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Published on: May 24, 2016
Pentoxifylline fails to attenuate fibrosis in dystrophic (mdx) diaphragm muscle
Luc E Gosselin1, Jacqueline E Williams
1Department of Exercise and Nutrition Sciences, 405 Kimball Tower, University at Buffalo, Buffalo, New York 14214, USA. gosselin@buffalo.edu
Abstract:
Fibrosis is a common pathological feature observed in muscle from patients with Duchenne muscular dystrophy and in mdx diaphragm. The purpose of this study was to determine whether pentoxifylline (PTX) treatment for 4 weeks (16 mg/kg/day) could significantly attenuate the process of fibrosis in diaphragm muscle from mdx mice. PTX treatment had no impact on in vitro diaphragm muscle contractile function. In addition, diaphragm muscle hydroxyproline concentration and the level of type I and III collagen and TGF-beta1 mRNA were unaffected by PTX treatment. These findings do not support the use of PTX as an antifibrotic drug for the treatment of muscular dystrophy.
Insights
Pentoxifylline (PTX) did not reduce fibrosis in mdx mouse diaphragm muscle. This study found no improvement in muscle function or collagen levels, suggesting PTX is not effective for treating muscular dystrophy fibrosis.
Area of Science:
- Muscle physiology and pathology
- Pharmacological interventions for genetic disorders
Background:
- Fibrosis is a key pathological feature in Duchenne muscular dystrophy (DMD) and mdx mouse models.
- Diaphragm muscle is significantly affected by fibrosis in these conditions.
Purpose of the Study:
- To investigate the antifibrotic effects of pentoxifylline (PTX) in the diaphragm muscle of mdx mice.
- To assess the impact of PTX on fibrosis, collagen levels, and muscle function.
Main Methods:
- MDX mice were treated with PTX (16 mg/kg/day) for 4 weeks.
- Diaphragm muscle fibrosis was evaluated by measuring hydroxyproline concentration and collagen type I and III mRNA levels.
- In vitro contractile function of the diaphragm muscle was assessed.
Main Results:
- PTX treatment did not significantly alter diaphragm muscle hydroxyproline concentration.
- Levels of type I and III collagen mRNA and TGF-beta1 mRNA remained unaffected by PTX.
- In vitro contractile function of the diaphragm muscle was not improved by PTX treatment.
Conclusions:
- Pentoxifylline (PTX) does not attenuate fibrosis in the diaphragm muscle of mdx mice.
- The drug did not impact key markers of fibrosis or muscle function.
- These findings do not support the use of PTX as an antifibrotic therapy for muscular dystrophy.

