Abstract:Secreted proteins are critical mediators in various biological systems, including the immune system, nervous system, and tumor microenvironment. Understanding profound cellular functional heterogeneity in secretion requires multiplexed secreted protein analysis at the single‐cell level. However, most single‐cell protein secretion analysis technologies rely on bulky, expensive instruments, preventing widespread use. Herein, we proposed using a portable and low‐cost desktop scanner to detect multiplexed proteins… Show more
“…Once single cells are isolated and captured, various analytical methods can be selected for single‐cell determination and characterization, including immunoassays, fluorescence techniques, imaging, flow cytometry, single‐cell sequencing, mass spectrometry (MS), etc. [ 27–31 ] For instance, proteins secreted from a single cell can be bound to a microarray by primary antibodies and then detected with secondary antibodies labeled with fluorescent markers. [ 32 ] However, antibody‐based immunoassays rely on high‐quality antibodies and are limited in throughout.…”
Population‐level analysis masks significant heterogeneity between individual cells, making it difficult to accurately reflect the true intricacies of life activities. Microfluidics is a technique that can manipulate individual cells effectively and is commonly coupled with a variety of analytical methods for single‐cell analysis. Single‐cell omics provides abundant molecular information at the single‐cell level, fundamentally revealing differences in cell types and biological states among cell individuals, leading to a deeper understanding of cellular phenotypes and life activities. Herein, this work summarizes the microfluidic chips designed for single‐cell isolation, manipulation, trapping, screening, and sorting, including droplet microfluidic chips, microwell arrays, hydrodynamic microfluidic chips, and microchips with microvalves. This work further reviews the studies on single‐cell proteomics, metabolomics, lipidomics, and multi‐omics based on microfluidics and mass spectrometry. Finally, the challenges and future application of single‐cell multi‐omics are discussed.
“…Once single cells are isolated and captured, various analytical methods can be selected for single‐cell determination and characterization, including immunoassays, fluorescence techniques, imaging, flow cytometry, single‐cell sequencing, mass spectrometry (MS), etc. [ 27–31 ] For instance, proteins secreted from a single cell can be bound to a microarray by primary antibodies and then detected with secondary antibodies labeled with fluorescent markers. [ 32 ] However, antibody‐based immunoassays rely on high‐quality antibodies and are limited in throughout.…”
Population‐level analysis masks significant heterogeneity between individual cells, making it difficult to accurately reflect the true intricacies of life activities. Microfluidics is a technique that can manipulate individual cells effectively and is commonly coupled with a variety of analytical methods for single‐cell analysis. Single‐cell omics provides abundant molecular information at the single‐cell level, fundamentally revealing differences in cell types and biological states among cell individuals, leading to a deeper understanding of cellular phenotypes and life activities. Herein, this work summarizes the microfluidic chips designed for single‐cell isolation, manipulation, trapping, screening, and sorting, including droplet microfluidic chips, microwell arrays, hydrodynamic microfluidic chips, and microchips with microvalves. This work further reviews the studies on single‐cell proteomics, metabolomics, lipidomics, and multi‐omics based on microfluidics and mass spectrometry. Finally, the challenges and future application of single‐cell multi‐omics are discussed.
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