Recombinant MG53 Protein Modulates Therapeutic Cell Membrane Repair in Treatment of Muscular Dystrophy
Science Translational Medicine • 20 Jun 2012 • Vol 4, Issue 139 • p. 139ra85 • DOI: 10.1126/scitranslmed.3003921
Mending Muscle
To repair a torn muscle, one might require a little bit of ice and a lot of rest. For those with Duchenne muscular dystrophy (DMD), however, muscle degeneration is not as easily repaired, and patients ultimately experience difficulty standing, walking, and breathing. DMD results from a lack of the protein dystrophin, which is located at the cell membrane to help muscle fibers repair themselves. There is no cure for DMD, but Weisleder and colleagues have now shown that exogenous delivery of a different repair protein, Mitsugumin 53 (MG53), to cells can prevent muscle damage in cell culture and in mice.
The authors first showed that muscle and nonmuscle cells treated with recombinant human MG53 (rhMG53) in vitro were resistant to mechanical, chemical, and photo damage because MG53 localized to the injury site and provided protection. In vivo, Weisleder and colleagues showed that dystrophin-deficient mdx mice treated intramuscularly or intravenously with rhMG53 displayed reduced muscle damage and decreased muscle pathology compared to saline-treated controls, even in the presence of a membrane-damaging toxin. This repair process also worked in muscle fibers isolated from mdx mice that were deficient in either of two natural repair proteins, MG53 or dysferlin, suggesting that exogenous delivery of rhMG53 works by a new mechanism—other than the intracellular machinery—to patch up damaged cell membrane.
Soluble MG53 protein therapy could be a viable treatment for DMD that avoids the well-known limitations of dystrophin gene replacement therapy. Toward translation, Weisleder et al. have further demonstrated that exogenous MG53 is nontoxic and safe in animals. The ability of the protein to preserve muscle function and to enhance repair capacity in humans has yet to be shown, but additional studies in larger animals and human muscle fibers will give a clearer indication of its therapeutic potential.
Abstract
Mitsugumin 53 (MG53), a muscle-specific TRIM family protein, is an essential component of the cell membrane repair machinery. Here, we examined the translational value of targeting MG53 function in tissue repair and regenerative medicine. Although native MG53 protein is principally restricted to skeletal and cardiac muscle tissues, beneficial effects that protect against cellular injuries are present in nonmuscle cells with overexpression of MG53. In addition to the intracellular action of MG53, injury to the cell membrane exposes a signal that can be detected by MG53, allowing recombinant MG53 protein to repair membrane damage when provided in the extracellular space. Recombinant human MG53 (rhMG53) protein purified from Escherichia coli fermentation provided dose-dependent protection against chemical, mechanical, or ultraviolet-induced damage to both muscle and nonmuscle cells. Injection of rhMG53 through multiple routes decreased muscle pathology in the mdx dystrophic mouse model. Our data support the concept of targeted cell membrane repair in regenerative medicine, and present MG53 protein as an attractive biological reagent for restoration of membrane repair defects in human diseases.
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Supplementary Material
Summary
Fig. S1. Recombinant human MG53 (rhMG53) can be isolated by several different approaches.
Fig. S2. Maintenance of body weight in mdx mice injected with rhMG53.
Fig. S3. Diaphragm muscle from mdx mice shows improved histopathology after subcutaneous injection of rhMG53.
Fig. S4. Pharmacokinetic properties of MBP-MG53 in wild-type mice.
Movie S1. MG53 localizes to sites of membrane damage after mechanical disruption.
Movie S2. BSA cannot prevent dye entry after UV laser–induced membrane damage to mouse skeletal muscle.
Movie S3. rhMG53 can prevent dye entry after UV laser–induced membrane damage to skeletal muscle.
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Published In

Science Translational Medicine
Volume 4 | Issue 139
June 2012
June 2012
Copyright
Copyright © 2012, American Association for the Advancement of Science.
Submission history
Received: 22 February 2012
Accepted: 11 May 2012
Acknowledgments
We thank Zelgen-Biopharm for their assistance in developing methodology for the scale-up production of recombinant MG53 proteins. Funding: This work was supported by grants from the NIH to N.W. (AR063084) and J.M. (AG015556, HL069000, and AR061385), a developmental grant from the Jain Foundation and an NIH Small Business Innovation Research grant (AR060019) to TRIM-edicine, and the Tissue Analytic Services Shared Resource of The Cancer Institute of New Jersey (P30CA072720). Author contributions: N.W., X.W., and J.M. developed the concept for the studies. N.W. and J.M. designed the experiments. N.T., P.L., M.T., T.T., C.F., R.Y., P.-J.C., X.Z., and M.H. participated in production of recombinant MG53 proteins. N.W., N.T., C.F., and P.-J.C. developed methods to measure rhMG53 in cell-based assays. N.T., X.W., C. Cao, Y.Z., P.L., H.Z., P.-J.C., M.S., C. Cai, H.C., H.T., and R.-P.X. performed in vitro assays of MG53 function. N.W., N.T., T.T., C.F., H.Z., R.Y., X.Z., and H.T. performed in vivo assays. N.T., T.T., and R.Y. performed the toxicological assessments. N.W. and J.M. wrote the manuscript. Competing interests: N.W. and J.M. have an equity interest in TRIM-edicine, which develops rhMG53 for treatment of human diseases. Patents on the use of rhMG53 are held by the University of Medicine and Dentistry of New Jersey. Data and materials availability: Access to rhMG53 protein can be obtained from TRIM-edicine Inc. after establishment of a Material Transfer Agreement.
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