Study summary
Molecular basis for deficient acetaminophen glucuronidation in cats: an interspecies comparison of enzyme kinetics in liver microsomes
Read the original paper- Study type
- Lab
- Year
- 1997
- Species tested
- Cats, dogs, humans (liver microsomes)
- Published in
- Biochemical Pharmacology
How it was tested
An in-vitro comparison of acetaminophen-glucuronidating enzyme activity in liver microsomes across species.
Summary
A laboratory enzyme study that pinned down why cats handle phenolic compounds so poorly, comparing how liver enzymes from cats, dogs, humans, and other species process acetaminophen as a probe.
Key findings
Cats' high-affinity enzyme activity was more than ten times lower than that of dogs and humans, tracing the deficiency to very low liver levels of a specific glucuronosyltransferase. This is the mechanistic reason cats clear phenol-rich essential oils, and drugs like acetaminophen, far more slowly, and why those compounds are disproportionately toxic to them.
Limitations
An in-vitro microsomal model with small samples (four animals per key species), using acetaminophen as the test substrate rather than essential-oil constituents directly.