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SOCS-1 inhibits TNF-alpha-induced cardiomyocyte apoptosis via ERK1/2 pathway activation

Ling Yan1, Qizhu Tang, Difei Shen

  • 1Department of Cardiology, Renmin Hospital of Wuhan University School of Medicine, 238 JieFang Road, Wuchang, Wuhan 430060, People's Republic of China.

Inflammation
|March 12, 2008
PubMed

Insights

Suppressor of cytokine signaling-1 (SOCS-1) protects cardiomyocytes from tumor necrosis factor-alpha (TNF-alpha)-induced apoptosis. SOCS-1 achieves this by activating the extracellular signal-regulated kinase 1 and 2 (ERK1/2) pathway, offering a potential therapeutic target for cardiovascular diseases.

Area of Science:

  • Cardiovascular Biology
  • Molecular Cell Biology
  • Immunology

Background:

  • Tumor necrosis factor-alpha (TNF-alpha), a proinflammatory cytokine, exacerbates cardiovascular diseases by activating mitogen-activated protein kinase (MAPK) pathways.
  • Suppressor of cytokine signaling-1 (SOCS-1) modulates TNF-alpha responses, but its role in TNF-alpha-induced cardiomyocyte apoptosis and underlying MAPK pathways remains unclear.

Purpose of the Study:

  • To investigate the role of SOCS-1 in preventing TNF-alpha-induced apoptosis in neonatal rat cardiomyocytes.
  • To elucidate the involvement of MAPK signaling pathways in SOCS-1-mediated protection against TNF-alpha-induced apoptosis.

Main Methods:

  • Neonatal rat cardiomyocytes were exposed to TNF-alpha, and apoptosis markers (caspase activity, Bax/Bcl-xl ratio) were assessed.
  • Adenovirus-mediated gene transfer was used to overexpress SOCS-1.
  • Specific MAPK inhibitors (PD98059 for ERK1/2, SB203580 for p38, SP600125 for JNK) were employed to investigate pathway involvement.
  • Western blotting was used to analyze ERK1/2 phosphorylation levels.

Main Results:

  • TNF-alpha significantly increased cardiomyocyte apoptosis, caspase activity, and the Bax/Bcl-xl ratio.
  • SOCS-1 overexpression reversed the pro-apoptotic effects of TNF-alpha.
  • Inhibition of ERK1/2 (but not p38 or JNK) attenuated SOCS-1's protective effect.
  • SOCS-1 overexpression prevented the TNF-alpha-induced decrease in ERK1/2 phosphorylation.

Conclusions:

  • SOCS-1 confers protection against TNF-alpha-induced apoptosis in cardiomyocytes.
  • The protective mechanism involves the activation of the extracellular signal-regulated kinase 1 and 2 (ERK1/2) pathway.
  • These findings highlight SOCS-1 as a potential therapeutic target for cardiovascular conditions involving TNF-alpha-mediated injury.

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