Abstract
Human RSa cells are highly sensitive to apoptotic-like cell death by ultraviolet irradiation (UV) while UVr-1 cells are their variant with an increased resistance to UV. Three days after UV at 10 J/m2, the viability of RSa cells was approximately 17% while that of UVr-1 cells was 65%. This different survival might reflect apoptotic cell death since apoptosis-specific DNA ladder was more clearly observed in RSa cells than in UVr-1 cells after UV. Addition of ALLN/calpain inhibitor I to the culture medium after UV resulted in similar survival (14–18%) between RSa and UVr-1 cells. Immunoblot analysis showed down-regulation of protein kinase CΘ, Src, Bax and μ-calpain after UV was more prominent in UVr-1 than in RSa cells. Activated μ-calpain appeared within 1 h post-UV only in UVr-1 cells. The expression of calpastatin, a specific endogenous inhibitor of calpain, was higher in RSa than in UVr-1 cells. To further examine the role of calpain in UV-induced cell death, cDNA of human calpastatin was transfected into UVr-1 cells. The results showed that overexpression of calpastatin suppressed down-regulation of Src, μ-calpain and Bax. Concomitantly, colony survival after UV was reduced in calpastatin-transfected cells as compared to vector control cells. Our results suggest that activation of calpain might account for, at least in part, the lower susceptibility to UV-induced cell death in UVr-1 cells. Cell Death and Differentiation (2000) 7, 531–537
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Abbreviations
- ALLN/calpain inhibitor I:
-
N-acetyl-Leu-Leu-norleucinal
- DMSO:
-
dimethylsulfoxide
- MTT:
-
3-(4,5-dimethylthiozol-2-yl)-2,5-diphenyltetrazolium bromide
- SAPK:
-
stress-activated protein kinase
- UV:
-
ultraviolet irradiation
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Acknowledgements
This work was supported in part by a Grant-in-Aid from Tokyo Biochemical Research Foundation, grants from the Smoking Research Foundation, ‘Ground Research for Space Utilization’ promoted by NASDA and Japan Space Forum, and a Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Science, Sports and Culture of Japan.
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Hiwasa, T., Arase, Y., Kikuno, K. et al. Increase in ultraviolet sensitivity by overexpression of calpastatin in ultraviolet-resistant UVr-1 cells derived from ultraviolet-sensitive human RSa cells. Cell Death Differ 7, 531–537 (2000). https://doi.org/10.1038/sj.cdd.4400685
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DOI: https://doi.org/10.1038/sj.cdd.4400685
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