Abstract
The silk protein sericin has been identified as a potent antioxidant and photoprotective agent against ultraviolet B (UVB) irradiation in mouse skin model. In this study, we have investigated the anti-apoptotic effect of sericin in UVB (30 mJ/cm2)-irradiated human keratinocytes. Flow cytometry analysis has shown that pre-treatment with sericin inhibits UVB-induced apoptosis. The pre-treatment with sericin suppresses bax expression, up-regulates the expression of bcl-2, prevents both the activation of caspase-3 and cleavage of Poly (ADP-ribose) polymerase. Generation of intracellular hydrogen peroxide in UVB-treated keratinocytes is inhibited through pre-treatment with sericin suggesting that sericin probably prevents mitochondrial damage.
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Abbreviations
- ROS:
-
Reactive oxygen species
- UVB:
-
Ultraviolet B
- MTT:
-
Thiazolyl tetrazolium compound
- H2O2 :
-
Hydrogen peroxide
- DHR 123:
-
Dihydrorhodamine 123
- PARP:
-
Poly (ADP-ribose) polymerase
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Acknowledgments
The authors express gratitude to Dr. Gautam Banerjee, Hindustan Lever Limited, India, for his constant support for preparation of the manuscript. This work was financially supported by the Department of Science and Technology, Department of Biotechnology, Council for Scientific and Industrial Research, New Delhi. We are thankful to Directorate of Sericulture, Midnapore District, West Bengal State, and Central Silk Board, Bangiriposi, Orissa State, for providing the silk cocoons. R.D. also wishes to thank CSIR for fellowship.
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Dash, R., Mandal, M., Ghosh, S.K. et al. Silk sericin protein of tropical tasar silkworm inhibits UVB-induced apoptosis in human skin keratinocytes. Mol Cell Biochem 311, 111–119 (2008). https://doi.org/10.1007/s11010-008-9702-z
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DOI: https://doi.org/10.1007/s11010-008-9702-z