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An ischemic β-dystroglycan (βDG) degradation: Correlation with irreversible injuiry in adult rabbit cardiomyocytes

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Abstract

A loss of sarcolemmal dystrophin was observed by immuno-fluorescence studies in rabbit hearts subjected to in situ myocardial ischemia and by immuno-blotting of the Triton soluble membrane fraction of isolated rabbit cardiomyocytes subjected to in vitro ischemia. This ischemic loss of dystrophin was a specific event in that no ischemic loss of sarcolemmal α-sarcoglycan, γ-sarcoglycan, αDG, or βDG was observed. The maintenance of sarcolemmal βDG (43 Kd) during ischemia was interesting in that dystrophin binds to the C-terminus of βDG. However, during late in vitro ischemia, a 30 Kd band was observed that was immuno-reactive for βDG. Additionally, this 30 Kd-βDG band was observed in rabbit myocardium subjected to autolysis. Finally, the 30 Kd-βDG was observed in the purified sarcolemmal fraction of rabbit cardiomyocytes subjected to a prolonged period of in vitro ischemia, confirming the sarcolemmal localization of this band. The potential patho-physiologic significance of this band was indicated by the appearance of this band at 120–180 min of in vitro ischemia, directly correlating with the onset of irreversible injury, as manifested by osmotic fragility. Additionally the appearance of this band was significantly reduced by the endogenous cardioprotective mechanism, in vitro ischemic preconditioning, which delays the onset of osmotic fragility. In addition to dystrophin, βDG binds caveolin-3 and Grb-2 at its C-terminus. The presence of Grb-2 and caveolin-3 in the membrane fractions of oxygenated and ischemic cardiomyocytes was determined by Western blotting. An increase in the level of membrane Grb-2 and caveolin-3 was observed following ischemic preconditioning as compared to control cells. The formation of this 30 Kd-βDG degradation product is potentially related to the transition from the reversible to the irreversible phase of myocardial ischemic cell injury and a decrease in 30 Kd-βDG might mediate the cardioprotection provided by ischemic preconditioning.

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Authors and Affiliations

  1. Departments of Pathology, Veterans Administration Hospital and East Tennessee State University, Johnson City, TN, 37614, USA

    Stephen C. Armstrong, Carole A. Latham & Charles E. Ganote

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  2. Carole A. Latham
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  3. Charles E. Ganote
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Armstrong, S.C., Latham, C.A. & Ganote, C.E. An ischemic β-dystroglycan (βDG) degradation: Correlation with irreversible injuiry in adult rabbit cardiomyocytes. Mol Cell Biochem 242, 71–79 (2003). https://doi.org/10.1023/A:1021185627968

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