Species-Specific Differences in the in Vitro Metabolism of Lasiocarpine

Muluneh M. Fashe, Risto O. Juvonen, Aleksanteri Petsalo, Juha Rasanen, Markku Pasanen

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

There are species-related differences in the toxicity of pyrrolizidine alkaloids (PAs) partly attributable to the hepatic metabolism of these alkaloids. In this study, the metabolism of lasiocarpine, a potent hepatotoxic and carcinogenic food contaminant, was examined in vitro with human, pig, rat, mouse, rabbit, and sheep liver microsomes. A total of 12 metabolites (M1-M12) were detected with the human liver microsomes, of which M1, M2, M4, and M6 were unstable in the presence of reduced glutathione (GSH). With the exception of M3 and M8, the formation of all metabolites of lasiocarpine was catalyzed by CYP3A4 in humans. Tandem mass spectra (MS/MS) detected several new metabolites, termed M4-M7; their toxicological significance is unknown. M9 (m/z 398), identified as a demethylation product, was the main metabolite in all species, although the relative dominance of this metabolite was lower in humans. The level of the reactive metabolites, as measured by M1 ((3H-pyrrolizin-7-yl)methanol) and the GSH conjugate, was higher with the liver microsomes of susceptible species (human, pig, rat, and mouse) than with the species (rabbit and sheep) resistant to PA intoxication. In general, in addition to the new metabolites (M4-M7) that could make humans more susceptible to lasiocarpine-induced toxicity, the overall metabolite fingerprint detected with the human liver microsomes differed from that of all other species, yielding high levels of GSH-reactive metabolites.

Original languageEnglish (US)
Pages (from-to)2034-2044
Number of pages11
JournalChemical Research in Toxicology
Volume28
Issue number10
DOIs
StatePublished - Sep 22 2015
Externally publishedYes

Fingerprint

Metabolites
Metabolism
Liver Microsomes
Liver
Pyrrolizidine Alkaloids
Sheep
Swine
Toxicity
Rabbits
Rats
Cytochrome P-450 CYP3A
Dermatoglyphics
lasiocarpine
In Vitro Techniques
Alkaloids
Toxicology
Glutathione
Food
Impurities

ASJC Scopus subject areas

  • Toxicology

Cite this

Fashe, M. M., Juvonen, R. O., Petsalo, A., Rasanen, J., & Pasanen, M. (2015). Species-Specific Differences in the in Vitro Metabolism of Lasiocarpine. Chemical Research in Toxicology, 28(10), 2034-2044. https://doi.org/10.1021/acs.chemrestox.5b00253

Species-Specific Differences in the in Vitro Metabolism of Lasiocarpine. / Fashe, Muluneh M.; Juvonen, Risto O.; Petsalo, Aleksanteri; Rasanen, Juha; Pasanen, Markku.

In: Chemical Research in Toxicology, Vol. 28, No. 10, 22.09.2015, p. 2034-2044.

Research output: Contribution to journalArticle

Fashe, MM, Juvonen, RO, Petsalo, A, Rasanen, J & Pasanen, M 2015, 'Species-Specific Differences in the in Vitro Metabolism of Lasiocarpine', Chemical Research in Toxicology, vol. 28, no. 10, pp. 2034-2044. https://doi.org/10.1021/acs.chemrestox.5b00253
Fashe, Muluneh M. ; Juvonen, Risto O. ; Petsalo, Aleksanteri ; Rasanen, Juha ; Pasanen, Markku. / Species-Specific Differences in the in Vitro Metabolism of Lasiocarpine. In: Chemical Research in Toxicology. 2015 ; Vol. 28, No. 10. pp. 2034-2044.
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