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[Acyclovir and guinea-pig airway smooth muscle]
Y Nasuhara1, M Munakata, Y Homma
1First Department of Medicine, School of Medicine, Hokkaido University, Sapporo, Japan.
Nihon Kyobu Shikkan Gakkai Zasshi
|July 1, 1995
Summary
Acyclovir, an anti-herpes drug, does not directly impact airway smooth muscle function. This study found no evidence that acyclovir affects muscle contraction or relaxation, ruling out a direct mechanism in aspirin-induced asthma.
Area of Science:
- Pharmacology
- Respiratory Medicine
- Smooth Muscle Physiology
Context:
- Aspirin-induced asthma (AIA) is a clinical condition where aspirin triggers asthma symptoms.
- Acyclovir, an antiviral medication, has been anecdotally linked to reduced aspirin sensitivity in some AIA patients.
- The underlying mechanism for acyclovir's effect on AIA remains unclear, with viral infection and direct smooth muscle effects being considered.
Purpose:
- To investigate the direct effects of acyclovir on airway smooth muscle.
- To determine if acyclovir can induce contraction or relaxation in isolated guinea pig airway smooth muscle.
- To assess if acyclovir modulates airway smooth muscle responses to common contractile and relaxant agents.
Summary:
- Acyclovir was tested in vitro on guinea pig airway smooth muscle strips.
- No direct contractile or relaxant effects of acyclovir on basal smooth muscle tone were observed.
- Acyclovir did not alter smooth muscle responses to leukotriene D4, prostaglandin E2, carbachol, or KCl.
Impact:
- This study provides evidence against a direct pharmacodynamic effect of acyclovir on airway smooth muscle.
- The findings suggest that any observed influence of acyclovir on aspirin-induced asthma is unlikely to be mediated by direct actions on airway smooth muscle.
- Further research is needed to elucidate the precise mechanisms, if any, by which acyclovir might influence aspirin-induced asthma.