Effect of low molecular weight substance extracted from chick embryo on mitochondrial DNA deletion in aging mice induced by D-galactose / 中华老年医学杂志

ABSTRACT

Objective To investigate the effect of low molecular weight substance extracted from chick embryo on mitochondrial DNA(mtDNA)deletion in senile mice induced bv D-galactose.Methods Senile mice induced by D-galactose were treated with low molecular weight substance extracted from chick embryo.The deleted fragment of mtDNA was examined by using polymerase chain reaction technique and agarose gel electrophoresis.A relative quantitation of band densities was performed by using densitometry scanning techniques.The deletion was identified by using direct sequencing analysis. Results The 4239 bD mtDNA deletion were present in liver,cerebral cortex and hippocampus tissues in all of the mice.and it was significantly higher in senile model mice than in control mice(all P＜0.01).Low molecular weight substance extracted from chick embryo reduced the mtDNA deletion in various tissues in senile model mice(all P＜0.05).Deletion was more abundant in liver than in cerebral cortex and hippoeampus. Conclusions The 4239 bp mtDNA deletion is a common deletion,and low molecular weight substance extracted from chick embryo could decrease the incidence of 4239 bD mtDNA deletion.