Abstract
Adiponectin, an adipokine with insulin-sensitizing effect, is secreted from adipocytes into circulation as high, medium, and low molecular weight forms (HMW, MMW, and LMW). The HMW adiponectin oligomers possess the most potent insulin-sensitizing activity. WSF-P-1(N-methyl-1,2,3,4,5,6-hexahydro-1,1,5,5-tetramethyl-7H-2,4α-methanonaphthalen-7-amine) is derived from natural sesquiterpene longifolene by chemical modifications. We found that WSF-P-1 activates AMPK in both 3T3-L1 adipocytes and 293T cells in this study. Activation of AMPK by WSF-P-1 promotes the assembly of HMW adiponectin and increases the HMW/total ratio of adiponectin in 3T3-L1 adipocytes. We demonstrated that the Ca2+-dependent CaMKK signaling pathway is involved in WSF-P-1-induced AMPK activation and adiponectin multimerization. WSF-P-1 also activates GLUT1-mediated glucose uptake in 3T3-L1 adipocytes, making it a potential drug candidate for the treatment of type 2 diabetes, obesity, and other obesity-related metabolic diseases.
Keywords:
AMPK; CaMKK; adiponectin; glucose uptake; insulin sensitivity.
MeSH terms
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3T3-L1 Cells
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AMP-Activated Protein Kinases / genetics*
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AMP-Activated Protein Kinases / metabolism
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Adipocytes / cytology
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Adipocytes / drug effects
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Adipocytes / metabolism
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Adiponectin / chemistry
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Adiponectin / genetics*
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Adiponectin / metabolism
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Animals
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Calcium / metabolism
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Calcium-Calmodulin-Dependent Protein Kinase Kinase / genetics
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Calcium-Calmodulin-Dependent Protein Kinase Kinase / metabolism
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Cell Differentiation
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Enzyme Activation / drug effects
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Enzyme Activators / chemical synthesis
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Enzyme Activators / pharmacology*
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Gene Expression Regulation / drug effects
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Glucose / metabolism
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Glucose Transporter Type 1 / genetics
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Glucose Transporter Type 1 / metabolism
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HEK293 Cells
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Humans
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Insulin Resistance
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Mice
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Protein Multimerization / drug effects*
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Sesquiterpenes / chemical synthesis
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Sesquiterpenes / chemistry
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Sesquiterpenes / pharmacology*
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Signal Transduction
Substances
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Adiponectin
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Enzyme Activators
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Glucose Transporter Type 1
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Sesquiterpenes
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Slc2a1 protein, mouse
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longifolene
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Calcium-Calmodulin-Dependent Protein Kinase Kinase
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AMP-Activated Protein Kinases
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Glucose
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Calcium