{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T12:57:23Z","timestamp":1769605043771,"version":"3.49.0"},"reference-count":50,"publisher":"Canadian Science Publishing","issue":"7","license":[{"start":{"date-parts":[[2022,7,1]],"date-time":"2022-07-01T00:00:00Z","timestamp":1656633600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":["cdnsciencepub.com"],"crossmark-restriction":false},"short-container-title":["Can. J. Physiol. Pharmacol."],"published-print":{"date-parts":[[2022,7,1]]},"abstract":"<jats:p> 1,2,3,4-tetrahydroisoquinoline (TIQ) is endogenously present in the human brain, and some of its derivatives are thought to contribute to the induction of Parkinson's disease (PD)-like signs in rodents and primates. In contrast, the endogenous TIQ derivative 1-methyl-TIQ (1-MeTIQ) is reported to be neuroprotective. In the present study, we compared the effects of artificially modified 1-MeTIQ derivatives (loading an N-propyl, N-propenyl, N-propargyl, or N-butynyl group) on 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced PD-like signs in mice. In a behavioral study, MPTP-induced bradykinesia was significantly decreased by all compounds. However, only 1-Me- N-propargyl-TIQ showed an inhibitory effect by blocking the MPTP-induced reduction in striatal dopamine content and the number of nigral tyrosine hydroxylase-positive cells. Western blot analysis showed that 1-Me- N-propargyl-TIQ and 1-Me- N-butynyl-TIQ potently prevented the MPTP-induced decrease in dopamine transporter expression, whereas 1-MeTIQ and 1-Me- N-propyl-TIQ did not. These results suggest that although loading an N-propargyl group on 1-MeTIQ clearly enhanced neuroprotective effects, other N-functional groups showed distinct pharmacological properties characteristic of their functional groups. Thus, the number of bonds and length of the N-functional group may contribute to the observed differences in effect. <\/jats:p>","DOI":"10.1139\/cjpp-2021-0659","type":"journal-article","created":{"date-parts":[[2022,4,12]],"date-time":"2022-04-12T21:34:46Z","timestamp":1649799286000},"page":"594-611","update-policy":"https:\/\/doi.org\/10.1139\/csp-crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Preventative effects of 1-methyl-1,2,3,4-tetrahydroisoquinoline derivatives (<i>N<\/i>-functional group loading) on MPTP-induced parkinsonism in mice"],"prefix":"10.1139","volume":"100","author":[{"given":"Hiroko","family":"Munakata","sequence":"first","affiliation":[{"name":"Department of Pharmacology, School of Pharmaceutical Sciences, Ohu University","place":["Koriyama, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Risa","family":"Ishikawa","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Pharmaceutical Sciences, Ohu University","place":["Koriyama, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshiaki","family":"Saitoh","sequence":"additional","affiliation":[{"name":"Faculty of Pharmaceutical Sciences, Nihon Pharmaceutical University","place":["Kita-adachigun, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshie","family":"Kambe","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, Showa Pharmaceutical University","place":["Machida, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Terumasa","family":"Chiba","sequence":"additional","affiliation":[{"name":"Faculty of Pharmaceutical Sciences, Nihon Pharmaceutical University","place":["Kita-adachigun, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyoji","family":"Taguchi","sequence":"additional","affiliation":[{"name":"Department of Medicinal Pharmacology, Showa Pharmaceutical University","place":["Machida, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenji","family":"Abe","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Pharmaceutical Sciences, Ohu University","place":["Koriyama, Japan"]},{"name":"Faculty of Pharmaceutical Sciences, Nihon Pharmaceutical University","place":["Kita-adachigun, Japan"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"155","reference":[{"key":"refg1\/ref1","doi-asserted-by":"publisher","DOI":"10.1248\/bpb.28.1355"},{"key":"refg2\/ref2","doi-asserted-by":"publisher","DOI":"10.1016\/S0361-9230(01)00603-7"},{"key":"refg3\/ref3","doi-asserted-by":"publisher","DOI":"10.1046\/j.1471-4159.2001.00391.x"},{"key":"refg4\/ref4","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.neulet.2003.10.067","volume":"355","author":"Bar-Am O.","year":"2004","journal-title":"Neurosci. 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