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Published 24 June 2002. doi:10.1083/jcb.200203073
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© The Rockefeller University Press, 0021-9525/2002/6/1279 $5.00
The Journal of Cell Biology, Volume 157, Number 7, June 24, 2002 1279-1290


Article

Matrix assembly, regulation, and survival functions of laminin and its receptors in embryonic stem cell differentiation

Shaohua Li1, David Harrison1, Salvatore Carbonetto2,3, Reinhard Fässler4, Neil Smyth5, David Edgar6 and Peter D. Yurchenco1

1 Department of Pathology and Laboratory Medicine, University of Medicine and Dentistry of New Jersey (UMDNJ), Robert Wood Johnson Medical School, Piscataway, NJ 08854
2 Department of Neurology and Neurosurgery, McGill University
3 Center for Neuroscience Research, Montréal General Hospital Research Institute, Montréal, Québec H3G 1A4, Canada
4 Max-Planck Institute for Biochemistry, D-8285 Martinsried, Germany
5 Institute for Biochemistry II, Medical Faculty, University of Cologne, D-50924 Cologne, Germany
6 Department of Human Anatomy and Cell Biology, University of Liverpool, Liverpool L69 3G3E, UK

Address correspondence to Peter D. Yurchenco, Dept. of Pathology and Laboratory Medicine, UMDNJ, Robert Wood Johnson Medical School, 675 Hoes Ln., Piscataway, NJ 08854. Tel.: (732) 235-5166. Fax: (732) 235-4825. E-mail: yurchenc{at}umdnj.edu

Laminin-1 is essential for early embryonic basement membrane assembly and differentiation. Several steps can be distinguished, i.e., the expression of laminin and companion matrix components, their accumulation on the cell surface and assembly into basement membrane between endoderm and inner cell mass, and the ensuing differentiation of epiblast. In this study, we used differentiating embryoid bodies derived from mouse embryonic stem cells null for {gamma}1-laminin, ß1-integrin and {alpha}/ß-dystroglycan to dissect the contributions of laminin domains and interacting receptors to this process. We found that (a) laminin enables ß1-integrin–null embryoid bodies to assemble basement membrane and achieve epiblast with ß1-integrin enabling expression of the laminin {alpha}1 subunit; (b) basement membrane assembly and differentiation require laminin polymerization in conjunction with cell anchorage, the latter critically dependent upon a heparin-binding locus within LG module-4; (c) dystroglycan is not uniquely required for basement membrane assembly or initial differentiation; (d) dystroglycan and integrin cooperate to sustain survival of the epiblast and regulate laminin expression; and (e) laminin, acting via ß1-integrin through LG1–3 and requiring polymerization, can regulate dystroglycan expression.

Key Words: basement membrane; gastrulation; integrin; dystroglycan; apoptosis


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