title: Insulin-Like Growth Factor-1 Increases the Expression of Inflammatory Biomarkers and Sebum Production in Cultured Sebocytes.
abstract: BACKGROUND
  Acne vulgaris has been linked to the Western diet. Hyperglycemic diet increases insulin and insulin-like growth factor (IGF)-1. Deeper insights into IGF-1-mediated signal pathway are critical importance to understand the impact of Western diet.
  
  
  OBJECTIVE
  We investigated the effect of IGF-1 on the expression of inflammatory biomarkers and sebum production in cultured sebocytes.
  
  
  METHODS
  Polymerase chain reaction and enzyme-linked immunosorbent assay were performed to measure changes in the expression of inflammatory biomarkers including interleukin (IL)-1β, IL-6, IL-8, tumor necrosis factor (TNF)-α, nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB), IGF1R, IGFBP2, sterol response element-binding protein (SREBP), and phosphatidylinositol-4,5-bisphosphate 3-kinase, catalytic subunit alpha (PI3KCA) after the treatment of cultured sebocytes with 10-7M or 10-5M IGF-1. Sebum production was evaluated after the treatment of cultured sebocytes with 10-7M or 10-5M IGF-1 using lipid analysis.
  
  
  RESULTS
  The expression levels of IL-1β, IL-6, IL-8, and TNF-α in cultured sebocytes after treatment with 10-7M or 10-5M IGF-1 were increased. Increased gene expression levels of NF-κB in cultured sebocytes were also shown after 10-7M or 10-5M IGF-1 treatments. Gene expression of these inflammatory biomarkers was decreased after 10-7M or 10-5M IGF-1 treatment in the presence of 100 nM NF-κB inhibitor. Treatment with 10-7M or 10-5M IGF-1 increased the gene expression levels of IGF1R, IGFBP2, SREBP and PI3KCA in cultured sebocytes. Sebum production from cultured sebocytes treated with 10-7M or 10-5M IGF-1 was also increased.
  
  
  CONCLUSIONS
  It is suggestive that IGF-1 might be involved in the pathogenesis of acne by increasing both expression of inflammatory biomarkers and also sebum production in sebocytes.
authors.affiliation: Department of Dermatology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
authors.forename: Hyojin
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Dermatology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Moon
authors.affiliation: Department of Dermatology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Mi Yeung
authors.initials: MY
authors.lastname: Sohn
authors.affiliation: Department of Dermatology, Kyungpook National University School of Medicine, Daegu, Korea.
authors.forename: Weon Ju
authors.initials: WJ
authors.lastname: Lee
keywords: Biomarkers; Insulin-like growth factor-1; Sebum