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Saturated lipids decrease mitofusin 2 leading to endoplasmic reticulum stress activation and insulin resistance in
Brenda Diaz1, Lizeth Fuentes-Mera2, Armando Tovar3
1Departamento de Bioquímica, Universidad Autónoma de Nuevo León, Monterrey, Mexico; Neuroscience Unit, Centro de Investigación y Desarrollo en Ciencias de la Salud, Universidad Autonoma de Nuevo Leon, Monterrey, Mexico.
Brain Research
|September 28, 2015
Summary
Saturated fats, like palmitic acid, reduce Mitofusin 2 (MTF2) in the hypothalamus, triggering endoplasmic reticulum (ER) stress and worsening insulin resistance. This highlights a key mechanism in metabolic disease development.
Area of Science:
- Metabolic signaling
- Cellular biology
- Neuroendocrinology
Background:
- Endoplasmic reticulum (ER) and mitochondria dysfunction are implicated in insulin resistance associated with obesity and diabetes.
- Mitofusin 2 (MTF2) bridges ER and mitochondria, regulating energy metabolism and preventing ER stress and insulin resistance.
Purpose of the Study:
- To investigate if saturated lipids decrease MTF2 expression in the hypothalamus, leading to ER stress and insulin resistance.
- To explore the effects of saturated versus monounsaturated fatty acids on hypothalamic MTF2 levels and insulin sensitivity.
Main Methods:
- In vitro studies using hypothalamic mHypoA-CLU192 cells treated with palmitic acid or palmitoleic acid.
- Assessment of MTF2 protein levels, ER stress markers (GRP78/BIP), and insulin resistance.
- In vivo studies involving high-fat diet-fed mice to examine hypothalamic MTF2 levels.
Main Results:
- Palmitic acid, but not palmitoleic acid, reduced MTF2 protein levels in hypothalamic cells.
- Palmitic acid induced ER stress, evidenced by increased GRP78/BIP, following MTF2 downregulation.
- MTF2 reduction by palmitic acid exacerbated hypothalamic insulin resistance, an effect mitigated by anti-inflammatory and ER stress-releasing agents.
- High-fat feeding in mice decreased MTF2 protein levels in the hypothalamic arcuate nucleus.
Conclusions:
- Saturated lipids, specifically palmitic acid, decrease hypothalamic MTF2 expression.
- This MTF2 modulation by saturated fats contributes to ER stress and insulin resistance.
- Targeting MTF2 or mitigating ER stress may offer therapeutic strategies for obesity- and diabetes-related insulin resistance.
