Characterization of the spreading process in human T lymphocytes

Area of Science:

• Immunology
• Cell Biology
• Biochemistry

Background:

• Human T lymphocytes are crucial immune cells.
• Cell adhesion and spreading are fundamental processes in cell biology.
• Concanavalin A (conA) is a lectin known to bind carbohydrates on cell surfaces.

Purpose of the Study:

• To investigate the effect of substratum-bound concanavalin A (conA) on human T lymphocyte attachment and spreading.
• To determine the influence of conA concentration and preincubation on T lymphocyte morphology.
• To elucidate the morphological sequence of T lymphocyte spreading induced by conA.

Main Methods:

• Human T lymphocytes were identified using monoclonal anti-T cell antibodies and sheep erythrocyte rosette formation.
• Cells were exposed to varying concentrations of conA, either bound to the substratum or in the medium.
• Morphological changes, including filopodia and lamellipodia formation, were observed using microscopy.

Main Results:

• Substratum-bound conA induced T lymphocyte attachment and spreading.
• Higher conA concentrations led to more pronounced spreading, with filopodia and lamellipodia formation.
• Preincubation with conA inhibited spreading, while simultaneous presence in the medium enhanced it.
• Spreading involved filopodia formation followed by lamellipodia development and cell flattening, with microvilli disappearance.

Conclusions:

• Concanavalin A is a potent inducer of T lymphocyte spreading.
• The method of conA application (bound vs. medium) significantly impacts T lymphocyte morphology.
• ConA-induced T lymphocyte spreading follows a defined sequence of morphological alterations, regardless of cell activation state.