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Central responsiveness to body-weight-reducing mediators, e.g., to leptin, changes during aging in a way, which may promote middle-aged obesity and aging cachexia. Leptin is connected to urocortin 2 (Ucn2), an anorexigenic and hypermetabolic member of the corticotropin family. We aimed to study the role of Ucn2 in middle-aged obesity and aging cachexia. The food intake, body weight and hypermetabolic responses (oxygen consumption, core temperature) of male Wistar rats (3, 6, 12 and 18 months) were tested following intracerebroventricular injections of Ucn2. Following one central injection, Ucn2-induced anorexia lasted for 9 days in the 3-month, 14 days in the 6-month and 2 days in the 18-month group. Middle-aged 12-month rats failed to show anorexia or weight loss. Weight loss was transient (4 days) in the 3-month, 14 days in the 6-month and slight but long-lasting in the 18-month rats. Ucn2-induced hypermetabolism and hyperthermia increased with aging. The age-dependent changes in the mRNA expression of Ucn2 detected by RNAscope in the paraventricular nucleus correlated with the anorexigenic responsiveness. Our results show that age-dependent changes in Ucn2 may contribute to middle-aged obesity and aging cachexia. Ucn2 shows potential in the prevention of middle-aged obesity.<\/jats:p>","DOI":"10.3390\/ijms24108992","type":"journal-article","created":{"date-parts":[[2023,5,19]],"date-time":"2023-05-19T10:35:11Z","timestamp":1684492511000},"page":"8992","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Aging Changes the Efficacy of Central Urocortin 2 to Induce Weight Loss in Rats"],"prefix":"10.3390","volume":"24","author":[{"given":"D\u00f3ra K.","family":"Kov\u00e1cs","sequence":"first","affiliation":[{"name":"Institute for Translational Medicine, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szimonetta","family":"Eitmann","sequence":"additional","affiliation":[{"name":"Institute for Translational Medicine, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gergely","family":"Berta","sequence":"additional","affiliation":[{"name":"Department of Medical Biology, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3360-2425","authenticated-orcid":false,"given":"Vikt\u00f3ria","family":"Kormos","sequence":"additional","affiliation":[{"name":"Department of Pharmacology and Pharmacotherapy, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2830-2732","authenticated-orcid":false,"given":"Bal\u00e1zs","family":"Gaszner","sequence":"additional","affiliation":[{"name":"Department of Anatomy, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Erika","family":"P\u00e9terv\u00e1ri","sequence":"additional","affiliation":[{"name":"Institute for Translational Medicine, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4377-9758","authenticated-orcid":false,"given":"M\u00e1rta","family":"Balask\u00f3","sequence":"additional","affiliation":[{"name":"Institute for Translational Medicine, Medical School, University of P\u00e9cs, Szigeti \u00fat 12., 7624 Pecs, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,19]]},"reference":[{"key":"ref_1","unstructured":"(2023, March 16). 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