Ions, Cell Proliferation, and Cancer by Alton L. Boynton

By Alton L. Boynton

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Liquid ion exchanger microelectrodes are much easier to make than glass-membrane types, since one simply has to suck up the liquid into a siliconized tip instead of fusing the conductive glass to the insulating glass with a microforge. However the liquid types are much less stable and have shorter useful lifetimes, hours instead of days, perhaps because the liquids are mobile and can change in composition. Potassium electrodes seem to be about the easiest ion-selective microelectrodes to make and use; the customary organic liquid has adequate properties given that there is more K+ than any other intracellular cation.

22 ien cells were analyzed. 05. b IV. ENERGY DISPERSIVE SPECTROSCOPY STUDIES RELATED TO THE IONIC REGULATION OF CELL REPRODUCTION IN NORMAL AND TUMOR CELLS Are changes in the intracellular concentration of Na, Mg, K, as well as other elements, characteristic of tumor cells or of dividing cells in general? To answer this question, we grouped the elemental concentrations that we have determined from a variety of cell types by EDS using our earlier preparative method (40) into four categories. These categories include: (1) group I, non-tumor cell types; (2) group II, tumor cell types; (3) group III, rapidly proliferating cells; (4) group IV, slowly proliferating.

However, if different stimuli give different relations between X and the cell response, that gives a clear indication that other modulatory factors are afoot. MICROELECTRODES Each of the main intracellular inorganic cations, K+, la±, Mgt+, Ca 2+, and H+, has been hypothesized to regulate cell proliferation, and for each of them there are ion-selective electrodes which are at least nominally selective for that ion. An ion-selective microelectrode is just an ordinary microelectrode whose tip has been plugged with a barrier which is more-or-less selectively permeable to the ion of interest.

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