{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T09:28:58Z","timestamp":1786354138133,"version":"build-2736575974"},"reference-count":60,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"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":["22306154"],"award-info":[{"award-number":["22306154"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"award":["22306154"],"award-info":[{"award-number":["22306154"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]},{"name":"NHC Key Laboratory of Prevention","award":["2023XBYSKF004"],"award-info":[{"award-number":["2023XBYSKF004"]}]},{"name":"Innovation Project of the Color Cloud Postdoctoral Program","award":["C615300504064"],"award-info":[{"award-number":["C615300504064"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biology"],"abstract":"<jats:p>Enrofloxacin (ENR) has been widely used in global aquaculture production, yet its hepatotoxic impacts under different operational administration modes remain poorly understood. Current environmental risk assessments and therapeutic guidelines generally assume that cumulative exposure dose dictates biological outcomes, largely ignoring the temporal patterns of drug administration. In the present study, we systematically compared the hepatotoxic, metabolic, and molecular effects of two matched-duration ENR administration regimens, continuous versus intermittent, on adult zebrafish (Danio rerio) at environmentally realistic concentrations (0.4, 4, and 40 \u03bcg\/L). Biochemical, histological, and lipidomic analyses revealed fundamentally divergent toxicological trajectories between the two regimens. While both regimens induced significant basal triglyceride and cholesterol depletion, continuous exposure drove progressive hepatocellular damage, characterized by elevated transaminase activities, unconstrained glycogen accumulation, and the eventual collapse of antioxidant defenses, culminating in severe lipid peroxidation. Mechanistically, continuous exposure triggered sustained pathological activation of the p38 MAPK signaling cascade and broad upregulation of de novo phosphatidylcholine (PC) and phosphatidylethanolamine (PE) biosynthesis. In contrast, intermittent exposure provided a critical physiological buffering window, whereby the depuration phase enabled a sustained, adaptive antioxidant response that successfully suppressed lipid peroxidation, significantly alleviated structural liver injury, and raised the activation threshold for the p38 stress response. Furthermore, lipidomic and transcriptional profiling demonstrated that intermittent exposure uniquely induced compensatory lipid remodeling, characterized by adaptive ceramide signaling and a metabolic shift. Taken together, these findings demonstrate that the temporal pattern of exposure critically dictates ENR hepatotoxicity, highlighting the need to perform discriminative risk assessment and providing a mechanistic basis for optimizing antibiotic stewardship in aquaculture.<\/jats:p>","DOI":"10.3390\/biology15161354","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T08:08:53Z","timestamp":1786349333000},"page":"1354","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Intermittent Administration Alleviates Enrofloxacin-Induced Hepatotoxicity in Zebrafish via Adaptive Lipid Remodeling and p38 MAPK Signaling"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1832-7832","authenticated-orcid":false,"given":"Jiangkun","family":"Yu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Bio-Resources, School of Life Sciences, Center for Life Sciences, Yunnan University, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yiming","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Bio-Resources, School of Life Sciences, Center for Life Sciences, Yunnan University, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yake","family":"Gao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Bio-Resources, School of Life Sciences, Center for Life Sciences, Yunnan University, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dingxi","family":"Pan","sequence":"additional","affiliation":[{"name":"School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingying","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Bio-Resources, School of Life Sciences, Center for Life Sciences, Yunnan University, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9699-9319","authenticated-orcid":false,"given":"Wei","family":"Guo","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Bio-Resources, School of Life Sciences, Center for Life Sciences, Yunnan University, Kunming 650500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"751","DOI":"10.1016\/j.jhazmat.2007.07.008","article-title":"Effluent from drug manufactures contains extremely high levels of pharmaceuticals","volume":"148","author":"Larsson","year":"2007","journal-title":"J. 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