Small heat-shock protein Hsp20 attenuates β-agonist-mediated cardiac remodeling through apoptosis signal-regulating kinase 1

Guo Chang Fan, Qunying Yuan, Guojie Song, Yigang Wang, Guoli Chen, Jiang Qian, Xiaoyang Zhou, Yong J. Lee, Muhammad Ashraf, Evangelia G. Kranias

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Chronic stimulation of the β-adrenergic neurohormonal axis contributes to the progression of heart failure and mortality in animal models and human patients. In cardiomyocytes, activation of the β-adrenergic pathway has been shown to result in transiently increased expression of a cardiac small heat-shock protein Hsp20. The present study shows that cardiac overexpression (10-fold) of Hsp20 may protect the heart against β-agonist-induced cardiac remodeling, associated with isoproterenol (50 μg/g per day) infusion for 14 days. Hsp20 attenuated the cardiac hypertrophic response, markedly reduced interstitial fibrosis, and decreased apoptosis. Contractility was also preserved in hearts with increased Hsp20 levels. These beneficial effects were associated with attenuation of the ASK1-JNK/p38 (apoptosis signal-regulating kinase 1/c-Jun NH2-terminal kinase/p38) signaling cascade triggered by isoproterenol, whereas there was no difference in either extracellular signal-related kinase 1/2 or Akt activation. Parallel in vitro experiments supported the inhibitory role of Hsp20 on enforced ASK1-JNK/p38 activation in both H9c2 cells and adult rat cardiomyocytes. Immunostaining studies also demonstrated that Hsp20 colocalizes with ASK1 in cardiomyocytes. Taken together, our findings indicate that (1) β-agonist-induced cardiac injury is associated with activation of the ASK1-JNK/p38 cascade; (2) increased expression of Hsp20 attenuates the induction of remodeling, dysfunction, and apoptosis in response to sustained β-adrenergic stimulation; and (3) the beneficial effects of Hsp20 are at least partially attributable to inhibition of the ASK1-signaling cascade.

Original languageEnglish (US)
Pages (from-to)1233-1242
Number of pages10
JournalCirculation research
Volume99
Issue number11
DOIs
StatePublished - Nov 1 2006

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MAP Kinase Kinase Kinase 5
Small Heat-Shock Proteins
JNK Mitogen-Activated Protein Kinases
Cardiac Myocytes
Adrenergic Agents
Isoproterenol
Apoptosis
Fibrosis
Phosphotransferases
Animal Models
Heart Failure
Mortality
Wounds and Injuries

Keywords

  • Apoptosis
  • Apoptosis signal-regulating kinase 1 (ASK1)
  • Small heat-shock protein Hsp20
  • β-adrenergic receptor

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Small heat-shock protein Hsp20 attenuates β-agonist-mediated cardiac remodeling through apoptosis signal-regulating kinase 1. / Fan, Guo Chang; Yuan, Qunying; Song, Guojie; Wang, Yigang; Chen, Guoli; Qian, Jiang; Zhou, Xiaoyang; Lee, Yong J.; Ashraf, Muhammad; Kranias, Evangelia G.

In: Circulation research, Vol. 99, No. 11, 01.11.2006, p. 1233-1242.

Research output: Contribution to journalArticle

Fan, Guo Chang ; Yuan, Qunying ; Song, Guojie ; Wang, Yigang ; Chen, Guoli ; Qian, Jiang ; Zhou, Xiaoyang ; Lee, Yong J. ; Ashraf, Muhammad ; Kranias, Evangelia G. / Small heat-shock protein Hsp20 attenuates β-agonist-mediated cardiac remodeling through apoptosis signal-regulating kinase 1. In: Circulation research. 2006 ; Vol. 99, No. 11. pp. 1233-1242.
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AU - Fan, Guo Chang

AU - Yuan, Qunying

AU - Song, Guojie

AU - Wang, Yigang

AU - Chen, Guoli

AU - Qian, Jiang

AU - Zhou, Xiaoyang

AU - Lee, Yong J.

AU - Ashraf, Muhammad

AU - Kranias, Evangelia G.

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N2 - Chronic stimulation of the β-adrenergic neurohormonal axis contributes to the progression of heart failure and mortality in animal models and human patients. In cardiomyocytes, activation of the β-adrenergic pathway has been shown to result in transiently increased expression of a cardiac small heat-shock protein Hsp20. The present study shows that cardiac overexpression (10-fold) of Hsp20 may protect the heart against β-agonist-induced cardiac remodeling, associated with isoproterenol (50 μg/g per day) infusion for 14 days. Hsp20 attenuated the cardiac hypertrophic response, markedly reduced interstitial fibrosis, and decreased apoptosis. Contractility was also preserved in hearts with increased Hsp20 levels. These beneficial effects were associated with attenuation of the ASK1-JNK/p38 (apoptosis signal-regulating kinase 1/c-Jun NH2-terminal kinase/p38) signaling cascade triggered by isoproterenol, whereas there was no difference in either extracellular signal-related kinase 1/2 or Akt activation. Parallel in vitro experiments supported the inhibitory role of Hsp20 on enforced ASK1-JNK/p38 activation in both H9c2 cells and adult rat cardiomyocytes. Immunostaining studies also demonstrated that Hsp20 colocalizes with ASK1 in cardiomyocytes. Taken together, our findings indicate that (1) β-agonist-induced cardiac injury is associated with activation of the ASK1-JNK/p38 cascade; (2) increased expression of Hsp20 attenuates the induction of remodeling, dysfunction, and apoptosis in response to sustained β-adrenergic stimulation; and (3) the beneficial effects of Hsp20 are at least partially attributable to inhibition of the ASK1-signaling cascade.

AB - Chronic stimulation of the β-adrenergic neurohormonal axis contributes to the progression of heart failure and mortality in animal models and human patients. In cardiomyocytes, activation of the β-adrenergic pathway has been shown to result in transiently increased expression of a cardiac small heat-shock protein Hsp20. The present study shows that cardiac overexpression (10-fold) of Hsp20 may protect the heart against β-agonist-induced cardiac remodeling, associated with isoproterenol (50 μg/g per day) infusion for 14 days. Hsp20 attenuated the cardiac hypertrophic response, markedly reduced interstitial fibrosis, and decreased apoptosis. Contractility was also preserved in hearts with increased Hsp20 levels. These beneficial effects were associated with attenuation of the ASK1-JNK/p38 (apoptosis signal-regulating kinase 1/c-Jun NH2-terminal kinase/p38) signaling cascade triggered by isoproterenol, whereas there was no difference in either extracellular signal-related kinase 1/2 or Akt activation. Parallel in vitro experiments supported the inhibitory role of Hsp20 on enforced ASK1-JNK/p38 activation in both H9c2 cells and adult rat cardiomyocytes. Immunostaining studies also demonstrated that Hsp20 colocalizes with ASK1 in cardiomyocytes. Taken together, our findings indicate that (1) β-agonist-induced cardiac injury is associated with activation of the ASK1-JNK/p38 cascade; (2) increased expression of Hsp20 attenuates the induction of remodeling, dysfunction, and apoptosis in response to sustained β-adrenergic stimulation; and (3) the beneficial effects of Hsp20 are at least partially attributable to inhibition of the ASK1-signaling cascade.

KW - Apoptosis

KW - Apoptosis signal-regulating kinase 1 (ASK1)

KW - Small heat-shock protein Hsp20

KW - β-adrenergic receptor

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