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Updated: Jul 13, 2026
Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
Published on: April 16, 2015
Proximal signaling control of human effector CD4 T cell function
Francesca I Okoye1, Sandeep Krishnan, Meena R Chandok
1Division of Transplantation, Department of Surgery, University of Maryland School of Medicine, MSTF Building, Room 400, Baltimore, MD 21201, USA.
Abstract:
The functional coupling of T cell receptor (TCR)-mediated signaling events in primary human T cells remains undefined. We demonstrate here that alterations in the expression of proximal TCR-coupled signaling subunits are associated with distinct effector capacities in differentiated human CD4 T cells. Analysis of proximal signaling profiles using biochemical and single cell approaches reveals decreased CD3zeta and ZAP-70 expression correlating with functional anergy, with increased CD3zeta/ ZAP-70 expression and phosphorylation connoting acquisition of effector capacity. By contrast, the FcRgamma signaling subunit known to be expressed in human effector cells and in T cells from the autoimmune disease SLE is up-regulated upon activation, yet does not correlate with functional capacity in effector cells, and does not alter signaling or function in primary FcRgamma transfectants. Our results have implications for targeting signaling molecules in immunotherapy and evaluating the functional consequence of signaling alterations associated with autoimmunity and chronic diseases.
Insights
Altered expression of T cell receptor (TCR) signaling proteins CD3zeta and ZAP-70 impacts human T cell function. Increased levels correlate with effector capacity, while decreased levels lead to anergy.
Area of Science:
- Immunology
- Cellular Signaling
- Molecular Biology
Background:
- The precise mechanisms linking T cell receptor (TCR) signaling to T cell function in humans are not fully understood.
- Understanding these pathways is crucial for developing targeted immunotherapies and understanding diseases.
Purpose of the Study:
- To investigate the relationship between proximal TCR signaling subunit expression and effector functions in human CD4 T cells.
- To determine the role of FcRgamma in human T cell activation and function.
Main Methods:
- Biochemical assays and single-cell analysis were used to profile proximal TCR signaling subunits.
- Expression and phosphorylation levels of CD3zeta, ZAP-70, and FcRgamma were analyzed.
- Functional capacity and signaling alterations were assessed in primary human T cells and FcRgamma transfectants.
Main Results:
- Decreased expression of CD3zeta and ZAP-70 correlated with functional anergy in differentiated human CD4 T cells.
- Increased CD3zeta and ZAP-70 expression and phosphorylation were associated with the acquisition of effector capacity.
- FcRgamma was upregulated upon activation but did not correlate with effector cell functional capacity.
Conclusions:
- Proximal TCR signaling subunit expression, particularly CD3zeta and ZAP-70, is a key determinant of human CD4 T cell effector function.
- FcRgamma's role in human T cell effector function appears distinct from CD3zeta and ZAP-70.
- These findings have implications for immunotherapy and understanding signaling alterations in autoimmune and chronic diseases.
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