ArticleInternational journal of obesity (2005)2025
GRK5 is required for adipocyte differentiation through ERK activation.
Article in International journal of obesity (2005), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Integrated environmental and genomic analysis reveals the drivers and genetic mechanisms of agro-climatic adaptation in geese.BMC genomics · 2026Article
- Identification of novel candidate neural genes for diet-induced obesity in outbred heterogeneous stock rats.Research square · 2026Article
- Cell-based and isoform-selective G protein-coupled receptor kinase assays for comprehensive inhibitor evaluation.Communications biology · 2026Article
- Pharmacological inhibition of G protein-coupled receptor kinase 5 decreases high-fat diet-induced hepatic steatosis in mice.Biochemical and biophysical research communications · 2026Article
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Abstract
Previous studies have identified G protein-coupled receptor (GPCR) kinase 5 (GRK5) as a genetic factor contributing to obesity pathogenesis, but the underlying mechanism remains unclear. We demonstrate here that Grk5 mRNA is more abundant in stromal vascular fractions of mouse white adipose tissue, the fraction that contains adipose progenitor cells, or committed preadipocytes, than in adipocyte fractions. Thus, we generated a GRK5 knockout (KO) 3T3-L1 preadipocyte to further investigate the mechanistic role of GRK5 in regulating adipocyte differentiation. During adipogenic stimulation, GRK5 KO preadipocytes had decreased lipid accumulation and delayed mature adipocyte development compared to wildtype cells coupled with suppressed adipogenic and lipogenic gene expression. Beside GPCR signaling, RNA sequencing and pathway analysis identified insulin-like growth factor 1 (IGF-1) signaling to be one of the top 5 significantly dysregulated pathways in GRK5 KO cells. GRK5 KO cells also displayed decreased insulin-stimulated ERK phosphorylation, a downstream target of insulin-stimulated IGF-1 receptor activation, suggesting that GRK5 acts through this critical pathway to impact 3T3-L1 adipocyte differentiation. To find a more translational approach, we identified a new small molecule GRK5 inhibitor that was able to reduce 3T3-L1 adipogenesis. These data suggest that GRK5 is required for adipocyte differentiation through IGF-1 receptor/ERK activation and may be a promising translational target for obesity.
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