Reduced IL-1β production in diet-induced obese mice impairs host defense against skin <i>Staphylococcus aureus</i> infection

  • Sakamoto Yuichi
    Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine
  • Narita Kouji
    Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine
  • Nakane Akio
    Department of Microbiology and Immunology, Hirosaki University Graduate School of Medicine

Bibliographic Information

Other Title
  • 食餌性肥満マウスにおけるIL-1β産生減少にともなう皮膚黄色ブドウ球菌感染防御機能の低下
  • Reduced IL-1β Production in Diet-Induced Obese Mice Impairs Host Defense against Skin Staphylococcus Aureus Infection

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Abstract

    Obesity leads to a state of chronic inflammation associated with increased levels of proinflammatory cytokines including interleukin-1β (IL-1β) that plays a critical role in host defense against Staphylococcus aureus infection. In this study, we investigated host defense against skin S. aureus infection in high-fat diet (HFD)-induced non-diabetic obesity by focusing on IL-1β production from subcutaneous adipose tissue derived-macrophages (SATDMs). Bacterial numbers in skin lesions of HFD-fed mice were higher than those of normal-fat diet (ND)-fed control mice on day 3 after subcutaneous S. aureus infection. IL-1β production from SATDMs of HFD-fed mice was less than that of ND-fed mice after stimulation with formalin-killed S. aureus and ATP. In addition, NLRP3 mRNA expression and protein level of activated caspase-1 in SATDMs of HFD-fed mice were lower than those of ND-fed mice after stimulation. Conversely, IL-1β production, NLRP3 mRNA expression and protein level of activated caspase-1 from visceral adipose tissue-derived macrophages of HFD-fed mice were higher than those of ND-fed mice. These results suggest that reduced IL-1β production in SATDMs of HFD-fed obese mice might be involved in impairment of host defense against skin S. aureus infection.

Journal

  • Hirosaki Medical Journal

    Hirosaki Medical Journal 64 (1), 29-40, 2013

    Hirosaki University Graduate School of Medicine,Hirosaki Medical Society

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