Ursolic acid and rosiglitazone combination prevent low-grade inflammation and hepatic insulin resistance by modulating cytokine expression in mice fed a high-fat diet

Abstract

<p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-theme-font: minor-bidi;">Background:</span></p> <p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-theme-font: minor-bidi;">The objective of this research endeavor was to assess the effects of rosiglitazone (RSG) and ursolic acid (UA) on hepatic insulin signaling indicators and inflammatory marker concentrations in C57/BL/6J mice that were provided with a high-fat diet (HFD). </span></p> <p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-font-family: PMingLiU;">Methods:</span></p> <p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-theme-font: minor-bidi;">C57BL/6J mice were fed a HFD for 16 weeks and orally administered UA (5 mg/kg BW), RSG (4 mg/kg BW), and UA (5 mg/kg BW) + RSG (4 mg/kg BW) for the last 6 weeks. </span></p> <p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-font-family: PMingLiU;">Results:</span></p> <p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-theme-font: minor-bidi;">The HFD groups showed a significant increase in leptin, TNF-&alpha;, and IL-6, whereas adiponection level significantly decreased. The expression of insulin signaling markers in the liver also significantly increased in HFD mice. </span></p> <p class="MsoNormal" style="text-align: justify;"><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-hansi-theme-font: minor-bidi; mso-bidi-font-family: PMingLiU;">Conclusions:</span></p> <p><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-fareast-font-family: PMingLiU; mso-hansi-theme-font: minor-bidi; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: EN-US;">Combination treatment </span><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-fareast-font-family: PMingLiU; mso-hansi-theme-font: minor-bidi; mso-bidi-font-family: PMingLiU; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: EN-US;">improves</span><span style="font-size: 10.0pt; font-family: 'Arial',sans-serif; mso-ascii-theme-font: minor-bidi; mso-fareast-font-family: PMingLiU; mso-hansi-theme-font: minor-bidi; mso-bidi-theme-font: minor-bidi; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: EN-US;"> above said parameters than individual parameters. These data suggest that combination treatment (UA with RSG) has potential benefits for the treatment of HFD-induced insulin resistance, and its effects may be associated with improvements in the inhibition of the expression of inflammatory markers in plasma and liver.</span></p>