{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T02:00:48Z","timestamp":1790992848017,"version":"4.1.0"},"reference-count":84,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2024,7,8]],"date-time":"2024-07-08T00:00:00Z","timestamp":1720396800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82073829"],"award-info":[{"award-number":["82073829"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82373850"],"award-info":[{"award-number":["82373850"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["Z221100007922035"],"award-info":[{"award-number":["Z221100007922035"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Pharmaceutical Innovation Varieties and Platform Cultivation Projects founded by Beijing Municipal Science &amp; Technology Commission, Administrative Commission of Zhongguancun Science Park","award":["82073829"],"award-info":[{"award-number":["82073829"]}]},{"name":"Pharmaceutical Innovation Varieties and Platform Cultivation Projects founded by Beijing Municipal Science &amp; Technology Commission, Administrative Commission of Zhongguancun Science Park","award":["82373850"],"award-info":[{"award-number":["82373850"]}]},{"name":"Pharmaceutical Innovation Varieties and Platform Cultivation Projects founded by Beijing Municipal Science &amp; Technology Commission, Administrative Commission of Zhongguancun Science Park","award":["Z221100007922035"],"award-info":[{"award-number":["Z221100007922035"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The application of intracerebroventricular injection of streptozotocin (ICV-STZ) is considered a useful animal model to mimic the onset and progression of sporadic Alzheimer\u2019s disease (sAD). In rodents, on day 7 of the experiment, the animals exhibit depression-like behaviors. Indoleamine 2,3-dioxygenase (IDO), a rate-limiting enzyme catalyzing the conversion of tryptophan (Trp) to kynurenine (Kyn), is closely related to depression and AD. The present study aimed to investigate the pathophysiological mechanisms of preliminary depression-like behaviors in ICV-STZ rats in two distinct cerebral regions of the medial prefrontal cortex, the prelimbic cortex (PrL) and infralimbic cortex (IL), both presumably involved in AD progression in this model, with a focus on IDO-related Kyn pathways. The results showed an increased Kyn\/Trp ratio in both the PrL and IL of ICV-STZ rats, but, intriguingly, abnormalities in downstream metabolic pathways were different, being associated with distinct biological effects. In the PrL, the neuroprotective branch of the Kyn pathway was attenuated, as evidenced by a decrease in the kynurenic acid (KA) level and Kyn aminotransferase II (KAT II) expression, accompanied by astrocyte alterations, such as the decrease in glial fibrillary acidic protein (GFAP)-positive cells and increase in morphological damage. In the IL, the neurotoxicogenic branch of the Kyn pathway was enhanced, as evidenced by an increase in the 3-hydroxy-kynurenine (3-HK) level and kynurenine 3-monooxygenase (KMO) expression paralleled by the overactivation of microglia, reflected by an increase in ionized calcium-binding adaptor molecule 1 (Iba1)-positive cells and cytokines with morphological alterations. Synaptic plasticity was attenuated in both subregions. Additionally, microinjection of the selective IDO inhibitor 1-Methyl-DL-tryptophan (1-MT) in the PrL or IL alleviated depression-like behaviors by reversing these different abnormalities in the PrL and IL. These results suggest that the antidepressant-like effects linked to Trp metabolism changes induced by 1-MT in the PrL and IL occur through different pathways, specifically by enhancing the neuroprotective branch in the PrL and attenuating the neurotoxicogenic branch in the IL, involving distinct glial cells.<\/jats:p>","DOI":"10.3390\/ijms25137496","type":"journal-article","created":{"date-parts":[[2024,7,8]],"date-time":"2024-07-08T14:40:50Z","timestamp":1720449650000},"page":"7496","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Inhibition of Indoleamine 2,3-Dioxygenase Exerts Antidepressant-like Effects through Distinct Pathways in Prelimbic and Infralimbic Cortices in Rats under Intracerebroventricular Injection with Streptozotocin"],"prefix":"10.3390","volume":"25","author":[{"given":"Yu","family":"Qin","sequence":"first","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao","family":"Hu","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hui-Ling","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nurhumar","family":"Kurban","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xi","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0675-8456","authenticated-orcid":false,"given":"Jing-Kun","family":"Yi","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Su-Ying","family":"Cui","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong-He","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Pharmacology, School of Basic Medical Sciences, Peking University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Aguera-Ortiz, L., Garcia-Ramos, R., Grandas Perez, F.J., Lopez-Alvarez, J., Montes Rodriguez, J.M., Olazaran Rodriguez, F.J., Olivera Pueyo, J., Pelegrin Valero, C., and Porta-Etessam, J. 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