Cytotactin and its proteoglycan ligand mark structural and functional boundaries in somatosensory cortex of the early postnatal mouse.

Developmental Biology
K L CrossinG M Edelman

Abstract

The expression of the extracellular matrix molecules cytotactin, which is synthesized by glia, and cytotactin-binding (CTB) proteoglycan, which is synthesized by neurons, was examined in the developing brain of the mouse, specifically in the cortical barrel field, using highly specific polyclonal antibodies to the purified molecules. Both molecules appeared early in the development of the cortex but were excluded from the centers of the developing barrels at the time of entry and arborization of thalamocortical axons. Of the two major forms of cytotactin (220 and 200 kDa), the larger form predominated during development of the mouse brain and also predominated in mixed neuron-glia cultures but not in pure glial cultures. Both cytotactin and CTB proteoglycan were recognized by various lectins that have been shown in other studies to demarcate the barrel field: both molecules were recognized by lentil lectin and concanavalin A and CTB proteoglycan was also recognized by peanut and wheat germ agglutinins. The HNK-1 carbohydrate antigen, present on cytotactin, CTB proteoglycan, and other adhesion molecules, was also found in the barrel walls and diminished in the barrel hollows. Cytotactin and CTB proteoglycan were preferentially e...Continue Reading

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