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. 1994 Apr 15;299(Pt 2):375–380. doi: 10.1042/bj2990375

Modulation of phosphatidylserine synthesis by a muscarinic receptor occupancy in human neuroblastoma cell line LA-N-1.

I S Mikhaevitch 1, I N Singh 1, G Sorrentino 1, R Massarelli 1, J N Kanfer 1
PMCID: PMC1138282  PMID: 8172597

Abstract

The incorporation of [3H]serine into lipids, water-soluble metabolites and proteins by the human neuroblastoma cell line LA-N-1 exposed to oxotremorine-M, a muscarinic agonist, was investigated. Oxotremorine-M increased the incorporation of this labelled precursor into phosphatidylserine and proteins in a concentration-dependent manner, with the maximal stimulation at 250 microM. This activation was blunted by 100 microM atropine. There were no detectable changes of the radioactivity in the water-soluble metabolites. Acetylcholine, another muscarinic agonist, slightly decreased the serine incorporation into lipids, but did not affect the protein or water-soluble compartments. Several other muscarinic agonists, including 250 microM pilocarpine, 100 microM McN-A-343 and 1 mM carbachol, did not effect these [3H]serine incorporations. Preincubation of cells with 1 mM oxotremorine M, or 1 mM carbachol, or 1 mM McN-A-343, for 4 h prevented the oxotremorine-M-induced increase of serine incorporation. These observations are consistent with the oxotremorine-M action being mediated by muscarinic-receptor occupancy. The G-protein inhibitor guanosine 5'-[beta-thio]diphosphate (1 mM) and the G-protein activators, guanosine 5'-[gamma-thio]triphosphate (100 microM) and A1F3, prevented the oxotremorine stimulation. The muscarinic agonists, 250 microM oxotremorine-M, 1 mM carbamoylcholine and 500 microM acetylcholine, triggered the accumulation of inositol mono- and di-phosphates by cells that had been prelabelled with myo-[3H]inositol, and this phospholipase C activation was blunted by 100 microM atropine. The protein kinase C inhibitor H7 prevented the oxotremorine-M stimulation of serine incorporation. Over-night exposure of LA-N-1 cells to 100 nM phorbol 12-myristate 13-acetate resulted in a decrease of cytosolic protein kinase C activity, and prevented the oxotremorine-M stimulation of serine incorporation. Neither oxotremorine-M nor acetylcholine caused a redistribution of protein kinase C activity between the cytosol and membrane compartments. In addition, oxotremorine-M did not activate phospholipase D of the LA-N-1 cells.

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Selected References

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