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Mitochondrial dysfunction in human immunodeficiency virus-1 transgenic mouse cardiac myocytes.

Publication ,  Journal Article
Cheung, JY; Gordon, J; Wang, J; Song, J; Zhang, X-Q; Prado, FJ; Shanmughapriya, S; Rajan, S; Tomar, D; Tahrir, FG; Gupta, MK; Knezevic, T ...
Published in: J Cell Physiol
April 2019

The pathophysiology of human immunodeficiency virus (HIV)-associated cardiomyopathy remains uncertain. We used HIV-1 transgenic (Tg26) mice to explore mechanisms by which HIV-related proteins impacted on myocyte function. Compared to adult ventricular myocytes isolated from nontransgenic (wild type [WT]) littermates, Tg26 myocytes had similar mitochondrial membrane potential (ΔΨ m ) under normoxic conditions but lower Δ Ψ m after hypoxia/reoxygenation (H/R). In addition, Δ Ψ m in Tg26 myocytes failed to recover after Ca 2+ challenge. Functionally, mitochondrial Ca 2+ uptake was severely impaired in Tg26 myocytes. Basal and maximal oxygen consumption rates (OCR) were lower in normoxic Tg26 myocytes, and further reduced after H/R. Complex I subunit and ATP levels were lower in Tg26 hearts. Post-H/R, mitochondrial superoxide (O 2•- ) levels were higher in Tg26 compared to WT myocytes. Overexpression of B-cell lymphoma 2-associated athanogene 3 (BAG3) reduced O 2•- levels in hypoxic WT and Tg26 myocytes back to normal. Under normoxic conditions, single myocyte contraction dynamics were similar between WT and Tg26 myocytes. Post-H/R and in the presence of isoproterenol, myocyte contraction amplitudes were lower in Tg26 myocytes. BAG3 overexpression restored Tg26 myocyte contraction amplitudes to those measured in WT myocytes post-H/R. Coimmunoprecipitation experiments demonstrated physical association of BAG3 and the HIV protein Tat. We conclude: (a) Under basal conditions, mitochondrial Ca 2+ uptake, OCR, and ATP levels were lower in Tg26 myocytes; (b) post-H/R, Δ Ψ m was lower, mitochondrial O 2•- levels were higher, and contraction amplitudes were reduced in Tg26 myocytes; and (c) BAG3 overexpression decreased O 2•- levels and restored contraction amplitudes to normal in Tg26 myocytes post-H/R in the presence of isoproterenol.

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Published In

J Cell Physiol

DOI

EISSN

1097-4652

Publication Date

April 2019

Volume

234

Issue

4

Start / End Page

4432 / 4444

Location

United States

Related Subject Headings

  • Ventricular Function, Left
  • Signal Transduction
  • Reactive Oxygen Species
  • Oxygen Consumption
  • Oxidative Stress
  • Oxidation-Reduction
  • Myocytes, Cardiac
  • Myocardial Contraction
  • Mitochondria, Heart
  • Mice, Transgenic
 

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Cheung, J. Y., Gordon, J., Wang, J., Song, J., Zhang, X.-Q., Prado, F. J., … Feldman, A. M. (2019). Mitochondrial dysfunction in human immunodeficiency virus-1 transgenic mouse cardiac myocytes. J Cell Physiol, 234(4), 4432–4444. https://doi.org/10.1002/jcp.27232
Cheung, Joseph Y., Jennifer Gordon, JuFang Wang, Jianliang Song, Xue-Qian Zhang, Fabian Jana Prado, Santhanam Shanmughapriya, et al. “Mitochondrial dysfunction in human immunodeficiency virus-1 transgenic mouse cardiac myocytes.J Cell Physiol 234, no. 4 (April 2019): 4432–44. https://doi.org/10.1002/jcp.27232.
Cheung JY, Gordon J, Wang J, Song J, Zhang X-Q, Prado FJ, et al. Mitochondrial dysfunction in human immunodeficiency virus-1 transgenic mouse cardiac myocytes. J Cell Physiol. 2019 Apr;234(4):4432–44.
Cheung, Joseph Y., et al. “Mitochondrial dysfunction in human immunodeficiency virus-1 transgenic mouse cardiac myocytes.J Cell Physiol, vol. 234, no. 4, Apr. 2019, pp. 4432–44. Pubmed, doi:10.1002/jcp.27232.
Cheung JY, Gordon J, Wang J, Song J, Zhang X-Q, Prado FJ, Shanmughapriya S, Rajan S, Tomar D, Tahrir FG, Gupta MK, Knezevic T, Merabova N, Kontos CD, McClung JM, Klotman PE, Madesh M, Khalili K, Feldman AM. Mitochondrial dysfunction in human immunodeficiency virus-1 transgenic mouse cardiac myocytes. J Cell Physiol. 2019 Apr;234(4):4432–4444.
Journal cover image

Published In

J Cell Physiol

DOI

EISSN

1097-4652

Publication Date

April 2019

Volume

234

Issue

4

Start / End Page

4432 / 4444

Location

United States

Related Subject Headings

  • Ventricular Function, Left
  • Signal Transduction
  • Reactive Oxygen Species
  • Oxygen Consumption
  • Oxidative Stress
  • Oxidation-Reduction
  • Myocytes, Cardiac
  • Myocardial Contraction
  • Mitochondria, Heart
  • Mice, Transgenic