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Related Experiment Videos

Interleukin-1beta and tumor necrosis factor-alpha decrease collagen synthesis and increase matrix metalloproteinase

D A Siwik1, D L Chang, W S Colucci

  • 1Myocardial Biology Unit, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA. USA.

Circulation Research
|June 24, 2000
PubMed
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This study investigated how inflammatory cytokines like IL-1beta and TNF-alpha affect collagen and matrix metalloproteinase (MMP) activity in heart fibroblasts. Researchers found that these cytokines reduce collagen production and increase MMP activity, which can break down collagen. The effects were measured using techniques like [(3)H]proline incorporation and in-gel zymography. The study suggests that these changes could contribute to heart disease by altering the structure of heart tissue. The findings may help explain how inflammation leads to structural changes in the heart.

Area of Science:

  • Cardiovascular physiology
  • Inflammation and immune response
  • Cellular signaling in fibroblasts

Background:

The role of inflammatory cytokines in regulating extracellular matrix (ECM) metabolism in cardiac fibroblasts remains poorly understood. Prior research has shown that cytokines influence ECM remodeling in various tissues. However, the specific effects of interleukin-1beta (IL-1beta) and tumor necrosis factor-alpha (TNF-alpha) on collagen synthesis and matrix metalloproteinase (MMP) activity in cardiac fibroblasts have not been fully resolved. This gap motivated a closer examination of how these cytokines might affect collagen production and degradation. It was already known that fibroblasts play a central role in maintaining ECM structure. Yet, the mechanisms by which inflammatory signals alter collagen synthesis remain unclear. This uncertainty drove the need to test the hypothesis that inflammatory cytokines regulate fibroblast ECM metabolism. No prior work had resolved whether IL-1beta and TNF-alpha specifically impact collagen and MMP expression in cardiac cells. This study aimed to address that knowledge gap.

Purpose Of The Study:

Keywords:
cardiac fibroblastsinflammatory cytokinescollagen synthesismatrix metalloproteinase activity

Frequently Asked Questions

IL-1beta and TNF-alpha decrease collagen synthesis and increase matrix metalloproteinase (MMP) activity in cardiac fibroblasts.

Collagen synthesis was measured using collagenase-sensitive [(3)H]proline incorporation into collagen.

In-gel zymography was used to detect specific increases in MMP-13, MMP-2, and MMP-9 activity.

The increase in proMMP-2 and proMMP-3 mRNA suggests that increased MMP activity may be partly due to transcriptional upregulation.

Related Experiment Videos

The study aimed to investigate whether inflammatory cytokines, specifically IL-1beta and TNF-alpha, regulate collagen synthesis and MMP activity in cultured cardiac fibroblasts. The specific problem addressed was the lack of clarity about how these cytokines influence ECM metabolism in the heart. The motivation stemmed from the potential role of ECM remodeling in cardiac pathologies such as ventricular dilation and myocardial failure. The researchers sought to determine whether IL-1beta and TNF-alpha could modulate collagen production and MMP activity. They also aimed to assess whether these effects were accompanied by changes in mRNA expression. The study focused on neonatal and adult rat cardiac fibroblasts in vitro. The goal was to measure collagen synthesis and MMP activity after cytokine exposure. This approach allowed for controlled observation of cytokine effects on ECM metabolism.

Main Methods:

The researchers exposed neonatal and adult rat cardiac fibroblasts in vitro to IL-1beta (4 ng/mL), TNF-alpha (100 ng/mL), IL-6 (10 ng/mL), or IFN-gamma (500 U/mL) for 24 hours. Collagen synthesis was measured using collagenase-sensitive [(3)H]proline incorporation. Total protein synthesis and cell number were also assessed. mRNA expression levels of procollagen and fibronectin were quantified using molecular techniques. MMP activity was analyzed via in-gel zymography to detect specific bands. The expression of proMMP-2 and proMMP-3 mRNA was evaluated to determine transcriptional changes. The study compared the effects of IL-1beta and TNF-alpha on collagen and MMP regulation. No other cytokines were found to significantly impact collagen synthesis. The experimental design allowed for a focused analysis of inflammatory cytokine effects on cardiac fibroblasts.

Main Results:

IL-1beta and TNF-alpha significantly decreased collagen synthesis in cardiac fibroblasts. This was measured as reduced [(3)H]proline incorporation into collagen. IL-1beta had a stronger effect than TNF-alpha. Neither cytokine affected cell number or total protein synthesis. IL-1beta decreased the expression of procollagen alpha(1)(I), alpha(2)(I), and alpha1(III) mRNA. It increased the expression of procollagen alpha(1)(IV), alpha(2)(IV), and fibronectin mRNA. This indicated a selective downregulation of fibrillar collagen synthesis. IL-1beta and TNF-alpha both increased total MMP activity, with specific increases in MMP-13, MMP-2, and MMP-9. IL-1beta increased proMMP-2 and proMMP-3 mRNA expression. This suggests that increased MMP activity may be partly due to transcriptional upregulation. The effects of IL-1beta were not dependent on nitric oxide (NO) production. These findings point to a direct role of IL-1beta in modulating ECM metabolism.

Conclusions:

The authors suggest that IL-1beta and TNF-alpha decrease collagen synthesis and increase MMP activity in cardiac fibroblasts. These findings indicate that these cytokines may contribute to ECM remodeling in the heart. The observed effects may promote ventricular dilation and myocardial failure. The study supports the hypothesis that inflammatory cytokines regulate fibroblast ECM metabolism. The results highlight a potential mechanism by which inflammation could lead to structural changes in cardiac tissue. The authors propose that the downregulation of fibrillar collagen and upregulation of MMPs could facilitate collagen degradation. They suggest that these effects may be relevant to the progression of heart disease. The study does not claim that these cytokines are essential for ECM remodeling, but they may play a significant role.

No, the effects of IL-1beta on collagen and MMP regulation were not dependent on NO production.

The authors suggest that IL-1beta and TNF-alpha may contribute to ventricular dilation and myocardial failure by promoting collagen remodeling.