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. 1994 Jan;111(1):205–212. doi: 10.1111/j.1476-5381.1994.tb14045.x

L-NAME, nitric oxide and jejunal motility, blood flow and oxygen uptake in dogs.

A Alemayehu 1, K R Lock 1, R W Coatney 1, C C Chou 1
PMCID: PMC1910045  PMID: 8012697

Abstract

1. The effects of the inhibitor of nitric oxide (NO) synthesis, NG-nitro-L-arginine methyl ester (L-NAME), on systemic arterial blood pressure and jejunal motility, blood flow, and oxygen uptake have been investigated in anaesthetized dogs. 2. L-NAME (cumulative doses of 0.1-20 mg kg-1, i.v.) dose-dependently increased blood pressure and jejunal motility and decreased heart rate. The maximal response of these three variables occurred at doses, 3, 10 and 10 mg kg-1, respectively. L-NAME (cumulative doses of 0.5-5 mg kg-1) also dose-dependently induced jejunal vasoconstriction. The jejunal vascular resistance returned to control values as the cumulative doses reached 10 and 20 mg kg-1, which corresponded to the maximal increase in jejunal motility. 3. A single intravenous injection of L-NAME (10 mg kg-1) produced a prompt increase in blood pressure, which lasted for at least 50 min. 4. L-NAME (10 mg kg-1) produced a progressive rise in jejunal motility reaching its maximum (47 +/- 6 mmHg) 15 min after the administration, and lasting for 40-50 min. Both the basal lumen pressure and the amplitude of rhythmic contractions increased during this period. 5. L-NAME (10 mg kg-1) produced a triphasic change in jejunal vascular resistance and blood flow measured by timed collection of venous outflow. The blood flow decreased initially (-43% at 5 min), increased (+35%) and returned to control value between 15 and 35 min, then decreased (-35%) 40-50 min post-infusion. Jejunal vascular resistance reflected the blood flow response (+88% at both 5 and 50 min).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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