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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...

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Related Experiment Video

Updated: Jun 5, 2026

Isolation, Identification, and Purification of Murine Thymic Epithelial Cells

Isolation, Identification, and Purification of Murine Thymic Epithelial Cells

Published on: August 8, 2014

Evidence that androgens modulate human thymic T cell output.

Nancy J Olsen¹, William J Kovacs

¹Division of Rheumatology, Department of Medicine, The Pennsylvania State University, College of Medicine, Milton S. Hershey Medical Center, Hershey, PA 17033-0850, USA.

Journal of Investigative Medicine : the Official Publication of the American Federation for Clinical Research

|January 11, 2011

Summary

Hypogonadism increases thymic T-cell output. Androgen replacement therapy normalizes T-cell production in hypogonadal men, reversing increased thymic output of recent thymic emigrants.

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Published on: October 8, 2012

Area of Science:

Immunology
Endocrinology

Background:

The thymus is a known target of androgenic hormones.
Altered gonadal steroid levels may impact thymic T-cell output.
This study examined thymic cellular output in hypogonadal men receiving androgen replacement therapy.

Purpose of the Study:

To investigate the relationship between hypogonadism and thymic T-cell output.
To assess the effects of androgen replacement therapy on thymic function.

Main Methods:

Quantified circulating naive T cells (CD4+CD45RA+) via flow cytometry.
Measured T-cell receptor excision circles using real-time PCR in peripheral blood mononuclear cells.
Studied healthy men and hypogonadal men before and after testosterone replacement.

Main Results:

Hypogonadal men showed significantly increased proportions of naive T cells (35.5% and 44.4%) compared to healthy males (10.5%).
Testosterone therapy in one patient reduced naive T cells from 37.36% to 12.51% over 7 months.
T-cell receptor excision circle levels decreased by 78% and 83% after androgen replacement in two patients.

Conclusions:

The hypogonadal state is linked to elevated thymic T-cell output.
Androgen replacement therapy effectively reverses the increased thymic output of recent thymic emigrants in hypogonadal men.