The Journal of Immunology, Vol 147, Issue 5 1522-1529, Copyright © 1991 by American Association of Immunologists

ARTICLES

Cytokine cytotoxicity against oligodendrocytes. Apoptosis induced by lymphotoxin

K Selmaj, CS Raine, M Farooq, WT Norton and CF Brosnan
Department of Pathology (Neuropathology), Albert Einstein College of Medicine, Bronx, NY 10461.

The cytotoxic effect of recombinant human cytokines was tested on glial cells cultured from mature bovine brain. Lymphotoxin (LT) and TNF induced injury to oligodendrocytes in a time and dose-dependent fashion. The other cytokines tested, IFN-gamma, IL-6, and IL-2, did not affect oligodendrocytes in culture over a 72-h observation period. None of the cytokines injured astrocytes cultured from the same source. LT showed a much more potent cytotoxicity than TNF toward oligodendrocytes; cytotoxic changes were noted earlier (24 h) and at lower units of activity. Morphologic studies showed that the LT- mediated effects were associated with early retraction of cell processes, depolymerization of F-actin and subsequent nuclear degeneration. Lack of early cytoplasmic membrane injury as measured by 51Cr release and electron microscope studies demonstrating nuclear disintegration suggested an apoptotic mechanism of oligodendrocyte injury evoked by LT, which was supported by DNA integrity assay. These results demonstrate that LT possesses potent cytotoxic activity against oligodendrocytes and that the major mechanism involved in this process is DNA fragmentation.

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