Sentences with phrase «hydroxylase activity»

Researchers at Sweden's Karolinska Institute and at the National Institutes of Health are finding a connection between tyrosine hydroxylase activity, thyroid hormone receptors, and depleted dopamine levels in the brain — particularly in the substantia nigra, a region associated with the movement difficulties characteristic of Parkinson's disease.11, 12,13

Treatment of rats with 6 - hydroxydopamine, a drug which destroys sympathetic nerve terminals, leads to a decrease in serum dopamine - β - hydroxylase activity.

These data represent evidence that at least a portion of the circulating dopamine - β - hydroxylase activity arises from sympathetic nerve terminals.

Not exact matches

To shift into red pigment production, the enzyme flavonoid 3», 5» - hydroxylase (F3» 5 «h) is functionally inactivated in the 13 red - flowered species they examined by mutations that abolish enzyme activity.

The activity of HIF is therefore strictly regulated by a set of oxygen sensors known as the HIF - prolyl hydroxylases (PHDs).

In the Non-Classical form however, the 21 hydroxylase (21 - OH) enzyme is still working fairy well with only a slight reduction in activity, and cortisol levels are usually normal, while testosterone levels may be elevated to a variable degree.

Abstract: Both D4 dopamine receptor (DRD4) exon 3 and tyrosine hydroxylase (TH) intron 4 repeat polymorphisms have been linked to activity and impulsivity in German Shepherd Dogs (GSDs).