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ORIGINAL RESEARCH

Insulin Stimulates IL-23 Expression in Human Adipocytes: A Possible Explanation for the Higher Prevalence of Psoriasis in Obesity

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Pages 1885-1893 | Received 19 Jan 2023, Accepted 19 May 2023, Published online: 23 Jun 2023

Figures & data

Figure 1 Dose-dependent effects of insulin on IL-23 expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control), low-dose (0.1 µM) and high-dose (5 µM) insulin and then PCR analysis of IL-23 mRNA expression was performed. Data are expressed as means ± SD of five independent experiments. *P<0.05; **P< 0.01.

Figure 1 Dose-dependent effects of insulin on IL-23 expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control), low-dose (0.1 µM) and high-dose (5 µM) insulin and then PCR analysis of IL-23 mRNA expression was performed. Data are expressed as means ± SD of five independent experiments. *P<0.05; **P< 0.01.

Figure 2 Insulin upregulates the IL-23 protein expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control) and insulin (5 µM). (A) Representative western blot analysis showing IL-23 protein expression. (B) Western blot densitometric quantification of IL-23 protein expression as normalized to β-actin. Control = saline. Values are expressed as mean ±SD from five independent experiments. *P<0.01.

Figure 2 Insulin upregulates the IL-23 protein expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control) and insulin (5 µM). (A) Representative western blot analysis showing IL-23 protein expression. (B) Western blot densitometric quantification of IL-23 protein expression as normalized to β-actin. Control = saline. Values are expressed as mean ±SD from five independent experiments. *P<0.01.

Figure 3 Insulin does not stimulate LL-37 mRNA expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control) and insulin (5 µM) and then PCR analysis of LL-37 mRNA expression was performed. Data are mean ± SD of five independent experiments.

Figure 3 Insulin does not stimulate LL-37 mRNA expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control) and insulin (5 µM) and then PCR analysis of LL-37 mRNA expression was performed. Data are mean ± SD of five independent experiments.

Figure 4 LPS does not stimulate IL-23 mRNA expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control) and LPS (1 ng/mL) and then PCR analysis of IL-23 mRNA expression was performed. Data are expressed as mean ± SD of five independent experiments.

Figure 4 LPS does not stimulate IL-23 mRNA expression in human adipocytes. In vitro differentiated human adipocytes were incubated for 24 hours with saline (control) and LPS (1 ng/mL) and then PCR analysis of IL-23 mRNA expression was performed. Data are expressed as mean ± SD of five independent experiments.