Anti-HL-A7 lymphocyte-dependent antibody.

Area of Science:

• Immunology
• Cellular Biology
• Transplantation Immunology

Background:

• Human cytotoxic lymphocyte-dependent antiserum mediates cell lysis.
• The specificity of this antiserum for target cells is not fully understood.
• Human Leukocyte Antigen (HLA) system plays a critical role in immune recognition.

Purpose of the Study:

• To determine the target cell specificity of a human cytotoxic lymphocyte-dependent antiserum.
• To investigate the correlation between the presence of the HL-A7 antigen and antibody-mediated cell damage.

Main Methods:

• In vitro incubation of target cells from HL-A7-positive and HL-A7-negative donors with the antiserum and normal lymphocytes.
• Assessment of target cell damage.
• Adsorption experiments using lymphocytes from HL-A7-positive and HL-A7-negative donors to remove cytotoxic activity from the antiserum.

Main Results:

• Target cells from 10 of 11 HL-A7-positive donors were damaged.
• Target cells from six HL-A7-negative donors were not damaged.
• Cytotoxic activity was abolished by adsorption with HL-A7-positive lymphocytes but not with HL-A7-negative lymphocytes.

Conclusions:

• The specificity of the human cytotoxic lymphocyte-dependent antiserum is directly correlated with the presence of the HL-A7 antigen on target cells.
• This suggests that HL-A7 is a critical determinant for the recognition and lysis of target cells by this antiserum.