Tenascin M r 220000 isoform expression correlates with corneal cell migration
Open Access
- 1 June 1991
- journal article
- Published by The Company of Biologists in Development
- Vol. 112 (2), 605-614
- https://doi.org/10.1242/dev.112.2.605
Abstract
The three isoforms of chicken tenascin, an extracellular matrix glycoprotein, are generated by alternatively spliced fibronectin type III domains. The resulting proteins migrate as bands of MT 220000 (ten220), Mr 200000 (ten200) and Mr 190000 (tenl90) on SDS-PAGE. We describe here two monoclonal antibodies, one specific for ten220 (mAb T17) and another that recognizes all isoforms (mAb T16). These were used to examine the differential expression of isoforms during development. Most impressive is the close correlation between ten220 expression and cell migration in the embryonic cornea. Initially (stage 18), tenl90/200 can be detected within the corneal epithelium and along the basement membranes of the lens and sclera. Ten220 appears within the primary stroma immediately prior to the invasion by neural-crest-derived cells. This expression is maintained during the subsequent migration of fibro blasts from the conjunctiva into the primary stroma. With the completion of migration and the marked increase in matrix synthesis by corneal fibroblasts, ten220 disappears. Tenl90/200 remains in the region adjoining the endothelium, the Bowman’s membrane and the adjacent stroma. The cell-migration-associated isoform is isolated from extracts of embryonic tissues as a homohexamer. Low molecular weight forms appeared absent but a new tenascin band of Mr 210 000 could be detected in brain extracts which may be a new isoform. We conclude that the synthesis of tenascin isoforms is under tight developmental control and speculate that a function of the additional domains is to facilitate cell migration.Keywords
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