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Keratin intermediate filaments in the colon: guardians of epithelial homeostasis

Polari, Lauri; Alam, Catharina M.; Nystr�m, Joel H.; Heikkil�, Taina; Tayyab, Mina; Baghestani, Sarah; Toivola, Diana M.


Lauri Polari

Joel H. Nystr�m

Taina Heikkil�

Mina Tayyab

Sarah Baghestani

Diana M. Toivola


Keratin intermediate filament proteins are major cytoskeletal components of the mammalian simple layered columnar epithelium in the gastrointestinal tract. Human colon crypt epithelial cells express keratins 18, 19 and 20 as the major type I keratins, and keratin 8 as the type II keratin. Keratin expression patterns vary between species, and mouse colonocytes express keratin 7 as a second type II keratin. Colonic keratin patterns change during cell differentiation, such that K20 increases in the more differentiated crypt cells closer to the central lumen. Keratins provide a structural and mechanical scaffold to support cellular stability, integrity and stress protection in this rapidly regenerating tissue. They participate in central colonocyte processes including barrier function, ion transport, differentiation, proliferation and inflammatory signaling. The cell-specific keratin compositions in different epithelial tissues has allowed for the utilization of keratin-based diagnostic methods. Since the keratin expression pattern in tumors often resembles that in the primary tissue, it can be used to recognize metastases of colonic origin. This review focuses on recent findings on the biological functions of mammalian colon epithelial keratins obtained from pivotal in vivo models. We also discuss the diagnostic value of keratins in chronic colonic disease and known keratin alterations in colon pathologies. This review describes the biochemical properties of keratins and their molecular actions in colonic epithelial cells and highlights diagnostic data in colorectal cancer and inflammatory bowel disease patients, which may facilitate the recognition of disease subtypes and the establishment of personal therapies in the future.

Journal Article Type Review
Acceptance Date Oct 29, 2020
Online Publication Date Nov 2, 2020
Publication Date 2020-12
Deposit Date May 6, 2022
Publicly Available Date May 6, 2022
Journal The International Journal of Biochemistry & Cell Biology
Print ISSN 1357-2725
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 129
Article Number 105878
Keywords keratin, intermediate filament, inflammatory bowel disease, cytoskeleton, mouse model, cancer diagnostics
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