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Astroctyes express a set of three connexins (Cx26, Cx30, and Cx43) that are contained in astrocyte-to-astrocyte (A/A) gap junctions; oligodendrocytes express a different set of three connexins (Cx29, Cx32, and Cx47) that are contained in the oligodendrocyte side of necessarily heterotypic astrocyte-to-oligodendrocyte (A/O) gap junctions, and there is little ultrastructural evidence for gap junction formation between individual oligodendrocytes. In addition, primarily Cx29 and Cx32 are contained deeper in myelin sheaths, where they form autologous gap junctions at sites of uncompacted myelin. The presence of six connexins in macroglial cell populations has revealed unprecedented complexity of potential connexin coupling partners, and with restricted deployment of gap junctional intercellular communication (GJIC) within the “pan-glial” syncytium. New implications for the organization and regulation of spatial buffering mediated by glial GJIC are derived from recent observations of the existence of separate astrocyte anatomical domains, with only narrow regions of overlap between astrocyte processes at domain borders. Thus, widespread spatial buffering in the CNS may occur not successively through a multitude of processes arising from different astrocytes, but rather in a more orderly fashion from one astrocyte domain to another via intercellular coupling that occurs only at restricted regions of overlap between astrocyte domains, augmented by autocellular coupling that occurs within each domain.

Astrocyte and Oligodendrocyte Connexins of the Glial Syncytium in Relation to Astrocyte Anatomical Domains and Spatial Buffering