Thiazolidinedione derivatives ameliorate albuminuria in streptozotocin-induced diabetic spontaneous hypertensive rat

Metabolism: Clinical and Experimental
Haruhisa YamashitaKen-ichi Kobayashi

Abstract

Recent reports have shown that thiazolidinediones have preventive effects on urinary albumin excretion in diabetes. However, the mechanism leading to these effects has not yet been elucidated. We studied here the effects of thiazolidinediones on albuminuria and hemodynamic and morphological changes in the kidneys of streptozotocin (STZ)-induced diabetic spontaneous hypertensive rats (SHRs). Diabetes was induced in SHRs by intravenous injection of STZ (50 mg/kg). The diabetic SHRs were divided into the following 3 groups: (1) STZ-SHRs given normal chow (STZ), (2) STZ-SHRs given chow mixed with 0.1% troglitazone (STZ + tro), and (3) STZ-SHRs given chow mixed with 0.001% pioglitazone (STZ + pio). Three groups of nondiabetic SHRs were also investigated: (4) SHR, (5) tro, and (6) pio. We evaluated the urinary albumin excretion rate (AER) every 4 weeks. After 12 weeks of treatment, the animals were killed and renal morphological examinations were performed. Thiazolidinediones did not affect blood pressure or blood glucose levels. Urinary AER were markedly increased in STZ-SHRs. After 12 weeks of treatment with thiazolidinediones, the urinary AER was significantly decreased while creatinine (Cr) clearance was left unchanged. Histologi...Continue Reading

Citations

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