Document Detail


Morphological and electrical properties of human trophoblast choriocarcinoma, BeWo cells.
MedLine Citation:
PMID:  18420268     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The syncytiotrophoblast of the human placenta arises from fusion of stem cells called cytotrophoblasts. The molecular mechanisms associated with cell fusion and syncytiation of cytotrophoblastic cells remain largely unknown. In the present study, we investigated the morphological and electrical properties of BeWo cells, a human choriocarcinoma-derived trophoblast cell model, with several features of the human cytotrophoblast. Cultured cells tended to cluster, but only fused into small, multinucleated syncytia in the presence of cAMP (72 h). The morphological features of both the actin and microtubular cytoskeletons indicated that within 72 h of constant exposure to cAMP, intracellular cortical actin cytoskeleton disappeared, which was the most prominent inducing factor of multi-nucleation. The presence of the cation channel protein, polycystin-2 (PC2), a TRP-type cation channel, associated with placental ion transport in term human syncytiotrophoblast, co-localised with acetylated tubulin in midbodies, but was found non-functional under any conditions. Different electrical phenotypes were observed among control BeWo cells, where only 26% (8 of 31 cells) displayed a voltage-dependent outwardly rectifying conductance. Most quiescent BeWo cells had, however, a low, slightly outwardly rectifying basal whole cell conductance. Acute exposure to intracellular cAMP (<15 min) increased the whole cell conductance by 122%, from 0.72 nS/cell to 1.60 nS/cell, and eliminated the voltage-regulated conductance. The encompassed evidence indicates that the early events in BeWo cell fusion and syncytiation occur by cAMP-associated changes in ionic conductance but not morphological changes associated to chronic exposure to the second messenger. This suggests a tight regulation, and important contribution of cation conductances in cytotrophoblastic cells prior to syncytiation.
Authors:
A J Ramos; M R Cantero; P Zhang; M K Raychowdhury; A Green; D MacPhee; H F Cantiello
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-04-16
Journal Detail:
Title:  Placenta     Volume:  29     ISSN:  0143-4004     ISO Abbreviation:  Placenta     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-26     Completed Date:  2008-08-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  492-502     Citation Subset:  IM    
Affiliation:
Nephrology Division and Electrophysiology Core, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA.
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MeSH Terms
Descriptor/Qualifier:
Cell Line, Tumor
Choriocarcinoma / pathology,  physiopathology*
Cyclic AMP / pharmacology
Cytoskeleton / metabolism,  pathology
Electrophysiology
Female
Humans
Immunohistochemistry
Membrane Potentials / drug effects
Pregnancy
Trophoblasts / pathology*,  physiology*
Uterine Neoplasms / pathology,  physiopathology*
Chemical
Reg. No./Substance:
60-92-4/Cyclic AMP

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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