T-cell hybridomas producing hapten-specific suppressor factors.

Area of Science:

• Immunology
• Molecular Biology
• Genetics

Background:

• T-T hybridomas can secrete soluble factors that modulate immune responses.
• Suppressor factors play a critical role in regulating antibody production.
• The I-J region of the major histocompatibility complex is involved in immune regulation.

Purpose of the Study:

• To characterize soluble suppressor factors produced by T-T hybridomas.
• To investigate the antigen specificity and genetic basis of these suppressor factors.
• To elucidate the role of I-J determinants in suppressor factor structure and function.

Main Methods:

• Generation of T-T hybridomas secreting antigen-specific suppressor factors.
• Assays to measure in vitro antibody response suppression.
• Analysis of factor binding specificity to nitrophenol (NP).
• Immunogenetic analysis to identify I-J determinants and immunoglobulin cross-reactivity.

Main Results:

• Hybridomas secreted factors suppressing antibody response to NP but not other antigens.
• Suppressor factors specifically bound NP and expressed I-J determinants.
• No cross-reactivity with constant regions of mouse immunoglobulins was detected.
• Sub-clones exhibited distinct I-J determinant profiles, correlating with cell membrane expression.

Conclusions:

• Soluble suppressor factors are antigen-specific and carry I-J determinants.
• The structure of suppressor factors is influenced by at least two genes.
• These findings provide insights into the genetic control of immune suppression and T-cell regulation.