Solubilization of a human lymphocyte factor for autorosette

Area of Science:

• Immunology
• Cell Biology

Background:

• Human peripheral blood lymphocytes (PBL) exhibit autorosette (AR) formation.
• Thermal stress significantly affects lymphocyte function.

Purpose of the Study:

• To investigate the effect of heat incubation on PBL autorosette formation.
• To characterize the factor responsible for restoring AR capacity in heated lymphocytes.

Main Methods:

• Incubation of PBL at 45°C.
• Preparation and addition of supernatant from heated lymphocytes (SHL).
• Assay of rosette-forming capacity.
• Characterization of the soluble factor's properties (dilution, absorption, enzymatic sensitivity).

Main Results:

• Incubation at 45°C reduced PBL AR capacity by 80%.
• SHL restored 93% of AR capacity in heated PBL.
• The soluble factor in SHL inhibited non-incubated lymphocytes.
• The factor is heat-stable, RNase/DNase resistant, trypsin/pronase sensitive, and absorbed by autologous but not sheep red blood cells.

Conclusions:

• A heat-induced soluble factor in lymphocyte supernatant can restore thermal-impaired autorosette formation.
• This factor exhibits characteristics suggesting it is a protein.
• The factor demonstrates specific interactions with autologous cells and variable effects on allogeneic cells.