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Thrombin Causes Neuronal Atrophy and Acute but not Chronic Cell Death.
- Source :
-
The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques [Can J Neurol Sci] 2014 Nov; Vol. 41 (6), pp. 714-20. Date of Electronic Publication: 2014 Nov 10. - Publication Year :
- 2014
-
Abstract
- Background: Brain injury after intracerebral hemorrhage (ICH) arises from numerous contributors, of which some also play essential roles. Notably, thrombin production, needed to stop bleeding, also causes acute cell death and edema. In some rodent models of ICH, peri-hematoma neurons die over weeks. Hence we evaluated whether thrombin is responsible for this chronic degeneration. Functional impairments after ICH also result from sub-lethal damage to neurons, especially the loss of dendrites. Thus, we evaluated whether thrombin infusion alone, a reductionist model of ICH, causes similar injury.<br />Methods: Adult rats had a modest intra-striatal infusion of thrombin (1 U) or saline followed by a behavioral test, to verify impairment, 7 days later. After this they were euthanized and tissue stained with Golgi-Cox solution to allow the assessment of dendritic morphology in striatal neurons. In a second experiment, rats survived 7 or 60 days after thrombin infusion in order to histologically determine lesion volume.<br />Results: Thrombin caused early cell death and considerable atrophy in surviving peri-lesion neurons, which had less than half of their usual numbers of branches. However, total tissue loss was comparable at 7 (24.1 mm3) and 60 days (25.6 mm3).<br />Conclusion: Thrombin infusion causes early cell death and neuronal atrophy in nearby surviving striatal neurons but thrombin does not cause chronic tissue loss. Thus, the chronic degeneration found after ICH in rats is not simply and solely due to acute thrombin production. Nonetheless, thrombin is an important contributor to behavioral dysfunction because it causes cell death and substantial dendritic injury.
- Subjects :
- Animals
Atrophy pathology
Cell Death drug effects
Cell Death physiology
Cell Survival drug effects
Cell Survival physiology
Cerebral Hemorrhage chemically induced
Cerebral Hemorrhage pathology
Infusions, Intraventricular
Male
Nerve Degeneration pathology
Neurons pathology
Rats
Rats, Sprague-Dawley
Atrophy chemically induced
Nerve Degeneration chemically induced
Neurons drug effects
Thrombin administration & dosage
Thrombin toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 0317-1671
- Volume :
- 41
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques
- Publication Type :
- Academic Journal
- Accession number :
- 25382279
- Full Text :
- https://doi.org/10.1017/cjn.2014.105