miR-130b-3p alleviates palmitate-induced lipotoxicity via the PPARυ signaling pathway in cardiomyocytes

  1. Villa, E. Alonso 23
  2. Bonet, F. 23
  3. Quezada-Feijoo, M. 1
  4. Ramos, M. 1
  5. Fernandez De Córdoba, M.D. 3
  6. Perez-Perez, C. 2
  7. Campanario, I. 2
  8. Mangas, A. 2
  9. Toro, R. 2
  1. 1 Cardiologia, Cruz Roja Hospital, Madrid, Spain
  2. 2 Medicine Department, Universidad de Cádiz, Cádiz, Spain
  3. 3 Research Unit, Biomedical Research and Innovation Institute of Cadiz (INiBICA), Cádiz, Spain

ISSN: 0021-9150

Year of publication: 2023

Volume: 379

Pages: S177

Type: Article

DOI: 10.1016/J.ATHEROSCLEROSIS.2023.06.596 GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Atherosclerosis


Background and Aims: The heart is the most energy-demanding tissue of the body and utilizes fatty acids (FAs) for ATP generation. However, excess lipid accumulation in adult cardiomyocytes conduces to lipotoxicity, accompanied by overproduction of reactive oxygen species (ROS), and to cardiac dysfunction. It is well documented that peroxisome proliferator-activated receptor gamma (PPARϒ) modulates genes expression involved in uptake, storage, oxidation and synthesis of FA. Cardiomyocyte-specific overexpression of PPARϒ causes dilated cardiomyopathy associated to lipotoxicity in mice. In this context, we have previously demonstrated that miR-130b-30 is downregulated in plasma of idiopathic DCM patients. Analysis in silico show PPARϒ as potential target of miR-130b-3p, however whether miR-130b-3p may modulate lipotoxicity via PPARϒ is still unknown.Methods: AC16 cells were transfected with miR-130b-3p mimic and supplemented with Palmitate (PA), as in vitro lipotoxicity model. PPARϒ and downstream PPARϒ expression levels were estimated by qRT-PCR. Mitochondrial oxidated stress status was assessed by MitoTracker Green together with Redox-Sensor.Results: Our results showed that overexpression of miR-130b-3p rescued PA-induced PPARϒ expression. CD36, PLIN2, FASN and CPT1B expression were upregulated in PA condition but miR-130b-3p mimic presence significantly reverted the increased levels of CD36, PLIN2 and CPT1B. In agreement, the oxidative stress intensity was higher upon PA treatment and alleviated with miR-130b-3p overexpression.Conclusions: These findings suggest that miR-130b-3p may exert a protector role against PA-induced lipotoxicity and associated damage in human cardiomyocytes through modulation of PPARϒ signaling pathway.