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Contraction of cat nictitating membrane by tetramisole
Archives Internationales De Pharmacodynamie Et De Therapie
|March 1, 1979
Summary
Tetramisole causes a sustained contraction of the cat nictitating membrane. This effect is mediated by alpha-adrenergic receptors, as it is blocked by alpha blockade.
Area of Science:
- Pharmacology
- Neuroscience
- Physiology
Background:
- The nictitating membrane of cats is a useful model for studying autonomic neurotransmission.
- Understanding the mechanisms of smooth muscle contraction is crucial in pharmacology.
Purpose of the Study:
- To investigate the mechanism by which Tetramisole induces contraction of the cat nictitating membrane.
- To determine the role of adrenergic receptors in Tetramisole's action.
Main Methods:
- Administration of Tetramisole to cats.
- Surgical procedures including adrenalectomy.
- Pharmacological interventions such as reserpinisation, tyraminisation, and alpha blockade.
- Measurement of nictitating membrane contractions.
Main Results:
- Tetramisole induced a dose-dependent and persistent contraction of the cat nictitating membrane.
- Adrenalectomy, reserpinisation, and tyraminisation did not significantly alter the Tetramisole-induced contraction.
- Alpha blockade completely abolished the contractile response to Tetramisole.
Conclusions:
- The contraction of the cat nictitating membrane induced by Tetramisole is primarily mediated by alpha-adrenergic receptors.
- Tetramisole's action is independent of the sympathetic nervous system's endogenous stores or adrenal catecholamines.