Cell Type-Specific Expression of Neuropilins in an MCA-Occlusion Model in Mice Suggests a Potential Role in Post-Ischemic Brain Remodeling
Copyright policy )Cell Type-Specific Expression of Neuropilins in an MCA-Occlusion Model in Mice Suggests a Potential Role in Post-Ischemic Brain Remodeling
Neuropilin-1 and -2 (NP-1/NP-2) are transmembrane receptors that play a role in axonal guidance by binding of class III semaphorins, and in angiogenesis by binding of the vascular endothelial growth factor isoform VEGF165 and placenta growth factor (PLGF). We investigated the expression pattern of NP-1/NP-2, their co-receptors, vascular endothelial growth factor receptor-1 and -2 (VEGFR-1, VEGFR-2), and their ligands, class III semaphorins, VEGF and PLGF, following experimental cerebral ischemia in mice. By means of in situ hybridization and immunohistochemistry we observed loss of expression of class III semaphorins in neurons in the infarct/peri-infarct area. In contrast, we observed high expression of NP-1 in vessels, neurons, and astrocytes surrounding the infarct. VEGF and PLGF were upregulated in different cell types following stroke. Our results suggest a shift in the balance between semaphorins and VEGF/PLGF, which compete for NP-binding. Possibly, the loss of semaphorins facilitates binding of the competing ligands (VEGF/PLGF), thus inducing angiogenesis. In addition, the observed expression patterns further suggest a neurotrophic/neuroprotective role of VEGF/PLGF.
- Max Planck Society Germany
- KU Leuven Belgium
- Goethe University Frankfurt Germany
- Nagoya University Japan
- Max Planck Institute for Brain Research Germany
Cerebral Cortex, Male, Lymphokines, Mice, Inbred BALB C, Models, Neurological, Brain, Membrane Proteins, Infarction, Middle Cerebral Artery, Nerve Tissue Proteins, Cerebral Infarction, Endothelial Growth Factors, Immunohistochemistry, Brain Ischemia, Disease Models, Animal, Mice, Astrocytes, Animals, Female, Carrier Proteins, In Situ Hybridization
Cerebral Cortex, Male, Lymphokines, Mice, Inbred BALB C, Models, Neurological, Brain, Membrane Proteins, Infarction, Middle Cerebral Artery, Nerve Tissue Proteins, Cerebral Infarction, Endothelial Growth Factors, Immunohistochemistry, Brain Ischemia, Disease Models, Animal, Mice, Astrocytes, Animals, Female, Carrier Proteins, In Situ Hybridization
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