A novel laminin subunit chain, gamma3, has been recently identified. Biochemical studies of gamma3 containing laminins show that gamma3 can associate with at least alpha2, alpha4, beta1, and beta2 subunit chains. The tissue distribution of gamma3 shows it to be present in regions not containing ultrastructurally defined basement membranes. These regions include the brain matrix and the apical surface of ciliated epithelial cells. The following specific aims describe proposed intentions to test the hypothesis that gamma3 containing laminins form a unique matrix at these non-basement membrane sites, the function of which is to stabilize the cytoskeletal arrangements required for the assembly and stabilization of cilia, and to also provide a distensible matrix stabilizing the structure of the CNS. To test this hypothesis specific aims are proposed: (1) Carefully describe the anatomical distribution of gamma3 and other selected laminin chains, as well as of known matrix macromolecules and receptors in the brain and at ciliated epithelial surfaces during development and in the adult mouse; (2) Determine the molecular composition of gamma3 containing laminins in the brain and at ciliated epithelial surfaces. Chemical quantities of the appropriate laminins will be produced in cell culture and purified. (3) Potential interactions between molecules which colocalized spatially and temporally will be tested in vitro. Binding to potential receptors will be determined by cell binding studies. (4) A gamma3 null mouse will be generated by homologous recombination and the phenotype characterized. We will cross the gamma3 and beta2 heterozygous mice to produce the double KO. It is likely that these studies will provide the foundations for further study of a novel extracellular matrix. It is also possible that these studies will provide novel insights into the pathophysiology of neurodegenerative diseases and infertility.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
7R01NS039502-03
Application #
6499449
Study Section
Pathobiochemistry Study Section (PBC)
Program Officer
Nichols, Paul L
Project Start
2000-02-01
Project End
2004-06-30
Budget Start
2002-07-01
Budget End
2003-06-30
Support Year
3
Fiscal Year
2002
Total Cost
$375,707
Indirect Cost
Name
Tufts University
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02111
Radner, Stephanie; Banos, Charles; Bachay, Galina et al. (2013) ?2 and ?3 laminins are critical cortical basement membrane components: ablation of Lamb2 and Lamc3 genes disrupts cortical lamination and produces dysplasia. Dev Neurobiol 73:209-29
Li, Yong N; Pinzón-Duarte, Germán; Dattilo, Michael et al. (2012) The expression and function of netrin-4 in murine ocular tissues. Exp Eye Res 96:24-35
Li, Yong N; Radner, Stephanie; French, Margaret M et al. (2012) The ?3 chain of laminin is widely but differentially expressed in murine basement membranes: expression and functional studies. Matrix Biol 31:120-34
Hirrlinger, Petra G; Pannicke, Thomas; Winkler, Ulrike et al. (2011) Genetic deletion of laminin isoforms ?2 and ?3 induces a reduction in Kir4.1 and aquaporin-4 expression and function in the retina. PLoS One 6:e16106
Pinzon-Duarte, German; Daly, Gerard; Li, Yong N et al. (2010) Defective formation of the inner limiting membrane in laminin beta2- and gamma3-null mice produces retinal dysplasia. Invest Ophthalmol Vis Sci 51:1773-82
Egles, Christophe; Claudepierre, Thomas; Manglapus, Mary K et al. (2007) Laminins containing the beta2 chain modulate the precise organization of CNS synapses. Mol Cell Neurosci 34:288-98
Aisenbrey, Sabine; Zhang, Minlei; Bacher, Daniel et al. (2006) Retinal pigment epithelial cells synthesize laminins, including laminin 5, and adhere to them through alpha3- and alpha6-containing integrins. Invest Ophthalmol Vis Sci 47:5537-44
Claudepierre, Thomas; Manglapus, Mary K; Marengi, Nathan et al. (2005) Collagen XVII and BPAG1 expression in the retina: evidence for an anchoring complex in the central nervous system. J Comp Neurol 487:190-203
Koch, Manuel; Schulze, Joerg; Hansen, Uwe et al. (2004) A novel marker of tissue junctions, collagen XXII. J Biol Chem 279:22514-21
Hunter, Dale D; Zhang, Minlei; Ferguson, Jill W et al. (2004) The extracellular matrix component WIF-1 is expressed during, and can modulate, retinal development. Mol Cell Neurosci 27:477-88

Showing the most recent 10 out of 12 publications