There's Life After Radiation for Brain Cells. Johns Hopkins researchers suggest neural stem cells may regenerate after anti-cancer treatment. Release Date: August 12, 2013. Scientists have long believed that healthy brain cells, once damaged by radiation designed to kill brain tumors, cannot regenerate.
The key player in acid secretion is a H+/K+ ATPase or proton pump located in the cannalicular membrane. 1  This ATPase is magnesium-dependent, and not inhibitable by ouabain. The current model for explaining acid secretion is as follows: 2  Hydrogen ions are generated within the parietal cell from dissociation of water.
So far, we have hydrogen ions moving downhill through transporters and releasing energy. We also have these ions moving uphill, into areas of higher concentration, using a proton pump. Pumping against a gradient can be difficult, so the job of proton pumps is hard work. There is one pump that isn't as strong, and so acts a little out of the ordinary. It is called the Proton Pyrophosphatase Pump.