Mechanisms of angiotensin II-mediated regulation of aldosterone synthase expression in H295R human adrenocortical and rat adrenal glomerulosa cells

Mária Szekeres, Gábor Turu, Anna Orient, Bence Szalai, Katinka Süpeki, Miklós Cserzo, P. Várnai, L. Hunyady

Research output: Contribution to journalArticle

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Abstract

In adrenal zona glomerulosa cells angiotensin II (Ang II) is a key regulator of steroidogenesis. Our purpose was to compare the mechanisms of Ang II-induced changes in the expression level of early transcription factors NR4A1 (NGFIB) and NR4A2 (Nurr1) genes, and the CYP11B2 gene encoding aldosterone synthase in H295R human adrenocortical tumor cells and in primary rat adrenal glomerulosa cells. Real-time PCR studies have demonstrated that Ang II increased the expression levels of NR4A1 and NR4A2 in H295R cells within 1 h after stimulation, which persisted up to 6 h; whereas in rat adrenal glomerulosa cells the kinetics of the expression of these genes were more rapid and transient. Ang II also induced prolonged nuclear translocation of Nurr1 and NGFIB proteins in both cell types. Studies using MEK inhibitor (PD98059, 20 μM), protein kinase C inhibitor (BIM1, 3 μM) and calmodulin kinase (CAMK) inhibitor (KN93, 10 μM) revealed that in rat adrenal glomerulosa cells CAMK-mediated mechanisms play a predominant role in the regulation of CYP11B2. In accordance with earlier findings, in H295R cells MEK inhibition increased the expression of NR4A1, NR4A2 and CYP11B2 genes, however, it decreased the Ang II-induced gene expression levels, suggesting that ERK activation has a role in control of expression of these genes. No such mechanism was detected in rat glomerulosa cells. Sar1-Ile4-Ile8-AngII, which can cause G protein-independent ERK activation, also stimulated the expression of CYP11B2 in H295R cells. These data suggest that the previously reported CAMK-mediated stimulation of early transcription factors NGFIB and Nurr1 has a predominant role in Ang II-induced CYP11B2 activation in rat adrenal glomerulosa cells, whereas in H295R cells ERK activation and G protein-independent mechanisms also contribute to this process.

Original languageEnglish
Pages (from-to)244-253
Number of pages10
JournalMolecular and Cellular Endocrinology
Volume302
Issue number2
DOIs
Publication statusPublished - Apr 29 2009

Fingerprint

Cytochrome P-450 CYP11B2
Zona Glomerulosa
Angiotensin II
Rats
Calcium-Calmodulin-Dependent Protein Kinases
Genes
Chemical activation
Mitogen-Activated Protein Kinase Kinases
GTP-Binding Proteins
Transcription Factors
Time and motion study
Gene encoding
Gene Expression
Gene expression
Protein Kinase C
Tumors
Cells
Kinetics
Protein C Inhibitor
Protein Kinase Inhibitors

Keywords

  • Adrenal cortex
  • Aldosterone synthase
  • Angiotensin II
  • Calmodulin kinase
  • Gene expression

ASJC Scopus subject areas

  • Endocrinology
  • Molecular Biology
  • Biochemistry

Cite this

Mechanisms of angiotensin II-mediated regulation of aldosterone synthase expression in H295R human adrenocortical and rat adrenal glomerulosa cells. / Szekeres, Mária; Turu, Gábor; Orient, Anna; Szalai, Bence; Süpeki, Katinka; Cserzo, Miklós; Várnai, P.; Hunyady, L.

In: Molecular and Cellular Endocrinology, Vol. 302, No. 2, 29.04.2009, p. 244-253.

Research output: Contribution to journalArticle

Szekeres, Mária ; Turu, Gábor ; Orient, Anna ; Szalai, Bence ; Süpeki, Katinka ; Cserzo, Miklós ; Várnai, P. ; Hunyady, L. / Mechanisms of angiotensin II-mediated regulation of aldosterone synthase expression in H295R human adrenocortical and rat adrenal glomerulosa cells. In: Molecular and Cellular Endocrinology. 2009 ; Vol. 302, No. 2. pp. 244-253.
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AU - Szalai, Bence

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AU - Cserzo, Miklós

AU - Várnai, P.

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