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A Semi-automated Approach to Preparing Antibody Cocktails for Immunophenotypic Analysis of Human Peripheral Blood
Published on: February 8, 2016
Antibody-bound cell microarray for immunophenotyping: surface modification and lymphocyte subpopulations
Yasuo Fujii1, James M Anderson, Takehisa Matsuda
1Department of Biomedical Engineering, Graduate School of Medicine, Kyushu University, Higashiku, Fukuoka 812-8582, Japan.
Insights
Antibody microarrays precisely quantify blood cell types for medical diagnosis. This high-throughput method offers reliable immunophenotyping using specific antibodies to cluster of differentiation (CD) antigens.
Area of Science:
- Biomedical Engineering
- Immunology
- Materials Science
Background:
- Antibody-based cell microarrays are crucial for high-throughput diagnostics.
- Precise surface design is essential for biological specificity, reliability, and validity.
- Quantitative immunophenotyping requires robust cell microarray platforms.
Purpose of the Study:
- To quantitatively evaluate immunophenotyping using a cell microarray.
- To assess the specificity and reliability of antibody fixation on microarrays.
- To validate the accuracy of CD4/CD8 subset ratio determination.
Main Methods:
- Fabrication of microarrays using photopatterned self-assembled monolayers of alkanethiols.
- Covalent fixation of anti-CD4 and anti-CD8 antibodies onto carboxylated domains.
- Verification of antibody fixation using confocal laser scanning microscopy and dye staining.
- Validation of cell adhesion specificity using flow cytometry and magnetic bead isolation.
Main Results:
- Microarrays demonstrated precise, high-specificity binding of peripheral blood mononuclear cells expressing CD4 or CD8 antigens.
- Confocal microscopy confirmed near-complete antibody conversion during fixation.
- CD4/CD8 subset ratios determined by microarrays closely matched flow cytometry results.
- The microarray platform exhibited high biological specificity, reliability, and validity.
Conclusions:
- Covalently fixed antibodies on microarrays provide a foundation for high-throughput immunophenotyping.
- This technology supports accurate quantitative evaluation for medical diagnosis.
- The developed microarray technique offers a reliable tool for analyzing blood cell populations.
Abstract:
Antibody-based cell microarrays may serve as a high-throughput diagnostic tool that requires precise surface design providing high biological specificity, high reliability, and high validity. A fundamental study on the quantitative evaluation of immunophenotyping using a cell microarray on which antibodies specific to cluster of differentiation (CD) antigens of blood cells are fixed was performed. The microarray, which was prepared by photomicropatterning self-assembled monolayers of alkanethiols, consisted of carboxyl group (3-mercaptopropionic acid)-packed domains regularly distributed in the methyl group (1-dodecanethiol)-packed matrix phase. This was verified by X-ray photoelectron spectroscopy and water wettability measurements. The patterned carboxylated domains of 1.0 mm or 0.2 mm diameter were covalently fixed with the anti-CD4 or anti-CD8 antibody by coupling reaction using a water-soluble carbodiimide and hydroxysuccinimide. Precision antibody fixation at almost complete conversion was verified by confocal laser scanning microscopy coupled with a specific dye staining technique. Peripheral blood mononuclear cells expressing CD4 or CD8 antigen, respectively, adhered on the anti-CD4 or anti-CD8 antibody-fixed domains of the microarray at a very high specificity, which was verified with flow cytometric analysis and an antibody-coated magnetic-bead-based cell isolation technique. The CD4/CD8 subset ratios determined using the antibody-fixed microarrays were very close to those obtained by flow cytometric analysis. These results indicate that microarrays, on which antibodies specific to cell surface antigens are covalently fixed, provide a solid basis of the high-throughput quantitative evaluation of immunophenotyping in medical diagnosis.
