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The regulatory mechanism of insulin like growth factor secretion by high glucose in mesangial cell: involvement of cAMP  

Heo, Jung-sun (Bio-safety Research Institute, College of Veterinary Medicine, Chonbuk National University)
Kang, Chang-won (Bio-safety Research Institute, College of Veterinary Medicine, Chonbuk National University)
Han, Ho-jae (College of Veterinary Medicine, Hormone Research Center, Chonnam National University)
Park, Soo-hyun (Bio-safety Research Institute, College of Veterinary Medicine, Chonbuk National University)
Publication Information
Korean Journal of Veterinary Research / v.43, no.4, 2003 , pp. 563-571 More about this Journal
Abstract
Dysfunction of mesangial cells has been contributed to the onset of diabetic nephropathy. Insulin like growth factors (IGFs) are also implicated in the pathogenesis of diabetic nephropathy. However, it is not yet known about the effect of high glucose on IGF-I and IGF-II secretion in the mesangial cells. Furthermore, the relationship between cAMP and high glucose on the secretion of IGFs was not elucidated. Thus, we examined the mechanisms by which high glucose regulates secretion of IGFs in mesangial cells. Glucose increased IGF-I secretion in a time- (>8 hr) and dose- (>15 mM) dependent manner (p<0.05). Stimulatory effect of high glucose on IGF-I secretion is predominantly observed in 25 mM glucose (high glucose), while 25 mM glucose did not affect cell viability and lactate dehydrogenase release. High glucose also increased IGF-II secretion. The increase of IGF-I and IGF-II secretion is not mediated by osmotic effect, since mannitol and L-glucose did not affect IGF-I and IGF-II secretion. 8-Br-cAMP mimicked high glucose-induced secretion of IGF-I and IGF-II. High glucose-induced stimulation of IGF-I and IGF-II secretion was blocked not by pertussis toxin but by SQ 22536 (adenylate cyclase inhibitor). Rp-cAMP (cAMP antagonist), and myristoylated protein kinase A (PKA) inhibitor amide 14-22 (protein kinase A inhibitor). These results suggest that cAMP/PKA pathways independent of Gi protein may mediate high glucose-induced increase of IGF-I and IGF-II secretion in mesangial cells. Indeed, glucose (>15 mM glucose) increased cAMP formation. In conclusion, high glucose stimulates IGF-I and IGF-II secretion via cAMP/PKA pathway in mesangial cells.
Keywords
Diabetic nephropathy; Insulin-like growth factor; high glucose; cAMP; mesangial cell;
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