p53 alters intracellular Ca 2+ signaling through regulation of TRPM4.

Autor: Kappel S; Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland. Electronic address: sven.kappel@ibmm.unibe.ch., Ross-Kaschitza D; Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland., Hauert B; Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland., Rother K; Division of Hepatology, Clinic for Oncology, Gastroenterology, Hepatology, Pulmonology and Infectious Diseases, University Hospital Leipzig, Leipzig, Germany., Peinelt C; Institute of Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland. Electronic address: christine.peinelt@ibmm.unibe.ch.
Jazyk: angličtina
Zdroj: Cell calcium [Cell Calcium] 2022 Jun; Vol. 104, pp. 102591. Date of Electronic Publication: 2022 Apr 19.
DOI: 10.1016/j.ceca.2022.102591
Abstrakt: Altered expression of transient receptor potential channel melastatin 4 (TRPM4) contributes to several diseases, including cardiac conduction disorders, immune diseases, and cancer. Yet the underlying mechanisms of TRPM4 expression changes remain elusive. In this study, we report that loss of tumor suppressor protein p53 or p63γ function or mutation of a putative p53 response element in the TRPM4 promoter region increase TRPM4 promoter activity in the colorectal cancer cell line HCT 116. In cells that lack p53 expression, we observed increased TRPM4 mRNA and protein levels and TRPM4-mediated Na + currents. This phenotype can be reversed by transient overexpression of p53. In the prostate cancer cell line LNCaP, which expresses p53 endogenously, p53 overexpression decreases TRPM4-mediated currents. As in other cancer cells, CRISPR-Cas9 mediated knockout of TRPM4 in p53 deficient HCT 116 cells results in increased store-operated Ca 2+ entry. The effect of the TRPM4 knockout is mimicked by p53 mediated suppression of TRPM4 in the parental cell line expressing TRPM4. In addition, a TRPM4 knockout-mediated shift in cell cycle is abolished upon loss of p53. Taken together, these findings indicate that p53 represses TRPM4 expression, thereby altering cellular Ca 2+ signaling and that TRPM4 adds to cell cycle shift dependent on p53 signaling. One sentence summary: TRPM4 is repressed in the p53 pathway leading to reduced currents and increased calcium signaling.
(Copyright © 2022. Published by Elsevier Ltd.)
Databáze: MEDLINE
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