Abstract
Hair follicles are unique organs undergoing regular cycles of proliferation, differentiation, and apoptosis. The final step of apoptosis is, in general, mediated by executioner caspases comprising caspase-3, -6 and -7. Despite their commonly accepted apoptotic function, executioner caspases also participate in non-apoptotic processes. In the present study, we investigated activation (cleavage) of caspase-7 in mouse hair follicles and surrounding tissue during embryonic development into adulthood. Casp7 −/− mice were examined to understand the effect of caspase-7 deficiency in the skin. The activated form of caspase-7 was observed during embryonic hair follicle development, as well as in the first hair cycle. In general, activation of caspase-7 did not correlate with apoptosis and activation of caspase-3, except during physiological hair follicle regression. Notably, cleaved caspase-7 was observed in mast cells and its deficiency in the adult skin resulted in increased mast cell number. Our study shows for the first time activated caspase-7 in hair follicles and mast cells and indicates its non-apoptotic roles in the skin.
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Acknowledgments
Recent research in Brno labs runs under the Centre of Excellence of the Grant Agency of the Czech Republic (14-37368G). International cooperation with UK was granted by Academy of Science of the CR (M200451201). The IAPG labs are financed from the RVO 67985904.
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Vesela, B., Svandova, E., Berghe, T.V. et al. Non-apoptotic role for caspase-7 in hair follicles and the surrounding tissue. J Mol Hist 46, 443–455 (2015). https://doi.org/10.1007/s10735-015-9636-1
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DOI: https://doi.org/10.1007/s10735-015-9636-1