Clinically confirmed DEL-1 as a myokine attenuates lipid-induced inflammation and insulin resistance in 3T3-L1 adipocytes via AMPK/HO-1- pathway.

Abstract

Regular exercise is the first line of therapy for treating obesity-mediated metabolic disorders, including insulin resistance. It has been reported that developmental endothelial locus-1 (DEL-1) enhances macrophage efferocytosis, resulting in inflammation clearance as well as improves insulin resistance in skeletal muscle. However, the relationship between exercise and DEL-1, and the effects of DEL-1 on insulin signalling in adipocytes have not been fully elucidated to date. Protein expression levels were determined by Western blot analysis. Cells were transfected with small interfering (si) RNA to suppress gene expression. Lipid accumulation levels were detected using Oil red-O staining. Proinflammatory cytokine secretion levels were measured using ELISA. DEL-1 expression levels were induced in the skeletal muscle of people who exercised using microarray analysis. Recombinant DEL-1 augmented AMP-activated protein kinase (AMPK) phosphorylation and haem oxygenase (HO)-1 expression to alleviating inflammation and impairment of insulin signalling in 3T3-L1 adipocytes treated with palmitate. siRNA of AMPK or HO-1 also mitigated the effects of DEL-1 on inflammation and insulin resistance. DEL-1 ameliorates inflammation and insulin resistance in differentiated 3T3-L1 cells via AMPK/HO-1 signalling, suggesting that DEL-1 may be the exercise-mediated therapeutic target for treating insulin resistance and type 2 diabetes.

• Authors: Chang Hyuk Kwon, Jaw Long Sun, Myeong Jun Kim, A M Abd El-Aty, Ji Hoon Jeong, Tae Woo Jung
• Journal: Adipocyte (Adipocyte) Vol. 9 Issue 1 Pg. 576-586 (12 2020) ISSN: 2162-397X [Electronic] United States
• PMID: 32954935 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Calcium-Binding Proteins
• Cell Adhesion Molecules
• EDIL3 protein, human
• Insulin
• Heme Oxygenase-1
• AMP-Activated Protein Kinases

Topics

• 3T3-L1 Cells
• AMP-Activated Protein Kinases (metabolism)
• Adipocytes (metabolism)
• Animals
• Calcium-Binding Proteins (genetics, metabolism)
• Cell Adhesion Molecules (genetics, metabolism)
• Exercise
• Gene Silencing
• Heme Oxygenase-1 (metabolism)
• Humans
• Inflammation (etiology, metabolism, pathology)
• Insulin (metabolism)
• Insulin Resistance (genetics)
• Lipid Metabolism
• Mice
• Muscle, Skeletal (metabolism)
• Signal Transduction