Abstract
Down regulation of Ca channels by neurotransmitters is predominant in nerve cells in contrast to the up regulation found in muscle preparations. Involvement of GTP-binding proteins in the inhibitory modulation of Ca channel is usually supported by one or more of the following observations: (1) The non-hydrolysable GTP analogue, GTPγS, reproduces the inhibitory action of external neurotransmitters (Dolphin and Scott, 1987), (2) Ca channel modulation by neurotransmitters and GTPγS is prevented by cell incubation with pertussis toxin (PTX) (Lewis et al., 1986; Toselli and Lux, 1990), (3) intracellularly applied purified Go and Gi-proteins or subunits revive the receptor mediated responsiveness in PTX-treated cells (Toselli and Lux, 1989), and (4) monoclonal antibodies against G-protein subunits prevent neurotransmitter-induced inhibition of the Ca currents (Harris-Warwick et al., 1989; McFadzean et al., 1989). The block of Ca currents predominantly affects the high voltage activated types. It is usually manifested by a slowing of the rise of current in response to a depolarizing voltage step. The current then settles to some steady state with reduced amplitudes. G-protein mediated inhibitory actions on HVA Ca currents are suggested for a variety of cells and different transmitters and drugs (Table 1).
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© 1992 Springer-Verlag Berlin Heidelberg
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Lux, H.D., Tokutomi, N., Grassi, F. (1992). Kinetics of a G-Protein Mediated Action on Neuronal Ca2+ Channels. In: Morad, M., Agus, Z. (eds) Intracellular Regulation of Ion Channels. NATO ASI Series, vol 60. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84628-1_16
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DOI: https://doi.org/10.1007/978-3-642-84628-1_16
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