检验医学 ›› 2012, Vol. 27 ›› Issue (3): 185-188.

• 生物化学检验论著 • 上一篇    下一篇

毛细管电泳与MALDI-TOF/MS联用测定血清转甲状腺素蛋白的化学修饰

张文亮   

  1. 1.天津医科大学,天津 300700;2.天津大学药学科学与工程技术学院,天津 300072;3.天津医科大学第二医院检验科,天津 300211
  • 收稿日期:2012-01-09 出版日期:2012-03-30 发布日期:2012-03-16
  • 作者简介:张文亮,男,1973年生,学士,副主任技师,主要从事免疫学检验。

The determination of serum transthyretin chemical modification by capillary electrophoresis combined with MALDI-TOF/MS analysis

  1. 1. Tianjin Medical University, Tianjin 300700, China; 2. School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China; 3. Department of Clinical Laboratory, the Second Hospital of Tianjin Medical University, Tianjin 300211, China
  • Received:2012-01-09 Online:2012-03-30 Published:2012-03-16

摘要: 目的 建立一种毛细管电泳(CE)与基质辅助激光解吸/电离飞行时间质谱 (MALDI-TOF/MS) 联用测定血清转甲状腺素蛋白(TTR)化学修饰的方法。方法 用酶联免疫吸附法(ELISA)测定20例老年性淀粉样变(SSA)患者及20名健康体检者血清TTR浓度; CE法分离血清TTR并利用MALDI-TOF/MS测定TTR的化学修饰。结果 健康对照组及SSA组血清TTR浓度分别为0.25±0.04、(0.26±0.03)g/L,2组间差异无统计学意义(P>0.05);MALDI-TOF/MS分析共发现4个TTR化学修饰峰,质/荷比(m/z)分别为:13 750.86±1.48、13 830.63±2.76、13 871.70±2.70、13 919.00±14.77;分别对应未修饰-TTR、磺化-TTR、半胱氨酸-TTR和半胱氨酸甘氨酸-TTR。结论 CE法分离血清TTR能够直接利用MALDI-TOF/MS测定其化学修饰,可用于临床检测血清TTR的化学修饰。

关键词: 转甲状腺素蛋白, 毛细管电泳, 质谱, 化学修饰

Abstract: Objective To establish a combined method for analysis of serum transthyretin(TTR) chemical modification using capillary electrophoresis (CE) with matrixassisted laser desorption ionizationtimeofflight mass spectrometry (MALDI-TOF/MS) analysis. Methods Enzymelinked immunosorbent assay (ELISA) was used to determine serum TTR in 20 senile systemic amyloidosis (SSA) patients and 20 healthy subjects. Serum TTR was separated by CE. Determination of TTR chemical modification was analyzed by MALDI-TOF/MS. Results The levels of serum TTR was (0.25±0.04)g/L in control group and (0.26±0.03)g/L in SSA patients, and there was no significant difference between control group and SSA patients(P>0.05). The chemical modification of TTR found 4 TTR chemical modification peaks, as native-TTR [masstocharge ratio (m/z): 13 750.86±1.48], sul-TTR (m/z ratio: 13 830.63±2.76), cys-TTR (m/z ratio: 13 871.70±2.70) and cysgly-TTR (m/z ratio: 13 919.00±14.77) by MALDI-TOF/MS analysis. Conclusions The combined method of CE with MALDI-TOF/MS analysis can be used directly to determine the chemical modification of TTR.

Key words: Transthyretin, Capillary electrophoresis, Mass spectrometry, Chemical modification