Heart saves muscle

Heart saves muscle
Muscle cell architecture looks normal in transgenic mice that lack ACTA1 but express human ACTC. Credit: Nowak, K.J., et al. 2009. J. Cell Biol. doi:10.1083/jcb.200812132

A heart muscle protein can replace its missing skeletal muscle counterpart to give mice with myopathy a long and active life, show Nowak et al. The findings will be published online on Monday, May 25, 2009 and will appear in the June 1, 2009 print issue of the Journal of Cell Biology.

The contraction machinery protein, actin, exists in different forms in the adult and skeletal muscles. The heart form, ACTC, is also the dominant form in skeletal muscle of the . But during development, the skeletal form, ACTA1, increases in production and by birth has taken over. It is not clear why the switch occurs, or why it doesn't occur in the heart, but it happens in every higher vertebrate and, for that reason, has been considered vitally important.

to the ACTA1 gene cause a rare but serious myopathy. Most patients die within the first year of life and some are born almost completely paralyzed. Mice lacking ACTA1 die nine days after birth. Nowak et al. wondered if ACTC could compensate for a lack of ACTA1. The two proteins differ only slightly but, like the developmental switch in production, this difference is conserved across species. Many researchers therefore assumed such compensation would never work.

But it did. Nowak and colleagues crossed Acta1 mutant mice with that express human ACTC at high levels in cells. The resulting mice didn't die at nine days. In fact, almost all of them (93.5%) survived more than three months, and some more than two years. The mice's locomotor performance was comparable with wild-type, as was their overall muscle strength (though individual muscle fibers were slightly weaker), and their endurance was actually higher—they ran faster and for longer.

This begs the question, Why do we even have ACTA1? Besides pondering that, Nowak and colleagues are also working out how to boost endogenous ACTC as a possible therapy for ACTA1-lacking patients.

More information: Nowak, K.J., et al. 2009. J. Cell Biol. doi:10.1083/jcb.200812132, www.jcb.org

Source: Rockefeller University (news : web)

Citation: Heart saves muscle (2009, May 25) retrieved 28 March 2024 from https://phys.org/news/2009-05-heart-muscle.html
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