Host immune system pathways

Host immune system pathways represent the integrated network of biological processes and signaling cascades that protect an organism from pathogenic infections and cellular abnormalities such as cancer. These pathways are broadly categorized into innate immunity, providing rapid and non-specific responses, and adaptive immunity, which offers highly specific and long-term memory-based protection. Key molecular events include the recognition of pathogen-associated molecular patterns (PAMPs), the secretion of cytokines and chemokines, and the activation of specialized cells like lymphocytes and myeloid cells. Dysregulation of these pathways is a primary driver of autoimmune disorders, chronic inflammatory diseases, and the failure of immunosurveillance in oncology. Therapeutic strategies frequently target specific nodes within these pathways—such as TNF-alpha, JAK/STAT signaling, or PD-1/PD-L1 checkpoints—to either dampen pathological inflammation or enhance the body's ability to eliminate tumors and pathogens.

Other names

Immune system signalingHost defense pathwaysImmune response pathwaysImmunological pathways

Drugs targeting these pathways act through diverse mechanisms including cytokine neutralization, immune checkpoint inhibition, immunosuppression of T-cell activation, and modulation of inflammatory signaling cascades.