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Downregulation and upregulation

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196:, often located at the cell's surface imbedded in the plasma membrane. When such signals interact with a receptor, they effectively direct the cell to do something, such as dividing, dying, or allowing substances to be created, or to enter or exit the cell. A cell's ability to respond to a chemical message depends on the presence of receptors tuned to that message. The more receptors a cell has that are tuned to the message, the more the cell will respond to it. 280:. The internalization of the insulin molecules provides a pathway for degradation of the hormone, as well as for regulation of the number of sites that are available for binding on the cell surface. At high plasma concentrations, the number of surface receptors for insulin is gradually reduced by the accelerated rate of receptor internalization and degradation brought about by increased hormonal binding. The rate of 1888: 140: 1900: 714: 320:
levels. The near-constant increase in blood insulin levels results from an effort to match the increase in blood glucose, which will cause receptor sites on the liver cells to downregulate and decrease the number of receptors for insulin, increasing the subject's resistance by decreasing sensitivity
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Receptors are created, or expressed, from instructions in the DNA of the cell, and they can be increased, or upregulated, when the signal is weak, or decreased, or downregulated, when it is strong. Their level can also be up or down regulated by modulation of systems that degrade receptors when they
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Taken together, our data suggest that normal repair of a DNA break can occasionally cause heritable silencing of a CpG island–containing promoter by recruitment of proteins involved in silencing...This finding suggests that DNA damage may directly contribute to the large number of epigenetically
215:-induced desensitization or internalization of that receptor. This is typically seen in animal hormone receptors. Upregulation of receptors, on the other hand, can result in super-sensitized cells, especially after repeated exposure to an antagonistic drug or prolonged absence of the ligand. 1049:
Cuozzo, Concetta; Porcellini, Antonio; Angrisano, Tiziana; Morano, Annalisa; Lee, Bongyong; Pardo, Alba Di; Messina, Samantha; Iuliano, Rodolfo; Fusco, Alfredo; Santillo, Maria R; Muller, Mark T; Chiariotti, Lorenzo; Gottesman, Max E; Avvedimento, Enrico V (6 July 2007).
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and their insertion in the plasma membrane do not keep pace with their rate of destruction. Over time, this self-induced loss of target cell receptors for insulin reduces the target cell's sensitivity to the elevated hormone concentration.
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Mego, Michal; Cierna, Zuzana; Svetlovska, Daniela; Macak, Dusan; Machalekova, Katarina; Miskovska, Viera; Chovanec, Michal; Usakova, Vanda; Obertova, Jana; Babal, Pavel; Mardiak, Jozef (July 2013). "PARP expression in germ cell tumours".
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Especially among genetically vulnerable individuals, repeated exposure to a drug of abuse in adolescence or adulthood causes addiction by inducing stable downregulation or upregulation in expression of specific genes and
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Newman, Robert; Soldatenkov, Viatcheslav; Dritschilo, Anatoly; Notario, Vicente (1 May 2002). "Poly(ADP-ribose) polymerase turnover alterations do not contribute to PARP overexpression in Ewing's sarcoma cells".
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occurs in 93% of bladder cancers, 88% of stomach cancers, 74% of thyroid cancers, 40–90% of colorectal cancers, and 50% of brain cancers. Similarly, epigenetic downregulation of
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Muvarak, Nidal; Kelley, Shannon; Robert, Carine; Baer, Maria R.; Perrotti, Danilo; Gambacorti-Passerini, Carlo; Civin, Curt; Scheibner, Kara; Rassool, Feyruz V. (1 April 2015).
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in the blood trigger downregulation of the associated receptors. When insulin binds to its receptors on the surface of a cell, the hormone receptor complex undergoes
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alteration. Such an epigenetic alteration can cause expression of the RNA or protein to no longer respond to an external stimulus. This occurs, for instance, during
394:). Investigation of epigenetic down- or upregulation of repaired DNA genes as possibly central to progression of cancer has been regularly undertaken since 2000. 1466: 352:
Family-based, adoption, and twin studies have indicated that there is a strong (50%) heritable component to vulnerability to substance abuse addiction.
1092:...data support a mechanistic link between HR and DNA methylation and suggest that DNA methylation in eukaryotes marks homologous recombined segments. 192:
All living cells have the ability to receive and process signals that originate outside their membranes, which they do by means of proteins called
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is over-expressed in tyrosine kinase-activated leukemias, in neuroblastoma, in testicular and other germ cell tumors, and in Ewing's sarcoma.
1157:"Promoter hypermethylation of tumor suppressor genes correlates with tumor grade and invasiveness in patients with urothelial bladder cancer" 972: 439: 377: 831: 1491: 203:
Downregulation of receptors can also occur when receptors have been chronically exposed to an excessive amount of a ligand, either from
70:, in response to an external stimulus. The complementary process that involves increase in quantities of cellular components is called 1810: 1513: 724: 451: 1802: 1742: 881: 179: 993:"Double Strand Breaks Can Initiate Gene Silencing and SIRT1-Dependent Onset of DNA Methylation in an Exogenous Promoter CpG Island" 963:
Bernstein, C; Prasad, AR; Nfonsam, V; Bernstein, H. (2013). "Chapter 16: DNA Damage, DNA Repair and Cancer". In Chen, Clark (ed.).
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Zaliauskiene, Lolita; Kang, Sunghyun; Brouillette, Christie G.; Lebowitz, Jacob; Arani, Ramin B.; Collawn, James F. (2016).
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Newman, Erika A.; Lu, Fujia; Bashllari, Daniela; Wang, Li; Opipari, Anthony W.; Castle, Valerie P. (1 March 2015).
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is upregulated in the majority of cancers of the breast, prostate, stomach, neuroblastomas, pancreas, and lung.
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temporarily upregulate their respective receptors. The disequilibrium caused by these changes often causes
606:"Down-Regulation of Cell Surface Receptors Is Modulated by Polar Residues within the Transmembrane Domain" 119: 364:. Such downregulation or upregulation has been shown to occur in the brain's reward regions, such as the 1936: 1690: 1685: 1627: 1541: 386:
alterations due to errors during DNA repair. Such mutations and epigenetic alterations can give rise to
285: 1790: 1647: 1496: 416: 341: 309: 1659: 1654: 1632: 1578: 742:"Alterations of insulin signaling in type 2 diabetes: A review of the current evidence from humans" 481: 223: 1328: 1284: 843: 337: 330: 204: 193: 123: 59: 565:"On the mechanism of ligand-induced down-regulation of insulin receptor level in the liver cell" 88:, which reduces the cell's sensitivity to the molecule. This is an example of a locally acting ( 1931: 1831: 1475: 1413: 1364: 1320: 1276: 1256: 1237: 1188: 1137: 1083: 1024: 968: 945: 897: 877: 812: 794: 763: 720: 692: 684: 643: 625: 586: 545: 527: 382:
DNA damage appears to be the primary underlying cause of cancer. DNA damage can also increase
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in the liver even when blood glucose levels are elevated. This is the more common process of
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Bilgrami, Shumaila M; Qureshi, Sohail A; Pervez, Shahid; Abbas, Farhat (December 2014).
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An example of downregulation is the cellular decrease in the expression of a specific
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must release more insulin than normal to meet the demand and return the blood to
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Baxter, Eva; Windloch, Karolina; Gannon, Frank; Lee, Jason S (December 2014).
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O'Hagan, Heather M.; Mohammad, Helai P.; Baylin, Stephen B. (15 August 2008).
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Walker, Deena M.; Nestler, Eric J. (2018). "Neuroepigenetics and addiction".
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receptor sites on target cells, e.g. liver cells, in a person with type 2
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Downregulation or upregulation of an RNA or protein may also arise by an
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are essential genes in the error-prone and mutagenic DNA repair pathway
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occurs in 82% of colorectal cancers and epigenetic downregulation of
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to this hormone. There is also a hepatic decrease in sensitivity to
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may cause downregulation of their respective receptors, while most
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Sherwood, Lauralee; Klandorf, Hillar; Yancey, Paul (2012-01-01).
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Upregulation and downregulation can also happen as a response to
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in response to its increased activation by a molecule, such as a
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Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease
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Fröjdö, Sara; Vidal, Hubert; Pirola, Luciano (2009-02-01).
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Xu, H; Zheng, L; Dai, H; Zhou, M; Hua, Y; Shen, B (2011).
506:"Regulation of Gene Expression in the Genomic Context" 1845: 1765: 1720: 1713: 1668: 1555: 1512: 1505: 986: 984: 510:Computational and Structural Biotechnology Journal 504:Atkinson, Taylor J; Halfon, Marc S (2014-01-01). 397:Epigenetic downregulation of the DNA repair gene 426:Epigenetic upregulation of the DNA repair genes 58:decreases the production and quantities of its 913: 911: 273:and is subsequently attacked by intracellular 95:An example of upregulation is the response of 1460: 1106:"Epigenetic regulation in cancer progression" 1044: 1042: 340:, in which the kidneys become insensitive to 8: 130:Downregulation and upregulation of receptors 1717: 1509: 1467: 1453: 1445: 716:Animal Physiology: From Genes to Organisms 1437:at the U.S. National Library of Medicine 1407: 1231: 1182: 1172: 1131: 1121: 1077: 1067: 1018: 1008: 939: 920:"Epigenetic mechanisms of drug addiction" 891: 806: 757: 678: 637: 580: 539: 521: 180:Learn how and when to remove this message 261:Example: Insulin receptor downregulation 563:Krupp, M; Lane, MD (25 February 1981). 496: 333:, which leads to adult-onset diabetes. 967:. BoD – Books on Demand. p. 413. 300:. Due to the elevated levels of blood 965:New Research Directions in DNA Repair 440:Regulation of transcription in cancer 378:Regulation of transcription in cancer 325:. This can be seen in the continuing 200:are no longer required by the cell. 7: 708: 706: 249:is hormones that cause cells in the 162:adding citations to reliable sources 1899: 868:. Vol. 148. pp. 747–765. 832:"Protein Controversies in Diabetes" 569:The Journal of Biological Chemistry 292:This process is illustrated by the 874:10.1016/B978-0-444-64076-5.00048-X 452:microhomology-mediated end joining 25: 1743:Post-transcriptional modification 918:Nestler, Eric J. (January 2014). 1898: 1887: 1886: 932:10.1016/j.neuropharm.2013.04.004 783:"Insulin and Insulin Resistance" 438:occurs in numerous cancers (see 245:. An example of upregulation in 138: 1748:Post-translational modification 336:Another example can be seen in 265:Elevated levels of the hormone 149:needs additional citations for 866:Handbook of Clinical Neurology 1: 1870:Post-translational regulation 1317:10.1136/jclinpath-2012-201088 1305:Journal of Clinical Pathology 1273:10.1158/1541-7786.MCR-14-0337 1224:10.1158/1541-7786.MCR-14-0422 781:Wilcox, Gisela (2016-11-20). 610:Molecular Biology of the Cell 582:10.1016/S0021-9258(19)69862-5 472:Regulation of gene expression 44:regulation of gene expression 1818:High-throughput technique (" 1069:10.1371/journal.pgen.0030110 1010:10.1371/journal.pgen.1000155 759:10.1016/j.bbadis.2008.10.019 284:of new receptors within the 253:to become more sensitive to 230:when the long-term use of a 1696:Functional biology/medicine 787:Clinical Biochemist Reviews 421:non-small-cell lung cancers 1953: 661:Carpentier, J.-L. (1994). 477:Transcriptional regulation 375: 54:is the process by which a 1882: 1482: 1261:Molecular Cancer Research 1212:Molecular Cancer Research 1034:silenced genes in tumors. 830:Franz, Marion J. (2000). 1439:Medical Subject Headings 1174:10.1186/2193-1801-3-178 211:drugs. This results in 109:cytochrome P450 enzymes 1123:10.1186/2045-3701-4-45 523:10.5936/csbj.201401001 362:epigenetic alterations 304:in an individual, the 99:cells exposed to such 1691:Developmental biology 1686:Computational biology 1110:Cell & Bioscience 622:10.1091/mbc.11.8.2643 417:head and neck cancers 286:endoplasmic reticulum 124:progression to cancer 1865:Post-transcriptional 1400:10.1038/onc.2010.482 719:. Cengage Learning. 342:arginine vasopressin 310:islets of Langerhans 224:receptor antagonists 158:improve this article 27:Biological processes 1660:Histone methylation 926:. 76 Pt B: 259–68. 842:(3). Archived from 482:Enhancer (genetics) 392:malignant neoplasms 60:cellular components 1361:10.3892/or.9.3.529 680:10.1007/BF00400835 516:(13): e201401001. 338:diabetes insipidus 331:insulin resistance 207:mediators or from 46:and production of 1927:Molecular biology 1914: 1913: 1893:Molecular biology 1878: 1877: 1832:Mass spectrometry 1709: 1708: 1476:Molecular biology 974:978-953-51-1114-6 924:Neuropharmacology 836:Diabetes Spectrum 415:occurs in 62% of 366:nucleus accumbens 234:is discontinued. 220:receptor agonists 190: 189: 182: 90:negative feedback 16:(Redirected from 1944: 1902: 1901: 1890: 1889: 1823: 1718: 1571: 1566: 1510: 1469: 1462: 1455: 1446: 1422: 1421: 1411: 1394:(9): 1072–1081. 1379: 1373: 1372: 1349:Oncology Reports 1343: 1337: 1336: 1299: 1293: 1292: 1252: 1246: 1245: 1235: 1203: 1197: 1196: 1186: 1176: 1152: 1146: 1145: 1135: 1125: 1101: 1095: 1094: 1081: 1071: 1046: 1037: 1036: 1022: 1012: 988: 979: 978: 960: 954: 953: 943: 915: 906: 905: 895: 861: 855: 854: 852: 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653: 596: 575:(4): 1689–94. 555: 495: 494: 492: 489: 485: 484: 479: 474: 467: 464: 419:and in 42% of 373: 370: 349: 348:Drug addiction 346: 262: 259: 188: 187: 146: 144: 137: 131: 128: 120:drug addiction 52:downregulation 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1949: 1938: 1935: 1933: 1930: 1928: 1925: 1924: 1922: 1907: 1906: 1897: 1895: 1894: 1885: 1884: 1881: 1871: 1868: 1866: 1863: 1861: 1858: 1856: 1853: 1852: 1850: 1848: 1844: 1838: 1837:Lab-on-a-chip 1835: 1833: 1830: 1828: 1825: 1821: 1816: 1815: 1812: 1811:Radioactivity 1808: 1804: 1801: 1797: 1794: 1792: 1789: 1788: 1786: 1783: 1779: 1776: 1774: 1771: 1770: 1768: 1764: 1758: 1754: 1751: 1749: 1746: 1744: 1741: 1739: 1736: 1734: 1731: 1729: 1728:Cultured meat 1726: 1725: 1723: 1719: 1716: 1712: 1702: 1699: 1697: 1694: 1692: 1689: 1687: 1684: 1682: 1679: 1677: 1674: 1673: 1671: 1667: 1661: 1658: 1656: 1653: 1649: 1648:trp repressor 1646: 1644: 1643:lac repressor 1641: 1640: 1639: 1636: 1634: 1631: 1629: 1626: 1624: 1621: 1619: 1616: 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Index

Upregulate
biochemistry
biological
organisms
regulation of gene expression
gene products
cell
cellular components
RNA
proteins
receptor
hormone
neurotransmitter
negative feedback
liver
xenobiotic
dioxin
cytochrome P450 enzymes
epigenetic
drug addiction
progression to cancer

verification
improve this article
adding citations to reliable sources
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receptors
endogenous
exogenous
ligand

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