Mice lacking the EDB segment of fibronectin develop normally but exhibit reduced cell growth and fibronectin matrix assembly in vitro

Tomohiko Fukuda, Nobuaki Yoshida, Yuki Kataoka, Ri-Ichiroh Manabe, Yoko Mizuno-Horikawa, Motohiko Sato, Kohji Kuriyama, Natsuo Yasui, Kiyotoshi Sekiguchi
2002 Cancer Research  
Fibronectins (FNs) are major cell-adhesive proteins in the extracellular matrix and are essential for embryonic development. FNs are encoded by a single gene, but heterogeneity is introduced by alternative pre-mRNA splicing. One of the alternatively spliced segments, extra domain B (EDB), is prominently expressed during embryonic development and in tumor tissues, although it is mostly eliminated from FN in normal adult tissues. To examine the function of the EDB segment in vivo, we generated
more » ... vo, we generated mice lacking the EDB exon using the Cre-loxP system. Although EDB-containing FNs are highly expressed throughout early embryogenesis, EDB-deficient mice developed normally and were fertile. Despite the absence of any significant phenotypes observed in vivo, however, fibroblasts obtained from EDB-deficient mice grew slowly in vitro and deposited less FN in the pericellular matrix than fibroblasts from wild-type mice. These results indicate that expression of EDB-containing isoforms is dispensable during embryonic development, yet may play a modulating role in the growth of connective tissue cells via the FN matrix.
pmid:12359774 fatcat:hkjx4srtzrhjjmac4s524nnhza