Related Experiment Video

Updated: Aug 7, 2026

Phenotypic and Functional Analysis of Activated Regulatory T Cells Isolated from Chronic Lymphocytic Choriomeningitis Virus-infected Mice
07:17

Phenotypic and Functional Analysis of Activated Regulatory T Cells Isolated from Chronic Lymphocytic Choriomeningitis Virus-infected Mice

Published on: June 22, 2016

Activated and memory CD8+ T cells can be distinguished by their cytokine profiles and phenotypic markers

M K Slifka1, J L Whitton

  • 1Department of Neuropharmacology, The Scripps Research Institute, La Jolla, CA 92037, USA. mslifka@scripps.edu

Journal of Immunology (Baltimore, Md. : 1950)
|December 22, 1999
PubMed

Insights

Activated and memory T cells exhibit distinct cytokine production patterns and surface marker expression. Memory T cells show similar on/off cytokine regulation as activated T cells but can be differentiated by their unique profiles.

Area of Science:

  • Immunology
  • Cellular Immunology
  • T cell biology

Background:

  • Distinguishing activated from memory T lymphocytes is crucial for understanding T cell-mediated immunity.
  • Identifying functional characteristics and surface markers is key to this differentiation.

Purpose of the Study:

  • To compare cytokine production rates in virus-specific primary and memory CD8+ T cells ex vivo.
  • To identify surface markers that differentiate activated from memory T cells.

Main Methods:

  • Direct ex vivo comparison of cytokine (IFN-gamma, TNF-alpha) production by primary and memory CD8+ T cells.
  • Analysis of T cell surface markers including CD8, LFA-1, and CTLA-4.
  • Assessment of cytokine production kinetics and re-initiation upon antigen re-exposure.

Main Results:

  • Both T cell types produced cytokines within 60 minutes of stimulation, with similar on-rate kinetics.
  • Activated T cells produced more IFN-gamma and less TNF-alpha than memory T cells.
  • Cytokine production required continuous antigen stimulation; memory T cells showed varied re-initiation upon re-exposure.
  • Distinct cytokine profiles and differential expression of CD8, LFA-1, and CTLA-4 distinguished activated from memory T cells.
  • CTLA-4 expression peaked early in the immune response and declined post-viral clearance.

Conclusions:

  • Memory T cells exhibit antigen-specific on/off cytokine production regulation, similar to activated T cells.
  • Memory T cells can be discriminated from activated T cells ex vivo by cytokine profiles and differential expression of CD8, LFA-1, and CTLA-4.
  • This study provides novel insights into T cell memory and activation states.

More Related Videos

Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry10:58

Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry

Published on: March 5, 2019

Isolation, Cultivation, and Transient Transfection of Primary Human T Cells to Generate Chimeric Antigen Receptor (CAR) T Cells08:33

Isolation, Cultivation, and Transient Transfection of Primary Human T Cells to Generate Chimeric Antigen Receptor (CAR) T Cells

Published on: March 27, 2026

Related Concept Videos

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
T Cell Activation and Clonal Selection01:22

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 Functions01:24

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...
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...