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Quarterly Journal of Microscopical Science, Vol s3-93, 269-288, Copyright © 1952 by Company of Biologists

Interstitial Cells in the Regeneration of Cordylophora lacustris

JANET MOORE (SINGER) 1

1 Department of Zoology, University of Bristol

1. Histological examination of developing reconstitution masses of Cordylophora lacustris has shown that interstitial cells accumulate in the tips of developing outgrowths, and that in contrast to other regions these interstitial cells are situated in the endoderm.

2. These interstitial cells do not differentiate into the ectoderm and endoderm of the regenerant, but persist and increase in the adult oral cone.

3. Interstitial cells do not accumulate in regions of growth (stolon tips) or growth and differentiation (induced outgrowths) that do not contain the rudiment of an oral cone.

4. An invariable association has been established between the presence of an interstitial cell accumulation in the endoderm and hydranth-inducing power of tissue when grafted to a mass. Outgrowth tips and oral cones both have inducing power and interstitial cell accumulations; basal hydranth regions and tentacles have inducing power, and although there is no interstitial cell accumulation in these regions of the intact hydranth, it appears before a graft produces induction.

5. There is evidence that interstitial cells are particularly rich in ribonucleic acid. Whether this property is directly related to the function of induction has yet to be determined.






© The Company of Biologists Ltd 1952