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Postischaemic chang...
Postischaemic changes in protein synthesis in the rat brain : effects of hypothermia
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- Bergstedt, Kerstin (author)
- Skåne University Hospital,Lund University
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- Hu, Bing Ren (author)
- Skåne University Hospital,Lund University
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- Wieloch, Tadeusz (author)
- Lund University,Lunds universitet,Laboratory for Experimental Brain Research,Forskargrupper vid Lunds universitet,Lund University Research Groups,Skåne University Hospital
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(creator_code:org_t)
- 1993
- 1993
- English.
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In: Experimental Brain Research. - 0014-4819. ; 95:1, s. 91-99
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Abstract
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- Protein synthesis, measured as [14C]-leucine incorporation into proteins, was studied in the normothermic rat brain following 15 min of transient cerebral ischaemia and 1 h, 24 h and 48 h of recirculation, and in the hypothermic (33°C) brain following 1 h and 48 h of recirculation. Ischaemia was induced by bilateral common carotid occlusion combined with hypotension. Following normothermic ischaemia, incorporation of [14C]-leucine was depressed by 40-80% at 1 h of recirculation in all brain regions studied. At 48 h postischaemia, incorporation returned to normal or above normal levels in the inner layers of neocortex, the CA3 region, the striatum and the dentate gyrus, while in the outer layers of neocortex and in the hippocampal CA1 region the incorporation was persistently decreased by 26% and 40% respectively. At 24 and 48 h postischaemia, protein synthesis in the CA1 region and the striatum could be attributed to proliferating microglia. Intra-ischaemic hypothermia ameliorated the persistent depression of protein synthesis in the CA1 region at 48 h postischaemia, and a two-fold increase compared to the normothermic group was observed both in the CA1 region and the striatum. In the cortex, eucaryotic initiation factor 2 activity transiently decreased at 30 min postischaemia. In animals subjected to intra-ischaemic hypothermia, the eucaryotic initiation factor 2 activity was reduced by 50% of control at 30 min of recirculation compared with 77% in normothermic animals. We conclude that the postischaemic depression of protein synthesis is in part caused by a decrease in eucaryotic initiation factor 2 activity. The early postischaemic depression may reflect a reaction of the tissue to stress, while the late persistent depression, which is normalised by intra-ischaemic hypothermia, may be related to the mechanism of cell death.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Neurovetenskaper (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Neurosciences (hsv//eng)
Keyword
- Eucaryotic initiation factor 2
- Ischaemia
- Microglia
- Neuronal death
- Rat
Publication and Content Type
- art (subject category)
- ref (subject category)
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