Journal of Toxicologic Pathology
Online ISSN : 1881-915X
Print ISSN : 0914-9198
Technical Report
Imaging mass spectrometry for toxicity assessment: a useful technique to confirm drug distribution in histologically confirmed lesions
Akane KashimuraKouji TanakaHiroko SatoHidefumi KajiMasaharu Tanaka
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2018 Volume 31 Issue 3 Pages 221-227


To evaluate the usefulness of imaging mass spectrometry (IMS) technology for assessing drug toxicity, we analyzed animal tissues in an amiodarone (AMD)-induced phospholipidosis model by IMS and confirmed the relationship between the distribution of AMD, its metabolites, and representative phospholipids (phosphatidylcholine, PC) and histological changes. AMD was administered to rats for 7 days at 150 mg/kg/day. The lung, spleen, and mesenteric lymph node were histologically examined and analyzed using IMS. The detection intensities of AMD, its metabolites, and typical PCs were higher in regions infiltrated by foamy macrophages compared with normal areas. This tendency was common in all three organs analyzed in this study. For the spleen, signals for AMD, its metabolites, and typical PCs were significantly more intense in the marginal zone, where foamy macrophages and vacuolated lymphocytes are abundant, than in the other areas. These results indicate that AMD, its metabolites, and PCs accumulate together in foamy or vacuolated cells, which is consistent with the mechanism of AMD-induced phospholipidosis. They also indicate that IMS is a useful technique for evaluating the distribution of drugs and biological components in the elucidation of toxicity mechanisms.

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© 2018 The Japanese Society of Toxicologic Pathology
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