Abstract:
:Administration of tryptophan or hydrocortisone to rats caused a several-fold increase in tryptophan-2,3-dioxygenase activity in the liver. Highly purified lysosomes were isolated from livers of tryptophan- or hydrocortisone-treated animals as well as the control rats. Immunoblotting of lysosomal proteins with anti-tryptophan-2,3-dioxygenase showed 48 kDa band, corresponding to the subunit molecular weight of the enzyme. The relative amount of the immuno-reactive substance in the lysosomes from hydrocortisone-treated rats was 3 times higher than the control while the value in the lysosomes from tryptophan-treated rats was essentially the same as in the control. These results indicate that administration of tryptophan renders cytosolic tryptophan-2,3-dioxygenase less vulnerable to lysosomal uptake and causes an accumulation of the enzyme in the cytosol.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Sato A,Endo Y,Natori Ydoi
10.1016/0006-291x(92)91644-6subject
Has Abstractpub_date
1992-02-28 00:00:00pages
306-11issue
1eissn
0006-291Xissn
1090-2104pii
0006-291X(92)91644-6journal_volume
183pub_type
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