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TRPV4 activity regulates nuclear Ca 2+ and transcriptional functions of β‐catenin in a renal epithelial cell model
Author(s) -
EspadasÁlvarez Heidi,
MartínezRendón Jacqueline,
Larre Isabel,
MatamorosVolante Arturo,
RomeroGarcía Tatiana,
Rosenbaum Tamara,
Rueda Angélica,
GarcíaVillegas Refugio
Publication year - 2021
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.30096
Subject(s) - trpv4 , microbiology and biotechnology , wnt signaling pathway , cytoplasm , catenin , nucleus , transcription factor , chemistry , wnt3a , homeostasis , biology , signal transduction , ion channel , biochemistry , gene , receptor
TRPV4 is a nonselective cationic channel responsive to several physical and chemical stimuli. Defects in TRPV4 channel function result in human diseases, such as skeletal dysplasias, arthropathies, and peripheral neuropathies. Nonetheless, little is known about the role of TRPV4 in other cellular functions, such as nuclear Ca 2+ homeostasis or Ca 2+ ‐regulated transcription. Here, we confirmed the presence of the full‐length TRPV4 channel in the nuclei of nonpolarized Madin‐Darby canine kidney cells. Confocal Ca 2+ imaging showed that activation of the channel increases cytoplasmic and nuclear Ca 2+ leading to translocation of TRPV4 out of the nucleus together with β‐catenin, a transcriptional regulator in the Wnt signaling pathway fundamental in embryogenesis, organogenesis, and cellular homeostasis. TRPV4 inhibits β‐catenin transcriptional activity through a direct interaction dependent upon channel activity. This interaction also occurs in undifferentiated osteoblastoma and neuroblastoma cell models. Our results suggest a mechanism in which TRPV4 may regulate differentiation in several cellular contexts.