Connexin43, the major gap junction protein of astrocytes, is down-regulated in inflamed white matter in an animal model of multiple sclerosis

Elimor Brand-Schieber, Peter Werner, Dumitru A. Iacobas, Sanda Iacobas, Michelle Beelitz, Stuart L. Lowery, David C. Spray, Eliana Scemes

Research output: Contribution to journalArticlepeer-review

104 Scopus citations


Both multiple sclerosis (MS) and experimental autoimmune encephalomyelitis (EAE), its animal model, involve inflammatory attack on central nervous system (CNS) white matter, leading to demyelination and axonal damage. Changes in astrocytic morphology and function are also prominent features of MS and EAE. Resting astrocytes form a network that is interconnected through gap junctions, composed mainly of connexin43 (Cx43) protein. Although astrocytic gap junctional connectivity is known to be altered in many CNS pathologies, little is known about Cx43 expression in inflammatory demyelinating disease. Therefore, we evaluated the expression of Cx43 in spinal cords of EAE mice compared with healthy controls. Lumbar ventral white matter areas were heavily infiltrated with CD11β-immunoreactive monocytes, and within these infiltrated regions loss of Cx43 immunoreactivity was evident. These regions also showed axonal dystrophy, demonstrated by the abnormally dephosphorylated heavy-chain neurofilament proteins. Astrocytes in these Cx43-depleted lesions were strongly glial fibrillary acidic protein reactive. Significant loss (38%) of Cx43 protein in EAE mouse at the lumbar portion of spinal cords was confirmed by Western blot analysis. Decreased Cx43 transcript level was also observed on cDNA microarray analysis. In addition to changes in Cx43 expression, numerous other genes were altered, including those encoding adhesion and extracellular matrix proteins. Our data support the notion that, in addition to damage of myelinating glia, altered astrocyte connectivity is a prominent feature of inflammatory demyelination.

Original languageEnglish (US)
Pages (from-to)798-808
Number of pages11
JournalJournal of Neuroscience Research
Issue number6
StatePublished - Jun 15 2005


  • Cx43
  • Experimental autoimmune encephalomyelitis
  • Immunohistochemistry
  • Inflammation
  • Microarray
  • White matter

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience


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