Increase of mtDNA number and its mutant copies in rat brain after exposure to 150 MeV protons.

Abstract:

:Proton beam therapy is widely used for treating brain tumor. Despite the efficacy of treatment, the use of this therapy has met some limitations associated with possible damage to normal brain tissues located beyond the tumor site. In this context, the exploration of the harmful effects of protons on the normal brain tissues is of particular interest. We have investigated changes in the total mitochondrial DNA (mtDNA) copy number and identified mtDNA mutant copies in three brain regions (the hippocampus, cortex and cerebellum) of rats after irradiation their whole-head with 150 MeV protons at doses of 3 and 5 Gy. The study was performed in 2-months old male Spraque Dawley rats (n = 5 each group). The mtDNA copy numbers were determined by real-time PCR. The level of mtDNA heteroplasmy was estimated using Surveyor nuclease technology. Our results show that after head exposure to protons, levels of mtDNA copy number in three rat brain regions increase significantly as the levels of mtDNA mutant copies increase. The most significant elevation is observed in the hippocampus. In conclusion, an increase in mtDNA mutant copies may contribute to mitochondrial dysfunction accompanied by increased oxidative stress in different brain regions and promote the development of neurodegenerative diseases and the induction of carcinogenesis.

journal_name

Mol Biol Rep

authors

Abdullaev S,Bulanova T,Timoshenko G,Gaziev AI

doi

10.1007/s11033-020-05491-7

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

4815-4820

issue

6

eissn

0301-4851

issn

1573-4978

pii

10.1007/s11033-020-05491-7

journal_volume

47

pub_type

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