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T Lymphocyte Regulation of Lysyl Oxidase in Diet-Induced Cardiac Fibrosis

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Abstract

Left ventricular diastolic dysfunction is an important predictor of prognosis and mortality of heart failure. Increased left ventricular stiffness can be associated with excessive myocardial fibrosis and increased cross-linked collagen by the enzyme lysyl oxidase (LOX). These cardiac extracellular matrix (ECM) remodeling processes are affected by T-lymphocyte function and phenotype. We sought to examine the role of T lymphocytes in myocardial LOX regulation in diet-induced fibrotic hearts. Female SCID mice, devoid of functional T lymphocytes, and wild-type (WT) C57BL/6 were treated with a high-fat high-simple carbohydrate (HFHSC) diet for 12 months. HFHSC-fed WT mice demonstrated a significant increase in the catalytic activity of myocardial LOX compared with respective controls. These changes coincided with a marked increase in ECM collagen cross-linking and impaired diastolic filling pattern. However, induction of LOX was minimal in the SCID mice compared with the WT group. Correspondingly fibrillar cross-linked collagen concentrations and diastolic dysfunction were less prominent in the SCID mice compared with the WT group. Our results suggest a role for T lymphocytes in this dietary induction of diastolic dysfunction through modulation of LOX-dependent collagen maturation.

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Acknowledgments

This study was supported in part by grants from NCCAM R21 AT004177 and Wallace Research Foundation to RRW, and R01 HL079206 from NIH to DFL. The authors would like to thank to Felina Cordova and Gayle Bentley at the University of Arizona for their assistance in this project.

Conflict of interest statement

The authors declared no conflict of interest.

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Authors and Affiliations

  1. Sarver Heart Center, College of Medicine, The University of Arizona, Tucson, AZ, 85724, USA

    Sherma Zibadi, Randy Vazquez, Douglas F. Larson & Ronald R. Watson

  2. Division of Health Promotion Sciences, Mel and Enid Zuckerman Arizona College of Public Health, The University of Arizona, Tucson, AZ, 85724, USA

    Sherma Zibadi & Ronald R. Watson

  3. Department of Nutritional Sciences, The University of Arizona, Tucson, AZ, 85721, USA

    Randy Vazquez

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  1. Sherma Zibadi
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Correspondence to Ronald R. Watson.

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Zibadi, S., Vazquez, R., Larson, D.F. et al. T Lymphocyte Regulation of Lysyl Oxidase in Diet-Induced Cardiac Fibrosis. Cardiovasc Toxicol 10, 190–198 (2010). https://doi.org/10.1007/s12012-010-9078-7

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  • DOI: https://doi.org/10.1007/s12012-010-9078-7

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