Metformin decreases angiogenesis via NF-kappa B and Erk1/2/Erk5 pathways by increasing the antiangiogenic thrombospondin-1
Tan, Bee K., Adya, Raghu, Chen, Jing, Farhatullah, Syed, Heutling, Dennis, Mitchell, Daniel Anthony, Lehnert, Hendrik and Randeva, Harpal S.. (2009) Metformin decreases angiogenesis via NF-kappa B and Erk1/2/Erk5 pathways by increasing the antiangiogenic thrombospondin-1. Cardiovascular Research, Vol.83 (No.3). pp. 566-574. ISSN 0008-6363Full text not available from this repository.
Official URL: http://dx.doi.org/10.1093/cvr/cvp131
Polycystic ovary syndrome (PCOS) is associated with insulin resistance (IR), obesity, and cardiovascular complications. Thrombospondin-1 (TSP-1) is a novel antiangiogenic adipokine highly expressed in obese insulin-resistant subjects. We sought to assess TSP-1 levels in adipose tissue (AT) from PCOS women and matched controls. The effects of metformin treatment on circulating TSP-1 levels in PCOS subjects, the effects of serum from normal and PCOS women on in vitro migration and angiogenesis before and after metformin treatment, and ex vivo regulation of AT TSP-1 by D-glucose were also studied. Serum TSP-1 (ELISA), subcutaneous and omental AT TSP-1 mRNA (reverse transcriptase-polymerase chain reaction), and protein (western blotting) were significantly lower in PCOS women (P < 0.05). Corresponding plasminogen activator inhibitor-1 (PAI-1) and PAI-1 activity were significantly higher (P < 0.01). After 6 months of metformin treatment, there was a significant increase in serum TSP-1 (P < 0.05) and a corresponding decrease in PAI-1 and PAI-1 activity (P < 0.01). In vitro migration and angiogenesis were significantly increased in serum from PCOS women (P < 0.01); these effects were significantly attenuated by metformin treatment (P < 0.01) through the regulation of TSP-1 levels via nuclear factor-kappa B (NF-kappa B), extracellular regulated-signal kinase 1/2 (Erk1/2) and Erk5 pathways. Importantly, changes in the intima media thickness were predictive of changes in serum TSP-1 (P = 0.049). In AT explants, glucose significantly decreased TSP-1 protein production and secretion into conditioned media (ELISA) (P < 0.05, P < 0.001). TSP-1 levels are lower in PCOS women. Metformin treatment increases serum TSP-1 in these women. Our findings provide novel insights into the relationship between obesity, IR, and angiogenesis.
|Item Type:||Journal Article|
|Subjects:||Q Science > QM Human anatomy|
|Divisions:||Faculty of Medicine > Warwick Medical School > Metabolic and Vascular Health
Faculty of Medicine > Warwick Medical School
|Journal or Publication Title:||Cardiovascular Research|
|Publisher:||Oxford University Press|
|Date:||1 August 2009|
|Number of Pages:||9|
|Page Range:||pp. 566-574|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||The General Charities of the City of Coventry|
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