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Agonist

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These differences show that agonists have unique mechanisms of action depending on the receptor activated and the response needed. The goal and process remains generally consistent however, with the primary mechanism of action requiring the binding of the agonist and the subsequent changes in
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As mentioned above, agonists have the potential to bind in different locations and in different ways depending on the type of agonist and the type of receptor. The process of binding is unique to the receptor-agonist relationship, but binding induces a conformational change and activates the
532:. In general, the narrower this margin, the more likely it is that the drug will produce unwanted effects. The therapeutic index emphasizes the importance of the margin of safety, as distinct from the potency, in determining the usefulness of a drug. 692:
DeWire SM, Yamashita DS, Rominger DH, Liu G, Cowan CL, Graczyk TM, et al. (March 2013). "A G protein-biased ligand at the μ-opioid receptor is potently analgesic with reduced gastrointestinal and respiratory dysfunction compared with morphine".
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When a drug is used therapeutically, it is important to understand the margin of safety that exists between the dose needed for the desired effect and the dose that produces unwanted and possibly dangerous side-effects (measured by the
428:, in this case calcium. An aspect demonstrated by the NMDA receptor is that the mechanism or response of agonists can be blocked by a variety of chemical and biological factors. NMDA receptors specifically are blocked by a 412:
is an example of an alternate mechanism of action, as the NMDA receptor requires co-agonists for activation. Rather than simply requiring a single specific agonist, the NMDA receptor requires both the
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causes the conformational changes that propagate a signal into the cell. The conformational changes are the primary effect of the agonist, and are related to the agonist's binding affinity and agonist
197:. However, a drug can act as a full agonist in some tissues and as a partial agonist in other tissues, depending upon the relative numbers of receptors and differences in receptor coupling. 397:. Other agonists that bind to this receptor will fall under one of the different categories of agonist mentioned above based on their specific binding affinity and efficacy. 489:
can be measured for a given agonist by determining the concentration of agonist needed to elicit half of the maximum biological response of the agonist. The EC
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bind to and activate a receptor with the maximum response that an agonist can elicit at the receptor. One example of a drug that can act as a full agonist is
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for a particular receptor is a compound naturally produced by the body that binds to and activates that receptor. For example, the endogenous agonist for
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is an agent that binds to the same receptor binding-site as an agonist for that receptor and inhibits the constitutive activity of the receptor.
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value, the greater the potency of the agonist, the lower the concentration of drug that is required to elicit the maximum biological response.
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is a μ-opioid receptor agonist that has been described to be functionally selective towards G protein and away from β-arrestin2 pathways.
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De Mey JGR, Compeer MG, Meens MJ (2009). "Endothelin-1, an Endogenous Irreversible Agonist in Search of an Allosteric Inhibitor".
1955: 424:. These co-agonists are both required to induce the conformational change needed for the NMDA receptor to allow flow through the 1895: 1388: 1423: 1950: 1646: 1557: 280:
exert the opposite pharmacological effect of a receptor agonist, not merely an absence of the agonist effect as seen with an
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conformation to cause the desired response at the receptor. This response as discussed above can vary from allowing flow of
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dependence for this reason, as they produce milder effects on the opioid receptor with lower dependence and abuse potential.
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antagonists at the same receptor, depending on effector pathways or tissue type. Terms that describe this phenomenon are "
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for the target receptor. It might be argued that the endogenous agonist is simply a partial agonist in that tissue.
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is a term used by some to identify a compound that is capable of producing a greater response than the
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Urban JD, Clarke WP, von Zastrow M, Nichols DE, Kobilka B, Weinstein H, et al. (January 2007).
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is a type of agonist that binds permanently to a receptor through the formation of covalent bonds.
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Dose response curves of a full agonist, partial agonist, neutral antagonist, and inverse agonist
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is a substance that creates the same bodily responses but does not bind to the same receptor.
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is an agent that binds to a receptor without affecting the same signal transduction pathway.
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at the receptor relative to a full agonist, even at maximal receptor occupancy. Agents like
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Rosenbaum DM, Zhang C, Lyons JA, Holl R, Aragao D, Arlow DH, et al. (January 2011).
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Goodman and Gilman's Manual of Pharmacology and Therapeutics. (11th edition, 2008). p14.
1012: 652: 514:, the dose that produces toxicity in 50% of individuals). This relationship, termed the 1910: 1890: 1809: 1651: 1393: 1338: 1139: 1115:"Agonist binding, agonist affinity and agonist efficacy at G protein-coupled receptors" 1114: 1087: 1062: 1029: 996: 961: 936: 844:"A New Molecular Mechanism To Engineer Protean Agonism at a G Protein-Coupled Receptor" 669: 636: 449: 433: 347: 321:
New findings that broaden the conventional definition of pharmacology demonstrate that
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whose activation causes the cell to modify what it is currently doing. In contrast, an
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Zhu S, Stein RA, Yoshioka C, Lee CH, Goehring A, Mchaourab HS, Gouaux E (April 2016).
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De Min A, Matera C, Bock A, Holze J, Kloeckner J, Muth M, et al. (April 2017).
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Kruse AC, Ring AM, Manglik A, Hu J, Hu K, Eitel K, et al. (December 2013).
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when the agonist is bound. Two examples that demonstrate this process are the
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receptor. This conformational change is often the result of small changes in
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Potency is the amount of agonist needed to elicit a desired response. The
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Simplified depiction of the mechanism of an agonist binding to a GPCR.
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works with other co-agonists to produce the desired effect together.
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value is useful for comparing the potency of drugs with similar
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producing physiologically similar effects. The smaller the EC
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Chemical which binds to and activates a biochemical receptor
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Simplified depiction of co-agonists activating a receptor.
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The Journal of Pharmacology and Experimental Therapeutics
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The Journal of Pharmacology and Experimental Therapeutics
1063:"Mechanism of NMDA Receptor Inhibition and Activation" 1943: 1903: 1859: 1808: 1781: 1745: 1708: 1669: 1660: 1596: 1541: 1532: 1471: 1416: 1365: 1327: 1318: 1249: 1204: 1195: 231:is selective for a specific type of receptor. E.g. 81:causes an action opposite to that of the agonist. 100:(agōn), contest, combat; exertion, struggle < 38:For a primary fictional character in a work, see 284:. An example is the cannabinoid inverse agonist 66:to produce a biological response. Receptors are 96:(agōnistēs), contestant; champion; rival < 31:For other uses of "Agonist" or "Agonism", see 1173: 8: 235:is a selective agonist for serotonin 5-HT1A. 104:(agō), I lead, lead towards, conduct; drive 77:blocks the action of the agonist, while an 1940: 1900: 1805: 1778: 1742: 1705: 1666: 1593: 1538: 1468: 1413: 1362: 1324: 1246: 1201: 1180: 1166: 1158: 477:of an agonist is inversely related to its 1138: 1086: 1028: 960: 900: 859: 763: 753: 668: 432:ion unless the cell is also experiencing 135:), resulting in a biological response. A 208:activation requires the binding of both 49: 883:Smith CL, O'Malley BW (February 2004). 592: 464:Efficacy spectrum of receptor ligands. 1108: 1106: 1056: 1054: 1052: 1050: 1048: 990: 988: 986: 984: 982: 980: 7: 930: 928: 926: 924: 922: 920: 479:half maximal effective concentration 220:can also act as a co-agonist at the 448:and transmitting a signal into the 325:can concurrently behave as agonist 1966:Minimum bactericidal concentration 25: 552:Excitatory postsynaptic potential 375:muscarinic acetylcholine receptor 356:muscarinic acetylcholine receptor 155:, and the endogenous agonist for 1956:Minimum inhibitory concentration 937:"Agonist-activated ion channels" 1896:WHO list of essential medicines 1389:Non-specific effect of vaccines 1119:British Journal of Pharmacology 941:British Journal of Pharmacology 362:and their respective agonists. 62:is a chemical that activates a 1951:Antimicrobial pharmacodynamics 185:, which mimics the actions of 1: 1876:Functional analog (chemistry) 335:selective receptor modulators 173:, which mimics the action of 1429:Hill equation (biochemistry) 935:Colquhoun D (January 2006). 115:can be activated by either 2032: 1944:Antimicrobial pharmacology 1424:Dose–response relationship 1354:Desensitization (medicine) 1079:10.1016/j.cell.2016.03.028 518:, is defined as the ratio 379:G protein-coupled receptor 216:and D-serine co-agonists. 29: 1866:Coinduction (anesthetics) 1113:Strange PG (April 2008). 333:", "protean agonism", or 1931:Multiple drug resistance 1904:Tolerance and resistance 1272:Physiological antagonist 736:Kenakin T (March 2001). 572:Mixed agonist/antagonist 33:Agonist (disambiguation) 1682:Neuropsychopharmacology 1444:Cheng-Prussoff Equation 1439:Del Castillo Katz model 1366:Other effects of ligand 1349:Receptor (biochemistry) 1267:Irreversible antagonist 813:10.1124/jpet.106.104463 707:10.1124/jpet.112.201616 1818:Classical pharmacology 1579:Plasma protein binding 1554:Volume of distribution 1262:Competitive antagonist 1131:10.1038/sj.bjp.0707672 953:10.1038/sj.bjp.0706502 861:10.1124/mol.116.107276 848:Molecular Pharmacology 557:Functional selectivity 465: 405: 389:. The binding of this 370: 331:functional selectivity 195:central nervous system 55: 1926:Antibiotic resistance 1718:Clinical pharmacology 1237:Physiological agonist 1197:Ligand (biochemistry) 765:10.1096/fj.00-0438rev 463: 403: 368: 181:. Another example is 137:physiological agonist 53: 1823:Reverse pharmacology 1733:Pharmacoepidemiology 1574:Biological half-life 1454:Ligand binding assay 1328:Activity at receptor 1222:Irreversible agonist 902:10.1210/er.2003-0023 542:Allosteric modulator 418:N-methyl-D-aspartate 304:irreversible agonist 2016:Medicinal chemistry 1996:Medical terminology 1871:Combination therapy 1759:Pharmacoinformatics 1728:Medicinal chemistry 1334:Mechanism of action 1021:10.1038/nature12735 1013:2013Natur.504..101K 661:10.1038/nature09665 653:2011Natur.469..236R 577:Receptor antagonist 547:Dose response curve 414:endogenous agonists 341:Mechanism of action 149:serotonin receptors 1841:Immunopharmacology 1791:Pharmacotoxicology 1692:Psychopharmacology 1484:Intrinsic activity 1384:Pleiotropy (drugs) 1305:Agonist-antagonist 1217:Endogenous agonist 618:Mol Cell Pharmacol 562:Intrinsic activity 466: 406: 383:endogenous agonist 371: 297:endogenous agonist 265:are used to treat 191:μ-opioid receptors 157:dopamine receptors 145:endogenous agonist 131:agonists (such as 119:agonists (such as 56: 2011:Receptor agonists 1983: 1982: 1979: 1978: 1939: 1938: 1836:Photopharmacology 1831: 1830: 1804: 1803: 1777: 1776: 1741: 1740: 1704: 1703: 1697:Electrophysiology 1687:Neuropharmacology 1642: 1641: 1592: 1591: 1528: 1527: 1515:Therapeutic index 1467: 1466: 1412: 1411: 1361: 1360: 1290: 1289: 1245: 1244: 1007:(7478): 101–106. 889:Endocrine Reviews 647:(7329): 236–240. 516:therapeutic index 505:Therapeutic index 229:selective agonist 179:β adrenoreceptors 125:neurotransmitters 108:Types of agonists 16:(Redirected from 2023: 2001:Pharmacodynamics 1941: 1901: 1881:Polypharmacology 1806: 1779: 1769:Pharmacogenomics 1764:Pharmacogenetics 1743: 1706: 1667: 1594: 1564:Rate of infusion 1539: 1534:Pharmacokinetics 1469: 1414: 1363: 1325: 1320:Pharmacodynamics 1300:Neurotransmitter 1282:Enzyme inhibitor 1247: 1202: 1182: 1175: 1168: 1159: 1153: 1152: 1142: 1125:(7): 1353–1363. 1110: 1101: 1100: 1090: 1058: 1043: 1042: 1032: 992: 975: 974: 964: 932: 915: 914: 904: 880: 874: 873: 863: 839: 833: 832: 792: 786: 785: 767: 757: 733: 727: 726: 689: 683: 682: 672: 632: 626: 625: 613: 607: 597: 444:to activating a 391:neurotransmitter 278:Inverse agonists 239:Partial agonists 47: 36: 21: 2031: 2030: 2026: 2025: 2024: 2022: 2021: 2020: 1986: 1985: 1984: 1975: 1935: 1921:Drug resistance 1899: 1855: 1827: 1800: 1796:Neurotoxicology 1773: 1737: 1700: 1662: 1656: 1638: 1588: 1584:Bioavailability 1569:Onset of action 1524: 1463: 1408: 1357: 1314: 1286: 1277:Inverse agonist 1241: 1227:Partial agonist 1191: 1186: 1156: 1112: 1111: 1104: 1060: 1059: 1046: 994: 993: 978: 947:(S1): S17–S26. 934: 933: 918: 882: 881: 877: 841: 840: 836: 794: 793: 789: 755:10.1.1.334.8525 735: 734: 730: 691: 690: 686: 634: 633: 629: 615: 614: 610: 598: 594: 590: 582:Receptor theory 567:Inverse agonist 538: 530: 523: 513: 507: 500: 492: 488: 485:) value. The EC 484: 471: 458: 352:protein folding 343: 274:inverse agonist 193:throughout the 110: 87: 79:inverse agonist 48: 37: 30: 28: 23: 22: 15: 12: 11: 5: 2029: 2027: 2019: 2018: 2013: 2008: 2003: 1998: 1988: 1987: 1981: 1980: 1977: 1976: 1974: 1973: 1968: 1963: 1961:Bacteriostatic 1958: 1953: 1947: 1945: 1937: 1936: 1934: 1933: 1928: 1923: 1918: 1913: 1911:Drug tolerance 1907: 1905: 1898: 1893: 1891:Lists of drugs 1888: 1883: 1878: 1873: 1868: 1863: 1861: 1857: 1856: 1854: 1853: 1848: 1843: 1838: 1832: 1829: 1828: 1826: 1825: 1820: 1814: 1812: 1810:Drug discovery 1802: 1801: 1799: 1798: 1793: 1787: 1785: 1775: 1774: 1772: 1771: 1766: 1761: 1755: 1753: 1739: 1738: 1736: 1735: 1730: 1725: 1720: 1714: 1712: 1702: 1701: 1699: 1694: 1689: 1684: 1679: 1677: 1664: 1658: 1657: 1655: 1654: 1652:Bioequivalence 1649: 1643: 1640: 1639: 1637: 1636: 1626: 1621: 1616: 1611: 1600: 1598: 1590: 1589: 1587: 1586: 1581: 1576: 1571: 1566: 1561: 1551: 1545: 1543: 1536: 1530: 1529: 1526: 1525: 1523: 1522: 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226: 223: 219: 215: 211: 207: 206:NMDA receptor 203: 199: 196: 192: 188: 184: 180: 176: 172: 171:isoproterenol 168: 167:Full agonists 165: 162: 158: 154: 150: 146: 142: 141: 140: 138: 134: 130: 126: 122: 118: 114: 107: 105: 103: 99: 95: 92: 84: 82: 80: 76: 72: 69: 65: 61: 52: 45: 41: 34: 19: 1886:Chemotherapy 1846:Cell biology 1747:Biochemistry 1671:Neuroscience 1619:Distribution 1549:Loading dose 1232:Superagonist 1211: 1189:Pharmacology 1122: 1118: 1070: 1066: 1004: 1000: 944: 940: 895:(1): 45–71. 892: 888: 878: 851: 847: 837: 804: 800: 790: 745: 741: 731: 698: 694: 687: 644: 640: 630: 621: 617: 611: 595: 508: 472: 438: 407: 381:(GPCR), the 372: 344: 326: 320: 293:superagonist 255:norclozapine 247:aripiprazole 228: 222:IP3 receptor 201: 166: 111: 101: 97: 93: 88: 59: 57: 1971:Bactericide 1647:Compartment 1458:Patch clamp 1434:Schild plot 807:(1): 1–13. 426:ion channel 420:(NMDA) and 315:Oliceridine 40:Protagonist 2006:Physiology 1990:Categories 1851:Physiology 1783:Toxicology 1675:psychology 1624:Metabolism 1614:Absorption 1608:Liberation 1450:Organ bath 1378:Functional 1257:Antagonist 1250:Inhibitory 1205:Excitatory 588:References 495:efficacies 286:rimonabant 282:antagonist 202:co-agonist 187:endorphins 175:adrenaline 117:endogenous 75:antagonist 44:Antagonist 1633:Clearance 1629:Excretion 1448:Methods ( 750:CiteSeerX 430:magnesium 243:buspirone 241:(such as 233:buspirone 210:glutamate 153:serotonin 129:exogenous 113:Receptors 94:αγωνιστής 89:From the 85:Etymology 1751:genetics 1723:Pharmacy 1710:Medicine 1520:Affinity 1479:Efficacy 1417:Analysis 1399:Toxicity 1149:18223670 1097:27062927 1039:24256733 971:16402101 911:14769827 870:28167741 821:16803859 782:18260817 774:11259378 715:23300227 679:21228876 536:See also 456:Activity 395:efficacy 373:For the 259:efficacy 183:morphine 161:dopamine 121:hormones 71:proteins 68:cellular 64:receptor 1661:Related 1604:(L)ADME 1558:Initial 1542:Metrics 1489:Potency 1472:Metrics 1374:Binding 1344:Binding 1212:Agonist 1140:2437915 1088:4914038 1030:4020789 1009:Bibcode 962:1760748 723:8785003 670:3074335 649:Bibcode 475:potency 469:Potency 422:glycine 323:ligands 218:Calcium 214:glycine 60:agonist 1663:fields 1147:  1137:  1095:  1085:  1037:  1027:  1001:Nature 969:  959:  909:  868:  829:447937 827:  819:  780:  772:  752:  721:  713:  677:  667:  641:Nature 603:  348:charge 267:opiate 1860:Other 1597:LADME 825:S2CID 778:S2CID 719:S2CID 253:, or 133:drugs 127:) or 91:Greek 1749:and 1673:and 1509:TD50 1505:LD50 1501:ED50 1497:IC50 1493:EC50 1295:Drug 1145:PMID 1093:PMID 1067:Cell 1035:PMID 967:PMID 907:PMID 866:PMID 817:PMID 770:PMID 711:PMID 675:PMID 601:ISBN 450:cell 446:GPCR 442:ions 408:The 358:and 123:and 98:αγων 42:and 1606:: ( 1135:PMC 1127:doi 1123:153 1083:PMC 1075:doi 1071:165 1025:PMC 1017:doi 1005:504 957:PMC 949:doi 945:147 897:doi 856:doi 809:doi 805:320 760:doi 703:doi 699:344 665:PMC 657:doi 645:469 481:(EC 385:is 327:and 302:An 272:An 189:at 177:at 159:is 151:is 143:An 102:αγω 58:An 1992:: 1507:, 1503:, 1499:, 1495:, 1456:, 1452:, 1376:, 1143:. 1133:. 1121:. 1117:. 1105:^ 1091:. 1081:. 1069:. 1065:. 1047:^ 1033:. 1023:. 1015:. 1003:. 999:. 979:^ 965:. 955:. 943:. 939:. 919:^ 905:. 893:25 891:. 887:. 864:. 852:91 850:. 846:. 823:. 815:. 803:. 799:. 776:. 768:. 758:. 746:15 744:. 740:. 717:. 709:. 697:. 673:. 663:. 655:. 643:. 639:. 620:. 529:50 527:ED 522:50 520:TD 512:50 510:TD 499:50 491:50 487:50 483:50 452:. 436:. 416:, 337:. 309:A 291:A 249:, 245:, 227:A 212:, 200:A 1635:) 1631:( 1610:) 1560:) 1556:( 1511:) 1491:( 1460:) 1405:) 1401:( 1380:) 1181:e 1174:t 1167:v 1151:. 1129:: 1099:. 1077:: 1041:. 1019:: 1011:: 973:. 951:: 913:. 899:: 872:. 858:: 831:. 811:: 784:. 762:: 725:. 705:: 681:. 659:: 651:: 622:1 525:: 288:. 224:. 163:. 46:. 35:. 20:)

Index

Direct agonist
Agonist (disambiguation)
Protagonist
Antagonist

receptor
cellular
proteins
antagonist
inverse agonist
Greek
Receptors
endogenous
hormones
neurotransmitters
exogenous
drugs
physiological agonist
endogenous agonist
serotonin receptors
serotonin
dopamine receptors
dopamine
isoproterenol
adrenaline
β adrenoreceptors
morphine
endorphins
μ-opioid receptors
central nervous system

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