Loss of Calpain 3 Proteolytic Activity Leads to Muscular Dystrophy and to Apoptosis-Associated Iκbα/Nuclear Factor κb Pathway Perturbation in Mice

نویسندگان

  • Isabelle Richard
  • Carinne Roudaut
  • Sylvie Marchand
  • Stephen Baghdiguian
  • Muriel Herasse
  • Daniel Stockholm
  • Yasuko Ono
  • Laurence Suel
  • Nathalie Bourg
  • Hiroyuki Sorimachi
  • Gérard Lefranc
  • Michel Fardeau
  • Alain Sébille
  • Jacques S. Beckmann
چکیده

Calpain 3 is known as the skeletal muscle-specific member of the calpains, a family of intracellular nonlysosomal cysteine proteases. It was previously shown that defects in the human calpain 3 gene are responsible for limb girdle muscular dystrophy type 2A (LGMD2A), an inherited disease affecting predominantly the proximal limb muscles. To better understand the function of calpain 3 and the pathophysiological mechanisms of LGMD2A and also to develop an adequate model for therapy research, we generated capn3-deficient mice by gene targeting. capn3-deficient mice are fully fertile and viable. Allele transmission in intercross progeny demonstrated a statistically significant departure from Mendel's law. capn3-deficient mice show a mild progressive muscular dystrophy that affects a specific group of muscles. The age of appearance of myopathic features varies with the genetic background, suggesting the involvement of modifier genes. Affected muscles manifest a similar apoptosis-associated perturbation of the IkappaBalpha/nuclear factor kappaB pathway as seen in LGMD2A patients. In addition, Evans blue staining of muscle fibers reveals that the pathological process due to calpain 3 deficiency is associated with membrane alterations.

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عنوان ژورنال:
  • The Journal of Cell Biology

دوره 151  شماره 

صفحات  -

تاریخ انتشار 2000