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Ischemic brain damage in mice after selectively modifying BDNF or NT4 gene expression.
1Stroke and Neurovascular Regulation Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston 02129, USA.
Summary
Reduced levels of neurotrophin-4 (NT4) and brain-derived neurotrophic factor (BDNF) increase susceptibility to cerebral ischemia. This suggests that NT4 and BDNF, via the TrkB receptor, offer neuroprotection against ischemic injury.
Area of Science:
- Neuroscience
- Neurobiology
- Cerebrovascular Research
Background:
- Neurotrophins, including NT4 and BDNF, and their receptor TrkB are implicated in neuroprotection.
- Cerebral ischemia can lead to significant brain damage, and understanding protective mechanisms is crucial.
Purpose of the Study:
- To investigate if reduced endogenous expression of TrkB-binding neurotrophins affects susceptibility to ischemic brain injury.
- To determine the role of NT4 and BDNF in protecting against cerebral ischemia.
Main Methods:
- Utilized a filament middle cerebral artery occlusion (MCAO) model in mice.
- Compared cerebral infarct sizes in wild-type mice with those lacking NT4 (nt4-/-) or deficient in BDNF (bdnf+/-) after MCAO and reperfusion.
Main Results:
- Mice lacking NT4 (nt4-/-) or deficient in BDNF (bdnf+/-) exhibited significantly larger cerebral infarcts compared to wild-type controls.
- nt4-/- mice showed increased lesion size following permanent MCAO, indicating a protective role for NT4.
Conclusions:
- Endogenous expression of both NT4 and BDNF confers resistance to ischemic injury.
- The TrkB receptor pathway, influenced by NT4 and BDNF, plays a critical role in neuroprotection against cerebral ischemia.