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Melanocyte

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436: 36: 428: 90: 692:. MAMPs, also known as PAMPs, are microbial associated molecular patterns, small molecular elements such as proteins, carbohydrates, and lipids present on or in a given pathogen. In addition, cytokine production by melanocytes can be triggered by cytokines secreted by other nearby immune cells. 727:
Tyrosine is the non-essential amino acid precursor of melanin. Tyrosine is converted to dihydroxyphenylalanine (DOPA) via the enzyme tyrosinase. Then DOPA is polymerized into melanin. The copper-ion based enzyme-catalyzed oxidative transformation of catechol derivative dopa to light absorbing
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In addition to their role as UV radical scavengers, melanocytes are also part of the immune system, and are considered to be immune cells. Although the full role of melanocytes in immune response is not fully understood, melanocytes share many characteristics with
514:: those in dark-toned skin are "packaged into peri-nuclear distributed, ellipsoid" melanosomes while those light-tone skin are "assembled into clustered small, circular melanosomes". There are also differences in the quantity and relative amounts of 763:. This is mainly a consequence of alpha-MSH being secreted along with the hormone associated with reproductive tendencies in primates. Alpha-MSH is a cleavage product of ACTH that has an equal affinity for the MC1 receptor on melanocytes as ACTH. 470:
There are both basal and activated levels of melanogenesis; in general, lighter-skinned people have low basal levels of melanogenesis. Exposure to UV-B radiation causes increased melanogenesis. The purpose of melanogenesis is to protect the
814:. When a hair is lost and the hair follicle regenerates, the stem cells are activated. These stem cells develop into both keratinocyte precursors and melanoblasts - and these melanoblasts supply both hair and skin (moving into the 494:
Typically, between 1000 and 2000 melanocytes are found per square millimeter of skin or approximately 5% to 10% of the cells in the basal layer of epidermis. Although their size can vary, melanocytes are typically 7 μm in length.
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Numerous stimuli are able to alter melanogenesis, or the production of melanin by cultured melanocytes, although the method by which it works is not fully understood. Increased melanin production is seen in conditions where
629:, a type of MHC expressed only by certain antigen presenting cells of the immune system, when stimulated by interactions with antigen or cytokines. All cells in any given vertebrate express MHC, but most cells only express 482:
and melanogenesis are virtually identical, they are assumed to be induced by the same mechanism. The agreement of the action spectrum with the absorption spectrum of DNA points towards the formation of
166: 862:(Chloasma) - Patchy hyperpigmentation of the skin Normal number of melanocytes with increased melanin production causing hyperpigmentation. Associated with pregnancy or oral contraceptive pill use. 475:, the layer under the skin, from damage by UV radiation. The color of the melanin is black, allowing it to absorb a majority of the UV light and block it from passing through the epidermis. 1622:
Plonka PM, Passeron T, Brenner M, Tobin DJ, Shibahara S, Thomas A, Slominski A, Kadekaro AL, Hershkovitz D, Peters E, Nordlund JJ, Abdel-Malek Z, Takeda K, Paus R, Ortonne JP, Hearing VJ,
822:). There is additionally evidence that melanocyte stem cells are present in cutaneous nerves, with nerve signals causing these cells to differentiate into melanocytes for the skin. 916: 656:
In addition to presenting antigen, one of the roles of melanocytes in the immune response is cytokine production. Melanocytes express many proinflammatory cytokines including
911: 842: 610:. Although melanocytes are dendritic in form and share many characteristics with dendritic cells, they derive from different cell lineages. Dendritic cells are derived from 1297:
Tadokoro, Taketsugu; Yamaguchi, Yuji; Batzer, Jan; Coelho, Sergio G.; Zmudzka, Barbara Z.; Miller, Sharon A.; Wolber, Rainer; Beer, Janusz Z.; Hearing, Vincent J. (2005).
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to name some. In all, already 17 types of oculocutaneous albinism have been recognized. Each gene is related to different protein having a role in pigment production.
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Montoliu L, Grønskov K, Wei AH, Martínez-García M, Fernández A, Arveiler B, Morice-Picard F, Riazuddin S, Suzuki T, Ahmed ZM, Rosenberg T, Li W (January 2014).
707:, but they use their dendrites to interact with cells in other layers, and to capture pathogens that enter the epidermis. They likely work in concert with both 467:. This melanogenesis leads to a long-lasting pigmentation, which is in contrast to the pigmentation that originates from oxidation of already-existing melanin. 308: 411:
to induce pigmentation. Thus darker skin tones have more melanosomes present than lighter skin tones. Functionally, melanin serves as protection against
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will trigger melanogenesis and cause the melanocyte to produce melanosomes, which are then transferred by dendrites to the top layer of keratinocytes.
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Nichols SE, Reams WM (March 1960). "The occurrence and morphogenesis of melanocytes in the connective tissues of the PET/MCV mouse strain".
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Gasque P, Jaffar-Bandjee MC (October 2015). "The immunology and inflammatory responses of human melanocytes in infectious diseases".
856:- Normal number of melanocytes, but decreased melanin production due to decreased tyrosinase activity or defective tyrosine transport 1114: 67: 1675:
Mackintosh JA (July 2001). "The antimicrobial properties of melanocytes, melanosomes and melanin and the evolution of black skin".
315: 574: 677: 1856:"Enhancement of DNA repair in human skin cells by thymidine dinucleotides: evidence for a p53-mediated mammalian SOS response" 523: 1774:
Tapia CV, Falconer M, Tempio F, Falcón F, López M, Fuentes M, Alburquenque C, Amaro J, Bucarey SA, Di Nardo A (July 2014).
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Cramer SF (February 1991). "The origin of epidermal melanocytes. Implications for the histogenesis of nevi and melanomas".
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Millington GW (May 2006). "Proopiomelanocortin (POMC): the cutaneous roles of its melanocortin products and receptors".
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Parrish JA, Jaenicke KF, Anderson RR (August 1982). "Erythema and melanogenesis action spectra of normal human skin".
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Theriault LL, Hurley LS (October 1970). "Ultrastructure of developing melanosomes in C57 black and pallid mice".
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is clearly seen following the polymerization to melanin, the color of the pigment ranges from red to dark brown.
622:. As such, although morphologically and functionally similar, melanocytes and dendritic cells are not the same. 291: 279: 946: 611: 2066: 2071: 1103:
Mayeaux EJ, Cox JT, et al. (American Society for Colposcopy and Cervical Pathology) (2011-12-28).
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typically have a very low level of melanin production. Albinism is often but not always related to the
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Abdel-Malek Z, Scott MC, Suzuki I, Tada A, Im S, Lamoreux L, Ito S, Barsh G, Hearing VJ (2000-01-01).
296: 2061: 1867: 1684: 1104: 865: 760: 756: 657: 645:, and melanocytes. Importantly, melanocytes stimulated by cytokines express surface proteins such as 1299:"Mechanisms of Skin Tanning in Different Racial/Ethnic Groups in Response to Ultraviolet Radiation" 901: 870: 498:
Both lightly and darkly pigmented skin contain similar numbers of melanocytes, with difference in
472: 2020: 1623: 1549: 1279: 1036: 853: 733: 536: 368: 1056:"The Effects of Genotype and Cell Environment on Melanoblast Differentiation in the House Mouse" 2012: 1983: 1944: 1895: 1836: 1797: 1756: 1700: 1657: 1595: 1541: 1390: 1372: 1328: 1320: 1271: 1236: 1201: 1166: 1139: 1110: 1085: 1028: 993: 906: 837: 807: 767: 488: 2045: 2039: 2004: 1975: 1934: 1926: 1885: 1875: 1828: 1787: 1776:"Melanocytes and melanin represent a first line of innate immunity against Candida albicans" 1746: 1736: 1692: 1647: 1639: 1587: 1531: 1380: 1362: 1310: 1263: 1228: 1193: 1075: 1067: 1020: 680:. Like other immune cells, melanocytes secrete these cytokines in response to activation of 499: 352: 175: 113: 1219:
Agar N, Young AR (April 2005). "Melanogenesis: a photoprotective response to DNA damage?".
969: 771: 712: 58: 850:- Decreased number of melanocytes due to autoimmune destruction causing decreased melanin 1966:
Ito S (June 2003). "The IFPCS presidential lecture: a chemist's view of melanogenesis".
1871: 1688: 964: 427: 1939: 1914: 1751: 1724: 1652: 1627: 1385: 1350: 1267: 1080: 1055: 815: 799: 700: 646: 591: 348: 344: 1351:"Was skin cancer a selective force for black pigmentation in early hominin evolution?" 1011:
Barden H, Levine S (June 1983). "Histochemical observations on rodent brain melanin".
2055: 2048: – Histology Learning System at Boston University - "Integument: pigmented skin" 2008: 1979: 1890: 1855: 1643: 1315: 1298: 1197: 1024: 882: 811: 729: 669: 665: 661: 416: 2024: 1283: 637:, is found only on "professional" antigen presenting cells such as dendritic cells, 1832: 1553: 1040: 890: 779: 745: 716: 708: 634: 626: 619: 595: 578: 511: 460: 408: 340: 234: 1816: 1232: 284: 1817:"The melanocortin-1 receptor is a key regulator of human cutaneous pigmentation" 1071: 803: 630: 615: 519: 412: 1860:
Proceedings of the National Academy of Sciences of the United States of America
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enzyme. Tyrosinase is required for melanocytes to produce melanin from the
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and ACTH peptides that are produced from the precursor proopiomelanocortin.
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is a skin disease where people lack melanin in certain areas in the skin.
522:. Pigmentation including tanning is under hormonal control, including the 1792: 1775: 847: 831: 607: 551: 529: 372: 89: 1536: 1519: 859: 599: 479: 444: 392: 336: 254: 95: 44: 1452: 321: 1854:
Eller MS, Maeda T, Magnoni C, Atwal D, Gilchrest BA (November 1997).
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in addition to MHC class II, allowing for co-stimulation of T cells.
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Cichorek M, Wachulska M, Stasiewicz A, Tymińska A (February 2013).
1496: 1430: 1408: 554:. Albinism may be caused by a number of other genes as well, like 434: 426: 380: 267: 1520:"Increasing the complexity: new genes and new types of albinism" 806:. In adults, stem cells are contained in the bulge area of the 685: 456: 388: 376: 360: 244: 577:
have a buildup of melanin granules due to abnormal function of
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to be sentinels against harmful pathogens. They reside in the
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Mintz B (1971). "Clonal basis of mammalian differentiation".
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Through a process called melanogenesis, melanocytes produce
1344: 1342: 782:. When ultraviolet rays penetrate the skin and damage DNA, 217: 205: 196: 190: 184: 155: 143: 134: 119: 128: 1725:"Skin Immune Landscape: Inside and Outside the Organism" 1355:
Proceedings of the Royal Society B: Biological Sciences
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List of human cell types derived from the germ layers
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are organized as a cap protecting the nucleus of the
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List of distinct cell types in the adult human body
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Melanocytic tumors of uncertain malignant potential
302: 290: 278: 266: 261: 250: 240: 228: 181: 178: 122: 116: 107: 102: 82: 1159:Journal of Embryology and Experimental Morphology 1132:Symposia of the Society for Experimental Biology 986:Archives of Pathology & Laboratory Medicine 618:. Melanocytes on the other hand originate from 8: 1915:"Skin melanocytes: biology and development" 786:dinucleotide (pTpT) fragments from damaged 695:Melanocytes are ideally positioned in the 439:Micrograph of melanocytes in the epidermis 88: 1938: 1889: 1879: 1791: 1750: 1740: 1651: 1535: 1384: 1366: 1314: 1079: 68:Learn how and when to remove this message 1723:Abdallah F, Mijouin L, Pichon C (2017). 719:, to contribute to the immune response. 927: 625:Melanocytes are capable of expressing 415:. Melanocytes also have a role in the 319: 79: 1997:Clinical and Experimental Dermatology 1718: 1716: 1714: 1617: 1615: 1613: 1611: 1609: 1573: 1571: 1569: 1567: 1565: 1563: 1109:. Lippincott Williams & Wilkins. 7: 1524:Pigment Cell & Melanoma Research 1303:Journal of Investigative Dermatology 1106:Modern Colposcopy Textbook and Atlas 1054:Markert CL, Silvers WK (May 1956). 770:that package the chemical inside a 407:which can be transported to nearby 27:Melanin-producing cells of the skin 1919:Postepy Dermatologii I Alergologii 1268:10.1111/j.1751-1097.1982.tb04362.x 715:, both of which are also actively 502:due to differences the packing of 447:, which is a pigment found in the 55:improve coverage for other species 25: 347:located in the bottom layer (the 2009:10.1111/j.1365-2230.2006.02128.x 1980:10.1034/j.1600-0749.2003.00037.x 1644:10.1111/j.1600-0625.2009.00912.x 1316:10.1111/j.0022-202x.2005.23760.x 606:; and production and release of 316:Anatomical terms of microanatomy 174: 112: 34: 1499:. National Institutes of Health 1477:. National Institutes of Health 1455:. National Institutes of Health 1433:. National Institutes of Health 1411:. National Institutes of Health 1256:Photochemistry and Photobiology 1833:10.1034/j.1600-0749.13.s8.28.x 1677:Journal of Theoretical Biology 970:Merriam-Webster.com Dictionary 834:- Cancer affecting melanocytes 598:capabilities; presentation of 57:and discuss this issue on the 1: 1309:(6). Elsevier BV: 1326–1332. 682:Pattern Recognition Receptors 485:cyclobutane pyrimidine dimers 478:Since the action spectrum of 1233:10.1016/j.mrfmmm.2004.11.016 1198:10.1016/0012-1606(70)90098-9 1025:10.1016/0361-9230(83)90218-6 755:(ACTH) is elevated, such as 431:Illustration of a melanocyte 1349:Greaves, Mel (2014-04-22). 753:adrenocorticotropic hormone 535:People with oculocutaneous 2093: 1592:10.1016/j.jinf.2015.06.006 743: 703:, the lowest layer of the 633:. The other class of MHC, 395:primarily responsible for 355:, the middle layer of the 2046:Histology image: 08103loa 2040:Histology image: 07903loa 1729:Mediators of Inflammation 1072:10.1093/genetics/41.3.429 802:of the melanocyte is the 585:Role in the immune system 314: 87: 49:excessively human-centric 1881:10.1073/pnas.94.23.12627 1632:Experimental Dermatology 1580:The Journal of Infection 612:hematopoietic stem cells 575:Chédiak–Higashi syndrome 1931:10.5114/pdia.2013.33376 1013:Brain Research Bulletin 947:Oxford University Press 688:(TLR4) which recognize 594:: branched morphology; 1697:10.1006/jtbi.2001.2331 1368:10.1098/rspb.2013.2955 440: 432: 1968:Pigment Cell Research 1821:Pigment Cell Research 1186:Developmental Biology 943:UK English Dictionary 826:Clinical significance 438: 430: 1742:10.1155/2017/5095293 686:Toll Like Receptor 4 391:. Melanin is a dark 1872:1997PNAS...9412627E 1827:(Suppl 8): 156–62. 1689:2001JThBi.211..101M 902:Mole (skin marking) 871:Nevus depigmentosus 43:This article about 1793:10.1093/mmy/myu026 1626:(September 2009). 1537:10.1111/pcmr.12167 1361:(1781): 20132955. 973:. Merriam-Webster. 838:Melanocytic tumors 734:indole-5,6-quinone 620:neural crest cells 441: 433: 369:vaginal epithelium 297:H2.00.03.0.01016 1221:Mutation Research 907:Tanning activator 808:outer root sheath 761:Cushing's disease 489:direct DNA damage 330: 329: 325: 78: 77: 70: 16:(Redirected from 2084: 2077:Epithelial cells 2028: 1991: 1953: 1952: 1942: 1910: 1904: 1903: 1893: 1883: 1866:(23): 12627–32. 1851: 1845: 1844: 1812: 1806: 1805: 1795: 1780:Medical Mycology 1771: 1765: 1764: 1754: 1744: 1720: 1709: 1708: 1672: 1666: 1665: 1655: 1619: 1604: 1603: 1575: 1558: 1557: 1539: 1515: 1509: 1508: 1506: 1504: 1493: 1487: 1486: 1484: 1482: 1471: 1465: 1464: 1462: 1460: 1449: 1443: 1442: 1440: 1438: 1427: 1421: 1420: 1418: 1416: 1405: 1399: 1398: 1388: 1370: 1346: 1337: 1336: 1318: 1294: 1288: 1287: 1251: 1245: 1244: 1216: 1210: 1209: 1181: 1175: 1174: 1154: 1148: 1147: 1127: 1121: 1120: 1100: 1094: 1093: 1083: 1051: 1045: 1044: 1008: 1002: 1001: 981: 975: 974: 961: 955: 954: 949:. Archived from 932: 766:Melanosomes are 713:Langerhans cells 543:gene coding the 351:) of the skin's 322:edit on Wikidata 224: 223: 220: 219: 216: 211: 210: 207: 204: 201: 198: 195: 192: 189: 186: 183: 180: 171: 170: 169: 168: 161: 158: 157: 154: 149: 148: 145: 142: 139: 136: 133: 130: 127: 124: 121: 118: 92: 80: 73: 66: 62: 38: 37: 30: 21: 2092: 2091: 2087: 2086: 2085: 2083: 2082: 2081: 2052: 2051: 2036: 2031: 1994: 1965: 1961: 1959:Further reading 1956: 1912: 1911: 1907: 1853: 1852: 1848: 1814: 1813: 1809: 1773: 1772: 1768: 1722: 1721: 1712: 1674: 1673: 1669: 1624:Schallreuter KU 1621: 1620: 1607: 1577: 1576: 1561: 1517: 1516: 1512: 1502: 1500: 1495: 1494: 1490: 1480: 1478: 1473: 1472: 1468: 1458: 1456: 1451: 1450: 1446: 1436: 1434: 1429: 1428: 1424: 1414: 1412: 1407: 1406: 1402: 1348: 1347: 1340: 1296: 1295: 1291: 1253: 1252: 1248: 1227:(1–2): 121–32. 1218: 1217: 1213: 1183: 1182: 1178: 1156: 1155: 1151: 1129: 1128: 1124: 1117: 1102: 1101: 1097: 1053: 1052: 1048: 1010: 1009: 1005: 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Index

Melanogenesis
biology
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melanin
/məˈlænəˌst,-n-/

/ˈmɛlənəˌst,-n-/
Precursor
Neural crest
Skin
Melanin
Latin
MeSH
D008544
TH
H2.00.03.0.01016
FMA
70545
Anatomical terms of microanatomy
edit on Wikidata
melanin
neural crest
cells
stratum basale
epidermis
eye
uvea

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