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Department of Pathology, Northwestern University Medical School, Chicago, Illinois 60611
The role of fibrillin-1 in metanephrogenesis was investigated.
Fibrillin-1 cDNA was isolated from the rat kidney cDNA
library and sequenced, and its spatiotemporal expression was studied. It had ~88% homology with human fibrillin-1 and had
Ca2+ binding epidermal growth
factor-like domains, transforming growth factor-
binding protein
motifs, and an RGD binding site. Northern blot analysis revealed an
~10-kb transcript, and fibrillin-1 expression was developmentally
regulated. In situ hybridization and immunofluorescence studies
indicated that at day 15 of gestation,
fibrillin-1 is expressed in the metanephric mesenchyme. At
day 18, its expression was confined to
nascent blood vessels and glomeruli, and it increased in the newborn
and neonatal kidneys. Immunoprecipitation revealed an ~300-kDa band
by SDS-PAGE. Treatment with fibrillin-1 antisense oligodeoxynucleotide
induced marked dysmorphogenesis of the embryonic metanephroi.
Concomitantly, the fibrillin-1 mRNA, antibody reactivity in the
metanephroi, and fibrillin-1-specific radioincorporation were reduced.
These data indicate that, like
v
3
integrin, a known morphogen and a putative receptor of fibrillin-1, the
fibrillin-1 modulates events related to early organogenesis and
possibly also the vascularization of the rat kidney.
fibrillin; complementary deoxyribonucleic acid cloning; extracellular matrix
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