Document Detail


Non-local models for the formation of hepatocyte-stellate cell aggregates.
MedLine Citation:
PMID:  20709085     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Liver cell aggregates may be grown in vitro by co-culturing hepatocytes with stellate cells. This method results in more rapid aggregation than hepatocyte-only culture, and appears to enhance cell viability and the expression of markers of liver-specific functions. We consider the early stages of aggregate formation, and develop a new mathematical model to investigate two alternative hypotheses (based on evidence in the experimental literature) for the role of stellate cells in promoting aggregate formation. Under Hypothesis 1, each population produces a chemical signal which affects the other, and enhanced aggregation is due to chemotaxis. Hypothesis 2 asserts that the interaction between the two cell types is by direct physical contact: the stellates extend long cellular processes which pull the hepatocytes into the aggregates. Under both hypotheses, hepatocytes are attracted to a chemical they themselves produce, and the cells can experience repulsive forces due to overcrowding. We formulate non-local (integro-partial differential) equations to describe the densities of cells, which are coupled to reaction-diffusion equations for the chemical concentrations. The behaviour of the model under each hypothesis is studied using a combination of linear stability analysis and numerical simulations. Our results show how the initial rate of aggregation depends upon the cell seeding ratio, and how the distribution of cells within aggregates depends on the relative strengths of attraction and repulsion between the cell types. Guided by our results, we suggest experiments which could be performed to distinguish between the two hypotheses.
Authors:
J E F Green; S L Waters; J P Whiteley; L Edelstein-Keshet; K M Shakesheff; H M Byrne
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-13
Journal Detail:
Title:  Journal of theoretical biology     Volume:  267     ISSN:  1095-8541     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-09-27     Completed Date:  2011-01-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  106-20     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
Affiliation:
Computational Biology Group, School of Computer Science and Software Engineering, Faculty of Engineering, Computing and Mathematics, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia. edward.green@uwa.edu.au
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MeSH Terms
Descriptor/Qualifier:
Animals
Cell Adhesion
Cell Communication*
Chemotaxis
Coculture Techniques
Hepatic Stellate Cells / cytology*
Hepatocytes / cytology*
Humans
Kinetics
Models, Theoretical*
Grant Support
ID/Acronym/Agency:
//Biotechnology and Biological Sciences Research Council

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


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