Effect of MMP-2 gene silencing on radiation-induced DNA damage in human normal dermal fibroblasts and breast cancer cells

Genes and Environment : the Official Journal of the Japanese Environmental Mutagen Society
Gugalavath ShailenderRama Rao Malla

Abstract

Diagnostic and therapeutic ionizing radiation (IR) is one of the well known long term risk factors of breast cancer. Extremely lethal consequences of IR causes double-strand breaks, which are mainly responsible for genomic instability, altered gene expression, and cell death. This study evaluated the effect of matrix metalloproteinases-2 (MMP-2) gene silencing using MMP-2 shRNA expression plasmids (pMMP-2) on IR induced cytotoxicity and DNA damage by MTT, dead green, γH2AX and comet assays in human normal dermal fibroblasts (HDFs) and MCF-7 human breast cancer cells. IR has decreased the viability of HDFs and MCF-7 cells with increasing IR (2-10Gy). IR induced DNA damage in both HDFs and MCF-7 cells. However, pMMP-2 transfection has increased the viability of irradiated HDFs (10Gy) and significantly decreased the viability of irradiated MCF-7 cells (10Gy). Further, DNA damage in terms of γH2AX foci decreased with pMMP-2 transfection in irradiated HDFs (10Gy) and increased in irradiated MCF-7 cells (10Gy). In addition, MMP-2 gene silencing using pMMP-2 decreased comet tail length in irradiated HDFs but increased in irradiated MCF-7 cells. The results conclude that pMMP-2 has protected HDFs and sensitized the MCF-7 cells from IR ...Continue Reading

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Citations

Jan 11, 2020·Frontiers in Oncology·Saray Quintero-FabiánMaría Elizbeth Alvarez-Sánchez

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Methods Mentioned

BETA
transfection
X-ray
ELISA
electrophoresis
phase
phase contrast

Software Mentioned

CASP Lab
Image J

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