Journal
CELL COMMUNICATION AND ADHESION
Volume 8, Issue 4-6, Pages 315-320Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3109/15419060109080745
Keywords
Astrocyte; connexin; connexon; FRIL; freeze fracture; glia; immunogold; leptomeninges; neuron; oligodendrocyte; pia mater
Categories
Funding
- NATIONAL CENTER FOR RESEARCH RESOURCES [S10RR015706] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF MENTAL HEALTH [R01MH059995] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS044395, R01NS038121, R21NS039040, R01NS031027, R01NS044010] Funding Source: NIH RePORTER
- NIMH NIH HHS [MH-59995, R01 MH059995] Funding Source: Medline
- NINDS NIH HHS [R01 NS044010, NS-38121, NS-31027, NS-39040, R01 NS038121, R01 NS044395] Funding Source: Medline
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We have identified cells expressing Cx26, Cx30. Cx32. Cx36 and Cx43 in gap junctions of rat central nervous system (CNS) using confocal light microscopic immunocytochemistry and freeze-fracture replica immunogold labeling (FRIL). Confocal microscopy was used to assess general distributions of connexins. whereas the 100-fold higher resolution of FRIL allowed co-localization of several different connexins within individual ultrastructurally-defined gap junction plaques in Ultrastructurally and immunologically identified cell types. In >4000 labeled gap junctions found in >370 FRIL replicas of gray matter in adult rats, Cx26, Cx30 and Cx43 were found only in astrocyte gap junctions: Cx32 was only in oligodendrocytes, and Cx36 was only in neurons. Moreover, Cx26, Cx30 and Cx43 were co-localized in most astrocyte gap junctions. Oligodendrocytes shared intercellular gap junctions only with astrocytes, and these heterologous junctions had Cx32 on the oligodendrocyte side and Cx26, Cx30 and Cx43 on the astrocyte side. In 4 and 18 day postnatal rat spinal cord. neuronal gap junctions contained Cx36, whereas Cx26 was present in leptomenigeal gap junctions. Thus, in adult rat CNS, neurons and glia express different connexins, with permissive connexin pairing combinations apparently defining separate pathways for neuronal vs. glial gap junctional communication.
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