PCP4: A regulator of aldosterone synthesis in human adrenocortical tissues

Saulo J.A. Felizola, Yasuhiro Nakamura, Yoshikiyo Ono, Kanako Kitamura, Kumi Kikuchi, Yoshiaki Onodera, Kazue Ise, Kei Takase, Akira Sugawara, Namita Hattangady, William E. Rainey, Fumitoshi Satoh, Hironobu Sasano

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Purkinje cell protein 4 (PCP4) is a calmodulin (CaM)-binding protein that accelerates calcium association and dissociation with CaM. It has been previously detected in aldosterone-producing adenomas (APA), but details on its expression and function in adrenocortical tissues have remained unknown. Therefore, we performed the immunohistochemical analysis of PCP4 in the following tissues: normal adrenal (NA; nZ15), APA (nZ15), cortisol-producing adenomas (nZ15), and idiopathic hyperaldosteronism cases (IHA; nZ5). APA samples (nZ45) were also submitted to quantitative RT-PCR of PCP4, CYP11B1, and CYP11B2, as well as DNA sequencing for KCNJ5 mutations. Transient transfection analysis using PCP4 siRNA was also performed in H295R adrenocortical carcinoma cells, following ELISA analysis, and CYP11B2 luciferase assays were also performed after PCP4 vector transfection in order to study the regulation of PCP4 protein expression. In our findings, PCP4 immunoreactivity was predominantly detected in APA and in the zona glomerulosa of NA and IHA. In APA, the mRNA levels of PCP4 were significantly correlated with those of CYP11B2 (P!0.0001) and were significantly higher in cases with KCNJ5 mutation than WT (PZ0.005). Following PCP4 vector transfection, CYP11B2 luciferase reporter activity was significantly higher than controls in the presence of angiotensin-II. Knockdown of PCP4 resulted in a significant decrease in CYP11B2 mRNA levels (PZ0.012) and aldosterone production (PZ0.011). Our results indicate that PCP4 is a regulator of aldosterone production in normal, hyperplastic, and neoplastic human adrenocortical cells.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalJournal of Molecular Endocrinology
Volume52
Issue number2
DOIs
Publication statusPublished - 2014 Jan 8

Keywords

  • Adrenal cortex
  • Aldosterone
  • CYP11B2
  • Calmodulin (CAM)
  • Purkinje cell protein 4 (PCP4)

ASJC Scopus subject areas

  • Molecular Biology
  • Endocrinology

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