Myogenesis in dysferlin-deficient myoblasts is inhibited by an intrinsic inflammatory response
- 作者：Tatiana V. Cohen ; Jonathan E. Cohen ; Terence A. Partridge ; tpartridge@cnmcresearch.org
- 关键词：Muscular dystrophy ; Inflammation ; Thunder of God Vine ; MyoD ; p65/RelA ; Immortomouse ; Muscle culture
- 刊名：Neuromuscular Disorders
- 出版年：2012
- 期刊代码：203_09608966
- 类别：med
- 出版时间：July, 2012
- 卷：22
- 期：7
- 页码：648-658
- 文件大小：944 K
摘要
Limb-girdle muscular dystrophy type 2B results from mutations in dysferlin, a membrane-associated protein involved in cellular membrane repair. Primary myoblast cultures derived from dysferlinopathy patients show reduced myogenic potential, suggesting that dysferlin may regulate myotube fusion and be required for muscle regeneration. These observations contrast with the findings that muscle develops normally in pre-symptomatic dysferlinopathy patients. To better understand the role of dysferlin in myogenesis, we investigated this process in vitro using cells derived from two mouse models of dysferlinopathy: SJL/J and A/J mice. We observed that myotubes derived from dysferlin-deficient muscle were of significantly smaller diameters, contained fewer myonuclei, and displayed reduced myogenic gene expression compared to dysferlin-sufficient cells. Together, these findings suggest that the absence of dysferlin from myoblasts is detrimental to myogenesis. Pro-inflammatory NF魏B signaling was upregulated in dysferlin-deficient myotubes; the anti-inflammatory agent celastrol reduced the NF魏B activation and improved myogenesis in dysferlin-deficient cultures. The results suggest that decreased myotube fusion in dysferlin deficiency is attributable to intrinsic inflammatory activation and can be improved using anti-inflammatory mediators.