Abstract
Class 3 semaphorins are expressed in the neurodevelopmental or damage repair phase of the central nervous system (CNS). They play an important role in guiding axon growth and directing cell migration, including the migration of oligodendrocyte precursor cells (OPCs). As co-receptors for semaphorin 3F(sema3F), the expression and role of neuropilin-2 (NRP2) and plexin A3 in OPC migration are unclear. Using RT-PCR, Western blot analysis, and immunofluorescence, we demonstrated that primary OPCs and immature oligodendrocytes from neonatal rats express NRP2 and plexin A3. After transfection with NRP2 siRNA and plexin A3 siRNA, the number of migrating OPCs attracted to sema3F remarkably decreased. These results suggest that plexin A3 is expressed in OPCs and immature oligodendrocytes and is involved in OPC migration.
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