Semaphorin-4D (SEMA4D) also known asCluster ofDifferentiation100 (CD100), is aprotein of thesemaphorin family that in humans is encoded by theSEMA4Dgene.[5]
Semaphorin 4D (Sema 4D) is anaxon guidance molecule which is secreted byoligodendrocytes and inducesgrowth cone collapse in thecentral nervous system. By bindingplexin B1 receptor it functions as an R-Ras GTPase-activating protein (GAP) and repels axon growth cones in both the mature central nervous system.[6]
In the immune system, CD100 bindsCD72 to activateB cells anddendritic cells, though much about this interaction is still under investigation.[7][8]
Duringskin damage repairs, SEMA4D interacts withPlexin B2 onGamma delta T cells to play a role in the healing process.[9]
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