PMID- 36194361 OWN - NLM STAT- MEDLINE DCOM- 20221101 LR - 20221101 IS - 1559-1182 (Electronic) IS - 0893-7648 (Linking) VI - 59 IP - 12 DP - 2022 Dec TI - Rapamycin Cannot Reduce Seizure Susceptibility in Infantile Rats with Malformations of Cortical Development Lacking mTORC1 Activation. PG - 7439-7449 LID - 10.1007/s12035-022-03033-9 [doi] AB - The mechanistic target of the rapamycin (mTOR) pathway is involved in cortical development. However, the efficacy of mTOR inhibitors in malformations of cortical dysplasia (MCD) outside of the tuberous sclerosis complex is unknown. We selected the MCD rat model with prenatal MAM exposure to test the efficacy of mTOR inhibitors in MCDs. We explored the early cortical changes of mTOR pathway protein expression in rats aged P15. We also monitored the early treatment effect of the mTOR inhibitor, rapamycin, on N-methyl-D-aspartate (NMDA)-induced spasms at P15 and their behavior in the juvenile stage. In vivo MR spectroscopy was performed after rapamycin treatment and compared with vehicle controls. There was no difference in mTORC1 pathway protein expression between MAM-exposed MCD rats and controls at P15, and prolonged treatment of rapamycin had no impact on NMDA-induced spasms despite poor weight gain. Prenatal MAM-exposed juvenile rats treated with rapamycin showed increased social approaching and freezing behavior during habituation. MR spectroscopy showed altered neurometabolites, including Gln, Glu+Gln, Tau, and Cr. Despite behavioral changes and in vivo neurometabolic alteration with early prolonged rapamycin treatment, rapamycin had no effect on spasms susceptibility in prenatal MAM-exposed infantile rats with MCD without mTORC1 activation. For MAM-exposed MCD rats without mTORC1 activation, treatment options outside of mTOR pathway inhibitors should be explored. CI - (c) 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature. FAU - Lee, Minyoung AU - Lee M AD - Department of Pediatrics, University of Ulsan College of Medicine, Seoul, 05505, Korea. AD - Asan Medical Center, Asan Institute for Life Sciences, Seoul, 05505, Korea. FAU - Kim, Eun-Jin AU - Kim EJ AD - Department of Pediatrics, University of Ulsan College of Medicine, Seoul, 05505, Korea. AD - Asan Medical Center, Asan Institute for Life Sciences, Seoul, 05505, Korea. FAU - Kim, Min-Jee AU - Kim MJ AD - Department of Pediatrics, Asan Medical Center Children's Hospital, 88 Olympic-ro, Songpa-ku, Seoul, 05505, Korea. FAU - Yum, Mi-Sun AU - Yum MS AUID- ORCID: 0000-0002-5986-5258 AD - Department of Pediatrics, University of Ulsan College of Medicine, Seoul, 05505, Korea. misun.yum@gmail.com. AD - Department of Pediatrics, Asan Medical Center Children's Hospital, 88 Olympic-ro, Songpa-ku, Seoul, 05505, Korea. misun.yum@gmail.com. LA - eng GR - NRF-2021R1A2C100447111/Ministry of Education/ PT - Journal Article DEP - 20221004 PL - United States TA - Mol Neurobiol JT - Molecular neurobiology JID - 8900963 RN - W36ZG6FT64 (Sirolimus) RN - EC 2.7.11.1 (Mechanistic Target of Rapamycin Complex 1) RN - 6384-92-5 (N-Methylaspartate) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) SB - IM MH - Pregnancy MH - Female MH - Animals MH - Rats MH - *Sirolimus/pharmacology MH - Mechanistic Target of Rapamycin Complex 1 MH - N-Methylaspartate MH - TOR Serine-Threonine Kinases/metabolism MH - *Malformations of Cortical Development MH - Seizures/drug therapy MH - Spasm OTO - NOTNLM OT - Malformations of cortical development (MCD) OT - Methylazoxymethanol (MAM) OT - N-methyl-D-aspartate (NMDA) OT - Rapamycin OT - mTOR EDAT- 2022/10/05 06:00 MHDA- 2022/11/02 06:00 CRDT- 2022/10/04 11:17 PHST- 2022/04/25 00:00 [received] PHST- 2022/09/04 00:00 [accepted] PHST- 2022/10/05 06:00 [pubmed] PHST- 2022/11/02 06:00 [medline] PHST- 2022/10/04 11:17 [entrez] AID - 10.1007/s12035-022-03033-9 [pii] AID - 10.1007/s12035-022-03033-9 [doi] PST - ppublish SO - Mol Neurobiol. 2022 Dec;59(12):7439-7449. doi: 10.1007/s12035-022-03033-9. Epub 2022 Oct 4.