Mitophagy and mitochondrial morphology in human melanoma-derived cells post exposure to simulated sunlight.

Abstract:

PURPOSE:To assess changes in mitochondrial morphology and mitophagy induced by simulated sunlight irradiation (SSI) and how these changes are modulated by mitochondrial activity and energy source. MATERIALS AND METHODS:Human malignant amelanotic melanoma A375 cells were pre-treated with either a mitochondrial activity enhancer, uncoupler or were either melanin or glutamine supplemented/starved for 4 hours pre-exposure to sunlight. A Q-Sun Solar Simulator (Q-Lab, Homestead, FL, USA) was employed to expose cells to simulated sunlight. Confocal microscopy imaging of A375 cells co-loaded with mitochondria and lysosome-specific fluorescent dyes was used to identify these organelles and predict mitophagic events. RESULTS:SSI induces pronounced changes in mitochondrial dynamics and mitophagy in exposed skin cells compared to control and these effects were modified by both glutamine and melanin. CONCLUSIONS:Mitochondrial dynamics and rate of mitophagy in melanoma cells are sensitive to even short bursts of environmentally relevant SSI. Mitochondrial dynamics, and its modulation, may also play a role in mitophagy regulation, cell survival and proliferation post SSI.

journal_name

Int J Radiat Biol

authors

Zanchetta LM,Garcia A,Lyng F,Walsh J,Murphy JE

doi

10.3109/09553002.2011.556175

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

506-17

issue

5

eissn

0955-3002

issn

1362-3095

journal_volume

87

pub_type

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