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Acute homocysteine administration does not elevate sympathetic nerve activity in rats
Martin S Muntzel1, Tawyanna Joseph, Onyekwere Onwumere
1Department of Biological Sciences, Lehman College, 250 Bedford Park Boulevard West, Bronx, NY 10468-1589, USA. martin.muntzel@lehman.cuny.edu
Atherosclerosis
|June 2, 2005
Summary
Acute homocysteine infusion did not affect sympathetic nerve activity in rats. This study found no evidence that homocysteine directly increases sympathetic nerve activity, impacting vascular and end-organ damage research.
Area of Science:
- Cardiovascular Physiology
- Neuroendocrinology
Background:
- Hyperhomocysteinemia and sympathetic overactivity share traits like increased platelet aggregation and atherosclerosis.
- This overlap suggests homocysteine might elevate sympathetic nerve activity (SNA), contributing to vascular damage.
Purpose of the Study:
- To investigate if acute homocysteine administration increases sympathetic nerve activity (SNA) in rats.
- To determine the direct effect of homocysteine on cardiovascular parameters and sympathetic outflow.
Main Methods:
- Rats were anesthetized and received continuous intravenous infusions of either vehicle (saline) or d,l-homocysteine.
- Mean arterial pressure, heart rate, and lumbar sympathetic nerve activity (SNA) were continuously monitored.
Main Results:
- Homocysteine infusion (105 min) did not significantly alter lumbar sympathetic outflow.
- No significant effects of acute homocysteine on heart rate or mean arterial pressure were observed.
Conclusions:
- Acute administration of homocysteine does not increase sympathetic nerve activity in anesthetized rats.
- These findings suggest that the link between hyperhomocysteinemia and sympathetic overactivity may not be a direct one.
- Further research is needed to explore alternative mechanisms linking homocysteine to cardiovascular and end-organ damage.