Host cellular components

Host cellular components is a broad, collective term referring to the endogenous molecules, organelles, and pathways within a host cell that are exploited by pathogens, particularly viruses, to facilitate their life cycle (Garcia-Blanco et al., 2004). This category encompasses a wide range of specific targets, including cell surface receptors used for viral entry (e.g., CCR5 or ACE2), cytoplasmic machinery used for protein translation, and nuclear factors required for genomic replication (Zumla et al., 2016). Host-directed therapy (HDT) is a clinical strategy that targets these components rather than the pathogen itself, theoretically providing a higher barrier to the development of drug resistance (Kaufmann et al., 2018). However, because these components are vital for the host's normal biological functions, therapeutic intervention carries a high risk of systemic toxicity and requires careful selection of targets with redundant functions or transient requirements (Zumla et al., 2016). Consequently, this term is considered a descriptive classification or a collection of targets rather than a single, discrete therapeutic target entity.

Other names

Host factorsHost cell machineryHost-dependency factorsHost cell proteinsHost-pathogen interface components

Host-directed therapy involves the modulation of endogenous host cell pathways or structures to inhibit pathogen replication, prevent entry, or enhance the host immune response (Kaufmann et al., 2018).