Absolute quantification of tumor antigens using embedded MHC-I isotopologue calibrants.

Absolute quantification of tumor antigens using embedded MHC-I isotopologue calibrants.
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DOI:
10.1073/pnas.2111173118
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发表时间:
2021-09-14
影响因子:
11.1
通讯作者:
White FM
White FM
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Stopfer LE;Gajadhar AS;Patel B;Gallien S;Frederick DT;Boland GM;Sullivan RJ;White FM

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肽主要组织相容性复合体(pMHC)抗原的绝对定量测量(每个细胞的拷贝数)对于告知靶向免疫治疗药物设计是必要的;然而,现有的绝对定量方法存在严重的局限性。在这里,我们提出了一个名为SureQuant-IsoMHC的平台,利用一系列pMHC同位素和内部标准触发的靶向质谱法来生成嵌入的多点校准曲线,以确定18种肿瘤抗原的内源性pMHC浓度。我们应用SureQuant-IsoMHC来测量MEK抑制剂处理的黑色素瘤细胞系中靶蛋白表达的变化,并将这种方法用于估计黑色素瘤肿瘤活检中的抗原浓度。
Absolute quantification measurements (copies per cell) of peptide major histocompatibility complex (pMHC) antigens are necessary to inform targeted immunotherapy drug design; however, existing methods for absolute quantification have critical limitations. Here, we present a platform termed SureQuant-IsoMHC, utilizing a series of pMHC isotopologues and internal standard-triggered targeted mass spectrometry to generate an embedded multipoint calibration curve to determine endogenous pMHC concentrations for a panel of 18 tumor antigens. We apply SureQuant-IsoMHC to measure changes in expression of our target panel in a melanoma cell line treated with a MEK inhibitor and translate this approach to estimate antigen concentrations in melanoma tumor biopsies.
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