 650:Partial agonists 586:phenoxybenzamine 562:receptor reserve 524:receptor protein 452: 449: 430: 422: 301:partial agonists 297:inverse agonists 270:Pharmacodynamics 264:Pharmacodynamics 127:("against") and 3939: 3938: 3932: 3931: 3930: 3928: 3927: 3926: 3902: 3901: 3898: 3889: 3850: 3840: 3809: 3776: 3741: 3678: 3640: 3598: 3587: 3561: 3556: 3548: 3540: 3514: 3485: 3399: 3390: 3375: 3351: 3297:Inverse agonist 3287:Partial agonist 3231: 3226: 3196: 3187: 3147: 3133:Drug resistance 3111: 3067: 3039: 3012: 3008:Neurotoxicology 2985: 2949: 2912: 2874: 2868: 2850: 2800: 2796:Bioavailability 2781:Onset of action 2736: 2675: 2620: 2569: 2526: 2498: 2489:Inverse agonist 2453: 2439:Partial agonist 2403: 2398: 2354: 2349: 2348: 2312: 2311: 2307: 2269: 2268: 2264: 2226: 2225: 2221: 2191: 2190: 2186: 2150: 2149: 2145: 2115: 2114: 2110: 2080: 2079: 2075: 2053: 2052: 2048: 2036: 2032: 1994: 1993: 1989: 1950: 1949: 1945: 1901: 1900: 1896: 1887: 1885: 1877: 1876: 1869: 1825: 1824: 1820: 1808: 1804: 1787: 1781: 1779: 1777: 1762: 1761: 1752: 1747: 1743: 1705: 1704: 1695: 1655: 1650: 1649: 1636: 1606: 1605: 1601: 1557: 1556: 1552: 1522: 1521: 1517: 1473: 1472: 1468: 1445:10.1038/nrd1500 1430: 1429: 1420: 1390: 1389: 1380: 1365: 1352: 1351: 1342: 1296: 1295: 1288: 1244: 1243: 1239: 1194: 1193: 1184: 1162: 1161: 1157: 1126:(12): 1663–70. 1113: 1112: 1108: 1078: 1077: 1073: 1043: 1042: 1038: 1000: 999: 992: 963:(17): 2003–13. 954: 953: 949: 937: 928: 918: 899: 898: 894: 884: 882: 877: 876: 872: 834: 833: 829: 816:Wayback Machine 806: 802: 797: 775: 723: 714: 695:inverse agonist 691: 658: 656:Partial agonist 652: 635: 614: 582:mGluR1 receptor 542: 540:Non-competitive 501:benzodiazepines 477:opioid overdose 453: 447: 444: 437:needs expansion 431: 420: 414: 409: 403: 392: 388: 384: 380: 375: 371: 366: 354: 345: 329: 325: 320: 277: 272: 266: 248:receptor theory 232: 143: 137: 119:ἀνταγωνιστής – 113: 104:allosteric site 96:inverse agonist 17: 12: 11: 5: 3937: 3936: 3933: 3925: 3924: 3919: 3914: 3904: 3903: 3895: 3894: 3891: 3890: 3888: 3887: 3875: 3862: 3860: 3856: 3855: 3852: 3851: 3849: 3848: 3843: 3838: 3834: 3829: 3824: 3817: 3815: 3811: 3810: 3808: 3807: 3802: 3797: 3792: 3786: 3784: 3778: 3777: 3775: 3774: 3768: 3762: 3757: 3751: 3749: 3743: 3742: 3740: 3739: 3733: 3724: 3715: 3714: 3713: 3702: 3692: 3690: 3684: 3683: 3680: 3679: 3677: 3676: 3671: 3661: 3650: 3648: 3642: 3641: 3639: 3638: 3632: 3627: 3621: 3619: 3610: 3604: 3603: 3600: 3599: 3597: 3596: 3590: 3585: 3577: 3571: 3569: 3563: 3562: 3560: 3559: 3554: 3550: 3546: 3542: 3538: 3530: 3524: 3522: 3516: 3515: 3513: 3512: 3506: 3501: 3495: 3493: 3487: 3486: 3484: 3483: 3477: 3471: 3465: 3452: 3446: 3437: 3427: 3425: 3416: 3403: 3392: 3391: 3385: 3383: 3377: 3376: 3368: 3366: 3357: 3353: 3352: 3350: 3349: 3344: 3337: 3336: 3330: 3324: 3312: 3311: 3305: 3299: 3294: 3289: 3284: 3273: 3272: 3267: 3256: 3255: 3250: 3239: 3237: 3233: 3232: 3227: 3225: 3224: 3217: 3210: 3202: 3193: 3192: 3189: 3188: 3186: 3185: 3180: 3175: 3173:Bacteriostatic 3170: 3165: 3159: 3157: 3149: 3148: 3146: 3145: 3140: 3135: 3130: 3125: 3123:Drug tolerance 3119: 3117: 3110: 3105: 3103:Lists of drugs 3100: 3095: 3090: 3085: 3080: 3075: 3073: 3069: 3068: 3066: 3065: 3060: 3055: 3050: 3044: 3041: 3040: 3038: 3037: 3032: 3026: 3024: 3022:Drug discovery 3014: 3013: 3011: 3010: 3005: 2999: 2997: 2987: 2986: 2984: 2983: 2978: 2973: 2967: 2965: 2951: 2950: 2948: 2947: 2942: 2937: 2932: 2926: 2924: 2914: 2913: 2911: 2906: 2901: 2896: 2891: 2889: 2876: 2870: 2869: 2867: 2866: 2864:Bioequivalence 2861: 2855: 2852: 2851: 2849: 2848: 2838: 2833: 2828: 2823: 2812: 2810: 2802: 2801: 2799: 2798: 2793: 2788: 2783: 2778: 2773: 2763: 2757: 2755: 2748: 2742: 2741: 2738: 2737: 2735: 2734: 2729: 2724: 2698: 2693: 2687: 2685: 2677: 2676: 2674: 2673: 2658: 2653: 2648: 2643: 2638: 2632: 2630: 2622: 2621: 2619: 2618: 2608: 2606:Adverse effect 2603: 2598: 2593: 2581: 2579: 2571: 2570: 2568: 2563: 2558: 2553: 2551:Mode of action 2548: 2543: 2541: 2534: 2528: 2527: 2525: 2524: 2519: 2514: 2509: 2503: 2500: 2499: 2497: 2496: 2491: 2486: 2481: 2476: 2471: 2465: 2463: 2455: 2454: 2452: 2451: 2446: 2441: 2436: 2431: 2426: 2420: 2418: 2411: 2405: 2404: 2399: 2397: 2396: 2389: 2382: 2374: 2368: 2367: 2353: 2352:External links 2350: 2347: 2346: 2305: 2262: 2219: 2184: 2143: 2108: 2073: 2046: 2030: 1987: 1960:(6): 699–723. 1943: 1894: 1867: 1818: 1802: 1775: 1750: 1741: 1693: 1666:(4): 597–606. 1634: 1599: 1550: 1531:(12): 608–14. 1515: 1466: 1418: 1399:(6): 397–414. 1378: 1363: 1340: 1286: 1237: 1182: 1155: 1106: 1087:(5–6): 261–8. 1071: 1036: 1015:10.1038/nrd746 1009:(3): 198–210. 990: 947: 926: 892: 870: 849:10.1038/nrd892 827: 799: 798: 796: 793: 792: 791: 786: 781: 774: 771: 722: 719: 712: 704:Antihistamines 690: 687: 654:Main article: 651: 648: 634: 631: 613: 610: 590:covalent bonds 541: 538: 520:insurmountable 455: 454: 434: 432: 425: 413: 410: 402: 399: 390: 386: 382: 378: 373: 369: 364: 352: 344: 341: 327: 323: 318: 276: 273: 268:Main article: 265: 262: 230: 139:Main article: 136: 133: 112: 109: 64:alpha blockers 39:is a type of 15: 13: 10: 9: 6: 4: 3: 2: 3935: 3934: 3923: 3920: 3918: 3915: 3913: 3910: 3909: 3907: 3900: 3885: 3884: 3879: 3876: 3873: 3872: 3867: 3864: 3863: 3861: 3859:Miscellaneous 3857: 3847: 3844: 3842: 3835: 3833: 3830: 3828: 3825: 3822: 3819: 3818: 3816: 3812: 3806: 3803: 3801: 3798: 3796: 3793: 3791: 3788: 3787: 3785: 3783: 3779: 3772: 3769: 3766: 3763: 3761: 3758: 3756: 3753: 3752: 3750: 3748: 3744: 3737: 3734: 3732: 3728: 3725: 3723: 3719: 3716: 3712: 3709: 3708: 3706: 3703: 3701: 3697: 3694: 3693: 3691: 3689: 3685: 3675: 3672: 3669: 3665: 3662: 3659: 3655: 3652: 3651: 3649: 3647: 3646:Glutamatergic 3643: 3636: 3633: 3631: 3628: 3626: 3623: 3622: 3620: 3618: 3614: 3611: 3609: 3605: 3594: 3591: 3588: 3581: 3578: 3576: 3573: 3572: 3570: 3568: 3564: 3557: 3551: 3549: 3543: 3541: 3534: 3531: 3529: 3526: 3525: 3523: 3521: 3520:Histaminergic 3517: 3510: 3507: 3505: 3502: 3500: 3497: 3496: 3494: 3492: 3488: 3481: 3478: 3475: 3472: 3469: 3466: 3464: 3460: 3456: 3453: 3450: 3447: 3445: 3441: 3438: 3436: 3432: 3429: 3428: 3426: 3424: 3420: 3417: 3415: 3411: 3407: 3404: 3402: 3397: 3393: 3389: 3384: 3382: 3378: 3374: 3373: 3367: 3365: 3361: 3358: 3354: 3348: 3345: 3343: 3339: 3338: 3334: 3331: 3328: 3325: 3322: 3318: 3314: 3313: 3309: 3306: 3303: 3300: 3298: 3295: 3293: 3290: 3288: 3285: 3283: 3279: 3275: 3274: 3271: 3268: 3266: 3262: 3258: 3257: 3254: 3251: 3249: 3245: 3241: 3240: 3238: 3234: 3230: 3223: 3218: 3216: 3211: 3209: 3204: 3203: 3200: 3184: 3181: 3179: 3176: 3174: 3171: 3169: 3166: 3164: 3161: 3160: 3158: 3154: 3144: 3141: 3139: 3136: 3134: 3131: 3129: 3128:Tachyphylaxis 3126: 3124: 3121: 3120: 3118: 3114: 3109: 3106: 3104: 3101: 3099: 3096: 3094: 3091: 3089: 3086: 3084: 3081: 3079: 3076: 3074: 3070: 3064: 3061: 3059: 3056: 3054: 3051: 3049: 3046: 3045: 3036: 3033: 3031: 3028: 3027: 3025: 3023: 3019: 3009: 3006: 3004: 3001: 3000: 2998: 2996: 2992: 2982: 2979: 2977: 2974: 2972: 2969: 2968: 2966: 2964: 2960: 2956: 2946: 2943: 2941: 2938: 2936: 2933: 2931: 2928: 2927: 2925: 2923: 2919: 2910: 2907: 2905: 2902: 2900: 2897: 2895: 2892: 2890: 2888: 2884: 2880: 2877: 2871: 2865: 2862: 2860: 2857: 2856: 2846: 2842: 2839: 2837: 2834: 2832: 2829: 2827: 2824: 2821: 2817: 2814: 2813: 2811: 2807: 2797: 2794: 2792: 2789: 2787: 2784: 2782: 2779: 2777: 2774: 2771: 2767: 2764: 2762: 2759: 2758: 2756: 2752: 2749: 2747: 2743: 2733: 2730: 2728: 2725: 2722: 2718: 2714: 2710: 2706: 2702: 2699: 2697: 2694: 2692: 2689: 2688: 2686: 2682: 2671: 2667: 2663: 2659: 2657: 2654: 2652: 2649: 2647: 2644: 2642: 2639: 2637: 2634: 2633: 2631: 2627: 2616: 2615:Neurotoxicity 2612: 2609: 2607: 2604: 2602: 2599: 2597: 2594: 2591: 2587: 2584:Selectivity ( 2583: 2582: 2580: 2576: 2567: 2564: 2562: 2559: 2557: 2554: 2552: 2549: 2547: 2544: 2542: 2538: 2535: 2533: 2529: 2523: 2522:Pharmacophore 2520: 2518: 2515: 2513: 2510: 2508: 2505: 2504: 2495: 2492: 2490: 2487: 2485: 2482: 2480: 2477: 2475: 2472: 2470: 2467: 2466: 2464: 2460: 2450: 2447: 2445: 2442: 2440: 2437: 2435: 2432: 2430: 2427: 2425: 2422: 2421: 2419: 2415: 2412: 2410: 2406: 2402: 2395: 2390: 2388: 2383: 2381: 2376: 2375: 2372: 2365: 2360: 2356: 2355: 2351: 2342: 2338: 2333: 2328: 2324: 2320: 2316: 2309: 2306: 2301: 2297: 2293: 2289: 2285: 2281: 2278:(4): 489–98. 2277: 2273: 2266: 2263: 2258: 2254: 2250: 2246: 2242: 2238: 2234: 2230: 2223: 2220: 2215: 2211: 2207: 2203: 2199: 2195: 2188: 2185: 2180: 2176: 2171: 2166: 2162: 2158: 2154: 2147: 2144: 2139: 2135: 2131: 2127: 2123: 2119: 2112: 2109: 2104: 2100: 2096: 2092: 2089:(8): 438–46. 2088: 2084: 2077: 2074: 2069: 2065: 2061: 2057: 2050: 2047: 2044: 2043:0-632-05605-3 2040: 2034: 2031: 2026: 2022: 2018: 2014: 2010: 2006: 2003:(12): 41–48. 2002: 1998: 1991: 1988: 1983: 1979: 1975: 1971: 1967: 1963: 1959: 1955: 1947: 1944: 1939: 1935: 1930: 1925: 1921: 1917: 1914:(1): 101–10. 1913: 1909: 1905: 1898: 1895: 1884: 1880: 1874: 1872: 1868: 1863: 1859: 1854: 1849: 1845: 1841: 1838:(3): 744–54. 1837: 1833: 1829: 1822: 1819: 1816: 1815:0-7817-8355-0 1812: 1806: 1803: 1798: 1792: 1778: 1772: 1768: 1767: 1759: 1757: 1755: 1751: 1745: 1742: 1737: 1733: 1729: 1725: 1721: 1717: 1714:(4): 263–72. 1713: 1709: 1702: 1700: 1698: 1694: 1689: 1685: 1681: 1677: 1673: 1669: 1665: 1661: 1654: 1647: 1645: 1643: 1641: 1639: 1635: 1630: 1626: 1622: 1618: 1614: 1610: 1603: 1600: 1595: 1591: 1586: 1581: 1577: 1573: 1569: 1565: 1561: 1554: 1551: 1546: 1542: 1538: 1534: 1530: 1526: 1519: 1516: 1511: 1507: 1502: 1497: 1493: 1489: 1486:(5): 541–51. 1485: 1481: 1477: 1470: 1467: 1462: 1458: 1454: 1450: 1446: 1442: 1438: 1434: 1427: 1425: 1423: 1419: 1414: 1410: 1406: 1402: 1398: 1394: 1387: 1385: 1383: 1379: 1374: 1370: 1366: 1360: 1356: 1349: 1347: 1345: 1341: 1336: 1332: 1328: 1324: 1320: 1316: 1312: 1308: 1304: 1300: 1293: 1291: 1287: 1282: 1278: 1274: 1270: 1265: 1260: 1256: 1252: 1248: 1241: 1238: 1232: 1228: 1223: 1218: 1214: 1210: 1206: 1202: 1198: 1191: 1189: 1187: 1183: 1178: 1174: 1170: 1166: 1159: 1156: 1151: 1147: 1142: 1137: 1133: 1129: 1125: 1121: 1117: 1110: 1107: 1102: 1098: 1094: 1090: 1086: 1082: 1075: 1072: 1067: 1063: 1059: 1055: 1052:(3): 287–96. 1051: 1047: 1040: 1037: 1032: 1028: 1024: 1020: 1016: 1012: 1008: 1004: 997: 995: 991: 986: 982: 978: 974: 970: 966: 962: 958: 951: 948: 945: 944:0-12-370599-1 941: 935: 933: 931: 927: 922: 914: 910: 909: 903: 896: 893: 880: 874: 871: 866: 862: 858: 854: 850: 846: 843:(9): 727–30. 842: 838: 831: 828: 824: 822: 821:GlaxoWellcome 817: 813: 810: 804: 801: 794: 790: 787: 785: 782: 780: 777: 776: 772: 770: 768: 762: 759: 758:noradrenaline 755: 752:, preventing 751: 748: 744: 743:alpha blocker 740: 735: 730: 728: 721:Reversibility 720: 718: 716: 709: 705: 700: 696: 688: 686: 684: 680: 676: 672: 671:Buprenorphine 668: 664: 657: 649: 647: 639: 632: 630: 628: 627:NMDA receptor 624: 620: 612:Uncompetitive 611: 605: 601: 599: 595: 591: 587: 583: 579: 578:Cyclothiazide 574: 569: 565: 563: 559: 555: 551: 547: 539: 537: 535: 534:ubiquitinated 530: 525: 521: 517: 513: 509: 504: 502: 498: 494: 490: 487:. Similarly, 486: 482: 478: 474: 469: 466: 462: 451: 448:November 2017 442: 438: 435:This section 433: 429: 424: 423: 419: 411: 408: 400: 398: 396: 362: 358: 350: 342: 336: 332: 321: 314: 310: 306: 302: 298: 294: 290: 281: 274: 271: 263: 261: 259: 254: 249: 244: 242: 238: 234: 226: 222: 218: 213: 209: 204: 199: 197: 193: 188: 184: 180: 179:mitochondrion 176: 172: 168: 164: 160: 156: 152: 148: 142: 134: 132: 130: 126: 122: 118: 110: 108: 105: 101: 97: 93: 89: 85: 81: 77: 73: 69: 68:beta blockers 65: 61: 57: 53: 49: 45: 42: 38: 30: 26: 21: 3899: 3881: 3869: 3567:Serotonergic 3491:Dopaminergic 3370: 3291: 3098:Chemotherapy 3058:Cell biology 2959:Biochemistry 2883:Neuroscience 2831:Distribution 2761:Loading dose 2468: 2444:Superagonist 2401:Pharmacology 2322: 2318: 2308: 2275: 2271: 2265: 2232: 2228: 2222: 2200:(1–3): 1–9. 2197: 2193: 2187: 2163:(1): 49–58. 2160: 2156: 2146: 2124:(4): 151–3. 2121: 2117: 2111: 2086: 2082: 2076: 2062:(7): 344–5. 2059: 2055: 2049: 2033: 2000: 1996: 1990: 1957: 1953: 1946: 1911: 1907: 1897: 1886:. Retrieved 1882: 1835: 1831: 1821: 1805: 1780:. Retrieved 1765: 1744: 1711: 1707: 1663: 1659: 1612: 1608: 1602: 1567: 1563: 1553: 1528: 1524: 1518: 1483: 1479: 1469: 1439:(9): 801–8. 1436: 1432: 1396: 1392: 1354: 1310: 1306: 1257:(1): 45–56. 1254: 1250: 1240: 1204: 1200: 1171:(1): 32–49. 1168: 1164: 1158: 1123: 1119: 1109: 1084: 1080: 1074: 1049: 1045: 1039: 1006: 1002: 960: 956: 950: 906: 902:"antagonist" 895: 883:. 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Index


agonist
receptor
receptor
ligand
drug
receptor
agonist
alpha blockers
beta blockers
calcium channel blockers
pharmacology
affinity
efficacy
agonist
inverse agonist
active site
allosteric site
Greek
Receptor (biochemistry)
receptors
protein
ligand
hormone
drug
cell surface receptors
intracellular receptors
nuclear receptors
mitochondrion
non-covalent interactions

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