Transient postnatal over nutrition induces long-term alterations in cardiac NLRP3-inflammasome pathway

Area of Science:

• Cardiovascular Science
• Metabolic Regulation
• Molecular Biology

Background:

• Rising global obesity rates pose significant health challenges.
• Postnatal overfeeding (PNOF) is a critical risk factor for impaired adult cardiac function.
• NLRP3 inflammasome and non-coding RNAs are implicated in heart disease development.

Purpose of the Study:

• To investigate the role of the NLRP3 inflammasome in PNOF-induced cardiac metabolic dysfunction.
• To explore the post-transcriptional regulation of the NLRP3 inflammasome by micro-RNAs in the context of PNOF.
• To elucidate the impact of PNOF on cardiac insulin signaling pathways.

Main Methods:

• Utilized a mouse model of PNOF induced by litter size reduction.
• Assessed cardiac protein expression of NLRP3 and ETS-1.
• Quantified microRNA-193b (miR-193b) levels in adult mouse hearts.
• Performed cardiomyocyte cell line experiments involving miR-193b transfection.

Main Results:

• PNOF exposure led to increased cardiac NLRP3 and ETS-1 protein levels and altered insulin signaling in mice.
• Adult hearts of overfed mice exhibited down-regulated miR-193b expression.
• In vitro, miR-193b transfection reduced ETS-1 and NLRP3 expression and improved insulin signaling in cardiomyocytes.

Conclusions:

• miR-193b may mediate cardiac phenotypic alterations in adulthood resulting from PNOF.
• Regulation of ETS-1 and NLRP3 expression by miR-193b appears to be a key mechanism.
• These molecular events likely influence cardiac insulin signaling pathways affected by early nutrition.