RESUMO
Objective: To explore the effect of KangXin oral solution on brain mitochondrial DNA(mtDNA) deletion mutation in aged Balb/c mice.Methods: The Balb/c mice were divided into the young group(6weeks),middle-aged group(6months) and aged group(14 months),each group has 10 mice.Brain mtDNA were obtained and polymerase chain reaction(PCR) technique was used to examine the fragment deletion of brain mtDNA,thus,to confi rm there was deletion of mtDNA in aged mice,s brain.The aged Balb/c mice were divided into two groups: the aged blank control group being given 0.9% normal sodium,KangXin oral solution group.After being treated for four months,the brain mtDNA were obtained and polymerase chain reaction(PCR) technique was used to amplify wild-type and deletion from of mtDNA.Gel imaging meter was used to detect optical density,then,to compare the optical density ratios of deletion from mtDNA/ wide type mtDNA in two groups.Results: There were 304bp mtDNA deletion in brain mitochondrial of aged Balb/c mice,but same mtDNA deletions were not detected in brain mitochondrial of young and middle-aged mice.Compared with aged blank control group,the mtDNA deletion of aged Balb/c mice in KangXin oral solution group decreased obviously(P〈0.001).Conclusion: mtDNA deletion mutation accumulates with the increase of age.KangXin oral solution can inhibit mtDNA deletion of aged mice.