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Immunodeficiency Diseases

Immunodeficiency Diseases

Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...

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...

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.
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Cytotoxic T Cells-mediated Immune Response

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.
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Cell-mediated Immune Responses

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Type I Diabetes II: Pathophysiology

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Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...

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Related Experiment Video

Updated: Jul 2, 2026

Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses

Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8⁺ T Cell Responses

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T cell immunodeficiency.

¹David M Edgar, Royal Hospitals, The Belfast Trust, Grosvenor Road, Belfast BT12 6BN, UK. david.edgar@belfasttrust.hscni.net

Journal of Clinical Pathology

|August 30, 2008

Summary

This summary is machine-generated.

Early recognition of T cell immunodeficiency is crucial for infants, as prompt diagnosis and intervention, such as bone marrow transplantation, can prevent severe infections. Laboratory clinicians play a key role in identifying these rare primary disorders.

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Area of Science:

Immunology
Pediatrics
Hematology

Background:

T cell immunodeficiency encompasses primary genetic disorders and secondary deficiencies acquired through infection, illness, or medication.
Primary T cell disorders are rare, comprising about 11% of primary immunodeficiencies, typically manifesting in infancy or early childhood.
Secondary T cell deficiency is a hallmark of HIV infection, increasing susceptibility to various pathogens.

Purpose of the Study:

To highlight the importance of early recognition and diagnosis of T cell immunodeficiency in infants.
To emphasize the diagnostic role of laboratory clinicians in identifying rare primary immunodeficiencies.
To underscore the association between T cell deficiency and susceptibility to opportunistic infections.

Main Methods:

Review of clinical presentations and laboratory findings associated with T cell immunodeficiency.
Analysis of the epidemiological data on primary immunodeficiencies.
Clinical case discussions focusing on diagnostic challenges and management strategies.

Main Results:

Primary T cell disorders are rare but require timely intervention, often bone marrow transplantation, to avoid severe complications.
Laboratory-based clinicians are vital for identifying these conditions due to their rarity and atypical presentations.
Patients with T cell immunodeficiency exhibit increased susceptibility to unusual or severe viral, fungal, and protozoal infections.

Conclusions:

Prompt diagnosis of T cell immunodeficiency in infants is critical for effective management and improved outcomes.
Laboratory diagnostics and clinical expertise are essential for recognizing T cell disorders.
Consideration of T cell immunodeficiency is warranted in patients with severe or unusual infections, particularly in the context of HIV.