Adaptive Immunity

Adaptive immunity involves antigen-specific responses mediated by B lymphocytes, antibodies, and T lymphocytes.

B cells can differentiate into antibody-producing plasma cells following appropriate immune activation. Antibodies directed against a therapeutic vector may interfere with its interaction with target cells or reduce its effective availability. The magnitude and consequences of these effects depend on the antibody's specificity, concentration, and functional properties.

T cells contribute through several mechanisms. CD4-positive helper T cells coordinate immune responses, while CD8-positive cytotoxic T cells may recognize and eliminate cells displaying specific antigen-derived peptides on major histocompatibility complex molecules.

These processes are particularly important when evaluating viral vectors, because vector-derived proteins may become targets of cellular immune responses.

The relationship between innate and adaptive immunity is central to understanding immunogenicity in gene therapy. Early inflammatory signals can shape later antigen-specific responses, while previous immune exposure can influence how the body responds to subsequent treatment.