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Vol.62 (2016) >

Please use this identifier to cite or link to this item: http://ir.fmu.ac.jp/dspace/handle/123456789/517

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Title: Differential effects of lysophosphatidylcholine and ACh on muscarinic K+,non-selective cation and Ca2+ currents in guinea-pig atrial cells
Authors: Li, Libing
Matsuoka, Isao
Sakamoto, Kazuho
Kimura, Junko
Affiliation: 薬理学講座
Source title: Fukushima Journal of Medical Science
Volume: 62
Issue: 1
Start page: 27
End page: 35
Issue Date: 2016
Abstract: We compared the effects of lysophosphatidylcholine (LPC) and acetylcholine (ACh) on IK(ACh), ICa and a non-selective cation current (INSC) in guinea-pig atrial myocytes to clarify whether LPC and ACh activate similar Gi/o-coupled effector systems. IK(ACh), ICa and INSC were analyzed in single atrial myocytes by the whole cell patch-clamp. LPC induced INSC in a concentration-dependent manner in atrial cells. ACh activated IK(ACh), but failed to evoke INSC. LPC also activated IK(ACh) but with significantly less potency than ACh. The effects of both ligands on IK(ACh) were inhibited by intracellular loading of pre-activated PTX. This treatment also inhibited LPC-induced INSC, indicating that IK(ACh) and INSC induced by LPC are both mediated by Gi/o. LPC and ACh had similar potencies in inhibiting ICa, which was pre-augmented by forskolin, indicating that LPC and ACh activate similar amounts of α-subunits of Gi/o. The different effects of LPC and ACh on IK(ACh) and INSC may suggest that LPC and ACh activate Gi/o having different types of βγ subunits, and that LPC-induced INSC may be mediated by βγ subunits of Gi/o, which are less effective in inducing IK(ACh).
Publisher: The Fukushima Society of Medical Science
Publisher (Alternative foam): 福島医学会
language: eng
URI: http://ir.fmu.ac.jp/dspace/handle/123456789/517
Full text URL: http://ir.fmu.ac.jp/dspace/bitstream/123456789/517/1/FksmJMedSci_62_p27.pdf
ISSN: 0016-2590
DOI: 10.5387/fms.2015-23
PubMed ID: 26911304
Related Page: http://doi.org/10.5387/fms.2015-23
Rights: © 2016 The Fukushima Society of Medical Science
Appears in Collections:Vol.62 (2016)

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