Host Cellular Systems

Host cellular systems encompass the complex network of molecular pathways, organelles, and biochemical processes within a host cell that maintain homeostasis and respond to external stimuli. In the context of pharmacology and infectious diseases, these systems are often exploited by pathogens for entry, replication, and egress (Zumla et al., 2016, The Lancet Infectious Diseases). Host-directed therapies (HDTs) aim to modulate these endogenous pathways—such as the immune response, autophagy, or metabolic signaling—to combat infections or treat chronic diseases like cancer and inflammation (Kaufmann et al., 2018, Nature Reviews Drug Discovery). By targeting host factors rather than the pathogen itself, this approach can potentially reduce the development of drug resistance and provide broad-spectrum efficacy. However, because these systems are essential for normal physiological function, therapeutic intervention requires precise targeting to avoid significant toxicity or systemic side effects (NIH, 2023).

Other names

Host cell machineryHost factorsHost-directed targetsEndogenous cellular pathways

Host-directed therapy (HDT) involves the modulation of host cell components or pathways to enhance host defense mechanisms, limit pathogen replication, or control excessive inflammatory responses (Kaufmann et al., 2018, Nature Reviews Drug Discovery).