Calcium and increase excitability promote tolerance against anoxia in hippocampal slices

Abstract

We have previously demonstrated that anoxic preconditioning (APC) protects against a subsequent otherwise `lethal' anoxic insult in hippocampal slices. Tested here are two hypotheses: (a) APC requires calcium to improve electrical recovery in hippocampal slices; and (b) mild excitation promotes preconditioning neuroprotection. Control hippocampal slices were given a single `test' anoxic insult followed by reoxygenation. Experimental slices were preconditioned by three short anoxic insults of 1 min separated by 10 min of reoxygenation. At 30 min after the third `conditioning' insult, slices underwent a `test' anoxic insult [1 min of anoxic depolarization (AD)], and then slices were reoxygenated. Evoked potentials (EPs) were recorded throughout the experiment. In other slices, APC was emulated by inducing spreading depression (as determined by a negative DC shift) with KCL or by inducing increased neuronal excitability with the excitatory agent 8-cyclopentyl-1,3-dipropylxanthine (DPCPX) (an adenosine A1 receptor blocker). `Test' anoxic insults lasted 2 min of AD in these groups. To determine the role of calcium during APC, extracellular CaCl 2 was decreased to 0.5 mM but only during the APC episodes (`test' anoxia, 1 min of AD). EP amplitudes recovered significantly better after anoxia in preconditioned slices, and in KCl- and DPCPX-treated slices (147.2±33.3, n=8, ** p<0.01, 71.7±13.5, n=7, ** p<0.01, and 117.8±37.3, n=5, *** p<0.001, respectively) compared to controls. Decreases in extracellular CaCl 2 during APC blocked the recovery of EPs after `test' anoxia (80.6±23.0, n=8). These data confirm that increases in excitability can emulate APC. These data also demonstrate that calcium influx during preconditioning is required for the induction of tolerance during APC.