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Modulatory effects of l-arginine and soy enriched diet on bone homeostasis abnormalities in streptozotocin-induced diabetic rats
Update time:2015-03-26 23:47:00   【 Font: Large  Medium Small


Diabetes mellitus is a complex syndrome which is responsible for numerous complications affecting the whole body. Osteoporosis is regarded as one of the chronic complications of diabetes mellitus that results from reduced bone formation and increased resorption. In this context, we searched for dietary supplements that preserve diabetic bone loss. Parathyroid hormone (PTH) has been suggested as a possible mechanism affecting bone homeostasis in streptozotocin (STZ)-induced diabetic rats. The osteoprotective effects of l-arginine and soy enriched diet were also investigated. Male Wistar rats were allocated into four groups; normal control, untreated STZ-diabetic rats and STZ-diabetic rats treated with either l-arginine (10 mg/kg/day) or fed soy enriched diet (200 g/kg diet) for 12 weeks. l-Arginine and soy enriched diet normalized serum PTH level and increased serum osteocalcin level; bone osteocalcin, osteoprotegerin and runt-related transcription factor2 mRNA levels compared to diabetic rats. A decrease in serum pyridinoline, C-terminal telopeptides of type I collagen, cathepsin k levels and bone cathepsin k mRNA level was observed in both treated groups. Both treatments increased serum insulin and insulin like growth factor-1 levels and decreased urinary calcium excretion. In conclusion, l-arginine and soy enriched diet are effective in prevention of osteoporosis associated with diabetes mellitus.

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Source:Chemico-Biological Interactions      by SA EL-Maraghy, NA Mehana
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