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A synaptic basis for T-lymphocyte activation.

Annales D'Immunologie

|September 1, 1984

Summary

T lymphocytes form specialized junctions with antigen-presenting cells, similar to nervous system communication. This model explains T-cell activation via receptor clustering and ion channel formation, suggesting a shared evolutionary origin with neuronal signaling.

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Area of Science:

Immunology
Neuroscience
Cell Biology

Background:

T lymphocytes interact with antigen-presenting cells (APCs) through specialized junctions for immune recognition and activation.
The T-cell receptor (TcR) and Ia molecules are key players in this recognition process.
Similarities exist between T-cell activation and cell communication in other systems, notably the nervous system.

Purpose of the Study:

To present a hypothesis and model for T-cell recognition and activation.
To illustrate the parallels between T-cell communication and neuronal signaling.
To propose an evolutionary link between lymphoid and neuronal cell interactions.

Main Methods:

A model of T-cell activation is proposed based on existing data and structural predictions.
The model details the sequential steps of T-cell receptor (TcR) and Ia interaction, adhesion molecule binding, and cluster formation.
The role of T3 membrane molecules in forming an ion channel and activating the T cell is described.

Main Results:

The T-cell receptor (TcR) interacts with Ia and antigen on APCs, initiating cell-cell contact.
Adhesion molecules like L3/T4 concentrate interacting proteins at the junction.
TcR-Ia-antigen complexes form clusters, leading to T3-mediated ion channel formation and T-cell stimulation.
MHC molecules also cluster on APCs, potentially activating the presenting cell.
Secretory products are released into the synaptic site for directed communication.

Conclusions:

The proposed model provides a framework for understanding T-cell activation as a process involving receptor clustering and ion channel formation.
The analogy highlights the functional similarities between T-cell recognition and neuronal communication.
This perspective suggests that neuronal and lymphoid cell interactions may share a common evolutionary origin from primordial cell communication mechanisms.

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