Control, modulation, and regulation of cell calcium

Red Light Stimulates an Increase in Intracellular Calcium in the Spores of Onoclea sensibilis

“…We assume that, in agreement with Ca distributions in cells of other plants (14), the EGTA-accessible Ca is external to the plasmalemma and that the remaining is intracellular. Furthermore, the amount ofCa remaining after the EGTA/ H20 wash is approximately the same as is found in animal cells stripped of their glycocalyx (2 total Mg content is accessible to an EGTA/H20 wash (Table I). R stimulates an increase in total intracellular Ca (Table II).…”

Evidence that adrenaline activates key oxidative enzymes in rat liver by increasing intramitochondrial [Ca2+]

“…The present study should avoid contamination problems because exclusively intramitochondrial parameters have been measured, although there remains the possibility that hormones may alter relationships between free and total Ca pools in the mitochondria. Finally, the present results further support the concept that under normal physiological conditions the Ca'+-transport systems of the mitochondrial inner membrane exist primarily to relay changes in cytoplasmic [Ca*+] to the mitochondrial matrix [12,13] rather than, conversely, to 'buffer' or 'set' cytoplasmic [Ca2+] [25,41].…”

Calcium: its modulation in liver by cross-talk between the actions of glucagon and calcium-mobilizing agonists

“…Lehninger et al, 1967;Bygrave, 1978a;Williamson et al, 1981;Akerman and Nicholls, 1983). Initially, little attention was paid to the possible role of hormones in the control of these intracellular events, but towards the end of that decade a realization emerged that certain hormones and also cyclic AMP might play a role in the control of intracellular Ca2+ (Bygrave, 1978a;Rasmussen, 1981;Borle, 1981 ;Exton, 1981). Others were advocating a possible controlling role of cyclic AMP in Ca2+ fluxes across the cell (plasma) membrane (Friedmann and Park, 1968;Borle, 1972) and that Ca2+ and cyclic AMP could have an interactive role in the control of cell metabolism (Rasmussen and Barrett, 1984).…”