TY - JOUR
T1 - Seasonal variations in the muscarinic regulation of acetylcholine release from torpedo electric organ nerve terminals
AU - Pinchasi, I.
AU - Burstein, M.
AU - Moldovan, M.
AU - Michaelson, D. M.
N1 - Funding Information:
Acknowledgements-This work was supportedi n part by grants from the Dysautonomia Foundation and the U.S.-Israel Binational Science Foundation (Grant No. 2410).
PY - 1985
Y1 - 1985
N2 - 1. 1. The cholinergic nerve endings of the electric organs of Torpedo ocellata contain presynaptic muscarinic acetylcholine receptors (mAChR) which regulate acetylcholine (ACh) release by negative feedback. 2. 2. The efficiency of this muscarinic regulation varies circannually: maximal inhibition is observed in the winter, much smaller effects in the fall and spring, and no effect is observed during the summer. 3. 3. These variations are accompanied by seasonal changes in the ability of the mAChR to trigger the synthesis of its second messenger (a prostaglandin E-like substance) and in the ability of exogenous prostaglandin E2 to inhibit ACh release. No seasonal changes were found in the number of presynaptic mAChRs. 4. 4. These findings suggest that the observed seasonal variations are due to changes in both the metabolism of prostaglandins in the electric organ and the sensitivity of the ACh-releasing apparatus to the muscarinic second messenger.
AB - 1. 1. The cholinergic nerve endings of the electric organs of Torpedo ocellata contain presynaptic muscarinic acetylcholine receptors (mAChR) which regulate acetylcholine (ACh) release by negative feedback. 2. 2. The efficiency of this muscarinic regulation varies circannually: maximal inhibition is observed in the winter, much smaller effects in the fall and spring, and no effect is observed during the summer. 3. 3. These variations are accompanied by seasonal changes in the ability of the mAChR to trigger the synthesis of its second messenger (a prostaglandin E-like substance) and in the ability of exogenous prostaglandin E2 to inhibit ACh release. No seasonal changes were found in the number of presynaptic mAChRs. 4. 4. These findings suggest that the observed seasonal variations are due to changes in both the metabolism of prostaglandins in the electric organ and the sensitivity of the ACh-releasing apparatus to the muscarinic second messenger.
UR - http://www.scopus.com/inward/record.url?scp=0021832806&partnerID=8YFLogxK
U2 - 10.1016/0742-8413(85)90034-9
DO - 10.1016/0742-8413(85)90034-9
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AN - SCOPUS:0021832806
SN - 0306-4492
VL - 81
SP - 439
EP - 444
JO - Comparative biochemistry and physiology. C: Comparative pharmacology
JF - Comparative biochemistry and physiology. C: Comparative pharmacology
IS - 2
ER -