Document Detail

Evidence for the presence of N-formyl-methionyl-leucyl-phenylalanine (fMLP) receptor ligands in human amniotic fluid and fMLP receptor modulation by physiological labour.
MedLine Citation:
PMID:  16236365     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: The presence of amniotic binding sites for N-formyl-methionyl-leucyl-phenylalanine (fMLP), an inflammatory peptide, and its ability to induce prostaglandin E2 synthesis in the human amnion prompted us to investigate for: (1) the presence of fMLP receptor ligands (fMLPRL) in the amniotic fluid; (2) expression of the fMLP receptor in amniotic tissue; (3) the effect of amniotic fMLPRL on neutrophil cyclic AMP (cAMP) level and calcium concentration ([Ca2+]i) during physiological pregnancy and labour. METHODS: Binding assays were performed on neutrophils to determine the presence of fMLRL in the amniotic fluid at the 17th week of pregnancy, as well as at term, before and after the onset of labour. The expression of fMLP receptor mRNA was evaluated by RT-PCR, the cAMP level by a radiochemical assay, and the calcium concentration by Fura-2 AM fluorescence measurement. RESULTS: fMLPRLs were detectable in amniotic fluid throughout pregnancy, and their levels did not vary during gestation. Labour significantly increased both the amniotic fMLPRL level and the expression of fMLP receptor in amnion tissue. The increased amniotic fMLPRL concentration noted during labour significantly increased neutrophil cAMP level and [Ca2+]i. CONCLUSIONS: These findings demonstrate for the first time the presence of fMLP receptor ligands in amniotic fluid, and indicate a modulation of the fMLP system by the events of physiological labour.
Carla Biondi; Barbara Pavan; Alessandro Dalpiaz; Alessandra Valerio; Susanna Spisani; Fortunato Vesce
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-10-19
Journal Detail:
Title:  Journal of reproductive immunology     Volume:  68     ISSN:  0165-0378     ISO Abbreviation:  J. Reprod. Immunol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-12-06     Completed Date:  2006-03-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8001906     Medline TA:  J Reprod Immunol     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  71-83     Citation Subset:  IM    
Department of Biology, University of Ferrara, 44100 Ferrara, Italy.
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MeSH Terms
Amniotic Fluid / immunology*
Biological Assay / methods
Labor, Obstetric / immunology*
N-Formylmethionine Leucyl-Phenylalanine / analysis,  immunology*
Neutrophils / cytology,  immunology
Pregnancy / immunology*
RNA, Messenger / immunology
Receptors, Formyl Peptide / analysis,  immunology*
Reg. No./Substance:
0/Ligands; 0/RNA, Messenger; 0/Receptors, Formyl Peptide; 59880-97-6/N-Formylmethionine Leucyl-Phenylalanine

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