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Protective effects of glutamine on human melanocyte oxidative stress model
Indian J Dermatol Venereol Leprol ; 2018 May; 84(3): 269-274
Article | IMSEAR | ID: sea-192368
ABSTRACT

Background:

Vitiligo is a disorder caused by the loss of the melanocyte activity on melanin pigment generation. Studies show that oxidative-stress induced apoptosis in melanocytes is closely related to the pathogenesis of vitiligo. Glutamine is a well known antioxidant with anti-apoptotic effects, and is used in a variety of diseases. However, it is unclear whether glutamine has an antioxidant or anti-apoptotic effect on melanocytes.

Aims:

The aim of this study was to investigate the protective effects of glutamine on a human melanocyte oxidative stress model.

Methods:

The oxidative stress model was established on human melanocytes using hydrogen peroxide. The morphology and viability of melanocytes, levels of oxidants [reactive oxygen species and malondialdehyde], levels of antioxidants [superoxide dismutase and glutathione-S-transferase], and apoptosis-related indicators (caspase-3, bax and bcl-2) were examined after glutamine exposure at various concentrations. Expressions of nuclear factor-E2-related factor 2, heme oxygenase-1, and heat shock protein 70 were detected using western blot technique after glutamine exposure at various concentrations.

Results:

Our results demonstrate that pre-treatment and post-treatment with glutamine promoted melanocyte viability, increased levels of superoxide dismutase, glutathione-S-transferase and bcl-2, decreased levels of reactive oxygen species, malondialdehyde, bax and caspase-3, and enhanced nuclear factor-E2-related factor 2, heme oxygenase-1, and heat shock protein 70 expression in a dose dependent manner. The effect of pre-treatment was more significant than post-treatment, at the same concentration.

Limitations:

The mechanisms of glutamine activated nuclear factor-E2-related factor 2 antioxidant responsive element signaling pathway need further investigation.

Conclusions:

Glutamine enhances the antioxidant and anti-apoptotic capabilities of melanocytes and protects them against oxidative stress.

Full text: Available Index: IMSEAR (South-East Asia) Journal: Indian J Dermatol Venereol Leprol Year: 2018 Type: Article

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Full text: Available Index: IMSEAR (South-East Asia) Journal: Indian J Dermatol Venereol Leprol Year: 2018 Type: Article