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. 1994 Aug;112(4):1160–1166. doi: 10.1111/j.1476-5381.1994.tb13205.x

Muscarinic acetylcholine response in pyramidal neurones of rat cerebral cortex.

M Nishikawa 1, M Munakata 1, N Akaike 1
PMCID: PMC1910245  PMID: 7952877

Abstract

1. The effects of acetylcholine (ACh) on pyramidal neurons acutely dissociated from the rat cerebral cortex were studied in the whole-cell mode, by use of the nystatin-perforated patch recording configuration. 2. ACh induced a net inward current (IACh) accompanied by a membrane conductance decrease at a holding potential (VH) of -40 mV. IACh increased in a concentration-dependent manner with a half-maximum concentration (EC50) of 8.7 x 10(-7) M. 3. IACh mainly resulted from the suppression of the voltage- and time-dependent K+ current (M-current). 4. Muscarine and muscarinic agonists such as McN-A-343, oxotremorine and oxotremorine-M mimicked the ACh response. The potency was in the order of oxotremorine-M > McN-A-343 > or = muscarine > oxotremorine. 5. Pirenzepine shifted the concentration-response curve for ACh to the right and the corresponding Schild plot yielded a pA2 value of 7.81. Other muscarinic antagonists also reversibly blocked IACh in a concentration-dependent manner. The inhibitory potency was in the order of atropine > 4-DAMP > pirenzepine > AF-DX-116. 6. IACh could be induced normally even after pre-incubation of dissociated neurones in external solution with 200 ng ml-1 pertussis toxin (PTX) for 8 h, whereas the inhibitory effect of ACh on high-voltage-activated Ca2+ channels was completely abolished by the PTX treatment.

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Selected References

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