Garlick P J, McNurlan M A, Preedy V R
Biochem J. 1980 Nov 15;192(2):719-23. doi: 10.1042/bj1920719.
A rapid procedure for measuring the specific radioactivity of phenylalanine in tissues was developed. This facilitates the accurate determination of rates of protein synthesis in a wide range of tissues by injection of 150 mumol of L-[4-(3)H]phenylalanine/100 g body wt. The large dose of amino acid results in a rapid rise in specific radioactivity of free phenylalanine in tissues to values close to that in plasma, followed by a slow but linear fall. This enables the rate of protein synthesis to be calculated from measurements of the specific radioactivity of free and protein-bound phenylalanine in tissues during a 10 min period after injection of radioisotope.
开发了一种快速测量组织中苯丙氨酸比放射性的方法。通过注射150 μmol的L-[4-(³H)]苯丙氨酸/100 g体重,这有助于准确测定多种组织中的蛋白质合成速率。大剂量的氨基酸会导致组织中游离苯丙氨酸的比放射性迅速上升至接近血浆中的值,随后缓慢但呈线性下降。这使得在注射放射性同位素后的10分钟内,通过测量组织中游离和与蛋白质结合的苯丙氨酸的比放射性来计算蛋白质合成速率成为可能。