Abstract
This study evaluated the possible impairments to endothelium-mediated vasodilation by structural and functional properties of the intestinal arterioles in adult (20-21-week-old) rats after 8-11 days or 7-8 weeks of streptozotocin-induced diabetes. Arteriolar intravascular pressures and luminal diameters were simultaneously measured during iontophoretic application of acetylcholine, bradykinin, and nitroprusside to the outer vessel wall, and passive diameter-pressure relations were obtained during maximal vasodilation. Microvascular pressures and circumference-passive wall tension relations were similar between all diabetic and normal rats and did not appear to significantly influence vasodilation. Both acute and chronic hyperglycemia were associated with near complete suppression of acetylcholine-induced vasodilation in large arterioles, and the threshold dose for vasodilation of intermediate arterioles was approximately 10-fold higher in diabetic rats. In both diabetic groups, dilatory responses to nitroprusside were normal, and in chronically diabetic rats, the relative vasodilation in response to various doses of bradykinin was equivalent to that found in normal rats. These observations indicate that a very specific deficit of acetylcholine-induced endothelium-derived relaxing factor action rapidly develops in intestinal arterioles of diabetic rats, but the arteriolar wall mechanical properties, cGMP-mediated muscle relaxation, and endothelial release of the bradykinin-stimulated relaxing factor are not compromised after 7-8 weeks of chronic hyperglycemia.
| Original language | English |
|---|---|
| Pages (from-to) | 1259-1268 |
| Number of pages | 10 |
| Journal | Circulation Research |
| Volume | 69 |
| Issue number | 5 |
| State | Published - 1991 |
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Keywords
- Arterioles
- Distensibility
- Endothelium-derived relaxing factor
- Streptozotocin
- Wall tension
ASJC Scopus subject areas
- Physiology
- Cardiology and Cardiovascular Medicine
Cite this
Structural and functional origins of suppressed acetylcholine vasodilation in diabetic rat intestinal arterioles. / Lash, J. M.; Bohlen, H.
In: Circulation Research, Vol. 69, No. 5, 1991, p. 1259-1268.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structural and functional origins of suppressed acetylcholine vasodilation in diabetic rat intestinal arterioles
AU - Lash, J. M.
AU - Bohlen, H.
PY - 1991
Y1 - 1991
N2 - This study evaluated the possible impairments to endothelium-mediated vasodilation by structural and functional properties of the intestinal arterioles in adult (20-21-week-old) rats after 8-11 days or 7-8 weeks of streptozotocin-induced diabetes. Arteriolar intravascular pressures and luminal diameters were simultaneously measured during iontophoretic application of acetylcholine, bradykinin, and nitroprusside to the outer vessel wall, and passive diameter-pressure relations were obtained during maximal vasodilation. Microvascular pressures and circumference-passive wall tension relations were similar between all diabetic and normal rats and did not appear to significantly influence vasodilation. Both acute and chronic hyperglycemia were associated with near complete suppression of acetylcholine-induced vasodilation in large arterioles, and the threshold dose for vasodilation of intermediate arterioles was approximately 10-fold higher in diabetic rats. In both diabetic groups, dilatory responses to nitroprusside were normal, and in chronically diabetic rats, the relative vasodilation in response to various doses of bradykinin was equivalent to that found in normal rats. These observations indicate that a very specific deficit of acetylcholine-induced endothelium-derived relaxing factor action rapidly develops in intestinal arterioles of diabetic rats, but the arteriolar wall mechanical properties, cGMP-mediated muscle relaxation, and endothelial release of the bradykinin-stimulated relaxing factor are not compromised after 7-8 weeks of chronic hyperglycemia.
AB - This study evaluated the possible impairments to endothelium-mediated vasodilation by structural and functional properties of the intestinal arterioles in adult (20-21-week-old) rats after 8-11 days or 7-8 weeks of streptozotocin-induced diabetes. Arteriolar intravascular pressures and luminal diameters were simultaneously measured during iontophoretic application of acetylcholine, bradykinin, and nitroprusside to the outer vessel wall, and passive diameter-pressure relations were obtained during maximal vasodilation. Microvascular pressures and circumference-passive wall tension relations were similar between all diabetic and normal rats and did not appear to significantly influence vasodilation. Both acute and chronic hyperglycemia were associated with near complete suppression of acetylcholine-induced vasodilation in large arterioles, and the threshold dose for vasodilation of intermediate arterioles was approximately 10-fold higher in diabetic rats. In both diabetic groups, dilatory responses to nitroprusside were normal, and in chronically diabetic rats, the relative vasodilation in response to various doses of bradykinin was equivalent to that found in normal rats. These observations indicate that a very specific deficit of acetylcholine-induced endothelium-derived relaxing factor action rapidly develops in intestinal arterioles of diabetic rats, but the arteriolar wall mechanical properties, cGMP-mediated muscle relaxation, and endothelial release of the bradykinin-stimulated relaxing factor are not compromised after 7-8 weeks of chronic hyperglycemia.
KW - Arterioles
KW - Distensibility
KW - Endothelium-derived relaxing factor
KW - Streptozotocin
KW - Wall tension
UR - http://www.scopus.com/inward/record.url?scp=0025941007&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0025941007&partnerID=8YFLogxK
M3 - Article
VL - 69
SP - 1259
EP - 1268
JO - Circulation Research
JF - Circulation Research
SN - 0009-7330
IS - 5
ER -