Document Detail


Expression of Angiotensin II Receptor-like 1 in the Placentas of Pregnancy-induced Hypertension.
MedLine Citation:
PMID:  22498939     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Angiotensin II receptor-like 1 (APJ), a G protein-coupled receptor that was identified as a homologue of angiotensin II type 1 (AT1) receptor, exerts antagonistic effects on AT1-mediated vasoconstriction. Studies on pregnancy-induced hypertension (PIH) revealed aberrant activation of AT1 downstream signaling. In contrast, little is known about APJ in the pathophysiology of human pregnancy. In this study, we investigated APJ expression in normal human and PIH placentas. mRNAs were extracted from 50 placental villous tissues of 18 cases with severe PIH (8 late-onset, 4 early-onset, and 6 superimposed PIH) and 32 control pregnancies (including 6 preterm cases). Histopathologic studies were conducted using paraffin-embedded placental tissues from 12 control placentas (from 23 to 39 wk) and 23 PIH placentas (from 24 to 41 wk). Reverse transcriptase-polymerase chain reaction showed that APJ was cooperatively expressed with its ligand apelin and AT1 in controls and in late-onset PIH placentas but was significantly downregulated in early-onset PIH placentas with poor fetal growth. Quantitative reverse transcriptase-polymerase chain reaction analysis revealed upregulated APJ in late-onset PIH placentas but significantly downregulated APJ in early-onset PIH. In immunohistochemical staining, APJ was detected strongly in villous capillary endothelial cells and trophoblasts of late-onset PIH placentas. In contrast, APJ was poorly stained in endothelial cells of hypoplastic villi of early-onset PIH placentas. Collective data indicate that the apelin-APJ system is involved in fetoplacental circulation during human pregnancy. Impaired APJ expression in early-onset PIH placentas may reflect an aggravated placental condition with poor fetal growth.
Authors:
Mitsuko Furuya; Mika Okuda; Hirokazu Usui; Toshinao Takenouchi; Daisuke Kami; Akinori Nozawa; Makio Shozu; Akihiro Umezawa; Tsuneo Takahashi; Ichiro Aoki
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-10
Journal Detail:
Title:  International journal of gynecological pathology : official journal of the International Society of Gynecological Pathologists     Volume:  -     ISSN:  1538-7151     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8214845     Medline TA:  Int J Gynecol Pathol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Departments of Molecular Pathology (M.F., D.K., I.A.), Yokohama City University Graduate School of Medicine Obstetrics (M.O., T.T.) Pathology (A.N.), Yokohama City University Medical Center, Yokohama Departments of Obstetrics and Gynecology (H.U., M.S.), Chiba University Graduate School of Medicine, Chiba Department of Pathology (T.T.), Sapporo General Hospital, Sapporo Department of Reproductive Biology (D.K., A.U.), National Institute for Child Health and Development, Tokyo, Japan.
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