Cardiovascular and renal characteristics, and responses to acute volume expansion of a rat model of diabetic pregnancy

Daiyi Tang, Tianzheng Yu, Ali A. Khraibi

Research output: Contribution to journalArticle

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Abstract

The objective of this study was to characterize the cardiovascular and renal alterations that occur during diabetic pregnancy, and to evaluate the effect of insulin treatment in 12-14 days pregnant diabetic rats. Four groups of female Sprague Dawley rats were studied: virgin control group (NP), pregnant control group (CP), diabetic pregnant group (DP), and diabetic pregnant group with insulin treatment (DPI). Systolic arterial pressure (SAP) was increased on day 12, whereas heart rate (HR) decreased starting with day 3 in DP group of rats. DP rats exhibited marked renal hypertrophy with greater kidney weight (wt) and kidney wt/body wt ratio. Insulin treatment normalized blood glucose (BG) concentration, SAP and HR, and prevented the increase in kidney wt/body wt ratio in DPI rats. At the time of the terminal acute experiment, acute saline volume expansion (VE, 5% body wt/30 min) significantly increased renal interstitial hydrostatic pressure (RIHP), urinary sodium excretion (U NaV) and urine flow rate (V) in all groups, but the increases (Δ) were significantly attenuated in both CP (1.7 ± 0.2mmHg, 12.0 ± 1.5 μEq.min-1.g kidney wt-1 and 76.2 ± 10.9 μl.min-1.g kidney wt-1 for ΔRIHP, ΔUNaV and ΔV respectively) and DP (1.3 ± 0.1 mmHg, 6.8 ± 1.8 μEq.min-1.g kidney wt-1 and 32.3 ± 9.3 μl.min-1.g kidney wt-1 for ΔRIHP, ΔUNaV and ΔV respectively) group of rats as compared to NP (4.0 ± 0.6 mmHg, 21.6 ± 1.4 μEq.min-1.g kidney wt-1and 136.8 ± 10.5 μl.min-1.g kidney wt -1 for ΔRIHP, ΔUNaV and ΔV respectively) group of rats. Although RIHP response to VE was similar in DP and CP group of rats, the natriuretic and diuretic responses to VE were significantly lower in DP as compared to CP group of rats. Insulin treatment had no effect on RIHP response (ΔRIHP = 1.5 ± 0.3 mmHg), but restored most of the natriuretic (ΔUNaV = 15.7 ± 2.9 μEq.min -1.g kidney wt-1) and diuretic (ΔV = 100.2 ± 19.3 μl.min-1.g kidney wt-1) responses to VE in DPI as compared with CP group of rats. These data suggest that with VE, the restoration of the increase in UNaV and V with insulin treatment in diabetic pregnant rats is not mediated by changes in RIHP.

Original languageEnglish (US)
Pages (from-to)2909-2918
Number of pages10
JournalLife sciences
Volume74
Issue number23
DOIs
StatePublished - Apr 23 2004

Fingerprint

Rats
Hydrostatic pressure
Kidney
Pregnancy
Hydrostatic Pressure
Weights and Measures
Insulin
Diuretics
Body Weight
Restoration
Blood Glucose
Arterial Pressure
Heart Rate
Sodium
Flow rate
Blood Pressure
Control Groups
Hypertrophy

Keywords

  • Diabetes mellitus
  • Natriureisis and diuresis
  • Pregnancy
  • Renal interstitial hydrostatic pressure
  • Volume expansion

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

Cite this

Cardiovascular and renal characteristics, and responses to acute volume expansion of a rat model of diabetic pregnancy. / Tang, Daiyi; Yu, Tianzheng; Khraibi, Ali A.

In: Life sciences, Vol. 74, No. 23, 23.04.2004, p. 2909-2918.

Research output: Contribution to journalArticle

Tang, Daiyi ; Yu, Tianzheng ; Khraibi, Ali A. / Cardiovascular and renal characteristics, and responses to acute volume expansion of a rat model of diabetic pregnancy. In: Life sciences. 2004 ; Vol. 74, No. 23. pp. 2909-2918.
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N2 - The objective of this study was to characterize the cardiovascular and renal alterations that occur during diabetic pregnancy, and to evaluate the effect of insulin treatment in 12-14 days pregnant diabetic rats. Four groups of female Sprague Dawley rats were studied: virgin control group (NP), pregnant control group (CP), diabetic pregnant group (DP), and diabetic pregnant group with insulin treatment (DPI). Systolic arterial pressure (SAP) was increased on day 12, whereas heart rate (HR) decreased starting with day 3 in DP group of rats. DP rats exhibited marked renal hypertrophy with greater kidney weight (wt) and kidney wt/body wt ratio. Insulin treatment normalized blood glucose (BG) concentration, SAP and HR, and prevented the increase in kidney wt/body wt ratio in DPI rats. At the time of the terminal acute experiment, acute saline volume expansion (VE, 5% body wt/30 min) significantly increased renal interstitial hydrostatic pressure (RIHP), urinary sodium excretion (U NaV) and urine flow rate (V) in all groups, but the increases (Δ) were significantly attenuated in both CP (1.7 ± 0.2mmHg, 12.0 ± 1.5 μEq.min-1.g kidney wt-1 and 76.2 ± 10.9 μl.min-1.g kidney wt-1 for ΔRIHP, ΔUNaV and ΔV respectively) and DP (1.3 ± 0.1 mmHg, 6.8 ± 1.8 μEq.min-1.g kidney wt-1 and 32.3 ± 9.3 μl.min-1.g kidney wt-1 for ΔRIHP, ΔUNaV and ΔV respectively) group of rats as compared to NP (4.0 ± 0.6 mmHg, 21.6 ± 1.4 μEq.min-1.g kidney wt-1and 136.8 ± 10.5 μl.min-1.g kidney wt -1 for ΔRIHP, ΔUNaV and ΔV respectively) group of rats. Although RIHP response to VE was similar in DP and CP group of rats, the natriuretic and diuretic responses to VE were significantly lower in DP as compared to CP group of rats. Insulin treatment had no effect on RIHP response (ΔRIHP = 1.5 ± 0.3 mmHg), but restored most of the natriuretic (ΔUNaV = 15.7 ± 2.9 μEq.min -1.g kidney wt-1) and diuretic (ΔV = 100.2 ± 19.3 μl.min-1.g kidney wt-1) responses to VE in DPI as compared with CP group of rats. These data suggest that with VE, the restoration of the increase in UNaV and V with insulin treatment in diabetic pregnant rats is not mediated by changes in RIHP.

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