The Anti-photoaging Effects of Pre- and Post-treatment of Platelet-rich Plasma on UVB-damaged HaCaT Keratinocytes

Platelet-rich plasma (PRP) has seen wide clinical use owing to its regenerative and repair abilities. Objective: To investigate the anti-photoaging effects of pre- and post-treatment of PRP on UVB-damaged HaCaT cells. Methods: HaCaT cells were irradiated with 80 mJ/cm(2) UVB, before or after PRP treatment (1000 x 10(7)/L), and following measurements were taken: survival rate of UVB-irradiated HaCaT cells, malondialdehyde (MDA) content and activities of glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) and catalase (CAT). Western blot was used to determine the effect of different PRP intervention on the expression of PI3K, AKT, ERK, MMP-1, MMP-9, TIMP-1 and gamma-H2AX in the UVB-irradiated HaCaT cells. Results: pre- and post-PRP treatment reduced MDA content and increased the activities of GSH-Px, SOD and CAT in photoaged HaCaT cells. These changes resulted in reduced cytotoxic effects. Besides, different PRP intervention promoted cell proliferation via PI3K/AKT pathway. Furthermore, PRP application suppressed the expression of gamma-H2AX. Also, PRP intervention alleviated photoaging effects by upregulating the expression level of tissue inhibitor of metalloproteinases-1 (TIMP-1) while downregulating matrix metalloproteinase (MMP) expression level in photoaged HaCaT cells. Conclusion: pre- and post-PRP treatment play anti-photoaging role through strengthening cellular oxidative defense capacity, mitigating MMP expression, alleviating DNA damages and promoting proliferation of UVB-irradiated HaCaT cells.

Automated summary

The study demonstrated that pre- and post-treatment of PRP could reduce MDA content and increase antioxidant enzyme activities in UVB-damaged HaCaT cells. Additionally, PRP intervention promoted cell proliferation via PI3K/AKT pathway, suppressed the expression of gamma-H2AX, upregulated TIMP-1 expression while downregulating MMP expression levels in photoaged HaCaT cells, ultimately playing an anti-photoaging role.