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Prolongation of responses in decentralization supersensitivity
Research Communications in Chemical Pathology and Pharmacology
|October 1, 1976
Summary
Responses to norepinephrine and acetylcholine in cat nictitating membranes were prolonged after decentralization. This suggests muscle changes, not just increased contraction strength, alter drug responses in this ocular muscle.
Area of Science:
- Pharmacology
- Neuroscience
- Ophthalmology
Background:
- The nictitating membrane is an accessory eyelid found in many vertebrates.
- Its muscle function can be altered by denervation or decentralization.
Purpose of the Study:
- To investigate the effects of chronic decentralization on the contractile responses of the cat nictitating membrane to neurotransmitters.
- To determine if prolonged responses are related to changes in muscle contractility or sensitivity.
Main Methods:
- Cats underwent chronic decentralization of the nictitating membrane.
- The membrane's responses to norepinephrine and acetylcholine were measured and analyzed.
Main Results:
- Pharmacological responses, specifically the duration of contractions induced by norepinephrine and acetylcholine, were significantly prolonged.
- The increased duration of contractions was independent of any increase in contraction amplitude.
- These findings suggest alterations within the muscle tissue itself.
Conclusions:
- Chronic decentralization of the nictitating membrane in cats leads to prolonged responses to norepinephrine and acetylcholine.
- The prolonged response is likely a result of intrinsic changes in the muscle tissue, rather than altered neurotransmitter sensitivity or signaling pathways.