SHNH法和NHS-MAG3法标记的99mTc-寡聚核苷酸的比较

比较研究采用联肼尼克酰胺(Hydrazino Nicotinamide Derivative, SHNH)法和N-羟基琥珀酰胺基S-乙酰巯基乙酰三氨基乙酸(N-hydroxysuccinimidyl S-acetylmercaptoacetyltriglycline,NHS-MAG3)法以99mTc标记反义寡聚核苷酸(Antisense Oligonucleotide,ASON)的标记物的放射化学和生物学特性.合成SHNH和NHS-MAG3后,分别以SHNH和NHS-MAG3为双功能络(螯)合剂,用99mTc标记ASON;比较标记物99mTc-SHNH-ASON和99mTc-MAG3-ASON的体内外稳定性、兔血浆蛋白结合、正常BALB/C小鼠体内分布及结肠腺癌HT29细胞摄取的情况.结果显示,采用NHS-MAG3法标记的标记物99mTc-MAG3-ASON的标记率和稳定性明显高于SHNH法标记的标记物99mTc-SHNH-ASON(P＜0.05)、血浆蛋白结合率显著低于99mTc-SHNH-ASON(P＜0.05);99mTc-MAG3-ASON在血液、心脏、胃、肠的分布显著低于99mTc-SHNH-ASON(P＜0.05),而在肝、脾的分布略低于99mTc-SHNH-ASON(P＞0.05),但在肾的分布显著高于99mTc-SHNH-ASON(P＜0.05);99mTc-MAG3-ASON的HT29细胞摄取率显著高于99mTc-SHNH-ASON(P＜0.05).因此,采用NHS-MAG3法的标记物99mTc-MAG3-ASON的放射化学和生物学特性明显优于SHNH法的标记物99mTc-SHNH-ASON.

A Comparison on Radiochemical Behavior and Biological Property of Antisense Oligonucleotide Labeled with Technetium-99m by Two Methods:NHS-MAG3 versus SHNHP

This study was undertaken to explore and compare the radiochemical behavior and biological property of antisense oligonucleotide (ASON) labeled with Technetium-99m using two methods: N-hydroxysuccinimidyl S-acetylmercaptoacetyltriglycline (NHS-MAG3) versus hydrazino nicotinamide derivative (SHNH). After SHNH and NHS-MAG3 were synthesized, ASON was labeled with Technetium-99m using SHNH and NHS-MAG3 as a bifunctional chelator, separately. The stability in vivo and in vitro, the combination with plasma albumen of rabbit, the biodistribution in BALB/ C mice and the HT29 cellular uptake were compared between labeled compound 99mTc-SHNH-ASON, using SHNH as a bifunctional complex reagent, and 99mTc-MAG3-ASON, using NHS-MAG3 as a bifunctional chelator. The results revealed that the labeling rate and the stability of 99mTc-MAG3-ASON were evidently higher than that of 99mTc-SHNH-ASON (P < 0.05), the combination rate of 99mTc-MAG3-ASON with plasma albumen was markedly lower than that of 99mTc-SHNH-ASON (P < 0.05); the biodistribution of 99mTc-MAG3-ASON was markedly lower than that of 99mTc-SHNH-ASON in blood, heart, stomach and intestines (P < 0.05), slightly lower than that of 99mTc-SHNH-ASON in liver and spleen (P > 0.05), and markedly higher than that of 99mTc-SHNH-ASON in kidney (P < 0.05); the HT29 cellular uptake rates of 99mTc-MAG3-ASON was markedly higher than that of 99mTc-SHNH-ASON (P < 0.05). Therefore, the radiochemical behavior and biological property of 99mTc-MAG3-ASON labeled using NHS-MAG3 is better than that of 99mTc-SHNH-ASON labeled using SHNH.