{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T18:03:21Z","timestamp":1775671401133,"version":"3.50.1"},"reference-count":68,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2021,7,21]],"date-time":"2021-07-21T00:00:00Z","timestamp":1626825600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Sardegna Ricerche, Progetto IBERNAT-NBL-P.O.R. Sardegna 2014-2020","award":["CUP F21B17000730005"],"award-info":[{"award-number":["CUP F21B17000730005"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Neurotrophins and their receptors are relevant factors in controlling neuroblastoma growth and progression. The histone deacetylase (HDAC) inhibitor valproic acid (VPA) has been shown to downregulate TrkB and upregulate the p75NTR\/sortilin receptor complex. In the present study, we investigated the VPA effect on the expression of the neurotrophin-3 (NT-3) receptor TrkC, a favorable prognostic marker of neuroblastoma. We found that VPA induced the expression of both full-length and truncated (TrkC-T1) isoforms of TrkC in human neuroblastoma cell lines without (SH-SY5Y) and with (Kelly, BE(2)-C and IMR 32) MYCN amplification. VPA enhanced cell surface expression of the receptor and increased Akt and ERK1\/2 activation by NT-3. The HDAC inhibitors entinostat, romidepsin and vorinostat also increased TrkC in SH-SY5Y, Kelly and BE(2)-C but not IMR 32 cells. TrkC upregulation by VPA involved induction of RUNX3, stimulation of ERK1\/2 and JNK, and ERK1\/2-mediated Egr1 expression. In SH-SY5Y cell monolayers and spheroids the exposure to NT-3 enhanced the apoptotic cascade triggered by VPA. Gene silencing of both TrkC-T1 and p75NTR prevented the NT-3 proapoptotic effect. Moreover, NT-3 enhanced p75NTR\/TrkC-T1 co-immunoprecipitation. The results indicate that VPA upregulates TrkC by activating epigenetic mechanisms and signaling pathways, and sensitizes neuroblastoma cells to NT-3-induced apoptosis. <\/jats:p>","DOI":"10.3390\/ijms22157790","type":"journal-article","created":{"date-parts":[[2021,7,21]],"date-time":"2021-07-21T11:53:23Z","timestamp":1626868403000},"page":"7790","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The Neurotrophin Receptor TrkC as a Novel Molecular Target of the Antineuroblastoma Action of Valproic Acid"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7330-2179","authenticated-orcid":false,"given":"Simona","family":"Dedoni","sequence":"first","affiliation":[{"name":"Laboratory of Cellular and Molecular Pharmacology, Section of Neurosciences, University of Cagliari, 09042 Monserrato, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luisa","family":"Marras","sequence":"additional","affiliation":[{"name":"Section of Microbiology, Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria C.","family":"Olianas","sequence":"additional","affiliation":[{"name":"Laboratory of Cellular and Molecular Pharmacology, Section of Neurosciences, University of Cagliari, 09042 Monserrato, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angela","family":"Ingianni","sequence":"additional","affiliation":[{"name":"Section of Microbiology, Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pierluigi","family":"Onali","sequence":"additional","affiliation":[{"name":"Laboratory of Cellular and Molecular Pharmacology, Section of Neurosciences, University of Cagliari, 09042 Monserrato, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"609","DOI":"10.1146\/annurev.biochem.72.121801.161629","article-title":"Trk receptors: Roles in neuronal signal transduction","volume":"72","author":"Huang","year":"2003","journal-title":"Annu. 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