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12:59
Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
Published on: September 26, 2013
Genetically determined lymphopenia and autoimmune manifestations
Anna Villa1, Veronica Marrella, Francesca Rucci
1Istituto Tecnologie Biomediche, Consiglio Nazionale delle Ricerche, San Raffaele Telethon Institute for Gene Therapy, Milan, Italy. anna.villa@itb.cnr.it
Current Opinion in Immunology
|April 12, 2008
Summary
Defects in V(D)J recombination cause low T cell counts, leading to altered immune tolerance. This allows self-reactive T cells to expand, resulting in autoimmune diseases in humans and mice.
Area of Science:
- Immunology
- Genetics
- Autoimmunity
Background:
- Hypomorphic V(D)J recombination defects result in limited T cell development.
- Lymphopenic conditions trigger homeostatic lymphocyte proliferation.
- Mechanisms maintaining host tolerance are disrupted in lymphopenia.
Purpose of the Study:
- To review human and murine models of genetically determined T and B cell lymphopenia.
- To explore the association between lymphopenia and autoimmune manifestations.
- To understand the role of altered immune tolerance in lymphopenic conditions.
Main Methods:
- Review of human case studies.
- Analysis of murine models of V(D)J recombination defects.
- Examination of immune tolerance mechanisms in lymphopenic states.
Main Results:
- Residual T cell development occurs despite V(D)J recombination defects.
- Oligoclonal and autoreactive T cells expand peripherally in lymphopenic hosts.
- Genetically determined T and B cell lymphopenia is linked to autoimmune conditions.
Conclusions:
- Altered immune tolerance in lymphopenic settings facilitates the expansion of autoreactive T cells.
- Both human and murine data indicate a connection between lymphopenia and autoimmunity.
- Understanding these mechanisms is crucial for addressing autoimmune manifestations in primary immunodeficiencies.
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