Related Experiment Videos
Adaptive vasodilatory response after octreotide treatment
1Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital and National Yang-Ming University School of Medicine, Taiwan.
Summary
Octreotide treatment in cirrhotic rats enhanced endothelium-dependent vasodilation, potentially counteracting its effects in portal hypertension. This study explored the interaction of vasodilators after octreotide administration.
Area of Science:
- Cardiovascular Physiology
- Hepatology
- Pharmacology
Background:
- Portal hypertension is characterized by hemodynamic derangements and altered vasodilation.
- Octreotide, a somatostatin analog, suppresses glucagon but its effects on vasodilation in portal hypertension are not fully understood.
Purpose of the Study:
- To investigate the interaction between endothelium-dependent and independent vasodilators after octreotide administration in cirrhotic rats.
- To evaluate the impact of octreotide on vasodilatory responses and endothelial nitric oxide synthase (eNOS) expression.
Main Methods:
- Cirrhotic rats received vehicle or octreotide (30 or 100 microg/kg) subcutaneously for one week.
- Hemodynamic parameters, plasma glucagon, serum 6-keto-PGF(1 alpha), NOx levels, and aortic eNOS expression were measured.
- Vasodilatory responses were assessed using L-NAME and indomethacin, alone and in combination.
Main Results:
- Octreotide decreased plasma glucagon and increased serum 6-keto-PGF(1 alpha) and NOx levels without altering hemodynamics.
- In octreotide-treated cirrhotic rats, responses to L-NAME or indomethacin alone were blunted but normalized with combined administration.
- Aortic eNOS expression was increased in rats receiving octreotide.
Conclusions:
- One-week octreotide treatment did not resolve hemodynamic issues in cirrhotic rats.
- Octreotide enhanced endothelium-related vasodilatory activity, potentially mitigating its own hemodynamic effects in portal hypertension.