Journal
JOURNAL OF PHARMACY AND PHARMACOLOGY
Volume 57, Issue 6, Pages 773-780Publisher
ROYAL PHARMACEUTICAL SOC GREAT BRITAIN
DOI: 10.1211/0022357056154
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In this study we examined the effect of green tea polyphenols (GTP) and partially hydrolysed guar gum (PHGG) as dietary fibre on diabetic nephropathy, using rats that had been subjected to subtotal nephrectomy and injection of streptozotocin. The subtotally nephrectomized rats were subjected to resection of three-quarters of the kidney. Rats with diabetic nephropathy were divided into four groups: untreated controls, and animals that received GTP (100 mg kg(-1) body weight day(-1)), PHGG (100 mg kg(-1) body weight day(-1)) and GTP plus PHGG (50 mg kg(-1) body weight day(-1) plus 50 mg kg(-1) body weight day(-1)). After 50 days of administration, attenuation of urinary protein excretion and the morphological changes peculiar to diabetic nephropathy were observed in all three treated groups. Furthermore, the group treated with GTP plus PHGG showed an improvement of kidney weight and serum levels of urea nitrogen, creatinine and creatinine clearance. Hyperglycaemia, as assessed in terms of blood glucose and glycosylated protein levels, was also improved by administration of GTP plus PHGG. On the other hand, GTP administration increased the activity of superoxide dismutase in the kidney to a significant extent. A significant reduction in the total cholesterol concentration was also observed in the PHGG-treated group. These results suggest that GTP and PHGG could be beneficial as additional therapy in the management of diabetic nephropathy.
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