Keratin 8

Keratin 8
Keratin 8
Symbols KRT8; CARD2; CK8; CYK8; K2C8; K8; KO
External IDs OMIM148060 MGI96705 HomoloGene55643 GeneCards: KRT8 Gene
Species Human Mouse
Entrez 3856 16691
Ensembl ENSG00000170421 ENSMUSG00000049382
UniProt P05787 P11679
RefSeq (mRNA) NM_002273.3 NM_031170.2
RefSeq (protein) NP_002264.1 NP_112447.2
Location (UCSC) Chr 12:
53.29 – 53.3 Mb
Chr 15:
101.83 – 101.83 Mb
PubMed search [1] [2]

Keratin, type I cytoskeletal 8 also known as cytokeratin-8 (CK-8) or keratin-8 (K8) is a keratin protein that in human is encoded by the KRT8 gene. It is often paired with keratin 18.


Utility as an immunohistochemical stain

Antibodies to CK8 (e.g. CAM 5.2) can be used to differentiate lobular carcinoma of the breast from ductal carcinoma of the breast.[1]

Keratin 8 is often used together with keratin 18 and keratin 19 to differentiate cells of epithelial origin from hematopoietic cells in tests that enumerate circulating tumor cells in blood [2].


Keratin 8 has been shown to interact with MAPK14,[3] Pinin[4] and PPL.[5]

See also


  1. ^ Moriya T, Kasajima A, Ishida K, et al. (March 2006). "New trends of immunohistochemistry for making differential diagnosis of breast lesions". Med Mol Morphol 39 (1): 8–13. doi:10.1007/s00795-006-0309-8. PMID 16575508. 
  2. ^ W. Jeffrey Allard, Jeri Matera, M. Craig Miller, et al. (October 2004). "Tumor Cells Circulate in the Peripheral Blood of All Major Carcinomas but not in Healthy Subjects or Patients With Nonmalignant Diseases". Clin. Cancer Research 10 (20): 6897–6904. doi:10.1158/1078-0432.CCR-04-0378. PMID 15501967. 
  3. ^ Ku, Nam-On; Azhar Salman, Omary M Bishr (Mar. 2002). "Keratin 8 phosphorylation by p38 kinase regulates cellular keratin filament reorganization: modulation by a keratin 1-like disease causing mutation". J. Biol. Chem. (United States) 277 (13): 10775–82. doi:10.1074/jbc.M107623200. ISSN 0021-9258. PMID 11788583. 
  4. ^ Shi, J; Sugrue S P (May. 2000). "Dissection of protein linkage between keratins and pinin, a protein with dual location at desmosome-intermediate filament complex and in the nucleus". J. Biol. Chem. (UNITED STATES) 275 (20): 14910–5. doi:10.1074/jbc.275.20.14910. ISSN 0021-9258. PMID 10809736. 
  5. ^ Kazerounian, Shideh; Uitto Jouni, Aho Sirpa (Oct. 2002). "Unique role for the periplakin tail in intermediate filament association: specific binding to keratin 8 and vimentin". Exp. Dermatol. (Denmark) 11 (5): 428–38. doi:10.1034/j.1600-0625.2002.110506.x. ISSN 0906-6705. PMID 12366696. 

Further reading

  • Moll R, Franke WW, Schiller DL, et al. (1983). "The catalog of human cytokeratins: patterns of expression in normal epithelia, tumors and cultured cells.". Cell 31 (1): 11–24. doi:10.1016/0092-8674(82)90400-7. PMID 6186379. 
  • Ljubimov AV, Bartek J, Couchman JR, et al. (1992). "Distribution of individual components of basement membrane in human colon polyps and adenocarcinomas as revealed by monoclonal antibodies.". Int. J. Cancer 50 (4): 562–6. doi:10.1002/ijc.2910500412. PMID 1371500. 
  • Smedts F, Ramaekers F, Robben H, et al. (1990). "Changing patterns of keratin expression during progression of cervical intraepithelial neoplasia". Am. J. Pathol. 136 (3): 657–68. PMC 1877502. PMID 1690513. 
  • Krauss S, Franke WW (1990). "Organization and sequence of the human gene encoding cytokeratin 8". Gene 86 (2): 241–9. doi:10.1016/0378-1119(90)90285-Y. PMID 1691124. 
  • Yamamoto R, Kao LC, McKnight CE, Strauss JF (1990). "Cloning and sequence of cDNA for human placental cytokeratin 8. Regulation of the mRNA in trophoblastic cells by cAMP". Mol. Endocrinol. 4 (3): 370–4. doi:10.1210/mend-4-3-370. PMID 1692965. 
  • Waseem A, Alexander CM, Steel JB, Lane EB (1991). "Embryonic simple epithelial keratins 8 and 18: chromosomal location emphasizes difference from other keratin pairs". New Biol. 2 (5): 464–78. PMID 1705144. 
  • Tsubura A, Okada H, Sasaki M, et al. (1991). "Immunohistochemical demonstration of keratins 8 and 14 in benign tumours of the skin appendage". Virchows Archiv. A, Pathological anatomy and histopathology 418 (6): 503–7. doi:10.1007/BF01606500. PMID 1711732. 
  • Leube RE, Bosch FX, Romano V, et al. (1987). "Cytokeratin expression in simple epithelia. III. Detection of mRNAs encoding human cytokeratins nos. 8 and 18 in normal and tumor cells by hybridization with cDNA sequences in vitro and in situ". Differentiation 33 (1): 69–85. PMID 2434381. 
  • Guelstein VI, Tchypysheva TA, Ermilova VD, et al. (1988). "Monoclonal antibody mapping of keratins 8 and 17 and of vimentin in normal human mammary gland, benign tumors, dysplasias and breast cancer". Int. J. Cancer 42 (2): 147–53. doi:10.1002/ijc.2910420202. PMID 2456993. 
  • Osborn M, Mazzoleni G, Santini D, et al. (1988). "Villin, intestinal brush border hydrolases and keratin polypeptides in intestinal metaplasia and gastric cancer; an immunohistologic study emphasizing the different degrees of intestinal and gastric differentiation in signet ring cell carcinomas". Virchows Archiv. A, Pathological anatomy and histopathology 413 (4): 303–12. doi:10.1007/BF00783022. PMID 2459839. 
  • Fisher HP, Doppl W, Osborn M, Altmannsberger M (1989). "Evidence for a hepatocellular lineage in a combined hepatocellular-cholangiocarcinoma of transitional type". Virchows Arch., B, Cell Pathol. 56 (2): 71–6. PMID 2467436. 
  • Kulesh DA, Ceceña G, Darmon YM, et al. (1989). "Posttranslational regulation of keratins: degradation of mouse and human keratins 18 and 8". Mol. Cell. Biol. 9 (4): 1553–65. PMC 362572. PMID 2471065. 
  • Gel'shteĭn VI, Chipysheva TA, Ermilova VD, Bannikov GA (1990). "[The expression of keratins Nos. 8, 17 and vimentin in pleomorphic adenoma of the salivary glands]". Arkh. Patol. 51 (10): 28–35. PMID 2482017. 
  • Eichbaum QG, Beatty DW, Parker MI (1994). "Identification of cardiac autoantigens in human heart cDNA libraries using acute rheumatic fever sera". J. Autoimmun. 7 (2): 243–61. doi:10.1006/jaut.1994.1019. PMID 8037842. 
  • Maruyama K, Sugano S (1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298. 
  • Ku NO, Omary MB (1997). "Phosphorylation of human keratin 8 in vivo at conserved head domain serine 23 and at epidermal growth factor-stimulated tail domain serine 431". J. Biol. Chem. 272 (11): 7556–64. doi:10.1074/jbc.272.11.7556. PMID 9054461. 
  • Ji H, Reid GE, Moritz RL, et al. (1997). "A two-dimensional gel database of human colon carcinoma proteins". Electrophoresis 18 (3–4): 605–13. doi:10.1002/elps.1150180344. PMID 9150948. 
  • Liao J, Ku NO, Omary MB (1997). "Stress, apoptosis, and mitosis induce phosphorylation of human keratin 8 at Ser-73 in tissues and cultured cells". J. Biol. Chem. 272 (28): 17565–73. doi:10.1074/jbc.272.28.17565. PMID 9211903. 
  • Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, et al. (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149. 

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