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To identify genes that exhibit changed expression levels in dying motoneurons, we used a PCR-based subtractive hybridization protocol to identify messages uniquely expressed in motoneurons deprived of trophic support as compared with their healthy counterparts. We report that one upregulated message in developing motoneurons undergoing cell death is the mRNA for amyloid precursor protein (APP). Increased levels of APP and \u03b2-amyloid protein are also detected within dying motoneurons. The predicted peptide sequence of APP indicates two potential cleavage sites for caspase-3 (CPP-32), a caspase activated in dying motoneurons. When peptide inhibitors of caspase-3 are administered to motoneurons destined to undergo PCD, decreased levels of APP protein and greatly reduced \u03b2-amyloid production are observed. Furthermore, we show that APP is cleaved by caspase-3. Our results suggest that differential gene expression results in increased levels of APP, providing a potential substrate for one of the cell death-activated caspases that may ultimately cause the demise of the cell. These results, combined with information on the toxic role of APP and its proteolytic by-product \u03b2-amyloid, in the neurodegenerative disease Alzheimer\u2019s, suggest that events of developmental PCD may be reactivated in early stages of pathological neurodegeneration.<\/jats:p>","DOI":"10.1523\/jneurosci.18-15-05869.1998","type":"journal-article","created":{"date-parts":[[2018,4,3]],"date-time":"2018-04-03T18:08:51Z","timestamp":1522778931000},"page":"5869-5880","source":"Crossref","is-referenced-by-count":105,"title":["Increased Production of Amyloid Precursor Protein Provides a Substrate for Caspase-3 in Dying Motoneurons"],"prefix":"10.1523","volume":"18","author":[{"given":"Natalie Y.","family":"Barnes","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ling","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuaki","family":"Yoshikawa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lawrence M.","family":"Schwartz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ronald W.","family":"Oppenheim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carolanne E.","family":"Milligan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"393","published-online":{"date-parts":[[1998,8,1]]},"reference":[{"key":"2023041302392027000_18.15.5869.1","doi-asserted-by":"crossref","first-page":"1487","DOI":"10.1046\/j.1471-4159.1995.65041487.x","article-title":"Differential induction of immediate early gene proteins in cultured neurons by \u03b2-amyloid (A\u03b2): association of c-Jun with A\u03b2-induced apoptosis.","volume":"65","author":"Anderson","year":"1995","journal-title":"J Neurochem"},{"key":"2023041302392027000_18.15.5869.2","doi-asserted-by":"publisher","DOI":"10.1016\/S0166-2236(97)01144-2"},{"key":"2023041302392027000_18.15.5869.3","unstructured":"Ausubel FM Brent R Kingston RE Moore DD Seidman JG Smith JA Struhl K (1996) Current protocols in molecular biology, p 10.1.4. 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