Ms. Jin Zhang Profile

Jin Zhang

at Univ of Bath

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Proceedings Article | 9 November 2010 Paper

Light induced heme oxygenase 1 is suppressed by Bach1 in human skin keratinocytes

Ruoqi Xu, Wanqian Liu, Jin Zhang, Li Yang, Linhong Deng, Rex Tyrrell, Julia Li Zhong

Proceedings Volume 7845, 78450Z (2010) https://doi.org/10.1117/12.870984

KEYWORDS: Proteins, Skin, Cell death, Antimony, Lithium, Ultraviolet radiation, Resistance, Modulation, Tissues, Injuries

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Ultraviolet A (UVA) radiation is an oxidizing agent that strongly induces the heme oxygenase 1(HO-1) expression in cultured human skin fibroblasts, but weakly induces it in skin keratinocytes. Here, we report that low basal levels of HO- 1 and much higher basal levels of HO-2 protein were observed in keratinocytes compared with fibroblasts. Silencing of Bach1 strongly increased HO-1 levels in HaCaT transformed keratinocytes and these HO-1 levels were not further increased by either UVA irradiation or silencing of HO-2. This is consistent with the conclusion that high constitutive levels of HO-2 expression in keratinocytes are responsible for the resistance of these cells to HO-1 induction by UVA radiation and that Bach1 plays a predominant role in influencing the lack of HO-1 expression in keratinocytes. Bach1 inhibition reduced the 500 kJ/m² UVA-induced cell damage by LDH membrane integrity and MTS viability assays. These results suggest that Bach1 inhibition protect against high dose of UVA irradiation induced damage in keratinocytes.

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