Hypoxia reduces atrial natriuretic peptide clearance receptor gene expression in ANP knockout mice

Ju Zhong Sun, Shi Juan Chen, Guohong Li, Yiu Fai Chen

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

We tested the hypotheses that hypoxic exposure is associated with exacerbated pulmonary hypertension and right ventricular (RV) enlargement, reduced atrial natriuretic peptide (AMP) clearance receptor (NPR-C) expression, and enhanced B-type natriuretic peptide (BNP) expression in the absence of AMP. Male wild-type [AMP(+/+)], heterozygous [AMP(+/-)], and homozygous [AMP(-/-)] mice were studied after a 5-wk hypoxic exposure (10% O2). Hypoxia increased RV AMP mRNA and plasma AMP levels only in AMP(+/+) and AMP(+/-) mice. Hypoxia-induced increases in RV pressure were significantly greater in AMP(-/-) than in AMP(+/+) or AMP(+/-) mice (104 ± 17 vs. 45 ± 10 and 63 ± 7%, respectively) as were increases in RV mass (38 ± 4 vs. 26 ± 5 and 29 ± 4%, respectively). NPR-C mRNA levels were greatly reduced in the kidney, lung, and brain by hypoxia in all three genotypes. RV BNP mRNA and lung and kidney cGMP levels were increased in hypoxic mice. These findings indicate that disrupted AMP expression worsens hypoxic pulmonary hypertension and RV enlargement but does not alter hypoxia-induced decreases in NPR-C and suggest that compensatory increases in BNP expression occur in the absence of AMP.

Original languageEnglish (US)
Pages (from-to)L511-L519
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume279
Issue number3 23-3
DOIs
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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