Behaviour of tyrosine amino transferase and convertase during the first hours after hepatectomy in rats
✍ Scribed by Roberto Biondi; Maria Pia Viola-Magni
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 573 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0263-6484
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✦ Synopsis
The activity of rat liver tyrosine amino transferase ( T A T ) increases after hepatectomy with a first prominent peak at 8 h and a second peak at 18 h. This change in activity is probably due to de novo enzyme synthesis since it is prevented by actinomycin-D (AMD). I Z the same period an increase of the lysosomal converting enzyme (convertase) which catalyses the in vitro transition of T A T from form I t o form 111, has been observed; this is not accompanied by changes of other lysosomal enzymes, such as acid phosphatase and cathepsin L. The activity of convertase is equal t o that of the controls (sham operated animals) 2 h after hepatectomy, increases three times at 5 h, maintains the same value at 8 h and then decreases slowly to control level after 24 h. The correlation between the activity changes of the two enzymes strongly suggests a physiological role of convertase in T A T turnover.