Enhanced expression of bone morphogenetic protein system in aldosterone-treated mouse kidneys

Jiro Suzuki, Fumio Otsuka, Yoshinori Matsumoto, Kenichi Inagaki, Tomoko Miyoshi, Masaya Takeda, Naoko Tsukamoto, Eri Nakamura, Kanako Ogura, Hirofumi Makino

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Recent studies have shown that bone morphogenetic proteins (BMPs), particularly BMP-7, have an inhibitory role in the development of various renal diseases. We previously reported antagonistic effects of BMPs on renal mesangial cell proliferation induced by aldosterone (Aldo) in vitro. In the present study, we investigated in vivo roles of BMPs in Aldo-induced renal glomerular injury. BALB/c mice aged 6 weeks were treated with Aldo injection (5 g per day, intraperitoneally) and/or oral administration of high-salt (2%) water for 9 weeks. Systemic blood pressure, body weight, kidney weight and daily proteinuria were not significantly changed by Aldo and/or high-salt treatment. However, renal histological examination revealed increases in glomerular cellularity and glomerular diameter in the groups treated with Aldo injection and high-salt administration. Immunohistochemistry demonstrated expression of BMP-4 and-7 in the glomerular mesangial region. Aldo causes renal glomerular damage by stimulating mesangial cell proliferation and increasing extracellular matrix via the mineralocorticoid receptor (MR). MR messenger RNA (mRNA) expression in the renal cortex was transiently increased by 3-week treatment with Aldo and high-salt intake, but was decreased by 9-week treatment. Furthermore, the expression levels of BMP-4 and-7 mRNA were enhanced in the renal cortex treated with Aldo and high-salt administration. These findings suggest that the renal BMP system is activated by Aldo under the condition of high-salt exposure, which may have a key role in antagonizing glomerular damage in vivo.

Original languageEnglish
Pages (from-to)312-317
Number of pages6
JournalHypertension Research
Volume35
Issue number3
DOIs
Publication statusPublished - Mar 1 2012

Keywords

  • aldosterone
  • bone morphogenetic protein (BMP)
  • glomerulus
  • kidney
  • salt-sensitive hypertension

ASJC Scopus subject areas

  • Internal Medicine
  • Physiology
  • Cardiology and Cardiovascular Medicine

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