Article: Persistent barrage firing in cortical interneurons can be induced in vivo and may be important for the suppression of epileptiform activity.

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Suzuki N; Tang CS; Bekkers JM
Front Cell Neurosci, 2014

Table 1

Summary of parameters associated with barrage firing in different neuron types, brain regions and recording conditions.

	% Cells with BF	% BF cells with spikelets	Number of APs before BF starts	AP freq during induction (Hz)	Max BF frequency (Hz)	BF duration (s)	AP threshold (mV)		AP rise time (ms)
							Induct	BF	Induct	BF
Piriform NG cells in vitro	85% (60)	69% (51)	437 ± 27 (50)	49.7 ± 2.9 (47)	104.0 ± 12.3 (46)	35.6 ± 4.7 (49)	-41.0 ± 1.0 (47)	-77.0 ± 0.9 (47)	0.39 ± 0.01 (47)	1.00 ± 0.04 (47)
Piriform FS cells in vitro	23% (22)	20% (5)	1136 ± 188 (5)	128.7 ± 29.9 (5)	119.5 ± 10.7 (4)	9.8 ± 2.3 (5)	-48.0 ± 1.4 (5)	-75.5 ± 2.2 (5)	0.26 ± 0.01 (5)	0.46 ± 0.05 (5)
CA1 NG cells in vitro	83% (6)	20% (5)	370 ± 71 (5)	41.4 ± 3.7 (4)	62.6 ± 14.3 (5)	47.6 ± 26.3 (5)	-48.9 ± 2.2 (4)	-76.4 ± 2.0 (4)	0.37 ± 0.02 (4)	0.56 ± 0.04 (4)
Neocortical NG cells in vitro	83% (6)	60% (5)	391 ± 70 (5)	30.7 ± 2.4 (5)	69.7 ± 12.7 (4)	29.7 ± 16.0 (4)	-41.9 ± 4.4 (4)	-76.2 ± 5.0 (4)	0.35 ± 0.01 (4)	0.72 ± 0.09 (4)
Neocortical NG cells in vivo, 1 s and 2 ms step induct	61% (33)	45% (20)	851 ± 96 (20)	27.0 ± 2.3 (20)	99.5 ± 19.1 (18)	35.7 ± 10.9 (20)	-32.1 ± 2.7 (14)	-66.4 ± 2.2 (14)	0.63 ± 0.05 (14)	1.14 ± 0.11 (14)
Piriform NG cells in vitro, EPSP induct	80% (5)	0% (4)	272 ± 97 (4)	19.1 ± 0.5 (4)	95.0 ± 12.8 (4)	33.2 ± 22.3 (4)	-47.2 ± 3.4 (4)	-72.9 ± 1.7 (4)	0.39 ± 0.02 (4)	0.71 ± 0.04 (4)
Piriform NG cells in vitro, K⁺ induct	63% (8)	0% (5)	–	–	119.0 ± 13.2 (5)	–	-49.0 ± 2.1 (3)	-57.8 ± 0.8 (3)	0.41 ± 0.05 (3)	0.55 ± 0.05 (3)

All in vitro data shown here were obtained from slices prepared from 18 to 25 d-old mice, whereas in vivo data were from 30 to 45 d-old mice. Format of entries is: mean ± SE (number of cells). “Max BF freq (Hz)” was calculated by combining spikelets and composite (full-amplitude) barrage-firing APs. “AP rise time (ms)” was measured only for composite barrage-firing APs. In the right-most four columns, “Induct” indicates parameters averaged for five APs near the start of induction, “BF” indicates parameters averaged for the first five APs after start of barrage firing. Unless otherwise stated, induction used 1 s-long current steps at 0.5 Hz. See Results for illustrative statistical comparisons.

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Inferred neuron-electrophysiology data values

Neuron Type	Neuron Description	Ephys Prop	Extracted Value	Standardized Value	Content Source
Olfactory cortex pyramidal cell	Anterior Piriform Cortex Neurogliaform cells	spike rise time	0.39 ± 0.01 (47)	0.39 (ms)	Data Table
Olfactory cortex pyramidal cell	anterior piriform cortex layer 3 fast-spiking cells	firing frequency (Hz)	128.7 ± 29.9 (5)	128.7 (Hz)	Data Table
Olfactory cortex pyramidal cell	anterior piriform cortex layer 3 fast-spiking cells	spike threshold	-48.0 ± 1.4 (5)	-48.0 (mV)	Data Table
Olfactory cortex pyramidal cell	anterior piriform cortex layer 3 fast-spiking cells	spike rise time	0.26 ± 0.01 (5)	0.26 (ms)	Data Table
Hippocampus CA1 neurogliaform cell		firing frequency (Hz)	41.4 ± 3.7 (4)	41.4 (Hz)	Data Table
Hippocampus CA1 neurogliaform cell		spike threshold	-48.9 ± 2.2 (4)	-48.9 (mV)	Data Table
Hippocampus CA1 neurogliaform cell		spike rise time	0.37 ± 0.02 (4)	0.37 (ms)	Data Table
Neocortex interneuron deep	Neocortex Neurogliaform cells	firing frequency (Hz)	30.7 ± 2.4 (5)	30.7 (Hz)	Data Table
Neocortex interneuron deep	Neocortex Neurogliaform cells	spike threshold	-41.9 ± 4.4 (4)	-41.9 (mV)	Data Table
Neocortex interneuron deep	Neocortex Neurogliaform cells	spike rise time	0.35 ± 0.01 (4)	0.35 (ms)	Data Table
Olfactory cortex pyramidal cell	Anterior Piriform Cortex Neurogliaform cells	firing frequency (Hz)	49.7 ± 2.9 (47)	49.7 (Hz)	Data Table
Olfactory cortex pyramidal cell	Anterior Piriform Cortex Neurogliaform cells	spike threshold	-41.0 ± 1.0 (47)	-41.0 (mV)	Data Table