Effect and mechanism of muscle injury on liver lipid metabolism in Duchenne muscular dystrophy mice / 中国药科大学学报

@#Duchene muscular dystrophy (DMD) is a serious progressive muscular dystrophy.Reports in recent years about abnormal lipid in DMD patients have increased, yet little attention has been paid to liver lipid.This study aimed to explore the effect of dystrophin gene defect on liver lipid synthesis.7-week-old mdx male mice were used as DMD model.The conditions of liver function, liver lipid accumulation and liver lipid synthesis were determined through liver tissue morphological examination, blood biochemical examination, and detection of hepatic gene and protein expression.The results showed that lipid droplets in liver of mdx mice increased significantly.The contents of total cholesterol and triglyceride in liver, aspartate aminotransferase and alanine aminotransferase in serum increased.The gene and protein expression of hepatic lipid synthesis-related enzymes such as fatty acid synthase, acetyl CoA carboxylase, and sterol regulatory element binding protein 1-c were up-regulated.These results showed accumulation of liver lipid in 7-week-old mdx male mice.

Investigating one case of deletion of 27 exons espanding at rod domain of dystrophin gene in a Duchenne Muscular Dystrophy

A majority deletion of 27 exons expanding from 8-34 at rod domain of dystrophic gene was identified in a Duchene Muscular Dystrophy (DMD) patients. Polymerase chain reaction (PCR) was used to analyze the deletion. The deletion caused an out of frame mutation leading to nonsense mutation which early stops code in exon 35 of dystrophic gene. The DMD gene was analyzed at both genomic DNA and mRNA levels. Identification of deletion at mRNA level is very useful for rapid diagnosis of DMD patients and avoid missing some mutations that we can’t identify at DNA level