PMID- 26437182 OWN - NLM STAT- MEDLINE DCOM- 20160916 LR - 20181202 IS - 1940-087X (Electronic) IS - 1940-087X (Linking) IP - 103 DP - 2015 Sep 23 TI - Rapid In Situ Hybridization using Oligonucleotide Probes on Paraformaldehyde-prefixed Brain of Rats with Serotonin Syndrome. LID - 10.3791/53165 [doi] LID - 53165 AB - 3,4-Methylenedioxymethamphetamine (MDMA; ecstasy) toxicity may cause region-specific changes in serotonergic mRNA expression due to acute serotonin (5-hydroxytryptamine; 5-HT) syndrome. This hypothesis can be tested using in situ hybridization to detect the serotonin 5-HT2A receptor gene htr2a. In the past, such procedures, utilizing radioactive riboprobe, were difficult because of the complicated workflow that needs several days to perform and the added difficulty that the technique required the use of fresh frozen tissues maintained in an RNase-free environment. Recently, the development of short oligonucleotide probes has simplified in situ hybridization procedures and allowed the use of paraformaldehyde-prefixed brain sections, which are more widely available in laboratories. Here, we describe a detailed protocol using non-radioactive oligonucleotide probes on the prefixed brain tissues. Hybridization probes used for this study include dapB (a bacterial gene coding for dihydrodipicolinate reductase), ppiB (a housekeeping gene coding for peptidylprolyl isomerase B), and htr2a (a serotonin gene coding for 5-HT2A receptors). This method is relatively simply, cheap, reproducible and requires less than two days to complete. FAU - Shokry, Ibrahim M AU - Shokry IM AD - Ross University School of Veterinary Medicine. FAU - Callanan, John J AU - Callanan JJ AD - Ross University School of Veterinary Medicine. FAU - Sousa, John AU - Sousa J AD - Charles E. Schmidt College of Medicine, Florida Atlantic University. FAU - Tao, Rui AU - Tao R AD - Charles E. Schmidt College of Medicine, Florida Atlantic University; rtao@health.fau.edu. LA - eng GR - R15 DA029863/DA/NIDA NIH HHS/United States GR - R15DA029863/DA/NIDA NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Video-Audio Media DEP - 20150923 PL - United States TA - J Vis Exp JT - Journal of visualized experiments : JoVE JID - 101313252 RN - 0 (Fixatives) RN - 0 (Oligonucleotide Probes) RN - 0 (Polymers) RN - 0 (RNA, Messenger) RN - 0 (Receptor, Serotonin, 5-HT2A) RN - 137497-17-7 (cyclophilin B) RN - 1HG84L3525 (Formaldehyde) RN - EC 1.17.1.8 (Dihydrodipicolinate Reductase) RN - EC 5.2.1.- (Cyclophilins) RN - KE1SEN21RM (N-Methyl-3,4-methylenedioxyamphetamine) RN - Y19UC83H8E (paraform) SB - IM MH - Animals MH - *Brain Chemistry MH - Cyclophilins/genetics MH - Dihydrodipicolinate Reductase/genetics MH - Fixatives/chemistry MH - Formaldehyde/chemistry MH - In Situ Hybridization/*methods MH - N-Methyl-3,4-methylenedioxyamphetamine/toxicity MH - *Oligonucleotide Probes MH - Paraffin Embedding/methods MH - Polymers/chemistry MH - RNA, Messenger/metabolism MH - Random Allocation MH - Rats MH - Receptor, Serotonin, 5-HT2A/genetics MH - Serotonin Syndrome/*genetics/metabolism MH - Tissue Fixation/methods PMC - PMC4692616 MID - NIHMS849888 EDAT- 2015/10/06 06:00 MHDA- 2016/09/17 06:00 PMCR- 2017/09/23 CRDT- 2015/10/06 06:00 PHST- 2015/10/06 06:00 [entrez] PHST- 2015/10/06 06:00 [pubmed] PHST- 2016/09/17 06:00 [medline] PHST- 2017/09/23 00:00 [pmc-release] AID - 53165 [pii] AID - 10.3791/53165 [doi] PST - epublish SO - J Vis Exp. 2015 Sep 23;(103):53165. doi: 10.3791/53165.