Asymmetric accumulation of hippocampal 7S SNARE complexes occurs regardless of kindling paradigm.
Modifications of neurotransmission may contribute to the synchronization of neuronal networks that are a hallmark of epileptic seizures. In this study we examine the synaptosomal proteins involved in neurotransmitter release to determine if alterations in their interactions correlate with the chronic epileptic state. Using quantitative western blotting, we measured the levels of 7S SNARE complexes and SNARE effectors in the effected hippocampi from animals that were electrically kindled through stimulation from one of three different foci. All three kindling paradigms, amygdalar, entorhinal, and septal, were associated with an accumulation of 7S SNARE complexes in the ipsilateral hippocampus, measured 1 month after completion of kindling. Of the eight SNARE effectors examined (alpha-SNAP, NSF, SV2A/B, Munc18a/nSec1, Munc13-1, Complexins 1 and 2, and synaptotagmin I), there was a statistically significant bihemispheric increase of hippocampal SV2 and decrease of NSF upon kindling; neither by itself would be expected to account for the asymmetry of SNARE complex distribution. These data suggest that an ipsilateral hippocampal accumulation of SNARE complexes is a permanent alteration of kindling-induced epilepsy, regardless of stimulation pathway. The significance of these findings toward a molecular understanding of epilepsy will be discussed.
Matveeva
Elena A
EA
Department of Molecular and Cellular Biochemistry, University of Kentucky Medical Center, Lexington, KY 40536-0509, United States.
Vanaman
Thomas C
TC
Whiteheart
Sidney W
SW
Slevin
John T
JT
D000679:Amygdala / Q000378:metabolism; D000818:Animals; D004558:Electric Stimulation; D004567:Electrodes, Implanted; D018728:Entorhinal Cortex / Q000378:metabolism; D006624:Hippocampus / Q000378:metabolism*; D007696:Kindling, Neurologic; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D050600:SNARE Proteins / Q000378:metabolism*; D012640:Seizures / Q000378:metabolism*; D020665:Septum of Brain / Q000378:metabolism; D052067:Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins / Q000378:metabolism; D013574:Synaptosomes / Q000378:metabolism*
D050600:SNARE Proteins; D052067:Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins