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Clin Chim Acta. 2015 Aug 25;448:118-23. doi: 10.1016/j.cca.2015.05.022. Epub 2015 Jun 18.

Quantitative assessment of human serum transferrin receptor in breast cancer patients pre- and post-chemotherapy using peptide immunoaffinity enrichment coupled with targeted proteomics.

Author information

1
Nanjing Medical University, Nanjing, 211166, China.
2
Jiangsu Cancer Hospital, Nanjing, China.
3
First Affiliated Hospital of Nanjing Medical University, Nanjing, 210006, China.
4
Nanjing Medical University, Nanjing, 211166, China. Electronic address: ychen@njmu.edu.cn.

Abstract

BACKGROUND:

sTfR, a soluble form of transferrin receptor in serum, has been suggested as an indicator of bone marrow failure in breast cancer patients receiving chemotherapy. However, intensive chemotherapy could also cause a reduction of sTfR to a level below the LOQ of most assays.

METHODS:

An advanced liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based targeted proteomics assay coupled with peptide immunoaffinity enrichment (SISCAPA) was developed and validated for monitoring sTfR.

RESULTS:

Tryptic peptide 681VEYHFLSPYVSPK693 was selected as a surrogate analyte for quantification. High-abundant proteins were first removed from serum, followed by SISCAPA that was effective in surrogate peptide enrichment and sensitivity enhancement. The resulting LOQ can achieve 100ng/ml (~10-fold increase). Then, sTfR levels in breast cancer patients pre- and post-chemotherapy, and healthy volunteers were accurately quantified as 1.77±0.53μg/ml, 0.98±0.26μg/ml and 1.66±0.50μg/ml, respectively, using a standard addition method. While there was no evidence for a difference between patients and healthy volunteers, differential levels of sTfR pre- and post-chemotherapy were obtained. Comparison between SISCAPA-targeted proteomics and ELISA indicated that the former approach provided a lower value of sTfR.

CONCLUSIONS:

SISCAPA-targeted proteomics may allow the quantification of low-abundant proteins in a more accurate manner.

KEYWORDS:

Breast cancer; Chemotherapy; Liquid chromatography-tandem mass spectrometry; SISCAPA; Serum transferrin receptor; Targeted proteomics

PMID:
26096257
DOI:
10.1016/j.cca.2015.05.022
[Indexed for MEDLINE]

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