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Genetic activation of mTORC1, a potent regulator of cellular metabolism and protein translation, improves axon regeneration of peripheral neurons by an unresolved mechanism. To gain insight into this process, we activated mTORC1 signaling in mouse nociceptors via genetic deletion of its negative regulator Tsc2. Perinatal deletion of Tsc2 in nociceptors enhanced initial axon growth after sciatic nerve crush, however by 3 d post-injury axon elongation rate became similar to controls. mTORC1 inhibition prior to nerve injury was required to suppress the enhanced axon growth. Gene expression analysis in purified nociceptors revealed that Tsc2-deficient nociceptors had increased activity of regeneration-associated transcription factors (RATFs), including cJun and Atf3, in the absence of injury. Additionally, nociceptor deletion of Tsc2 activated satellite glial cells and macrophages in the dorsal root ganglia (DRG) in a similar manner to nerve injury. Surprisingly, these changes improved axon length but not percentage of initiating axons in dissociated cultures. The pro-regenerative environment in na\u00efve DRG was recapitulated by AAV8-mediated deletion of Tsc2 in adult mice, suggesting that this phenotype does not result from a developmental effect. Consistently, AAV8-mediated Tsc2 deletion did not improve behavioral recovery after a sciatic nerve crush injury despite initially enhanced axon growth. Together, these data show that neuronal mTORC1 activation induces an incomplete pro-regenerative environment in the DRG that improves initial but not later axon growth after nerve injury.<\/jats:p>","DOI":"10.1523\/eneuro.0168-19.2019","type":"journal-article","created":{"date-parts":[[2019,6,10]],"date-time":"2019-06-10T21:45:24Z","timestamp":1560203124000},"page":"ENEURO.0168-19.2019","source":"Crossref","is-referenced-by-count":31,"title":["Nociceptor Deletion of Tsc2 Enhances Axon Regeneration by Inducing a Conditioning Injury Response in Dorsal Root Ganglia"],"prefix":"10.1523","volume":"6","author":[{"given":"Dan","family":"Carlin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexandra E.","family":"Halevi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eric E.","family":"Ewan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amy M.","family":"Moore","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valeria","family":"Cavalli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"393","published-online":{"date-parts":[[2019,6,10]]},"reference":[{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.1","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M110.125336"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.2","doi-asserted-by":"publisher","DOI":"10.1002\/gene.20010"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.3","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.0931-17.2017"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.4","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuron.2015.03.060"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.5","doi-asserted-by":"publisher","DOI":"10.1016\/j.expneurol.2015.12.015"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.6","doi-asserted-by":"publisher","DOI":"10.1038\/nrn3176"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.7","doi-asserted-by":"publisher","DOI":"10.1523\/ENEURO.0436-17.2018"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.8","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuron.2016.01.034"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.9","doi-asserted-by":"publisher","DOI":"10.1016\/0165-0270(94)90144-9"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.10","doi-asserted-by":"crossref","unstructured":"Chen W , Lu N , Ding Y , Wang Y , Chan LT , Wang X , Gao X , Jiang S , Liu K (2016) Rapamycin-resistant mTOR activity is required for sensory axon regeneration induced by a conditioning lesion. eNeuro 3:pii: ENEURO.0358-16.2016.","DOI":"10.1523\/ENEURO.0358-16.2016"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.11","doi-asserted-by":"publisher","DOI":"10.1016\/j.mcn.2015.05.001"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.12","doi-asserted-by":"publisher","DOI":"10.1016\/j.celrep.2018.01.006"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.13","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.pa.20.040180.002301"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.14","doi-asserted-by":"publisher","DOI":"10.1093\/hmg\/ddv383"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.15","first-page":"357","article-title":"Glial cell and macrophage reactions in rat spinal ganglion after peripheral nerve lesions: an immunocytochemical and morphometric study","volume":"139","year":"2001","journal-title":"Arch Ital Biol"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.16","doi-asserted-by":"publisher","DOI":"10.1523\/ENEURO.0095-18.2018"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.17","doi-asserted-by":"publisher","DOI":"10.1016\/j.expneurol.2018.02.012"},{"key":"2023041302134354000_6.3.ENEURO.0168-19.2019.18","doi-asserted-by":"crossref","unstructured":"Gey M , Wanner R , Schilling C , Pedro MT , Sinske D , Knoll B (2016) Atf3 mutant mice show reduced axon regeneration and impaired regeneration-associated gene induction after peripheral nerve injury. 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