PMID:11798066

Citation	Durbeej, M, Talts, JF, Henry, MD, Yurchenco, PD, Campbell, KP and Ekblom, P (2001) Dystroglycan binding to laminin alpha1LG4 module influences epithelial morphogenesis of salivary gland and lung in vitro. Differentiation 69:121-34
Abstract	Dystroglycan is a receptor for the basement membrane components laminin-1, -2, perlecan, and agrin. Genetic studies have revealed a role for dystroglycan in basement membrane formation of the early embryo. Dystroglycan binding to the E3 fragment of laminin-1 is involved in kidney epithelial cell development, as revealed by antibody perturbation experiments. E3 is the most distal part of the carboxyterminus of laminin alpha1 chain, and is composed of two laminin globular (LG) domains (LG4 and LG5). Dystroglycan-E3 interactions are mediated solely by discrete domains within LG4. Here we examined the role of this interaction for the development of mouse embryonic salivary gland and lung. Dystroglycan mRNA was expressed in epithelium of developing salivary gland and lung. Immunofluorescence demonstrated dystroglycan on the basal side of epithelial cells in these tissues. Antibodies against dystroglycan that block binding of alpha-dystroglycan to laminin-1 perturbed epithelial branching morphogenesis in salivary gland and lung organ cultures. Inhibition of branching morphogenesis was also seen in cultures treated with polyclonal anti-E3 antibodies. One monoclonal antibody (mAb 200) against LG4 blocked interactions between a-dystroglycan and recombinant laminin alpha1LG4-5, and also inhibited salivary gland and lung branching morphogenesis. Three other mAbs, also specific for the alpha1 carboxyterminus and known not to block branching morphogenesis, failed to block binding of alpha-dystroglycan to recombinant laminin alpha1LG4-5. These findings clarify why mAbs against the carboxyterminus of laminin alpha1 differ in their capacity to block epithelial morphogenesis and suggest that dystroglycan binding to alpha1LG4 is important for epithelial morphogenesis of several organs.
Links	PubMed Online version:10.1046/j.1432-0436.2001.690206.x
Keywords	Animals; Antibodies, Blocking/immunology; Antibodies, Monoclonal/immunology; Binding Sites; Cytoskeletal Proteins/genetics; Cytoskeletal Proteins/immunology; Cytoskeletal Proteins/metabolism; Dystroglycans; Laminin/immunology; Laminin/metabolism; Lung/embryology; Lung/ultrastructure; Membrane Glycoproteins/genetics; Membrane Glycoproteins/immunology; Membrane Glycoproteins/metabolism; Mice; Protein Binding; Protein Structure, Tertiary/physiology; RNA, Messenger/metabolism; Receptors, Laminin/metabolism; Respiratory Mucosa/embryology; Salivary Glands/embryology; Salivary Glands/ultrastructure
edit table

Annotations

Gene product	Qualifier	GO ID	GO term name	Evidence Code	with/from	Aspect	Notes	Status
edit table

References

See Help:References for how to manage references in GONUTS.