Emonnot L, Cohen R, Lo M. Neonatal streptozotocin-induced glucose intolerance: different consequences in Lyon normotensive and hypertensive rats.
J Hypertens 2007;
25:429-38. [PMID:
17211251 DOI:
10.1097/hjh.0b013e3280115bd2]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND
Lyon hypertensive (LH) rats exhibit a mild hypertension associated with excessive body weight, spontaneous hyperlipidemia, elevated insulin/glucose ratio and exaggerated urinary protein excretion.
AIMS
We aimed to develop, in LH rats and their normotensive control (LL) rats, a moderate non-insulin-dependent diabetic model to study the different consequences on metabolic and renal functions.
METHODS
Non-insulin-dependent diabetes was induced by intraperitoneal injection of streptozotocin (STZ) at 2 days of age (50, 75 or 100 mg/kg for LH and 75, 100 or 125 mg/kg for LL rats). The evolution, with age, of glycemia, glucose tolerance (glucose 2 g/kg by gavage), blood pressure, plasma lipids and urinary protein and albumin excretions were studied in control and STZ-treated LH and LL rats.
RESULTS
Although fasting glycemia was not significantly changed, the neonatal administration of STZ increased non-fasting glycemia and induced a marked glucose intolerance that were comparable between LH rats receiving 75 mg/kg and LL rats receiving 100 mg/kg of STZ. Interestingly, in treated LH rats only, the impaired glucose tolerance was accompanied by further metabolic and renal dysfunctions characterized by additional increases in plasma cholesterol (+28%) and triglycerides (+105%) and accelerated progression of proteinuria (+36%) and albuminuria (+48%).
CONCLUSIONS
These observations indicate that susceptibility to diabetic metabolic disorders and renal diseases may be linked to the genetic predisposition to hypertension. This new model offers a reasonable reflection of the human situation, where hypertension and non-insulin-dependent diabetes often coincide, suitable for molecular, biochemical and pharmacological investigations.
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