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Humoral immunity

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completely diverges from the previous pathways, as this pathway spontaneously initiates in the presence of hydrolyzed C3, which then recruits other subunits which can be cleaved to form C3 convertase. In all three pathways, once C3 convertase is synthesized, complements are cleaved into subunits which either form a structure called the membrane attack complex (MAC) on the bacterial cell wall to destroy the bacteria or act as cytokines and chemokines, amplifying the immune response.
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cell. Step 5: When the B cells are activated, some B cells turn into plasma cells and are released in the blood, while other B cells become B memory cells that quicken response for a second exposure. Step 6: Plasma cells then secrete antibodies, which bind to antigens to fight the invading pathogens.
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Step 1: A macrophage engulfs the pathogen. Step 2: The macrophage then digests the bacterium and presents the pathogen's antigens. Step 3: A T helper cell binds to the macrophage and becomes an activated T helper cell. Step 4: The activated T helper cell binds to a B cell in order to activate the B
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These antibodies will encounter antigens and bind with them. This will either interfere with the chemical interaction between host and foreign cells, or they may form bridges between their antigenic sites hindering their proper functioning. Their presence might also attract macrophages or killer
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This differs from the mannose-binding lectin pathway, which is initiated by bacterial carbohydrate motifs, such as mannose, found on the surface of bacterium. After the binding process, the same subunit cleavage and synthesis occurs as in the classical pathway. The alternate complement pathway
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of the cell. The complement system consists of more than 35 soluble and cell-bound proteins, 12 of which are directly involved in the complement pathways. The complement system is involved in the activities of both innate immunity and acquired immunity.
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An antibody is used by the acquired immune system to identify and neutralize foreign objects like bacteria and viruses. Each antibody recognizes a specific antigen unique to its target. By binding their specific antigens, antibodies can cause
972: 483:. Each immunoglobulin class differs in its biological properties and has evolved to deal with different antigens. Antibodies are synthesized and secreted by plasma cells that are derived from the B cells of the immune system. 526:
by host antibodies. The cause is usually a clerical error, such as the wrong unit of blood being given to the wrong patient. The symptoms are fever and chills, sometimes with back pain and pink or red urine
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The classical pathway is initiated through exposure to free-floating antigen-bound antibodies. This leads to enzymatic cleavage of smaller complement subunits which synthesize to form the C3 convertase.
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that helps clear pathogens from an organism. It is derived from many small blood plasma proteins that work together to disrupt the target cell's
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Original discovery (1900), antigen-antibody binding hypothesis (1938), produced by B cells (1948), structure (1972), immunoglobulin genes (1976)
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is credited with the development of the humoral theory. In 1890, Buchner described alexins as "protective substances" that exist in the
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that could neutralize the activity of the toxin and could transfer immunity to non-immune animals. In 1897, Paul Ehrlich showed that
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When a B cell encounters an antigen, a signal is activated, the antigen binds to the receptor and is taken inside the B cell by
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that induce B cells to divide rapidly, making thousands of identical clones of the B cell. These daughter cells either become
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of the BCR. Once a BCR interacts with an antigen, it creates a binding signal which directs the B cell to produce a unique
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along the cell surface. These BCRs are membrane-bound protein complexes that have a high binding affinity for specific
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Humoral immunity refers to antibody production and the coinciding processes that accompany it, including:
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showed that disease need not be caused by microorganisms themselves. They discovered that cell-free
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and have the ability to work directly with antigens to provide responses to pathogens present.
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Serum substances that coat the outer membrane of foreign substances and enhance the rate of
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were sufficient to cause disease. In 1890, filtrates of diphtheria, later named
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Substances in the serum that can neutralize the activity of toxins, enabling
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Janeway Jr CA, Travers P, Walport M, Shlomchik MJ (November 21, 2001).
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animals in an attempt to demonstrate that immunized serum contained an
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and humoral immunity. This discovery helped to bridge the features of
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reaction, results in the rapid destruction (hemolysis) of the donor
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The concept of humoral immunity developed based on the analysis of
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components of the innate response that leads to a combination of
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Three biochemical pathways activate the complement system: the
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receptors, and stimulate other immune responses, such as the
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Janeway Jr CA, Travers P, Walport M, Shlomchik MJ (2001).
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activation is a large part of the humoral immune response.
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and precipitation of antibody-antigen products, prime for
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begin the maturation process in the bone marrow, gaining
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released by the destruction of red blood cells can cause
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Following the 1888 discovery of the bacteria that cause
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Immunobiology: The Immune System in Health and Disease.
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Clinical Journal of the American Society of Nephrology
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Immunobiology: The Immune System in Health and Disease
90:. The immune system is divided into a more primitive 1140:"Molecules Great and Small: The Complement System" 806: 463:. In mammals, there are five types of antibodies: 272:Major discoveries in the study of humoral immunity 21:"Humoral" redirects here. Not to be confused with 945: 259:, which became the first major success of modern 1686: 185:. Alexins, later redefined as "complements" by 706:fraction. Most of these proteins circulate as 687:Activation of this system leads to cytolysis, 459:. Structurally, antibodies are large Y-shaped 1259: 1199: 1137: 801: 870:"The experimental foundations of Immunology" 643: 1121:"The complement system and innate immunity" 1053:"B-cell activation by armed helper T cells" 884: 840: 575:, where they begin to encounter pathogens. 383:Serum substances that work with complements 1266: 1252: 797: 795: 793: 298:that are capable of killing microorganisms 67:. Humoral immunity is also referred to as 1225: 1171: 1095: 970: 102:, each of which contain both humoral and 1138:Mathern DR, Heeger PS (September 2015). 739: 600:. The MHC-II proteins are recognized by 577: 356:Serum substances that aggregate bacteria 331:complement proteins to induce bacterial 1069: 946:Pier GB, Lyczak JB, Wetzler LM (2004). 890: 836: 834: 832: 830: 790: 616:The B cell waits for a helper T cell (T 611: 137:functions of antibodies, which include 1687: 1200:Meltzer SJ, Norris C (November 1897). 1046: 1044: 547:In humoral immune response, the naive 542: 1247: 1000: 876:. University of Pavia. Archived from 863: 861: 859: 857: 1206:The Journal of Experimental Medicine 867: 827: 813:(5th ed.). Garland Publishing. 656: 587: 1041: 948:Immunology, Infection, and Immunity 939: 329:Serum substances that work with the 319:von Behring and ShibasaburĹŤ (1890) 13: 1192: 854: 531:). The major complication is that 169:activity of the serum components. 133:generation. It also refers to the 14: 1706: 1072:"Complement and humoral immunity" 874:Immunology Course Medical School 358:and precipitate bacterial toxins 1131: 1112: 893:"Opsonins and Other Antibodies" 296:Soluble components in the serum 1593:Immunoglobulin class switching 1063: 994: 964: 847:Immunity in infectious disease 727:mannose-binding lectin pathway 1: 1088:10.1016/j.vaccine.2008.11.022 1019:10.1158/2326-6066.CIR-14-0029 850:. Cambridge University Press. 783: 437: 1070:Carroll MC (December 2008). 723:alternate complement pathway 719:classical complement pathway 7: 891:Hektoen L (February 1909). 755: 710:, which are inactive until 667:The complement system is a 181:and are capable of killing 10: 1711: 1422:Polyclonal B cell response 1007:Cancer Immunology Research 917:10.1126/science.29.737.241 660: 624:cell, which then releases 567:that only binds with that 441: 160: 157:and pathogen elimination. 145:neutralization, classical 69:antibody-mediated immunity 20: 1656: 1614: 1556: 1457: 1387: 1295: 1288: 973:"Humoral Immune Response" 644:Antibody-antigen reaction 971:Boundless (2016-05-26). 695:, immune clearance, and 1001:Eisen HN (2014-05-01). 553:B-cell receptors (BCRs) 499:and other cells, block 455:found within blood and 451:or Immunoglobulins are 385:to lyse red blood cells 244:form against the plant 189:, were shown to be the 1536:Tolerance in pregnancy 1278:adaptive immune system 764:(vs. humoral immunity) 762:Cell-mediated immunity 748: 584: 96:adaptive immune system 65:cell-mediated immunity 49:antimicrobial peptides 1571:Somatic hypermutation 1405:Polyclonal antibodies 1400:Monoclonal antibodies 743: 581: 39:– including secreted 1588:Junctional diversity 1356:Antigen presentation 1156:10.2215/CJN.06230614 712:proteolytic cleavage 673:innate immune system 649:cells to attack and 612:B cell proliferation 537:acute kidney failure 516:transfusion reaction 315:passive immunization 257:diphtheria antitoxin 222:Kitasato ShibasaburĹŤ 92:innate immune system 63:. It contrasts with 53:extracellular fluids 35:that is mediated by 1583:V(D)J recombination 1566:Affinity maturation 1318:Antigenic variation 1218:10.1084/jem.2.6.701 909:1909Sci....29..241H 773:Polyclonal response 669:biochemical cascade 543:Antibody production 274: 127:affinity maturation 94:and an acquired or 80:cellular components 45:complement proteins 749: 638:circulatory system 585: 505:complement pathway 270: 16:Aspect of immunity 1682: 1681: 1610: 1609: 1360:professional APCs 663:Complement system 657:Complement system 588:B cell activation 512:blood transfusion 461:globular proteins 435: 434: 230:diphtheria toxins 203:acquired immunity 106:immune elements. 74:The study of the 31:is the aspect of 1702: 1576:Clonal selection 1548:Immune privilege 1543:Immunodeficiency 1498:Cross-reactivity 1488:Hypersensitivity 1293: 1292: 1268: 1261: 1254: 1245: 1244: 1239: 1229: 1186: 1185: 1175: 1150:(9): 1636–1650. 1135: 1129: 1128: 1116: 1110: 1109: 1099: 1067: 1061: 1060: 1048: 1039: 1038: 998: 992: 991: 989: 988: 979:. Archived from 968: 962: 961: 943: 937: 936: 903:(737): 241–248. 888: 882: 881: 865: 852: 851: 838: 825: 824: 812: 799: 573:lymphatic organs 510:An incompatible 481:immunoglobulin M 477:immunoglobulin G 473:immunoglobulin E 469:immunoglobulin D 465:immunoglobulin A 338:Richard Pfeiffer 275: 269: 218:Emil von Behring 149:activation, and 29:Humoral immunity 1710: 1709: 1705: 1704: 1703: 1701: 1700: 1699: 1685: 1684: 1683: 1678: 1652: 1606: 1552: 1531:Clonal deletion 1459: 1453: 1383: 1284: 1272: 1242: 1195: 1193:Further reading 1190: 1189: 1136: 1132: 1117: 1113: 1068: 1064: 1059:(5th ed.). 1049: 1042: 999: 995: 986: 984: 969: 965: 958: 944: 940: 889: 885: 866: 855: 839: 828: 821: 800: 791: 786: 758: 677:plasma membrane 665: 659: 646: 623: 619: 614: 598:MHC-II proteins 590: 561:variable region 545: 524:red blood cells 446: 440: 384: 369: 357: 349: 330: 303:Ehrlich (1892) 302: 301:Buchner (1890), 297: 232:, were used to 163: 125:switching, and 119:germinal center 113:activation and 26: 17: 12: 11: 5: 1708: 1698: 1697: 1680: 1679: 1677: 1676: 1671: 1666: 1660: 1658: 1654: 1653: 1651: 1650: 1645: 1644: 1643: 1633: 1632: 1631: 1620: 1618: 1612: 1611: 1608: 1607: 1605: 1604: 1595: 1590: 1585: 1580: 1579: 1578: 1573: 1562: 1560: 1558:Immunogenetics 1554: 1553: 1551: 1550: 1545: 1540: 1539: 1538: 1533: 1528: 1523: 1518: 1506: 1505: 1503:Co-stimulation 1500: 1495: 1490: 1485: 1480: 1475: 1470: 1463: 1461: 1455: 1454: 1452: 1451: 1446: 1444:Immune complex 1440: 1439: 1434: 1429: 1424: 1419: 1418: 1417: 1412: 1407: 1402: 1391: 1389: 1385: 1384: 1382: 1381: 1376: 1371: 1366: 1364:Dendritic cell 1352: 1351: 1346: 1345: 1344: 1342:Conformational 1339: 1328: 1327: 1322: 1321: 1320: 1315: 1310: 1299: 1297: 1290: 1286: 1285: 1271: 1270: 1263: 1256: 1248: 1241: 1240: 1212:(6): 701–709. 1196: 1194: 1191: 1188: 1187: 1130: 1111: 1082:(8): I28–I33. 1062: 1040: 1013:(5): 381–392. 993: 963: 956: 938: 883: 880:on 2011-05-30. 853: 826: 819: 788: 787: 785: 782: 781: 780: 775: 770: 765: 757: 754: 661:Main article: 658: 655: 645: 642: 621: 617: 613: 610: 602:helper T cells 589: 586: 544: 541: 529:hemoglobinuria 442:Main article: 439: 436: 433: 432: 429: 426: 420: 419: 409: 399: 393: 392: 386: 381: 375: 374: 359: 354: 342: 341: 335: 327: 325:Bacteriolysins 321: 320: 317: 311: 305: 304: 299: 294: 286: 285: 282: 279: 183:microorganisms 162: 159: 121:formation and 82:that form the 47:, and certain 37:macromolecules 15: 9: 6: 4: 3: 2: 1707: 1696: 1693: 1692: 1690: 1675: 1672: 1670: 1667: 1665: 1662: 1661: 1659: 1655: 1649: 1646: 1642: 1639: 1638: 1637: 1634: 1630: 1627: 1626: 1625: 1622: 1621: 1619: 1617: 1613: 1603: 1599: 1596: 1594: 1591: 1589: 1586: 1584: 1581: 1577: 1574: 1572: 1569: 1568: 1567: 1564: 1563: 1561: 1559: 1555: 1549: 1546: 1544: 1541: 1537: 1534: 1532: 1529: 1527: 1526:Clonal anergy 1524: 1522: 1519: 1517: 1514: 1513: 1512: 1508: 1507: 1504: 1501: 1499: 1496: 1494: 1491: 1489: 1486: 1484: 1481: 1479: 1476: 1474: 1471: 1469: 1465: 1464: 1462: 1456: 1450: 1447: 1445: 1442: 1441: 1438: 1435: 1433: 1430: 1428: 1425: 1423: 1420: 1416: 1415:Microantibody 1413: 1411: 1408: 1406: 1403: 1401: 1398: 1397: 1396: 1393: 1392: 1390: 1386: 1380: 1377: 1375: 1372: 1370: 1367: 1365: 1361: 1357: 1354: 1353: 1350: 1347: 1343: 1340: 1338: 1335: 1334: 1333: 1330: 1329: 1326: 1323: 1319: 1316: 1314: 1311: 1309: 1306: 1305: 1304: 1301: 1300: 1298: 1294: 1291: 1287: 1283: 1279: 1276: 1269: 1264: 1262: 1257: 1255: 1250: 1249: 1246: 1237: 1233: 1228: 1223: 1219: 1215: 1211: 1207: 1203: 1198: 1197: 1183: 1179: 1174: 1169: 1165: 1161: 1157: 1153: 1149: 1145: 1141: 1134: 1126: 1122: 1115: 1107: 1103: 1098: 1093: 1089: 1085: 1081: 1077: 1073: 1066: 1058: 1054: 1047: 1045: 1036: 1032: 1028: 1024: 1020: 1016: 1012: 1008: 1004: 997: 983:on 2016-10-12 982: 978: 974: 967: 959: 957:9781683672111 953: 950:. 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Retrieved 981:the original 976: 966: 947: 941: 900: 896: 886: 878:the original 873: 868:Gherardi E. 846: 808: 750: 735: 716: 697:inflammation 693:opsonization 686: 666: 647: 634:memory cells 630:plasma cells 615: 591: 546: 509: 493:phagocytosis 485: 447: 403:phagocytosis 389:Jules Bordet 271: 207: 187:Paul Ehrlich 171:Hans Buchner 164: 155:phagocytosis 117:production, 108: 73: 68: 28: 27: 18: 1616:Lymphocytes 1275:Lymphocytic 679:leading to 651:phagocytose 594:endocytosis 497:macrophages 407:macrophages 352:precipitins 347:agglutinins 175:blood serum 131:memory cell 100:vertebrates 61:body fluids 1695:Immunology 1657:Substances 1521:Peripheral 1509:Inaction: 1388:Antibodies 1369:Macrophage 1282:complement 987:2017-04-15 784:References 725:, and the 689:chemotaxis 533:hemoglobin 449:Antibodies 438:Antibodies 379:Hemolysins 362:von Gruber 345:Bacterial 309:Antitoxins 291:Complement 289:Alexin(s)/ 284:Discovery 265:infections 242:antibodies 210:diphtheria 177:and other 147:complement 88:immunology 41:antibodies 1674:Cytolysin 1664:Cytokines 1511:Tolerance 1460:tolerance 1379:Immunogen 1164:1555-9041 1027:2326-6066 977:Boundless 681:cytolysis 626:cytokines 520:hemolytic 514:causes a 278:Substance 238:antitoxin 234:vaccinate 226:filtrates 76:molecular 1689:Category 1624:Cellular 1468:Immunity 1466:Action: 1449:Paratope 1437:Idiotype 1427:Allotype 1395:Antibody 1349:Mimotope 1313:Allergen 1296:Antigens 1289:Lymphoid 1236:19866859 1182:25568220 1106:19388161 1035:24795350 933:17788933 844:(1905). 805:(2001). 778:Serology 756:See also 708:zymogens 704:globulin 565:antibody 557:antigens 444:Antibody 431:Ehrlich 424:Antibody 397:Opsonins 281:Activity 195:cellular 139:pathogen 135:effector 115:cytokine 104:cellular 33:immunity 1669:Opsonin 1648:NK cell 1636:Humoral 1516:Central 1483:Allergy 1432:Isotype 1332:Epitope 1303:Antigen 1227:2117951 1173:4559511 1097:4018718 1076:Vaccine 925:1634893 905:Bibcode 897:Science 671:of the 606:T-cells 569:antigen 549:B cells 418:(1903) 416:Douglas 391:(1899) 373:(1897) 368:(1896), 340:(1895) 214:tetanus 191:soluble 161:History 151:opsonin 123:isotype 23:humeral 1641:B cell 1629:T cell 1374:B cell 1337:Linear 1325:Hapten 1234:  1224:  1180:  1170:  1162:  1104:  1094:  1033:  1025:  954:  931:  923:  817:  745:B cell 721:, the 653:them. 479:, and 412:Wright 366:Durham 246:toxins 199:innate 57:humors 921:JSTOR 701:serum 501:viral 457:lymph 371:Kraus 333:lysis 253:abrin 249:ricin 143:toxin 59:, or 1280:and 1232:PMID 1178:PMID 1160:ISSN 1102:PMID 1031:PMID 1023:ISSN 952:ISBN 929:PMID 815:ISBN 414:and 364:and 350:and 251:and 220:and 212:and 201:and 141:and 129:and 78:and 1602:HLA 1598:MHC 1222:PMC 1214:doi 1168:PMC 1152:doi 1092:PMC 1084:doi 1015:doi 913:doi 632:or 495:by 405:by 293:(s) 111:Th2 98:of 1691:: 1362:: 1230:. 1220:. 1208:. 1204:. 1176:. 1166:. 1158:. 1148:10 1146:. 1142:. 1123:. 1100:. 1090:. 1080:26 1078:. 1074:. 1055:. 1043:^ 1029:. 1021:. 1009:. 1005:. 975:. 927:. 919:. 911:. 901:29 899:. 895:. 872:. 856:^ 829:^ 792:^ 714:. 691:, 640:. 539:. 507:. 475:, 471:, 467:, 267:. 216:, 205:. 71:. 43:, 1600:/ 1358:/ 1267:e 1260:t 1253:v 1238:. 1216:: 1210:2 1184:. 1154:: 1108:. 1086:: 1037:. 1017:: 1011:2 990:. 960:. 935:. 915:: 907:: 823:. 622:H 618:H 527:( 25:.

Index

humeral
immunity
macromolecules
antibodies
complement proteins
antimicrobial peptides
extracellular fluids
humors
body fluids
cell-mediated immunity
molecular
cellular components
immune system
immunology
innate immune system
adaptive immune system
vertebrates
cellular
Th2
cytokine
germinal center
isotype
affinity maturation
memory cell
effector
pathogen
toxin
complement
opsonin
phagocytosis

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