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Effects of depolarizing agents on transglutaminase activity, Ca2+ influx, and protein synthesis in superior cervical and nodose ganglia excised from rats

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Molecular and Chemical Neuropathology

Abstract

Rapid changes in transglutaminase (TG) activity,45Ca2+ — influx and [3H]leucine incorporation in superior cervical ganglia (SCG), and nodose ganglia (NG) excised from adult rats were examined following addition of membrane-depolarizing agents veratridine (Ver) or high extracellular [K+]o during aerobic incubation in vitro at 37°C. Addition of KCl (50mM) stimulated TG activity to a maximal extent (four to sixfold) in SCG and NG after 30 min. Ver (0.2 mM) also increased TG activity in both ganglia after 30 min. Kinetic studies showed that the stimulation of TG activity in both ganglia caused by each depolarization condition was associated with a decrease inK m and an increase inV max value. The depolarizing agents Ver and high [K+]o also caused significant increases in45Ca2+ influx into both ganglia. The Ver-induced increases in TG activity and45Ca2+ accumulation were antagonized by tetrodotoxin (TTX, 1 μM), a sodium channel blocker. The K+-induced increase in TG activity was not blocked by tetraethylammonium (TEA, 20 mM), a potassium channel antagonist, although TEA did block the K+-induced increase in45Ca2+ accumulation. The membrane-perturbing, sialic acid-containing compounds, GM1-ganglioside (GM1, 5 nM) and α-sialyl cholesterol (α-SC, 20 μM), were moderate inhibitors of the K+-induced effects on TG activity and45Ca2+ accumulation. The sialyl compounds had little effect on Ver-induced accumulation of45Ca2+ but enhanced the Ver-evoked stimulation in TG activity. These results suggests that the veratridine-and K+-induced increases in TG activity occur via modulation of Ca2+ and Na+ channel gating mechanisms that are pharmacologically distinct for each depolarizing agent. The veratridine- and K+-induced decrease in [3H]leucine incorporation could be a result of stimulation of TG activity as a consequence of degenerative alterations.

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Abbreviations

SCG:

superior cervical (sympathetic) ganglia

NG:

nodose ganglia

TG:

transglutaminase

HEPES:

N-2-hydroxyethylpiperazine-N′-ethanesulfonic acid

GM1:

ganglioside

GM1:

ganglioside, GM1

α-SC:

α-sialyl cholesterol

TTX:

tetrodotoxin

TEA:

tetraethylammonium

TCA:

trichloroacetic acid

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Authors and Affiliations

  1. Department of Physiology, Fujita Health University School of Medicine, 470-11, Toyoake, Aichi, Japan

    Masato Ando & Yutaka Nagata

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  1. Masato Ando
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  2. Yutaka Nagata
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Ando, M., Nagata, Y. Effects of depolarizing agents on transglutaminase activity, Ca2+ influx, and protein synthesis in superior cervical and nodose ganglia excised from rats. Molecular and Chemical Neuropathology 19, 121–135 (1993). https://doi.org/10.1007/BF03160173

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  • DOI: https://doi.org/10.1007/BF03160173

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