| Autor: |
Waldeck, Bertil, Snider, Stuart R., Brown, Roger, Carlsson, Arvid |
| Zdroj: |
Naunyn-Schmiedeberg's Archives of Pharmacology; March 1975, Vol. 287 Issue: 1 p1-10, 10p |
| Abstrakt: |
Rats received intravenous injections of3H-tyrosine and were killed at various time intervals thereafter.3H-dopamine (DA) in the adrenals reached a maximum within 1.5 min after the administration of3H-tyrosine. From the 15th min it disappeared with an apparent half life of 90 min.3H-Adrenaline (A) +3H-noradrenaline(NA) increased much more slowly and reached a plateau 120–240 min after the injection. The approximate synthesis rate of adrenal A+NA, calculated from the specific activity curves, ranged from 9.3 to 2.2 nmoles/h per kg b.w. The highest value was noted the first few minutes, the lowest 1–2 hrs after the administration of3H-tyrosine. In some experiments subcellular fractionation of the adrenals was performed. In untreated animals the amount of DA and A+NA recovered from the supernatant fraction was about 10 and 8 per cent, respectively, of the total amount recovered from the supernatant and particulate fractions. In the adrenals of animals receiving3H-tyrosine 3.75 or 60 min beforehand these figures were significantly elevated whereas the DA and A+NA of the particulate fraction did not deviate significantly from control values. The specific activities of3H-DA were the same in the supernatant and particulate fractions within 3.75 min after the injection of3H-tyrosine. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink