Transient receptor potential ankyrin 1 channels are involved in spontaneous peptide hormone release from astrocytes.

Abstract:

:Astrocytes, a large population of glial cells, detect neurotransmitters and respond by increasing intracellular Ca2+ concentration ([Ca2+]i) and releasing chemical molecules called gliotransmitters. Recently discovered Ca2+ influx through transient receptor potential ankyrin 1 (TRPA1) channels is reported to cause spontaneous [Ca2+]i increase in astrocytes. While several physiological functions of TRPA1-mediated spontaneous Ca2+ signal have been revealed, relation with gliotransmitter release, especially peptide hormone exocytosis is largely unknown. We therefore explored the [Ca2+]i and exocytosis dynamics in rat astrocyte cell line C6 cells and primary astrocytes. TRPA1-mediated spontaneous [Ca2+]i transients were observed in both C6 cells and primary astrocytes. Total internal reflection fluorescence microscopy revealed that Venus-tagged brain-derived neurotrophic factor and neuropeptide Y were released spontaneously from astrocytes. Activation of TRPA1 channels enhanced the frequency of peptide hormone exocytosis, and inhibition of TRPA1 channels decreased the number of peptide hormone exocytosis. These results suggest that TRPA1-mediated spontaneous [Ca2+]i increase modulates the spontaneous release of peptide hormones from astrocytes.

authors

Takizawa M,Harada K,Nakamura K,Tsuboi T

doi

10.1016/j.bbrc.2018.05.097

subject

Has Abstract

pub_date

2018-07-02 00:00:00

pages

988-995

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(18)31160-4

journal_volume

501

pub_type

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