Heterogeneous distribution of ecto-Ca-ATPases in primary cultures of human adenohypophyseal cells.
The aim of this study was to investigate the localization of ecto-Ca-adenosine-triphosphatase (ecto-Ca-ATPase) in different parenchymal cells of the human pituitary in tissue culture. The distribution of ecto-ATPases on the surface membrane of a particular parenchymal cell varied with the type of cells in contact with this parenchymal cell; the membrane portions immediately exposed to the medium showed low if any ecto-ATPase activity. These results suggest that ecto-Ca-ATPases of the parenchymal cells may be involved in cell adhesion processes and may be of crucial importance in the organization (in vivo) and reorganization (in vitro) of human adenohypophyseal tissue.
Kittel
A
A
Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, Hungary.
Miklós
I
I
Bácsy
E
E
D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D002448:Cell Adhesion / Q000502:physiology; D002462:Cell Membrane / Q000201:enzymology; D002478:Cells, Cultured; D006651:Histocytochemistry; D006801:Humans; D008854:Microscopy, Electron; D016253:Microscopy, Immunoelectron; D010903:Pituitary Gland, Anterior / Q000201:enzymology* / Q000648:ultrastructure
D000251:Adenosine Triphosphatases; C027201:ectoATPase; D000252:Calcium-Transporting ATPases