Impact of Microcystin-LR on Liver Function Varies by Dose and Sex in Mice

Toxins

Shambhunath Choudhary¹  MarkA. Morse¹  Igor Mrdjen²  ThomasJ. Knobloch²  Jiyoung Lee²  ChristopherM. Weghorst²  RandallJ. Ruch³ 

[1] Charles River Laboratories, Spencerville, OH 45887, USA;College of Public Health, Division of Environmental Health Sciences, The Ohio State University, Columbus, OH 43210, USA;Department of Cancer Biology, University of Toledo, Toledo, OH 43614, USA;

关键词: liver health;    ingestion;    acute exposure;    harmful algal blooms;    female and male;    cyanotoxin;   

DOI  :  10.3390/toxins10110435

来源: DOAJ

【 摘 要 】

Microcystin (MC) exposure is an increasing concern because more geographical locations are covered with cyanobacterial blooms as eutrophication and bloom-favoring environmental factors become more prevalent worldwide. Acute MC exposure has been linked to gastrointestinal distress, liver toxicity, and death in extreme circumstances. The goal of this study was to provide an accurate and comprehensive description of MC-LRs impacts on liver pathology, clinical chemistry, and gap junction intercellular communication (GJIC) in CD-1 male and female mice. Mice were exposed to 0, 3000, and 5000/4000 µg/kg/day MC-LR, daily for 7 days, and were necropsied on Day 8. Blood samples for clinical chemistry analysis were processed to serum, while liver sections were fixed for histopathology or evaluated for GJIC using fluorescent cut-load dye. Results show a dose-dependent relationship with MC-LR exposure and hepatocellular hypertrophy, degradation, and necrosis. Clinical chemistry parameters alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, total bilirubin, and cholesterol increased significantly in MC-LR exposed mice. Clinical chemistry parameter analysis showed significantly increased susceptibility to MC-LR in females compared to males. Changes in GJIC were not noted, but localization of hepatotoxicity near the central veins and midlobular areas was seen. Future toxicity studies involving MCs should consider response differences across sexes, differing MC congeners, and combinatorial exposures involving other cyanotoxins.

【 授权许可】

Unknown