Increase in SNAP-25 immunoreactivity in the mossy fibers following transient forebrain ischemia in the gerbil.

Abstract:

:SNAP-25 (a synaptosomal-associated protein of 25 kDa) has been shown to be involved both in synaptic vesicle exocytosis and in axonal outgrowth. In the present study, we investigated the changes in SNAP-25 immunoreactivity in the hippocampus of the Mongolian gerbil (Meriones unguiculatus) at different time points after transient forebrain ischemia insult. In parallel, immunostaining for GAP-43, a protein involved in axonal outgrowth, and for syntaxin-1 (stx1A and stx1B), another protein implicated in neurotransmitter release, was also analyzed. The animals were subjected to 2.5 or 5 min of transient forebrain ischemia through bilateral common carotid occlusion, and examined at different intervals after ischemia. SNAP-25 immunoreactivity was increased in the mossy fiber layer as early as 2 days after 5 min of ischemia. Increased SNAP-25 immunoreactivity in mossy fibers was also detected at days 4 and 7 after ischemia. On day 15, SNAP-25 staining was similar to that observed in control non-ischemic animals. In contrast, no changes in GAP-43 and syntaxin-1 immunoreactivity were observed in the mossy fiber layer following 5 min of ischemia. No modifications in SNAP-25, syntaxin-1 or GAP-43 immunoreactivity were observed following 2.5 min of ischemia, the longest period for which no neuronal damage is observed. These results provide evidence of a specific involvement of SNAP-25 in the reactive changes associated with transient forebrain ischemia.

journal_name

Acta Neuropathol

journal_title

Acta neuropathologica

authors

Martí E,Ferrer I,Ballabriga J,Blasi J

doi

10.1007/s004010050795

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

254-60

issue

3

eissn

0001-6322

issn

1432-0533

journal_volume

95

pub_type

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