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Development, Vol 122, Issue 1 1-9, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
S Roffler-Tarlov, JJ Brown, E Tarlov, J Stolarov, DL Chapman, M Alexiou and VE Papaioannou
Department of Neuroscience, Tufts University School of Medicine, Boston, MA 02111, USA.
Programmed cell death, or apoptosis, is a normal process in the development of a variety of embryonic and adult tissues, and is also observed in several pathological conditions. Several recent studies, using both expression and functional assays, have implicated the transcription factor, AP-1, in the regulation of programmed cell death, and specifically implicate the genes c-fos and c-jun, as well as some other family members. If the products of the c-fos and/or c-jun genes are essential components in the cascade of events that leads to programmed cell death in mammalian cells, it follows that cell death would not occur in mice lacking functional copies of these genes. We have made use of null mutations in the c-fos and c-jun genes that were produced by gene targeting (Johnson, R.S., Spiegelman, B.M. and Papaioannou, V.E. (1992). Cell 71, 577-586; Johnson, R.S., Van Lingen, B., Papaioannou, V.E. and Spiegelman, B.M. (1993). Genes Dev. 7, 1309-1317) to investigate this possibility. Cell death was assayed using an in situ apoptosis assay in c-fos null embryos and adults, c-jun null embryos, and c-fos/c-jun double null embryos compared with control mice. The occurrence of cell death in c-fos null mice was also assessed in two experimental conditions that normally lead to neuronal cell death. The first was unilateral section of the sciatic nerve in neonates, which leads to the death of anterior horn cells of the spinal cord on the operated side. The second was a genetic cross combining the weaver mutation, which causes death of cerebellar granule cells, with the c-fos mutation. Our results show that programmed cell death occurs normally in developing embryonic tissues and adult thymus and ovary, regardless of the absence of a functional c-fos gene. Furthermore, absence of c-fos had no effect on neuronal cell death in the spinal cord following sciatic nerve section, or in heterozygous weavers' cerebellae. Finally, the results show that programmed cell death can take place in embryos lacking both Fos and Jun.
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