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Nestin expression after experimental intracerebral hemorrhage
Takehiro Nakamura1, Guohua Xi, Ya Hua
1Department of Neurosurgery, University of Michigan, 5550 Kresge I, Ann Arbor, MI 48109-0532, USA.
Brain Research
|July 30, 2003
Summary
Nestin expression increases in astrocytes and neurons after intracerebral hemorrhage (ICH). Low-dose thrombin preconditioning also upregulates nestin, suggesting a role in brain injury tolerance.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Intracerebral hemorrhage (ICH) is a severe neurological condition.
- Nestin is an intermediate filament protein expressed in neural stem cells and developing neurons.
- Understanding cellular responses to ICH is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate nestin expression patterns following ICH.
- To determine the role of blood components in nestin upregulation.
- To explore if thrombin preconditioning influences nestin expression.
Main Methods:
- Adult male Sprague-Dawley rats underwent intracaudate injections of whole blood, thrombin, or red blood cells (RBCs).
- Immunohistochemistry was used to identify nestin-expressing cells.
- Western blotting quantified nestin expression levels.
Main Results:
- Nestin immunoreactivity was observed in astrocytes near the hematoma from day 3 to 1 week post-ICH.
- Delayed nestin expression was co-localized with neuronal markers after 2 weeks.
- Nestin expression significantly increased at day 3 and 1 week, persisting for at least 1 month.
- Thrombin and lysed RBCs markedly increased nestin expression.
- Low-dose thrombin, inducing brain tolerance, also upregulated nestin.
Conclusions:
- ICH induces nestin expression in astrocytes as an early injury response.
- Delayed neuronal nestin expression may contribute to functional recovery.
- Thrombin-induced nestin expression suggests receptor-mediated pathways and a role in preconditioning.