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R6\/1 mice displayed reduced STEP protein levels in the striatum and cortex, whereas its phosphorylation was increased in the striatum, cortex, and hippocampus. The early increase in striatal STEP phosphorylation levels correlated with a deregulation of the protein kinase A pathway, and decreased calcineurin activity at later stages further contributes to an enhancement of STEP phosphorylation and inactivation. Accordingly, we detected an accumulation of phosphorylated ERK2 and p38, two targets of STEP, in R6\/1 mice striatum at advanced stages of the disease. Activation of STEP participates in excitotoxic-induced cell death. Because Huntington's disease mouse models develop resistance to excitotoxicity, we analyzed whether decreased STEP activity was involved in this process. After intrastriatal quinolinic acid (QUIN) injection, we detected higher phosphorylated STEP levels in R6\/1 than in wild-type mice, suggesting that STEP inactivation could mediate neuroprotection in R6\/1 striatum. In agreement, intrastriatal injection of TAT\u2013STEP increased QUIN-induced cell death. R6\/2, Tet\/HD94, and Hdh<jats:sup>Q7\/Q111<\/jats:sup>mice striatum also displayed decreased STEP protein and increased phosphorylation levels. In Tet\/HD94 mice striatum, mutant huntingtin transgene shutdown reestablished STEP expression. In conclusion, the STEP pathway is severely downregulated in the presence of mutant huntingtin and may participate in compensatory mechanisms activated by striatal neurons that lead to resistance to excitotoxicity.<\/jats:p>","DOI":"10.1523\/jneurosci.3446-10.2011","type":"journal-article","created":{"date-parts":[[2011,6,1]],"date-time":"2011-06-01T16:54:16Z","timestamp":1306947256000},"page":"8150-8162","source":"Crossref","is-referenced-by-count":64,"title":["Striatal-Enriched Protein Tyrosine Phosphatase Expression and Activity in Huntington's Disease: A STEP in the Resistance to Excitotoxicity"],"prefix":"10.1523","volume":"31","author":[{"given":"Ana","family":"Saavedra","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Albert","family":"Giralt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Ru\u00e9","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xavier","family":"Xifr\u00f3","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Xu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zaira","family":"Ortega","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 J.","family":"Lucas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paul J.","family":"Lombroso","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jordi","family":"Alberch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Esther","family":"P\u00e9rez-Navarro","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"393","published-online":{"date-parts":[[2011,6,1]]},"reference":[{"key":"2023041303504883000_31.22.8150.1","doi-asserted-by":"publisher","DOI":"10.1038\/sj.cdd.4401662"},{"key":"2023041303504883000_31.22.8150.2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1755-5949.2010.00134.x"},{"key":"2023041303504883000_31.22.8150.3","doi-asserted-by":"publisher","DOI":"10.1093\/hmg\/ddi443"},{"key":"2023041303504883000_31.22.8150.4","doi-asserted-by":"publisher","DOI":"10.1002\/jnr.10272"},{"key":"2023041303504883000_31.22.8150.5","doi-asserted-by":"publisher","DOI":"10.1002\/jnr.20492"},{"key":"2023041303504883000_31.22.8150.6","doi-asserted-by":"crossref","first-page":"1532","DOI":"10.1523\/JNEUROSCI.15-02-01532.1995","article-title":"Cellular and molecular characterization of a brain-enriched protein tyrosine phosphatase","volume":"15","author":"Boulanger","year":"1995","journal-title":"J Neurosci"},{"key":"2023041303504883000_31.22.8150.7","doi-asserted-by":"publisher","DOI":"10.1111\/j.1460-9568.2006.04837.x"},{"key":"2023041303504883000_31.22.8150.8","first-page":"337","article-title":"STEP: a family of brain-enriched PTPs. 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