Linked Life Data

2865664

Source:http://linkedlifedata.com/resource/pubmed/id/2865664

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PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
17
pubmed:dateCreated
1985-11-27
pubmed:abstractText
Newly synthesized tyrosine hydroxylase (TH) induced by reserpine was compared with the enzyme in control rats in terms of the molecular and physiological properties. When repeated doses of reserpine were given at daily intervals for three days, the enzyme activity measured in homogenates of the adrenal glands was increased 3-fold. Furthermore, when TH in the adrenal glands from both control and reserpine-treated rats was purified, both total activity of the enzyme and the enzyme protein content purified from reserpine-treated rats were also about 3-fold higher than those of the control rats. The two purified enzymes revealed similar properties; a single subunit with a Mr of 60,000 was observed by SDS polyacrylamide gel electrophoresis, and the Km value for a pterin cofactor, 6-methyl-tetrahydropterin was about 300 microM. In contrast, in situ TH activity measured under physiological conditions at pH 7.2 in adrenal tissue slices was elevated 6-fold by reserpine pretreatment for 3 days, and was stimulated by carbachol (0.1 mM) and elevated K+ (52 mM) in a roughly proportional rather than additive way relative to slices from untreated rats. These results indicate that newly synthesized TH induced by reserpine in rat adrenal gland had similar properties as the enzyme in control rats and that reserpine increased not only the amount of TH molecules but also the in situ activity of TH. Since reserpine also increases the biosynthesis of tetrahydrobiopterin as demonstrated by Viveros and co-workers, this 6-fold increase in in situ TH activity may depend both upon the 3-fold increase in the amount of enzyme molecules and upon the increase of the physiologically available tetrahydrobiopterin in the adrenal gland.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0024-3205
pubmed:author
pubmed:issnType
Print
pubmed:day
28
pubmed:volume
37
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1605-11
pubmed:dateRevised
2003-11-14
pubmed:meshHeading
pubmed:year
1985
pubmed:articleTitle
Molecular and physiological properties of tyrosine hydroxylase induced by reserpine in rat adrenal gland.
pubmed:publicationType
Journal Article