Intracellular calcium elevation induced by extracellular application of cyclic-ADP-ribose or oxytocin is temperature-sensitive in rodent NG108-15 neuronal cells with or without exogenous expression of human oxytocin receptors.

Abstract:

:ADP-ribosyl cyclase and/or CD38 are activated after oxytocin receptor stimulation in the hypothalamus and pituitary in adult mice, leading to facilitation of oxytocin secretion. Although cyclic adenosine 5'-diphosphoribose (cADPR) primarily acts as an intracellular second messenger, it has been suggested that extracellular cADPR stimulates intracellular ryanodine receptors after internalisation via the nucleotide-transporting capacity of CD38 in fibroblasts and astrocytes. However, little is known about whether extracellular cADPR activates neurones. To address this question, we used a model neuronal cell line, NG108-15 mouse neuroblastoma x rat glioma hybrid cells possessing CD38 but not oxytocin receptors, and measured cytosolic free calcium concentrations ([Ca(2+)](i)). Extracellular application of cADPR to NG108-15 cells elevated [Ca(2+)](i) at 35 degrees C. The elevation was significantly enhanced when measured at 40 degrees C. The cADPR and heat-induced [Ca(2+)](i) increase were blocked under extracellular Ca(2+)-free conditions and by 2-aminoethoxydiphenyl borate, an antagonist of melastatin-related transient receptor potential channel 2 (TRPM2) cation channels. Reverse transcriptation-polymerase chain reaction analyses indicated that TRPM2 channels were expressed in NG108-15 cells. Application of oxytocin elevated [Ca(2+)](i) in NG108-15 cells transformed to transiently express cloned human oxytocin receptors. The oxytocin-induced [Ca(2+)](i) response was also enhanced by heat. These results indicate that the extracellular application of cADPR, together with heat, activates cation influx downstream of oxytocin receptor signalling in NG108-15 neuronal cells, and suggest the possible involvement of TRPM2 channels in oxytocin release in the mammalian brain.

journal_name

J Neuroendocrinol

authors

Amina S,Hashii M,Ma WJ,Yokoyama S,Lopatina O,Liu HX,Islam MS,Higashida H

doi

10.1111/j.1365-2826.2010.01978.x

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

460-6

issue

5

eissn

0953-8194

issn

1365-2826

pii

JNE1978

journal_volume

22

pub_type

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