Ventral Root Boundary Cap Cells of Rat Spinal Cord Contain Connexin-43

Boundary cap cells are a population of multipotent stem cells that have great potential for the use in the treatment of damaged nervous system. We studied the patterns of distribution of the gap junction protein connexin-43 (Cx43) in boundary cap cells of the ventral root of the spinal cord of rat embryos (E12-E20; n =40). It was found that Cx43 is expressed in ventral boundary cap cells at all stages of its existence during embryogenesis. At the early stages of prenatal development, the cytoplasmic distribution of Cx43 in the boundary cap cells predominates; at the later stages, Cx43-immunopositive punctate structures are identified. These puncta represent gap junction plaques between the cells. It can be assumed that during the early embryogenesis, Cx43 regulates the main histogenetic processes in boundary cap cells and only in the later stages of prenatal development, Cx43-mediated communications are formed between boundary cap cells.