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High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds

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Loss of Caveolin-1 Is Associated with a Decrease in Beta Cell Death in Mice on a High Fat Diet.

Paloma Lillo Urzúa¹, Olinda Núñez Murillo², Mauricio Castro-Sepúlveda³

¹Departamento de Ciencias Biológicas, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago 8370146, Chile.

International Journal of Molecular Sciences

|July 29, 2020

Summary

Caveolin-1 (CAV1) knockout mice showed reduced beta cell apoptosis on a high-fat diet, indicating better adaptation despite metabolic issues. This suggests CAV1 contributes to fatty acid-induced beta cell damage.

Keywords:

ERK activity caveolin-1 diabetes high fat diet insulin resistance

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Published on: June 16, 2011

Area of Science:

Metabolic disease research
Cell biology
Diabetes research

Background:

Elevated free fatty acids (FFAs) contribute to lipotoxicity in type 2 diabetes, impairing beta cell function and mass.
Caveolin-1 (CAV1) was previously shown to sensitize beta cells to palmitate-induced apoptosis.
CAV1 knockout (KO) mice were hypothesized to be protected from high-fat diet (HFD)-induced beta cell damage.

Purpose of the Study:

To investigate the in vivo effects of a HFD on beta cells in CAV1 KO mice.
To determine if CAV1 deficiency protects against HFD-induced beta cell apoptosis.
To explore the role of mitogen-activated protein kinase (MAPK) signaling in CAV1-mediated FFA sensitivity.

Main Methods:

C57Bl/6J CAV1 KO and wild-type (WT) mice were fed a control diet (CD) or HFD for 12 weeks.
Beta cell apoptosis was assessed in pancreatic islets.
MIN6 beta cells with or without CAV1 expression were treated with palmitate and MAPK inhibitors, followed by Western blot analysis.

Main Results:

CAV1 KO mice were resistant to HFD-induced weight gain but exhibited insulin resistance, impaired glucose tolerance, and elevated serum cholesterol and FFAs.
Despite metabolic dysfunction, CAV1 KO mice showed significantly reduced beta cell apoptosis on HFD compared to WT mice.
CAV1 enhanced palmitate-induced JNK, p38, and ERK phosphorylation in MIN6 cells; ERK inhibition most effectively restored cell viability.

Conclusions:

CAV1 KO mice demonstrate improved adaptation to HFD, characterized by reduced beta cell apoptosis, despite an unhealthy metabolic state.
CAV1 contributes to FFA-induced beta cell damage, potentially mediated by MAPK signaling pathways, particularly ERK.
Targeting CAV1 or its downstream signaling may offer therapeutic strategies for managing lipotoxicity in type 2 diabetes.