Synthesis and biological characterization of99mTc(I) tricarbonyl cysteine complex, a potential diagnostic for assessment of renal function
作者:Sang Hyun Park、Beom Su Jang、Kyung Bae Park
DOI:10.1002/jlcr.897
日期:2005.1
Cysteine containing three functional groups, i.e. a carboxyl, sulfhydryl, and amino group, has been labelled with 99mTc(I) tricarbonyl precursor (2) in order to study the renal characteristics of the resulting 99mTc(I) tricarbonyl cysteine (3) versus the reference 99mTc-MAG3 (1). The 99mTc(I) tricarbonyl cysteine (3) was prepared in good yields and characterized by HPLC, eletrophoresis, and eletrospray mass spectrometry. The plasma protein binding rate of 99mTc(I) tricarbonyl cysteine (3) was about 70 to 80%, and similar to that of 131I-OIH (70%) but lower than that of 99mTc-MAG3 (90%). The T1/2 of 99mTc(I) tricarbonyl cysteine (4.30±0.79 min) in the kidney was higher than the one of 99mTc-MAG3 (2.43±0.70 min). The static image of 99mTc(I) tricarbonyl cysteine at 5 min post injection showed high concentrated activity in the kidney. And in the 15, 30 min post injection images, most activity appeared in the bladder without a residue in other organs. The 99mTc(I) tricarbonyl cysteine exhibited biological behavior comparable to 99mTc-MAG3 and it is expected to have diagnostic potential for imaging renal function in nuclear medicine. Copyright © 2004 John Wiley & Sons, Ltd.
用 99mTc(I) 三羰基前体 (2) 标记了含有三个官能团(即羧基、巯基和氨基)的半胱氨酸,以研究得到的 99mTc(I) 三羰基半胱氨酸 (3) 与参照物 99mTc-MAG3 (1) 的肾脏特征。99mTc(I) 三羰基半胱氨酸 (3) 的制备收率很高,并通过高效液相色谱法、电泳法和电喷雾质谱法进行了表征。99mTc(I) 三羰基半胱氨酸(3)的血浆蛋白结合率约为 70% 至 80%,与 131I-OIH 的结合率(70%)相似,但低于 99mTc-MAG3 的结合率(90%)。肾脏中 99mTc(I) 三羰基半胱氨酸的 T1/2 值(4.30±0.79 分钟)高于 99mTc-MAG3 的 T1/2 值(2.43±0.70 分钟)。注射后 5 分钟,99m锝(I)三羰基半胱氨酸的静态图像显示肾脏中的高浓度活性。而在注射后 15、30 分钟的图像中,大部分活性出现在膀胱,其他器官无残留。99mTc(I) 三羰基半胱氨酸的生物学行为与 99mTc-MAG3 相当,有望在核医学的肾功能成像中发挥诊断潜力。Copyright © 2004 John Wiley & Sons, Ltd. All Rights Reserved.