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Blood pressure early in diabetes depends on a balance between glomerular filtration rate and the renin-angiotensin system.

Abstract：

:Onset of diabetes increases plasma renin activity (PRA) and glomerular filtration rate (GFR), but blood pressure (BP) is normal. In this study, a 70% surgical reduction in kidney mass (RK) was used to decrease baseline GFR and to prevent hyperfiltration during diabetes, and angiotensin converting enzyme inhibitors (ACEI) were used to inhibit angiotensin II (AngII) production, to test the hypothesis that a balance between GFR and AngII is required for normal BP early in diabetes. Diabetes was induced with streptozotocin (STZ) (35 mg/kg intravenously); and after 7 days of hyperglycemia (range: 408 to 486 mg/dL), insulin was intravenously infused continuously for a 4-day normoglycemic recovery period. In normal kidney (NK) rats, diabetes increased PRA (2.4 +/- 0.6 to 4.6 +/- 0.5 ngAI/mL/h) and GFR (2.9 +/- 0.1 to 3.5 +/- 0.2 mL/min), and there was no change in mean arterial pressure (MAP) (89 +/- 1 v 91 +/- 1 mm Hg, measured 18 h/day). There was no change in either GFR or AngII during diabetes in RK+ACEI rats, and their MAP also did not change. Thus, the maintenance of normal MAP was accompanied by a balance between GFR and AngII in both of those groups. In NK+ACEI rats, however, GFR increased significantly with no change in AngII, and MAP decreased significantly during diabetes by approximately 8 mm Hg. In RK rats, PRA increased (0.5 +/- 0.1 to 2.6 +/- 0.5) but GFR did not increase, and MAP increased significantly by approximately 16 mm Hg. All rats were in sodium balance by day 4 of diabetes. These data support the hypothesis that normotension early in diabetes requires a balance between the increased AngII and GFR, and that BP will increase if AngII increases but GFR does not.

journal_name

Am J Hypertens

journal_title

American journal of hypertension

authors

Rojas M,Bell TD,Sturgis LC,Springfield V,Janardhanan R,Fleming C,Brands MW

doi

10.1016/j.amjhyper.2006.05.012

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

1249-55

issue

12

eissn

0895-7061

issn

1941-7225

pii

S0895-7061(06)00351-7

journal_volume

19

pub_type

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