Journal
DEVELOPMENT
Volume 138, Issue 20, Pages 4535-4544Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.071266
Keywords
Kidney; Basement membrane; Heparan sulfates; Integrin; Growth; Diabetes insipidus; Mouse
Categories
Funding
- National Institutes of Health [R37-DK36425, R01-DK065123, R01-DK075594, R01-DK65123]
- Foundation of UMDNJ
- AHA
- Department of Veterans Affairs
- George O'Brien Center
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In order to understand the functions of laminins in the renal collecting system, the Lamc1 gene was inactivated in the developing mouse ureteric bud (UB). Embryos bearing null alleles exhibited laminin deficiency prior to mesenchymal tubular induction and either failed to develop a UB with involution of the mesenchyme, or developed small kidneys with decreased proliferation and branching, delayed renal vesicle formation and postnatal emergence of a water transport deficit. Embryonic day 12.5 kidneys revealed an almost complete absence of basement membrane proteins and reduced levels of. 6 integrin and FGF2. mRNA levels for fibroblast growth factor 2 (FGF2) and mediators of the GDNF/RET and WNT11 signaling pathway were also decreased. Furthermore, collecting duct cells derived from laminin-deficient kidneys and grown in collagen gels were found to proliferate and branch slowly. The laminin-deficient cells exhibited decreased activation of growth factor-and integrin-dependent pathways, whereas heparin lyase-treated and beta 1 integrin-null cells exhibited more selective decreases. Collectively, these data support a requirement of gamma 1 laminins for assembly of the collecting duct system basement membrane, in which immobilized ligands act as solid-phase agonists to promote branching morphogenesis, growth and water transport functions.
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