{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T00:59:20Z","timestamp":1760057960202,"version":"build-2065373602"},"reference-count":59,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2025,3,7]],"date-time":"2025-03-07T00:00:00Z","timestamp":1741305600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Universidad Nacional de Colombia","award":["DI001269"],"award-info":[{"award-number":["DI001269"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Mitochondrial respiratory parameters (state 2 mitochondrial respiratory activity (state 2), state 3 mitochondrial respiratory activity (state 3), respiratory control (RC), mitochondrial ATP synthetic activity (MASA), and oxidative phosphorylation efficiency (ADP:O)) were assayed in heart homogenates (HHs) and in unwashed isolated mitochondria (isolated crude heart mitochondria (CHMs)), using rats sacrificed 3, 6, 24, and 48 h after receiving a subcutaneous injection of (\u2212)-isoproterenol (67 mg\/kg body weight). With HHs, the following was observed: (a) a statistically significant activation of RC and MASA at 3 h and 6 h after drug infusion; at those times, state 2, state 3, and ADP:O were not different. (b) No studied (\u2212)-isoproterenol mitochondrial parameters were statistically different at 24 h and 48 h after drug administration. So extrapolating, (\u2212)-isoproterenol treatment does not negatively impact mitochondrial respiratory function in vivo; on the contrary, a better 3 h and 6 h (\u2212)-isoproterenol mitochondrial energetic functional state was observed. With CHMs, the following was observed: (a) a statistically significant activation of RC and MASA at 3 h, but no longer at 6 h after drug infusion. (b) No studied mitochondrial parameters were statistically different at 24 h after (\u2212)-isoproterenol treatment, but at 48 h, a statistical decrease took place in (\u2212)-isoproterenol RC, so the mitochondrial isolation procedure (MIP) causes additional negative alterations to the mitochondrial samples; therefore, isoproterenol-induced negative alterations of mitochondrial respiratory parameters reported in the literature using isolated heart mitochondria (IHMs) are possibly an experimental artefact.<\/jats:p>","DOI":"10.3390\/ijms26062388","type":"journal-article","created":{"date-parts":[[2025,3,7]],"date-time":"2025-03-07T07:05:46Z","timestamp":1741331146000},"page":"2388","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Negative Alterations in the Respiratory Activity of Isolated Crude Heart Mitochondria Following In Vivo Isoproterenol Injection in Rats Are Not Observed in Heart Homogenate Suggesting That the Isolation Procedure Generates Experimental Artefacts"],"prefix":"10.3390","volume":"26","author":[{"given":"Dairo Alonso","family":"Rendon","sequence":"first","affiliation":[{"name":"Laboratorio de Biof\u00edsica, Departamento de F\u00edsica, Facultad de Ciencias, Universidad Nacional de Colombia\u2014Sede Medell\u00edn, Medell\u00edn AA3840, Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,7]]},"reference":[{"key":"ref_1","unstructured":"Hurst, J.W., Schlant, R.C., Rackley, C.E., Sonnenblick, E.H., and Wenger, N.K. 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