Immunological comparison of basic encephalitogen and histone F2A1.

Area of Science:

• Immunology
• Protein Chemistry

Background:

• Basic encephalitogen and histone F2A1 are proteins with potential immunological relevance.
• Understanding cross-reactivity between these proteins is crucial for immunological studies.

Purpose of the Study:

• To establish the extent of immunological cross-reaction between basic encephalitogen and histone F2A1.
• To differentiate between humoral and cellular levels of cross-reactivity.

Main Methods:

• Humoral cross-reactivity assessed via complement fixation, inhibition of complement fixation, radioimmunoassay, and passive cutaneous anaphylaxis.
• Cellular cross-reactivity evaluated using lymphocyte stimulation, inhibition of lymphocyte stimulation, and delayed hypersensitivity skin reactions in rabbits and guinea pigs.

Main Results:

• No significant immunological cross-reaction was detected at the humoral antibody level.
• A slight but significant cross-reaction was observed at the cellular level, particularly via inhibition of lymphocyte stimulation and delayed hypersensitivity tests.

Conclusions:

• Immunological studies indicate limited evidence of shared antigenic determinants between basic encephalitogen and histone F2A1.
• The findings suggest distinct immunological profiles at humoral versus cellular levels for these proteins.