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[Cell interaction in immune response]
Vestnik Rossiiskoi Akademii Meditsinskikh Nauk
|June 23, 1999
Summary
T- and B-lymphocyte activation requires antigen recognition plus costimulation signals from cell surface molecules. Without costimulation, lymphocytes become anergic or undergo apoptosis, highlighting its critical role in immunity and potential therapeutic applications.
Area of Science:
- Immunology
- Molecular Biology
- Cell Signaling
Context:
- Immune responses are initiated by antigen recognition via T- and B-lymphocytic receptors.
- Lymphocyte activation necessitates a secondary signal, known as costimulation, in addition to antigen recognition.
- Costimulation signals primarily originate from the interaction between lymphocyte surface molecules and accessory cells.
Purpose:
- To elucidate the critical role of costimulation in lymphocyte activation.
- To highlight the molecular interactions central to T-helper and B-cell activation.
- To underscore the consequences of absent or defective costimulation in immune function.
Summary:
- The interaction between CD28 on T-cells and CD80/CD86 on antigen-presenting cells is crucial for T-helper cell activation.
- The CD40-CD154 interaction is key for B-cell activation.
- Absence of costimulation leads to lymphocyte anergy or apoptosis, and defects can cause immunodeficiencies like hyper-IgM syndrome.
Impact:
- Defects in costimulatory molecule expression or function can lead to significant immunodeficiencies.
- Understanding costimulation pathways is vital for diagnosing and potentially treating immune disorders.
- Soluble forms of costimulatory molecules represent potential therapeutic agents for immunomodulation.