Knowledge

Intrinsic activity

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efficiency of transformation of the inactive form of the drug-receptor complex to the active drug-receptor complex may not be high enough to evoke a maximal response. Since the observed response may be less than maximal in systems with no spare receptor reserve, some low efficacy agonists are referred to as partial agonists. However, it is worth bearing in mind that these terms are relative - even partial agonists may appear as full agonists in a different system/experimental setup, as when the number of receptors increases, there may be enough drug-receptor complexes for a maximum response to be produced, even with individually low efficacy of transducing the response. There are actually relatively few
274:) are in fact partial agonists or inverse agonists, but with very low efficacy (less than 10%). Compounds considered partial agonists tend to have efficacy in between this range. Another case is represented by silent agonists, which are ligands that can place a receptor, typically an ion channel, into a desensitized state with little or no apparent activation of it, forming a complex that can subsequently generate currents when treated with an allosteric modulator. 33: 46: 120:
vary in the response they produce, even when they occupy the same number of receptors. High efficacy agonists can produce the maximal response of the receptor system while occupying a relatively low proportion of the receptors in that system. There is a distinction between efficacy and intrinsic
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Agonists of lower efficacy are not as efficient at producing a response from the drug-bound receptor, by stabilizing the active form of the drug-bound receptor. Therefore, they may not be able to produce the same maximal response, even when they occupy the entire receptor population, as the
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R. P. Stephenson (1925ā€“2004) was a British pharmacologist. Efficacy has historically been treated as a proportionality constant between the binding of the drug and the generation of the biological response. Stephenson defined efficacy as:
538: 270:) are more accurately described as high efficacy partial agonists, as a partial agonist with efficacy over ā‰ˆ80-90% is indistinguishable from a full agonist in most assays. Similarly many antagonists (such as 288: 855: 759:"Identification of Ī±7 Nicotinic Acetylcholine Receptor Silent Agonists Based on the Spirocyclic Quinuclidine-Ī” -Isoxazoline Scaffold: Synthesis and Electrophysiological Evaluation" 608: 679: 561: 116:
of the drug and which is proportional to both efficacy and affinity. This use of the word "efficacy" was introduced by Stephenson (1956) to describe the way in which
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Stevenson and Furchgott's models of efficacy have been criticised and many more have been developed. The models of efficacy are shown in Bindslev (2008).
469: 836: 1833: 2287: 17: 687: 1005: 963: 920: 885: 316:{\displaystyle \mathrm {IA} ={\frac {\text{maximal response to the test agonist}}{\text{maximal response to full agonist}}}} 1097: 1062: 938:"Drugā€“Acceptor Interactionsā€“Modeling theoretical tools to test and evaluate experimental equilibrium effects (Book review)" 106: 2440: 2384: 1791: 62: 2093: 820: 1345: 876:
Linderman JJ (2000). "Kinetic Modeling Approaches to Understanding Ligand Efficacy". In Kenakin T, Angus JA (eds.).
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Drug-Acceptor Interactions: Modeling Theoretical Tools to Test and Evaluate Experimental Equilibrium Effects
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full agonists or silent antagonists; many compounds usually considered to be full agonists (such as
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Quadri M, Matera C, Silnović A, Pismataro MC, Horenstein NA, Stokes C, et al. (August 2017).
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There are mistakes in this article; efficacy and intrinsic activity are different properties.
444:. This model was arguably flawed in that it did not incorporate the equilibrium between the 2496: 2340: 2193: 2146: 1786: 1648: 1558: 1399: 1279: 1047: 411:
is the stimulus to the biological system. The response is generated by an unknown function
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complex to produce a maximum functional response. This must be distinguished from the
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The Pharmacology of Functional, Biochemical, and Recombinant Receptor Systems
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later improved on Stephenson's model with the definition of efficacy, e, as
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agonist-bound-receptor that is shown in the del Castillo Katz model.
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Goodman and Gilman's The Pharmacological Basis of Therapeutics
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is the proportion of agonist-bound receptors (given by the
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Intrinsic activity of a test agonist is defined as:
1153: 808: 708:Chojnacka K, Papke RL, Horenstein NA (July 2013). 602: 555: 532: 432: 403: 379: 356: 315: 2515: 901:Bindslev N (2008). "Chapter 1: Simple Agonism". 636:British Journal of Pharmacology and Chemotherapy 843:. British Pharmacological Society. 2 June 2016. 55:needs attention from an expert in pharmacology 1827: 1634: 999: 714:Bioorganic & Medicinal Chemistry Letters 148:Efficacy higher than the endogenous agonist 750: 701: 623: 1834: 1820: 1006: 992: 854:Brunton L, Chabner BA, Knollman B (2011). 629: 194:Efficacy less than the endogenous agonist 2035: 1607: 1075: 1030: 953: 910: 875: 871: 869: 867: 804: 802: 782: 733: 655: 610:is the total concentration of receptors. 171:Efficacy equal to the endogenous agonist 900: 809:Foreman JC, Johansen T, Gibb AJ (2009). 124: 31: 1534: 1242: 942:Microbial Ecology in Health and Disease 935: 455: 326: 14: 2516: 1841: 1367: 1297: 864: 799: 65:may be able to help recruit an expert. 36:Efficacy spectrum of receptor ligands. 27:Measure of relative response to a drug 1815: 987: 905:. London: CRC Press. pp. 19ā€“20. 277: 1422: 306:maximal response to the test agonist 39: 632:"A modification of receptor theory" 93:refer to the relative ability of a 24: 2441:Angiotensin II receptor antagonist 2385:Endocannabinoid reuptake inhibitor 1792:Minimum bactericidal concentration 648:10.1111/j.1476-5381.1956.tb00006.x 594: 591: 588: 506: 503: 500: 296: 293: 25: 2535: 2332:Acetylcholine receptor antagonist 2094:Norepinephrine reuptake inhibitor 880:. Berlin: Springer. p. 120. 812:Textbook of Receptor Pharmacology 684:Glaxo Wellcome pharmacology guide 603:{\displaystyle _{\mathrm {Tot} }} 1782:Minimum inhibitory concentration 1013: 309:maximal response to full agonist 44: 2460:Vasopressin receptor antagonist 2374:Cannabinoid receptor antagonist 1722:WHO list of essential medicines 1215:Non-specific effect of vaccines 929: 630:Stephenson RP (December 1956). 448:agonist-bound-receptor and the 2446:Endothelin receptor antagonist 2310:Acetylcholine receptor agonist 2069:Adrenergic receptor antagonist 1777:Antimicrobial pharmacodynamics 894: 847: 829: 815:(Second ed.). CRC Press. 583: 574: 495: 486: 427: 421: 13: 1: 2278:Glutamate receptor antagonist 2194:Serotonin receptor antagonist 2147:Histamine receptor antagonist 1922:Negative allosteric modulator 1916:Positive allosteric modulator 1702:Functional analog (chemistry) 948:(4). London: Routledge: 213. 616: 2435:Adenosine reuptake inhibitor 2369:Cannabinoid receptor agonist 2288:Glutamate reuptake inhibitor 2207:Serotonin reuptake inhibitor 2118:Dopamine receptor antagonist 1255:Hill equation (biochemistry) 860:(12th ed.). p. 46. 556:{\displaystyle \varepsilon } 112:, which is a measure of the 7: 2123:Dopamine reuptake inhibitor 2045:Adrenergic receptor agonist 128: 57:. The specific problem is: 10: 2540: 2414:Opioid receptor antagonist 2268:Glutamate receptor agonist 2189:Serotonin receptor agonist 2142:Histamine receptor agonist 1770:Antimicrobial pharmacology 1250:Doseā€“response relationship 1180:Desensitization (medicine) 837:"R P ('Steve') Stephenson" 726:10.1016/j.bmcl.2013.05.039 2472: 2427: 2394: 2359: 2300: 2258: 2229: 2220: 2179: 2132: 2113:Dopamine receptor agonist 2103: 2022: 2008: 1993: 1976: 1969: 1849: 1692:Coinduction (anesthetics) 1685: 1486: 1358: 1144: 1021: 955:10.1080/08910600802431931 841:Pharmacology Hall of Fame 440:, which is assumed to be 219:Affinity but no efficacy 137: 2379:Endocannabinoid enhancer 2325:Cholinesterase inhibitor 2244:GABA receptor antagonist 1757:Multiple drug resistance 1730:Tolerance and resistance 1098:Physiological antagonist 63:WikiProject Pharmacology 2419:Enkephalinase inhibitor 2409:Opioid receptor agonist 2249:GABA reuptake inhibitor 1954:♦ Miscellaneous: 1508:Neuropsychopharmacology 1270:Cheng-Prussoff Equation 1265:Del Castillo Katz model 1192:Other effects of ligand 1175:Receptor (biochemistry) 1093:Irreversible antagonist 18:Efficacy (pharmacology) 2002:Ion channel modulators 1644:Classical pharmacology 1405:Plasma protein binding 1380:Volume of distribution 1088:Competitive antagonist 775:10.1002/cmdc.201700162 604: 557: 534: 434: 405: 381: 358: 317: 37: 2239:GABA receptor agonist 1752:Antibiotic resistance 1544:Clinical pharmacology 1063:Physiological agonist 1023:Ligand (biochemistry) 912:10.4324/9781315159782 605: 558: 535: 435: 406: 382: 359: 318: 125:Mechanism of efficacy 35: 1649:Reverse pharmacology 1559:Pharmacoepidemiology 1400:Biological half-life 1280:Ligand binding assay 1154:Activity at receptor 1048:Irreversible agonist 571: 547: 470: 456:Furchgott's efficacy 433:{\displaystyle f(S)} 415: 395: 371: 357:{\displaystyle S=ep} 339: 327:Stevenson's efficacy 289: 2455:receptor antagonist 1697:Combination therapy 1585:Pharmacoinformatics 1554:Medicinal chemistry 1160:Mechanism of action 461:Robert F. Furchgott 1843:Pharmacomodulation 1667:Immunopharmacology 1617:Pharmacotoxicology 1518:Psychopharmacology 1310:Intrinsic activity 1210:Pleiotropy (drugs) 1131:Agonist-antagonist 1043:Endogenous agonist 936:Kirkeby H (2017). 600: 565:intrinsic efficacy 553: 530: 523: 516: 430: 401: 377: 354: 313: 278:Intrinsic activity 83:Intrinsic activity 38: 2511: 2510: 2507: 2506: 2468: 2467: 2296: 2295: 2216: 2215: 1986:Enzyme inhibition 1809: 1808: 1805: 1804: 1765: 1764: 1662:Photopharmacology 1657: 1656: 1630: 1629: 1603: 1602: 1567: 1566: 1530: 1529: 1523:Electrophysiology 1513:Neuropharmacology 1468: 1467: 1418: 1417: 1354: 1353: 1341:Therapeutic index 1293: 1292: 1238: 1237: 1187: 1186: 1116: 1115: 1071: 1070: 965:978-1-351-66057-0 922:978-91-977071-0-7 887:978-3-540-66124-5 769:(16): 1335ā€“1348. 720:(14): 4145ā€“4149. 580: 492: 481: 479: 404:{\displaystyle S} 380:{\displaystyle p} 311: 310: 307: 259: 258: 242:Inverse efficacy 215:Silent antagonist 80: 79: 16:(Redirected from 2531: 2524:Pharmacodynamics 2485:Enzyme cofactors 2404:Opioid modulator 2361:Cannabinoidergic 2227: 2226: 2033: 2032: 2020: 2019: 1974: 1973: 1836: 1829: 1822: 1813: 1812: 1767: 1766: 1727: 1726: 1707:Polypharmacology 1632: 1631: 1605: 1604: 1595:Pharmacogenomics 1590:Pharmacogenetics 1569: 1568: 1532: 1531: 1493: 1492: 1420: 1419: 1390:Rate of infusion 1365: 1364: 1360:Pharmacokinetics 1295: 1294: 1240: 1239: 1189: 1188: 1151: 1150: 1146:Pharmacodynamics 1126:Neurotransmitter 1108:Enzyme inhibitor 1073: 1072: 1028: 1027: 1008: 1001: 994: 985: 984: 978: 977: 957: 933: 927: 926: 914: 898: 892: 891: 873: 862: 861: 851: 845: 844: 833: 827: 826: 806: 797: 796: 786: 754: 748: 747: 737: 705: 699: 698: 696: 695: 686:. Archived from 676: 670: 669: 659: 627: 609: 607: 606: 601: 599: 598: 597: 581: 578: 562: 560: 559: 554: 539: 537: 536: 531: 522: 517: 512: 511: 510: 509: 493: 490: 439: 437: 436: 431: 410: 408: 407: 402: 386: 384: 383: 378: 363: 361: 360: 355: 322: 320: 319: 314: 312: 308: 305: 304: 299: 129: 75: 72: 66: 48: 47: 40: 21: 2539: 2538: 2534: 2533: 2532: 2530: 2529: 2528: 2514: 2513: 2512: 2503: 2464: 2454: 2423: 2390: 2355: 2292: 2254: 2212: 2201: 2175: 2170: 2162: 2154: 2128: 2099: 2013: 2004: 1989: 1965: 1911:Inverse agonist 1901:Partial agonist 1845: 1840: 1810: 1801: 1761: 1747:Drug resistance 1725: 1681: 1653: 1626: 1622:Neurotoxicology 1599: 1563: 1526: 1488: 1482: 1464: 1414: 1410:Bioavailability 1395:Onset of action 1350: 1289: 1234: 1183: 1140: 1112: 1103:Inverse agonist 1067: 1053:Partial agonist 1017: 1012: 982: 981: 966: 934: 930: 923: 899: 895: 888: 874: 865: 852: 848: 835: 834: 830: 823: 807: 800: 755: 751: 706: 702: 693: 691: 678: 677: 673: 628: 624: 619: 587: 586: 582: 577: 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1078: 1074: 1064: 1061: 1059: 1056: 1054: 1051: 1049: 1046: 1044: 1041: 1039: 1036: 1035: 1033: 1029: 1026: 1024: 1020: 1016: 1009: 1004: 1002: 997: 995: 990: 989: 986: 975: 971: 967: 961: 956: 951: 947: 943: 939: 932: 924: 918: 913: 908: 904: 897: 889: 883: 879: 872: 870: 868: 859: 858: 850: 842: 838: 832: 824: 822:9781439887578 818: 814: 813: 805: 803: 794: 790: 785: 780: 776: 772: 768: 764: 760: 753: 745: 741: 736: 731: 727: 723: 719: 715: 711: 704: 690:on 2019-07-26 689: 685: 681: 675: 667: 663: 658: 653: 649: 645: 641: 637: 633: 626: 622: 614: 611: 566: 550: 527: 524: 519: 513: 483: 476: 473: 466: 465: 464: 462: 453: 451: 447: 443: 424: 418: 398: 390: 389:Hill equation 374: 351: 348: 345: 342: 335: 334: 333: 300: 285: 284: 283: 275: 273: 269: 265: 255: 253: 250: 247: 244: 241: 239: 236: 235: 232: 230: 227: 224: 221: 218: 216: 213: 212: 208: 205: 202: 199: 196: 193: 191: 188: 187: 184: 182: 179: 176: 173: 170: 168: 165: 164: 161: 159: 156: 153: 150: 147: 145: 142: 141: 134: 131: 130: 122: 119: 115: 111: 104: 100: 96: 92: 88: 84: 74: 64: 60: 56: 53:This article 51: 42: 41: 34: 30: 19: 2495: 2483: 2181:Serotonergic 2105:Dopaminergic 1984: 1712:Chemotherapy 1672:Cell biology 1573:Biochemistry 1497:Neuroscience 1445:Distribution 1375:Loading dose 1309: 1058:Superagonist 1015:Pharmacology 945: 941: 931: 902: 896: 877: 856: 849: 840: 831: 811: 766: 762: 752: 717: 713: 703: 692:. Retrieved 688:the original 683: 674: 639: 635: 625: 612: 564: 542: 459: 449: 445: 366: 330: 281: 263: 260: 167:Full agonist 144:Superagonist 135:Description 90: 86: 82: 81: 68: 58: 54: 29: 2497:Amino acids 2396:Opioidergic 2302:Cholinergic 2015:transporter 1995:Ion channel 1931:Transporter 1875:Ion channel 1797:Bactericide 1473:Compartment 1284:Patch clamp 1260:Schild plot 763:ChemMedChem 446:inactivated 2345:Ganglionic 2336:Muscarinic 2314:Muscarinic 2037:Adrenergic 1906:Antagonist 1677:Physiology 1609:Toxicology 1501:psychology 1450:Metabolism 1440:Absorption 1434:Liberation 1276:Organ bath 1204:Functional 1083:Antagonist 1076:Inhibitory 1031:Excitatory 694:2009-07-11 617:References 442:hyperbolic 121:activity. 71:April 2019 2492:Precursor 2341:Nicotinic 2319:Nicotinic 2231:GABAergic 1956:Precursor 1941:Inhibitor 1867:Inhibitor 1459:Clearance 1455:Excretion 1274:Methods ( 551:ε 525:⋅ 514:⏟ 484:ε 450:activated 2518:Category 2480:Cofactor 2350:Muscular 2010:Receptor 1961:Cofactor 1947:Releaser 1935:Enhancer 1929:♦ 1892:Receptor 1890:♦ 1873:♦ 1856:♦ 1577:genetics 1549:Pharmacy 1536:Medicine 1346:Affinity 1305:Efficacy 1243:Analysis 1225:Toxicity 974:83584731 793:28494140 744:23746476 666:13383117 272:naloxone 118:agonists 103:affinity 99:receptor 91:efficacy 2437:(AdoRI) 2387:(eCBRI) 1970:Classes 1896:Agonist 1884:Blocker 1862:Inducer 1487:Related 1430:(L)ADME 1384:Initial 1368:Metrics 1315:Potency 1298:Metrics 1200:Binding 1170:Binding 1038:Agonist 784:5573630 735:3882203 657:1510558 563:is the 132:Ligand 114:potency 2381:(eCBE) 1978:Enzyme 1879:Opener 1858:Enzyme 1489:fields 972:  962:  919:  884:  819:  791:  781:  742:  732:  664:  654:  543:where 391:) and 367:where 89:) and 2494:(see 2482:(see 2428:Other 2251:(GRI) 2209:(SRI) 2125:(DRI) 2096:(NRI) 2012:& 1924:(NAM) 1918:(PAM) 1850:Types 1686:Other 1423:LADME 970:S2CID 248:< 206:< 200:< 154:> 2282:NMDA 2272:AMPA 2198:5-HT 2000:See 1983:see 1949:(RA) 1943:(RI) 1937:(RE) 1575:and 1499:and 1335:TD50 1331:LD50 1327:ED50 1323:IC50 1319:EC50 1121:Drug 960:ISBN 917:ISBN 882:ISBN 817:ISBN 789:PMID 740:PMID 662:PMID 567:and 264:true 209:100 180:100 157:100 95:drug 1432:: ( 950:doi 907:doi 779:PMC 771:doi 730:PMC 722:doi 652:PMC 644:doi 268:DOI 2520:: 2451:NK 2352:)) 2321:) 2222:AA 2065:)) 2024:BA 1933:: 1894:: 1877:: 1860:: 1333:, 1329:, 1325:, 1321:, 1282:, 1278:, 1202:, 968:. 958:. 946:20 944:. 940:. 915:. 866:^ 839:. 801:^ 787:. 777:. 767:12 765:. 761:. 738:. 728:. 718:23 716:. 712:. 682:. 660:. 650:. 640:11 638:. 634:. 251:0 245:E 228:0 225:= 222:E 203:E 197:0 177:= 174:E 151:E 109:50 107:EC 87:IA 2500:) 2488:) 2453:1 2343:( 2334:( 2312:( 2284:) 2280:( 2274:) 2270:( 2203:) 2200:3 2196:( 2172:) 2169:3 2167:H 2161:2 2159:H 2153:1 2151:H 2149:( 2090:) 2088:Ī² 2084:) 2082:2 2077:1 2075:( 2073:Ī± 2071:( 2063:2 2058:1 2056:( 2054:Ī² 2049:Ī± 2047:( 2028:M 2026:/ 1835:e 1828:t 1821:v 1461:) 1457:( 1436:) 1386:) 1382:( 1337:) 1317:( 1286:) 1231:) 1227:( 1206:) 1007:e 1000:t 993:v 976:. 952:: 925:. 909:: 890:. 825:. 795:. 773:: 746:. 724:: 697:. 668:. 646:: 595:t 592:o 589:T 584:] 579:R 575:[ 528:p 520:e 507:t 504:o 501:T 496:] 491:R 487:[ 477:= 474:S 428:) 425:S 422:( 419:f 399:S 375:p 352:p 349:e 346:= 343:S 301:= 297:A 294:I 97:- 85:( 73:) 69:( 20:)

Index

Efficacy (pharmacology)

WikiProject Pharmacology
drug
receptor
affinity
EC50
potency
agonists
Superagonist
Full agonist
Partial agonist
Silent antagonist
Inverse agonist
DOI
naloxone
Hill equation
hyperbolic
Robert F. Furchgott
"A modification of receptor theory"
doi
10.1111/j.1476-5381.1956.tb00006.x
PMC
1510558
PMID
13383117
"In vitro pharmacology: concentration-response curves"
the original
"Synthesis and evaluation of a conditionally-silent agonist for the Ī±7 nicotinic acetylcholine receptor"
doi

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