Tracking a New Cell-Penetrating (W/R) Nonapeptide, through an Enzyme-Stable Mass Spectrometry Reporter Tag
作者:Diane Delaroche、Baptiste Aussedat、Soline Aubry、Gérard Chassaing、Fabienne Burlina、Gilles Clodic、Gérard Bolbach、Solange Lavielle、Sandrine Sagan
DOI:10.1021/ac061108l
日期:2007.3.1
We have designed a mass stable reporter (msr) tag with m/z over 500, trifluoroacetyl(α,α-diethyl)Gly-Lys(Nεbiotin)-(D)Lys-Cys, for the quantification of the uptake and study of the degradation processes of cell-penetrating peptides (CPP), by matrix assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. This tag was found stable in cell lysis conditions. Using a quantitative MALDI-TOF mass spectrometry analysis based method, an accurate tracking of a new CPP and of its degradation products could be done. (1) The new msr(W/R) nonapeptide (H-RRWWRRWRR−NH2) enters chinese hamster ovary (CHO) K1 cells with a kinetic reaching a steady state after 30−60 min of incubation. This plateau was stable for 4 h and decreased slowly afterward. (2) The peptide msr(W/R) nonapeptide was not cytotoxic over 48 h incubation with CHO cells. (3) After 1 h incubation, the msr(W/R) nonapeptide accumulated with a 3-fold higher concentration than the extracellularly added concentration (7.5 μM). (4) The intracellular quantification was accurate with less than 3% of the quantified peptide being potentially membrane-bound. (5) There was no leakage of the full-length CPP outside the cells. And, finally, (6) analysis of the degradation process of this new CPP suggests that the peptide did not traffick to lyso-somes.
我们设计了 m/z 超过 500 的质量稳定报告基因 (msr) 标签,三氟乙酰基 (α,α-二乙基)Gly-Lys(Nεbiotin)-(D)Lys-Cys,用于定量摄取和研究通过基质辅助激光解吸/电离飞行时间 (MALDI-TOF) 质谱分析细胞穿透肽 (CPP) 的降解过程。发现该标签在细胞裂解条件下稳定。使用基于定量 MALDI-TOF 质谱分析的方法,可以准确跟踪新的 CPP 及其降解产物。 (1) 新的 msr(W/R) 九肽 (H-RRWWRRWRR−NH2) 进入中国仓鼠卵巢 (CHO) K1 细胞,孵育 30−60 分钟后动力学达到稳定状态。该平台稳定了 4 小时,然后缓慢下降。 (2) 肽 msr(W/R) 九肽在与 CHO 细胞孵育 48 小时后没有细胞毒性。 (3)孵育1小时后,msr(W/R)九肽的累积浓度是细胞外添加浓度(7.5μM)的3倍。 (4) 细胞内定量准确,定量肽中潜在膜结合率低于 3%。 (5)全长CPP没有渗漏到细胞外。最后,(6) 对这种新 CPP 降解过程的分析表明,该肽没有运输到溶酶体。