Presynaptic excitability changes following traumatic brain injury in the rat.

Abstract:

:Pathological processes affecting presynaptic terminals may contribute to morbidity following traumatic brain injury (TBI). Posttraumatic widespread neuronal depolarization and elevated extracellular potassium and glutamate are predicted to alter the transduction of action potentials in terminals into reliable synaptic transmission and postsynaptic excitation. Evoked responses to orthodromic single- and paired-pulse stimulation were examined in the CA1 dendritic region of hippocampal slices removed from adult rats following fluid percussion TBI. The mean duration of the extracellularly recorded presynaptic volley (PV) increased from 1.08 msec in controls to 1.54 msec in slices prepared at 1 hr postinjury. There was a time-dependent recovery of this injury effect, and PV durations at 2 and 7 days postinjury were not different from controls. In slices removed at 1 hr postinjury, the initial slopes of field excitatory postsynaptic potentials (fEPSPs) were reduced to 36% of control values, and input/output plots revealed posttraumatic deficits in the transfer of excitation from pre- to postsynaptic elements. Manipulating potassium currents with 1.0 mM tetraethylammonium or elevating potassium ion concentration to 7.5 mM altered evoked responses but did not replicate the injury effects to PV duration. Paired-pulse facilitation of fEPSP slopes was significantly elevated at all postinjury survivals: 1 hr, 2 days, and 7 days. These results suggest two pathological processes with differing time courses: 1) a transient impairment of presynaptic terminal functioning affecting PV durations and the transduction of afferent activity in the terminals to reliable synaptic excitation and 2) a more protracted deficit to the plasticity mechanisms underlying paired-pulse facilitation.

journal_name

J Neurosci Res

authors

Reeves TM,Kao CQ,Phillips LL,Bullock MR,Povlishock JT

doi

10.1002/(SICI)1097-4547(20000501)60:3<370::AID-JNR

keywords:

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

370-9

issue

3

eissn

0360-4012

issn

1097-4547

pii

10.1002/(SICI)1097-4547(20000501)60:3<370::AID-JNR

journal_volume

60

pub_type

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