Abstract |
We investigated the regional changes in [3H] inositol 1,4,5-triphosphate (IP3) binding in the brain following ischemia using in vitro autoradiography. Three 2-min ischemic insults at 1-hr intervals and a 6-min period of ischemia were induced in gerbils and they were killed after 1, 4, and 28 days. Normal animals had high [3H]IP3 binding in the CA1 subfield of the hippocampus and the striatum. The binding in the CA1 decreased strikingly after both 6-min ischemia and three 2-min ischemic insults. The [3H]IP3 binding also decreased in the lateral striatum after three 2-min ischemic insults but not after 6 min of ischemia. Histological observations confirmed neuronal damage to these areas of reduced binding. By contrast, we found a marked increase in [3H]IP3 binding in the ventral thalamus 28 days after three 2-min ischemic insults. Histological observations with Nissl staining revealed an accumulation of fine granular deposits there. Thus, repeated ischemic insults produced more extensive neuronal damage and changes in [3H]IP3 binding than a single equivalent period of ischemia. The increased [3H]IP3 binding in the thalamus coincidentally with an accumulation of Nissl-positive granules at the chronic stage after repeated ischemia is of considerable interest.
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Authors | H Kato, T Araki, H Hara, K Kogure |
Journal | Brain research bulletin
(Brain Res Bull)
Vol. 33
Issue 4
Pg. 465-8
( 1994)
ISSN: 0361-9230 [Print] United States |
PMID | 8124585
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Inositol 1,4,5-Trisphosphate
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Topics |
- Animals
- Autoradiography
- Brain Chemistry
(physiology)
- Brain Ischemia
(metabolism)
- Gerbillinae
- Hippocampus
(metabolism)
- Inositol 1,4,5-Trisphosphate
(metabolism)
- Male
- Neostriatum
(metabolism)
- Thalamus
(metabolism)
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