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Characterization of muscarinic acetylcholine receptors on intact neuroblastoma × glioma NG108-15 cell upon induced differentiation

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Summary

Studies have established that major increases in muscarinic acetylcholine receptor (mAchR) binding in the brain appear to coincide with synaptogenesis. The neuroblastoma × glioma hybrid NG108-15 cell line has been demonstrated to possess numerous functional characteristics of intact neurons, including synapse formation with myotubes. The present study examines and characterizes the mAchR on the hybrid NG108-15 cells during differentiation, induced by 1 mM dBcAMP. Specific binding of [3H]-QNB for differentiated cells increases gradually to a final level of 130% (P < 0.05) over the control undifferentiated cells during the first 24 hr of incubation. Further, this increase of receptor sites appears to correlate proportionately to the degree of neurite extension of the differentiating cells. The dissociation rate constant at equilibrium (Kd) and maximum binding capacity (Bmax) have been determined to be 5.6 nM and 920 fmol/106 cells, respectively, for differentiated cells, and 4.4 nM and 400 fmol/106 cells, respectively, for undifferentiated cells. Computer analyses of the data obtained from saturation experiments reveal a single class of binding sites for [3H]-QNB on both differentiated and undifferentiated cells. The Hill plot analysis of the QNB-binding indicates a Hill coefficient (nH) of 1.0 and 0.91 for differentiated and undifferentiated cells, respectively, suggesting the unity of receptor sites with no co-operativity. Our results depict that increases of mAchRs on intact cells correlate with the degree of cellular differentiation.

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  1. Department of Physiology, University of Manitoba, R3E 0W3, Winnipeg, Manitoba, Canada

    A. Ghahary & K. W. Cheng

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  1. A. Ghahary
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  2. K. W. Cheng
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Ghahary, A., Cheng, K.W. Characterization of muscarinic acetylcholine receptors on intact neuroblastoma × glioma NG108-15 cell upon induced differentiation. Mol Cell Biochem 86, 181–188 (1989). https://doi.org/10.1007/BF00222618

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  • DOI: https://doi.org/10.1007/BF00222618

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