Activation of NF-κB and c-jun transcription factors in multiple sclerosis lesions

Implications for oligodendrocyte pathology

Bruno Bonetti, Chiara Stegagno, Barbara Cannella, Nicola Rizzuto, Giuseppe Moretto, Cedric S. Raine

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

Oligodendrocytes are a major target of the purported autoimmune response in multiple sclerosis (MS) lesions, but little is known about the mechanisms underlying their demise. Despite the expression of proapoptotic receptors, these cells are rarely seen to undergo apoptosis in situ. On the other hand, cytotoxic mediators present in MS lesions, such as tumor necrosis factor-α, are known to generate survival signals through the activation of the transcription factors NF-κB and c-jun. The aim of this study was to investigate in chronic active and silent MS lesions and control white matter the expression of c-jun, its activating molecule, JNK, as well as NF-κB complex and its inhibitor, IκB. By immunohistochemistry we found negligible reactivity for these molecules in control white matter and silent MS plaques. In active MS lesions, double-label immunohistochemistry with oligodendrocyte markers showed up-regulation of the nuclear staining for both NF-κB and JNK on a large proportion of oligodendrocytes located at the edge of active lesions and on microglia/macrophages throughout plaques. Oligodendrocytes showed no reactivity for IκB, which was predominantly confined to the cytoplasm of microglia/macrophages. We hypothesize that activation of these transcriptional pathways may be one mechanism accounting for the paucity of oligodendrocyte apoptosis reported in MS.

Original languageEnglish (US)
Pages (from-to)1433-1438
Number of pages6
JournalAmerican Journal of Pathology
Volume155
Issue number5
StatePublished - Nov 1999

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Oligodendroglia
Multiple Sclerosis
Transcription Factors
Pathology
Microglia
Immunohistochemistry
Macrophages
Apoptosis
Autoimmunity
Transcriptional Activation
Cytoplasm
Up-Regulation
Tumor Necrosis Factor-alpha
Staining and Labeling

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Bonetti, B., Stegagno, C., Cannella, B., Rizzuto, N., Moretto, G., & Raine, C. S. (1999). Activation of NF-κB and c-jun transcription factors in multiple sclerosis lesions: Implications for oligodendrocyte pathology. American Journal of Pathology, 155(5), 1433-1438.

Activation of NF-κB and c-jun transcription factors in multiple sclerosis lesions : Implications for oligodendrocyte pathology. / Bonetti, Bruno; Stegagno, Chiara; Cannella, Barbara; Rizzuto, Nicola; Moretto, Giuseppe; Raine, Cedric S.

In: American Journal of Pathology, Vol. 155, No. 5, 11.1999, p. 1433-1438.

Research output: Contribution to journalArticle

Bonetti, B, Stegagno, C, Cannella, B, Rizzuto, N, Moretto, G & Raine, CS 1999, 'Activation of NF-κB and c-jun transcription factors in multiple sclerosis lesions: Implications for oligodendrocyte pathology', American Journal of Pathology, vol. 155, no. 5, pp. 1433-1438.
Bonetti, Bruno ; Stegagno, Chiara ; Cannella, Barbara ; Rizzuto, Nicola ; Moretto, Giuseppe ; Raine, Cedric S. / Activation of NF-κB and c-jun transcription factors in multiple sclerosis lesions : Implications for oligodendrocyte pathology. In: American Journal of Pathology. 1999 ; Vol. 155, No. 5. pp. 1433-1438.
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