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Title: Single-Cell Measurements of IgE-Mediated FcεRI Signaling Using an Integrated Microfluidic Platform

Journal Article · · PLoS ONE
 [1];  [2];  [1];  [3];  [3];  [2];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States). Biotechnology and Bioengineering Dept.
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Biology and Biophysics Group. Theoretical Division. Center for Nonlinear Studies
  3. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Pathology. Cancer Center

Heterogeneity in responses of cells to a stimulus, such as a pathogen or allergen, can potentially play an important role in deciding the fate of the responding cell population and the overall systemic response. Measuring heterogeneous responses requires tools capable of interrogating individual cells. Cell signaling studies commonly do not have single-cell resolution because of the limitations of techniques used such as Westerns, ELISAs, mass spectrometry, and DNA microarrays. Microfluidics devices are increasingly being used to overcome these limitations. In this paper, we report on a microfluidic platform for cell signaling analysis that combines two orthogonal single-cell measurement technologies: on-chip flow cytometry and optical imaging. The device seamlessly integrates cell culture, stimulation, and preparation with downstream measurements permitting hands-free, automated analysis to minimize experimental variability. The platform was used to interrogate IgE receptor (FcεRI) signaling, which is responsible for triggering allergic reactions, in RBL-2H3 cells. Following on-chip crosslinking of IgE-FcεRI complexes by multivalent antigen, we monitored signaling events including protein phosphorylation, calcium mobilization and the release of inflammatory mediators. The results demonstrate the ability of our platform to produce quantitative measurements on a cell-by-cell basis from just a few hundred cells. Finally, model-based analysis of the Syk phosphorylation data suggests that heterogeneity in Syk phosphorylation can be attributed to protein copy number variations, with the level of Syk phosphorylation being particularly sensitive to the copy number of Lyn.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE; National Inst. of Health (NIH) (United States)
Contributing Organization:
Univ. of New Mexico, Albuquerque, NM (United States)
Grant/Contract Number:
AC52-06NA25396; AC04-94AL85000; P50GM085273
OSTI ID:
1321718
Report Number(s):
LA-UR-12-23884
Journal Information:
PLoS ONE, Vol. 8, Issue 3; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (3)

Microfluidic Platforms for Single-Cell Protein Analysis journal December 2013
Modeling cell line-specific recruitment of signaling proteins to the insulin-like growth factor 1 receptor journal January 2019
Timescale Separation of Positive and Negative Signaling Creates History-Dependent Responses to IgE Receptor Stimulation journal November 2017