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ELECTRON PROBE ANALYSIS OF THE CALCIUM DISTRIBUTION IN CELLS OF THE EMBRYONIC CHICK CHORIOALLANTOIC MEMBRANE II. DEMONSTRATION OF INTRACELLULAR LOCATION DURING ACTIVE TRANSCELLULAR TRANSPORT

JAMES R. COLEMAN 1 and A. RAYMOND TEREPKA 1

1 Department of Radiation Biology and Biophysics, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642

Electron probe analysis of the embryonic chick chorioallantoic membrane reveals that calcium is located at discrete sites in the ectodermal cell layer of the membrane. The calcium loci are found at characteristic sites within distinctive "capillary-covering" cells. Evidence is presented that the calcium identified by electron probe analysis is that pool of calcium undergoing active transcellular transport. Mitochondria and/or endoplasmic reticulum do not appear to be responsible for the observed calcium sequestration. It is suggested that the calcium might be contained within endocytotic vesicles, and a hypothesis is advanced which could reconcile endocytotic transcellular transport by specialized cells with previously proposed models for intracellular calcium ion regulation.

Submitted on November 26, 1971


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 J. Cell Sci.Home page
R. Akins and R. Tuan
Transepithelial calcium transport in the chick chorioallantoic membrane. II. Compartmentalization of calcium during uptake
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[Abstract] [PDF]



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