Table 1.
Characteristics of amperometric spikes and PSFs in transfected chromaffin cells
Parameters analyzedControl (NT)A2 WTA2 K286AWAA2 WT + WAA2 K286A +WA
Number of cells 56 25 32 39 25 25 
Number of spikes (total) 1,322 551 358 1,136 702 304 
Number of spikes per cell 23 ± 1 22 ± 2 11 ± 1 29 ± 3 28 ± 3 12 ± 1 
Number of spikes (analyzed) 1,021 499 275 933 638 217 
Imax (pA) 61.1 ± 2.9 61.2 ± 2.4 50.4 ± 1.9 79.6 ± 2.0 73.4 ± 3.1 52.2 ± 2.3 
Half width (ms) 28.2 ± 4.2 30.1 ± 4.1 46.8 ± 2.9 21.6 ± 2.6 22.5 ± 3.3 47.8 ± 3.1 
Q (fC) 1780 ± 170 1770 ± 80 1750 ± 120 1790 ± 90 1720 ± 120 1790 ± 50 
Slope (pA/ms) 6.1 ± 0.9 5.8 ± 0.9 2.9 ± 0.8 10.9 ± 0.7 11.2 ± 1.5 3.1 ± 0.7 
Rise time (ms) 10.2 ± 1.8 11.5 ± 1.5 18.1± 1.2 7.1± 1.1 7.1± 1.1 19.1 ± 2.1 
Decay time (ms) 58.9 ± 5.9 60.9 ± 3.5 65.8 ± 2.2 35.7 ± 2.0 38.8 ± 3.2 64.1 ± 4.0 
Spike with foot (%) 29 26 32 17 16 27 
Number of feet analyzed 304 129 89 159 102 59 
Number of feet per cell 5.4 ± 0.9 5.1 ± 0.9 2.7 ± 0.8 4.0 ± 0.4 4.0 ± 0.8 2.4 ± 0.7 
I foot (pA) 4.4 ± 0.6 4.4 ± 0.8 4.5 ± 0.7 5.4 ± 0.7 4.9 ± 0.7 4.1 ± 0.5 
Q foot (fC) 20.8 ± 2.1 20.8 ± 2.3 31.3 ± 3.4 15.3 ± 4.4 14.3 ± 3.4 30.6 ± 1.9 
t foot(ms) 14.7 ± 2.1 15.7 ± 1.9 24.3 ± 2.1 9.3 ± 2.5 8.3 ± 2.1 23.5 ± 0.9 
Parameters analyzedControl (NT)A2 WTA2 K286AWAA2 WT + WAA2 K286A +WA
Number of cells 56 25 32 39 25 25 
Number of spikes (total) 1,322 551 358 1,136 702 304 
Number of spikes per cell 23 ± 1 22 ± 2 11 ± 1 29 ± 3 28 ± 3 12 ± 1 
Number of spikes (analyzed) 1,021 499 275 933 638 217 
Imax (pA) 61.1 ± 2.9 61.2 ± 2.4 50.4 ± 1.9 79.6 ± 2.0 73.4 ± 3.1 52.2 ± 2.3 
Half width (ms) 28.2 ± 4.2 30.1 ± 4.1 46.8 ± 2.9 21.6 ± 2.6 22.5 ± 3.3 47.8 ± 3.1 
Q (fC) 1780 ± 170 1770 ± 80 1750 ± 120 1790 ± 90 1720 ± 120 1790 ± 50 
Slope (pA/ms) 6.1 ± 0.9 5.8 ± 0.9 2.9 ± 0.8 10.9 ± 0.7 11.2 ± 1.5 3.1 ± 0.7 
Rise time (ms) 10.2 ± 1.8 11.5 ± 1.5 18.1± 1.2 7.1± 1.1 7.1± 1.1 19.1 ± 2.1 
Decay time (ms) 58.9 ± 5.9 60.9 ± 3.5 65.8 ± 2.2 35.7 ± 2.0 38.8 ± 3.2 64.1 ± 4.0 
Spike with foot (%) 29 26 32 17 16 27 
Number of feet analyzed 304 129 89 159 102 59 
Number of feet per cell 5.4 ± 0.9 5.1 ± 0.9 2.7 ± 0.8 4.0 ± 0.4 4.0 ± 0.8 2.4 ± 0.7 
I foot (pA) 4.4 ± 0.6 4.4 ± 0.8 4.5 ± 0.7 5.4 ± 0.7 4.9 ± 0.7 4.1 ± 0.5 
Q foot (fC) 20.8 ± 2.1 20.8 ± 2.3 31.3 ± 3.4 15.3 ± 4.4 14.3 ± 3.4 30.6 ± 1.9 
t foot(ms) 14.7 ± 2.1 15.7 ± 1.9 24.3 ± 2.1 9.3 ± 2.5 8.3 ± 2.1 23.5 ± 0.9 

The expression of AnxA2-K286A-GFP and WA treatment significantly affected various amperometric signal parameters when catecholamine release was evoked after the application of 100 mM KCl for 10 s.

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