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Tantalum Oxide Nanoparticle-Based Mass Tag for Mass Cytometry.

Authors :
Zhang Y
Zabinyakov N
Majonis D
Bouzekri A
Ornatsky O
Baranov V
Winnik MA
Source :
Analytical chemistry [Anal Chem] 2020 Apr 21; Vol. 92 (8), pp. 5741-5749. Date of Electronic Publication: 2020 Apr 02.
Publication Year :
2020

Abstract

Mass cytometry (MC) is a bioanalytical technique that uses metal-tagged antibodies (Abs) for high-dimensional single-cell immunoassays. Currently, this technology can measure over 40 parameters simultaneously on individual cells using metal-chelating polymer (MCP) based reagents. However, MC can in principle detect up to 135 parameters with the development of new elemental mass tags. Here we report the development of a tantalum oxide nanoparticle (NP)-based mass tag for MC immunoassays. Uniform-sized amine-functionalized tantalum oxide NPs ( d ∼ 5.7 nm) were synthesized via a one-pot two-step reverse microemulsion method. These amine-functionalized NPs were further modified with azide groups by reacting with azide-PEG <subscript>2 k </subscript> succinimidyl carboxymethyl ester (NHS-PEG <subscript>2 k </subscript> -N <subscript>3</subscript> ) cross-linkers. The Ab-NP conjugates were prepared by reacting azide-functionalized NPs with dibenzocyclooctyne (DBCO)-functionalized primary or secondary Abs (DBCO-Ab) followed by fast protein size exclusion liquid chromatography (FPLC) purification. Three Ab-NP conjugates (TaO <subscript>2</subscript> -PEG <subscript>2 k </subscript> -goat antimouse, TaO <subscript>2</subscript> -PEG <subscript>2 k </subscript> -CD25, TaO <subscript>2</subscript> -PEG <subscript>2 k </subscript> -CD196) were fabricated and tested in MC immunoassays. For the TaO <subscript>2</subscript> -PEG <subscript>2 k </subscript> -goat antimouse conjugate, we showed that it can effectively detect abundant CD20 biomarkers on Ramos cells. For TaO <subscript>2</subscript> -PEG <subscript>2 k </subscript> -CD25 and TaO <subscript>2</subscript> -PEG <subscript>2 k </subscript> -CD196 conjugates, we demonstrated that these Ab-NP conjugates could be integrated into the commercial Ab staining panels for high-dimensional single-cell immune profiling of human peripheral blood mononuclear cells.

Details

Language :
English
ISSN :
1520-6882
Volume :
92
Issue :
8
Database :
MEDLINE
Journal :
Analytical chemistry
Publication Type :
Academic Journal
Accession number :
32239915
Full Text :
https://doi.org/10.1021/acs.analchem.9b04970