IMMUNE NETWORK

  • 제13권4호
  • /
  • Pages.123-132
  • /
  • 2013
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  • 1598-2629(pISSN)
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  • 2092-6685(eISSN)
대한면역학회 (The Korean Association of Immunobiologists)
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DOI QR코드

DOI QR Code

Metformin Down-regulates $TNF-{\alpha}$ Secretion via Suppression of Scavenger Receptors in Macrophages

  • 투고 : 2013.06.18
  • 심사 : 2013.07.02
  • 발행 : 2013.08.30
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⟨ 이전 논문 다음 논문 ⟩

초록

Obesity is consistently increasing in prevalence and can trigger insulin resistance and type 2 diabetes. Many lines of evidence have shown that macrophages play a major role in inflammation associated with obesity. This study was conducted to determine metformin, a widely prescribed drug for type 2 diabetes, would regulate inflammation through down-regulation of scavenger receptors in macrophages from obesity-induced type 2 diabetes. RAW 264.7 cells and peritoneal macrophages were stimulated with LPS to induce inflammation, and C57BL/6N mice were fed a high-fat diet to generate obesity-induced type 2 diabetes mice. Metformin reduced the production of NO, $PGE_2$ and pro-inflammatory cytokines ($IL-1{\beta}$, IL-6 and $TNF-{\alpha}$) through down-regulation of $NF-{\kappa}B$ translocation in macrophages in a dose-dependent manner. On the other hand, the protein expressions of anti-inflammatory cytokines, IL-4 and IL-10, were enhanced or maintained by metformin. Also, metformin suppressed secretion of $TNF-{\alpha}$ and reduced the protein and mRNA expression of $TNF-{\alpha}$ in obese mice as well as in macrophages. The expression of scavenger receptors, CD36 and SR-A, were attenuated by metformin in macrophages and obese mice. These results suggest that metformin may attenuate inflammatory responses by suppressing the production of $TNF-{\alpha}$ and the expressions of scavenger receptors.

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