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Cathepsin K knockout alleviates aging-induced cardiac dysfunction.

Yinan Hua1, Timothy J Robinson, Yongtao Cao

  • 1Division of Pharmaceutical Sciences & Center for Cardiovascular Research and Alternative Medicine, School of Pharmacy, College of Health Sciences, Laramie, WY, 82071, USA.

Aging Cell
|February 19, 2015
PubMed
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Cathepsin K knockout alleviates age-related cardiac decline by reducing apoptosis and senescence in aging hearts. This genetic intervention preserves cardiac function and structure in aged mice.

Area of Science:

  • Cardiovascular Biology
  • Aging Research
  • Molecular Cardiology

Background:

  • Aging is a primary risk factor for cardiovascular disease.
  • Elevated cathepsin K levels are observed in failing hearts.
  • Genetic deletion of cathepsin K protects against cardiac hypertrophy and dysfunction.

Purpose of the Study:

  • To investigate the role of cathepsin K in age-dependent cardiac dysfunction.
  • To determine if cathepsin K knockout mitigates age-related cardiac decline.

Main Methods:

  • Echocardiography for cardiac geometry and function.
  • Fura-2 technique for intracellular Ca(2+) handling.
  • Immunohistochemistry, Western blot, and TUNEL staining for apoptosis and senescence markers.
  • In vitro studies using H9c2 cells.
Keywords:
agingapoptosiscardiac functioncardiac hypertrophycardiac remodelingcathepsin K

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Main Results:

  • Aged mice showed cardiac remodeling, reduced contractility, and impaired Ca(2+) handling compared to young mice.
  • Cathepsin K knockout attenuated age-related cardiac remodeling and functional decline.
  • Cathepsin K knockout reduced markers of senescence and cardiomyocyte apoptosis.
  • Cathepsin K inhibition blocked mitochondrial apoptosis-inducing factor nuclear translocation.

Conclusions:

  • Cathepsin K knockout ameliorates age-associated cardiac dysfunction.
  • The protective effect involves suppression of both caspase-dependent and independent apoptosis.
  • Targeting cathepsin K may offer a therapeutic strategy for age-related heart disease.