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Long-term smoking impairs platelet-derived nitric oxide release
K Ichiki1, H Ikeda, N Haramaki
1Third Department of Internal Medicine, Kurume University School of Medicine, Japan.
Circulation
|December 15, 1996
Summary
Long-term smoking impairs nitric oxide (NO) release from platelets, increasing platelet aggregation. This study shows reduced NO production and higher platelet activity in smokers compared to non-smokers.
Area of Science:
- Cardiovascular Physiology
- Platelet Biology
- Vascular Health
Background:
- Long-term smoking is known to impair endothelium-dependent vasodilation via nitric oxide (NO).
- The effect of smoking on platelet-derived NO release, a regulator of platelet aggregation, remains unclear.
Purpose of the Study:
- To investigate whether long-term smoking impairs nitric oxide (NO) release from platelets.
- To assess the impact of impaired NO release on platelet aggregation in smokers.
Main Methods:
- Measured collagen-induced platelet-derived electrical current using an NO-selective electrode in smokers and non-smokers.
- Assessed intraplatelet cyclic guanosine monophosphate (cGMP) and platelet aggregation in response to collagen.
- Utilized L-arginine and NG-monomethyl-L-arginine to probe the L-arginine-NO pathway in platelets.
Main Results:
- Platelet-derived electrical current and cGMP levels were significantly lower in smokers compared to non-smokers.
- L-arginine supplementation increased cGMP levels but remained lower in smokers.
- The inhibitory effect of L-arginine on collagen-induced platelet aggregation was reduced in smokers.
Conclusions:
- Platelet-derived nitric oxide (NO) release is significantly impaired in long-term smokers.
- This impairment contributes to augmented platelet aggregability in smokers.