Programmed cell death in the developing nervous system

Brain Pathology
M J Burek, R W Oppenheim

Abstract

Virtually all cell populations in the vertebrate nervous system undergo massive "naturally-occurring" or "programmed" cell death (PCD) early in development. Initially neurons and glia are overproduced followed by the demise of approximately one-half of the original cell population. In this review we highlight current hypotheses regarding how large-scale PCD contributes to the construction of the developing nervous system. More germane to the theme of this symposium, we emphasize that the survival of cells during PCD depends critically on their ability to access "trophic" molecular signals derived primarily from interactions with other cells. Here we review the cell-cell interactions and molecular mechanisms that control neuronal and glial cell survival during PCD, and how the inability of such signals to suppress PCD may contribute to cell death in some diseases such as spinal muscular atrophy. Finally, by using neurotrophic factors (e.g. CNTF, GDNF) and genes that control the cell death cascade (e.g. Bcl-2) as examples, we underscore the importance of studying the mechanisms that control neuronal and glial cell survival during normal development as a means of identifying molecules that prevent pathology-induced cell death. Ult...Continue Reading

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