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TRPM-2 Expression and Tunel Staining in Neurodegenerative Diseases: Studies in Wobbler andrdMice

Authors
Journal
Experimental Neurology
0014-4886
Publisher
Elsevier
Publication Date
Volume
143
Issue
2
Identifiers
DOI: 10.1006/exnr.1996.6364
Disciplines
  • Biology
  • Medicine

Abstract

Abstract Neuronal apoptosis has been described during development but little is known about whether apoptosis plays a role in neurodegenerative disease. Neurodegenerative cell death can be difficult to study because it is often a slow process and it is limited to only a few cells among many nondying cells. We used molecular methods to study cell death in the spinal cords of wobbler mice, a model of motoneuron disease, and compared it to retinas of rdmice, a model of retinitis pigmentosa, where it is known that photoreceptors die by apoptosis. Increased levels of mRNA of testosterone-repressed prostate message 2 (TRPM-2) were found in motoneurons of wobbler mice and the retinas of rdmice. In motoneurons, TRPM-2 mRNA colocalized with increased expression of the message for growth-associated protein (GAP-43). In rdretinas, TRPM-2 mRNA was localized to ganglion cells of the inner retina known to survive the disease. These suggest that TRPM-2 expression is associated with cell membrane remodeling in surviving cells associated with synaptic reorganization or change in afferent input. In situlabeling of fragmented DNA (TUNEL staining) identified dying photoreceptors in the rdmouse. In the wobbler spinal cords dying motoneurons were not labeled. These data suggest that the process of neurodegenerative motoneuron cell death in wobbler mice is different from the apoptotic process of rdphotoreceptors.

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