Human keratin 8 mutations that disturb filament assembly observed in inflammatory bowel disease patients

D. W. Owens, N. J. Wilson, A. J. M. Hill, E. L. Rugg, R. M. Porter, A. M. Hutcheson, R. A. Quinlan, D. van Heel, M. Parkes, D. P. Jewell, S. S. Campbell, S. Ghosh, J. Satsangi, E. B. Lane

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    Abstract

    We have identified miss-sense mutations in keratin 8 in a subset of patients with inflammatory bowel disease (Crohn disease and ulcerative colitis). Inflammatory bowel diseases are a group of disorders that are polygenic in origin and involve intestinal epithelial breakdown. We investigated the possibility that these keratin mutations might contribute to the course of the disease by adversely affecting the keratin filament network that provides mechanical support to cells in epithelia. The mutations (Gly62 to Cys, Ile63 to Val and Lys464 to Asn) all lie outside the major mutation hotspots associated with severe disease in epidermal keratins, but using a combination of in vitro and cell culture assays we show that they all have detrimental effects on K8/K18 filament assembly in vitro and in cultured cells. The G62C mutation also gives rise to homodimer formation on oxidative stress to cultured intestinal epithelial cells, and homodimers are known to be polymerization incompetent. Impaired keratin assembly resulting from the K8 mutations found in some inflammatory bowel disease patients would be predicted to affect the maintenance and re-establishment of mechanical resilience in vivo, as required during keratin cytoskeleton remodeling in cell division and differentiation, which may lead to epithelial fragility in the gut. Simple epithelial keratins may thus be considered as candidates for genes contributing to a risk of inflammatory bowel disease.
    Original languageEnglish
    Pages (from-to)1989-1999
    Number of pages11
    JournalJournal of Cell Science
    Volume117
    Issue number10
    DOIs
    Publication statusPublished - Apr 2004

    Keywords

    • Inflammatory bowel disease
    • K8 mutations
    • Chromosome 12q
    • IBD2
    • Crohn disease
    • Ulcerative colitis

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    Owens, D. W., Wilson, N. J., Hill, A. J. M., Rugg, E. L., Porter, R. M., Hutcheson, A. M., Quinlan, R. A., van Heel, D., Parkes, M., Jewell, D. P., Campbell, S. S., Ghosh, S., Satsangi, J., & Lane, E. B. (2004). Human keratin 8 mutations that disturb filament assembly observed in inflammatory bowel disease patients. Journal of Cell Science, 117(10), 1989-1999. https://doi.org/10.1242/jcs.01043