Document Detail


Maturation of hepatic desulfation activity in developing rats.
MedLine Citation:
PMID:  8772048     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study was carried out to further characterize the maturation of desulfation activity in developing rats. High levels of 3,3',5-triiodothyronine sulfate (T3S) were found in rat fetal serum whereas 3,3',5-triiodothyronine (T3) levels were low. The ratio of T3S/T3. was dramatically reversed in the rat maternal circulation. Maternal rats had higher desulfation activity than did near-term fetuses. Desulfation of T3S to T3 by microsomes of fetal and maternal livers were studied by incubating microsomes with T3S as a substrate. Desulfated T3 was measured by radioimmunoassay. The Km and Vmax values for desulfation of T3S to T3 by hepatic microsomes in different age groups were compared. Little desulfation activity was found in hepatic microsomal preparations from fetal rats compared with newborn rats. There was a trend of increasing desulfation activity in rats after birth until 1 month of age, although this was not significant. A surge of desulfating activity was observed between the 1- and 2-month old groups. The K(m) values for T3S desulfation activity were similar in all age groups. The Vmax values for the T3S to T3 desulfation activity progressively increased after birth until 2 months of age. The Vmax of the latter group, however, was comparable to that of the maternal group. These results suggest that the maturation of desulfation activity in the microsomal preparations from rat livers is completed by 2 months of age and is mainly due to increased enzyme capacity. Sulfation-desulfation of T3 may play a role in the thyroid hormone regulation of developing mammals.
Authors:
W S Huang; S W Kuo; W L Chen; K S Hsich; S Y Wu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the Formosan Medical Association = Taiwan yi zhi     Volume:  95     ISSN:  0929-6646     ISO Abbreviation:  J. Formos. Med. Assoc.     Publication Date:  1996 Jun 
Date Detail:
Created Date:  1996-10-17     Completed Date:  1996-10-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9214933     Medline TA:  J Formos Med Assoc     Country:  TAIWAN    
Other Details:
Languages:  eng     Pagination:  435-9     Citation Subset:  IM    
Affiliation:
Department of Nuclear Medicine, Tri-Service General Hospital, Taipei, Taiwan ROC.
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Female
Fetus / metabolism*
Liver / metabolism*
Pregnancy
Rats
Rats, Sprague-Dawley
Triiodothyronine / analogs & derivatives*,  metabolism*
Chemical
Reg. No./Substance:
31135-55-4/triiodothyronine sulfate; 6893-02-3/Triiodothyronine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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