Effects of high dietary methionine on activities of selected enzymes in the liver of kittens (felis domesticus) |
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Institution: | 1. Department of Food Engineering, Faculty of Health and Food Science, Universidad del Bío-Bío, Avda. Andrés Bello 720, Chillán, Chile;2. Department of Basic Sciences, Faculty of Scinces, Universidad del Bío-Bío, Avda. Andrés Bello 720, Chillán, Chile |
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Abstract: | - 1.1. Growing male kittens were fed an 18% casein diet supplemented with 2, 3, or 4% l-methionine (MET) for 6 weeks.
- 2.2. Free MET concentration in liver increased 30-fold and cystathionine two- to three-fold; the activity of adenosyl-MET transferase and cystathionase also increased but remained lower than previously found in rats.
- 3.3. Taurine concentration in liver decreased in cats fed excess MET and appeared to depend on taurine intake.
- 4.4. Alanine aminotransferase activity was high in all groups while serine dehydratase activity was very low.
- 5.5. Pyruvate kinase and malic enzyme activities which are normally low in cat liver increased after excess MET. Also, glucose 6-phosphate and 6-phosphogluconate dehydrogenases increased.
- 6.6. Cat liver metabolism showed limited adaptation to an excess dietary intake of methionine compared to that found in rats.
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