Effect of histamine on intracortical blood vessels of rats / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1284-1287, 2006.
Article
in Chinese
| WPRIM
| ID: wpr-334942
ABSTRACT
<p><b>OBJECTIVE</b>To investigate histamine-induced changes of the intracortical vessels in the cortical slice of rat brain.</p><p><b>METHODS</b>Immunohistochemistry was employed to detect the expression of H1 and H2 receptors in the intracortical blood vessels of rats. Histamine-induced constriction of the intracortical blood vessels of the brain slices was observed with differential interference contrast microscope. Measurements of the luminal diameter were made on-line during the course of the experiment and confirmed off-line from the stored images. In order to observe whether histamine H1 and H2 receptors affected histamine-induced constriction, the intracortical blood vessels in the brain slices were pre-treated with H1 receptor antagonist diphenhydramine and H2 receptor antagonist cimetidine.</p><p><b>RESULTS</b>Expression of H1 and H2 receptors was detected in the intracortical blood vessels of the rat brain. Histamine (1-100 micromol/L) induced a concentration-dependent constriction from (1.48-/+0.67)% to (32.91-/+7.91)%. The reactions to each histamine concentration were significantly (P<0.01) different from each other, with the exception of the highest histamine concentrations (30 and 100 micromol/L) when maximal constriction due to histamine were observed (P>0.05). With pre-treatment of the slice with 10 micromol/L diphenhydramine, application of histamine did not elicit constriction. Pre-treatment of the slice with 10 micromol/L cimetidine did not completely inhibit but somehow significantly weakened vascular constriction in response to histamine treatment at 10 and 30 micromol/L (P<0.05).</p><p><b>CONCLUSION</b>Histamine can induce constriction of the intracortical blood vessels, which is mediated by H1 receptor.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pharmacology
/
Physiology
/
Vasoconstriction
/
Blood Vessels
/
In Vitro Techniques
/
Receptors, Histamine H1
/
Receptors, Histamine H2
/
Histamine
/
Cerebral Cortex
/
Cimetidine
Limits:
Animals
Language:
Chinese
Journal:
Journal of Southern Medical University
Year:
2006
Type:
Article
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