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T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...

T Cell Types and Functions

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...

Cell-mediated Immune Responses

Cell-mediated Immune Responses

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Related Experiment Video

Updated: Sep 9, 2025

Mesenchymal Stem Cell Regulation of Macrophage Phagocytosis; Quantitation and Imaging

Mesenchymal Stem Cell Regulation of Macrophage Phagocytosis; Quantitation and Imaging

Published on: July 16, 2021

Macrophage-T Cell Physical Interaction Modulates IFN-γ Secretion.

Kolade Adebowale^1,2, Zerin Mahzabin Khan^1,3, Daniel E Michaud^4,5

¹School of Engineering & Applied Sciences, Harvard University, Allston, Massachusetts 02134, United States.

ACS Applied Materials & Interfaces

|September 1, 2025

Summary

This summary is machine-generated.

Physical contact between macrophages and T cells enhances immune responses. This interaction boosts interferon-gamma (IFN-γ) secretion and PD-L1 expression, crucial for T cell activity and cancer immunity.

Keywords:

T cell cell therapy immunophenotype macrophage

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Area of Science:

Immunology
Cell Biology
Biomaterials Science

Background:

Macrophages and T cells communicate through biochemical and physical interactions.
Proximity of macrophages and T cells is linked to cancer outcomes, suggesting physical contact influences cell behavior.
Systematic investigation into the role of physical contact between these immune cells is lacking.

Purpose of the Study:

To investigate the role of physical contact between naïve macrophages and activated CD8+ T cells.
To develop 3D coculture models to study cell-cell interactions.
To understand how physical interactions modulate immune cell phenotype and activity.

Main Methods:

Developed three-dimensional (3D) coculture assays using Matrigel.
Compared direct contact conditions with separated (Transwell) conditions.
Quantified T cell migration and measured cytokine secretion (IFN-γ) and cell surface marker expression (ICAM-1, PD-L1).

Main Results:

T cells exhibited altered migration, stopping and interacting with macrophages.
Physical contact led to a 3-fold increase in IFN-γ secretion.
Contact induced a 2-fold upregulation of ICAM-1 and increased PD-L1 expression, mediated by JAK signaling.

Conclusions:

Physical contact between macrophages and T cells is a critical determinant of their function.
Activated T cells engage with macrophages, increasing IFN-γ and PD-L1 production.
3D biomaterial models can provide mechanistic insights into cell interactions for immune response manipulation.