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. 1976 Oct;73(10):3594–3598. doi: 10.1073/pnas.73.10.3594

Isolation of retina-specific cell-aggregating factor from membranes of embryonic neural retina tissue.

R E Hausman, A A Moscona
PMCID: PMC431164  PMID: 1068472

Abstract

There is increasing evidence that developmental associations among embryonic cells are mediated by specific components of the cell surface. Earlier work has indicated that such components are extruded into the medium of primary monolayer cultures of embryonic cells, and that they represent the active constituents of the tissue-spedific cell-aggregating factors isolated fro- the supernatant medium of such cultures. We presently report that tissue-specific cell-aggregating factors can be obtained directly from embryonic tissues, and describe the isolation and partial purification of retina-spedific factor from a cell-membrane preparation derived from retina tissue of the chick embryo. Extraction of the purified membrane preparation with 1-butanol yielded an activity in the aqueous phase which resides in a protein probably a glycoprotein, with an estimated molecular weight of 50,000 in solution. This material could be obtained from retinas of embryos not older than 13 days, and only pre-13-day cells responded to its cell-aggregating activity. By these characteristics, this membrane-derived retina factor closely resembles the retina cell-aggregating glycoprotein previously purified from the supernatant medium of retina cell cultures. It is of special interest that the cell-aggregating protein is obtainable from cellular membranes during those stages of development when retina cells are most actively engaged in histological organization. Work in progress indicates that, by the procedures described herein, tissue-specific cell-aggregating factors can also be obtained from membrane preparations of other embryonic tissues.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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