Document Detail


Leptin receptor expression in fetal lung increases in late gestation in the baboon: a model for human pregnancy.
MedLine Citation:
PMID:  15056773     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Leptin produced by both adipose tissue and the placental trophoblast, has been proposed to regulate numerous aspects of human conceptus development. Although recent animal studies have suggested an additional role for the polypeptide in fetal lung maturation, no evidence has been reported in primates. Therefore, we employed the baboon (Papio sp.), a well-characterized primate model for human pregnancy, to determine the presence and ontogeny of leptin receptor in fetal lung with advancing gestation. Lungs were collected from fetal baboons, early in gestation (days 58-62, n = 4), at mid gestation (days 98-102, n = 4), and late in gestation (days 158-165, n = 4) (term 184 days). mRNA transcripts for leptin (LEP) and both long and short intracellular domain isoforms of the leptin receptor (LEP-R(L) and LEP-R(S)) were assessed by RT-PCR. leptin receptor protein was evaluated by immunoblotting and cell types expressing leptin receptor were identified in late pregnancy by immunohistochemistry. Fetal serum leptin concentrations, determined by RIA, remained relatively unchanged at 5.7 +/- 1.1 ng/ml (mean +/- s.e.m.) in mid pregnancy and 8.4 +/- 3.0 ng/ml in late pregnancy (P > 0.05). Although leptin were detectable in fetal lung, no changes in transcript abundance were apparent with advancing gestation. However, transcripts for both LEP-R(L) and LEP-R(S) receptor isoforms increased several-fold (P < 0.05) in fetal lung between mid and late gestation, while leptin receptor protein was detectable only in late pregnancy. leptin receptor was localized in distal pulmonary epithelial cells, including type II pneumocytes. In conclusion, leptin is present in the fetal baboon and its receptor is enhanced during late gestation in cells responsible for the synthesis of pulmonary surfactant. Collectively, these and past findings may suggest a modulatory role for the polypeptide in pulmonary development and/or may identify leptin receptor as a physiological marker of primate fetal lung maturity.
Authors:
M C Henson; K F Swan; D E Edwards; G W Hoyle; J Purcell; V D Castracane
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Reproduction (Cambridge, England)     Volume:  127     ISSN:  1470-1626     ISO Abbreviation:  Reproduction     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-04-01     Completed Date:  2004-06-28     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  100966036     Medline TA:  Reproduction     Country:  England    
Other Details:
Languages:  eng     Pagination:  87-94     Citation Subset:  IM    
Affiliation:
Department of Obstetrics and Gynecology, Tulane University Health Sciences Center, New Orleans, Louisiana 70112, USA. henson@tulane.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Female
Fetal Blood / chemistry
Gestational Age
Humans
Immunoblotting
Immunohistochemistry / methods
Leptin / analysis,  blood,  genetics
Lung / chemistry,  embryology*
Models, Animal
Papio / physiology*
Pregnancy
Protein Isoforms / analysis,  genetics,  metabolism
RNA, Messenger / analysis
Receptors, Cell Surface / analysis,  genetics,  metabolism*
Receptors, Leptin
Reverse Transcriptase Polymerase Chain Reaction
Grant Support
ID/Acronym/Agency:
P51 RR00164/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
0/Leptin; 0/Protein Isoforms; 0/RNA, Messenger; 0/Receptors, Cell Surface; 0/Receptors, Leptin; 0/leptin receptor, human

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