Host intracellular trafficking and processing machinery

The host intracellular trafficking and processing machinery is a vast network of organelles and proteins responsible for the movement, modification, and sorting of cellular cargo (NIH, 2014). This system includes the endocytic pathway for internalizing extracellular material and the secretory pathway for transporting synthesized proteins from the endoplasmic reticulum through the Golgi apparatus to their final destinations (MDPI, 2021). It is governed by a variety of molecular components, such as Rab GTPases, SNARE proteins, and coat proteins like clathrin and COPI/II (ASM, 2015). Numerous pathogens, particularly viruses and intracellular bacteria, hijack this machinery to facilitate their entry, replication, and egress from host cells (Frontiers, 2021). For instance, viruses often exploit endosomal acidification for genome release or use the secretory pathway for the assembly and budding of new virions (NIH, 2018). Consequently, this machinery is a major focus for host-directed therapies, with drugs like chloroquine and various kinase inhibitors being explored to disrupt these essential pathogen-host interactions (University of California, 2018). However, because these pathways are fundamental to normal cell physiology, targeting them carries a high risk of toxicity and requires precise modulation to avoid disrupting host homeostasis (ResearchGate, 2015).

Other names

Endocytic pathwaySecretory pathwayVesicular transport systemHost cell machineryMembrane trafficking machinery

Inhibition of endosomal acidification, disruption of Golgi-mediated protein sorting, inhibition of vesicle scission and fusion, and blockade of host proteolytic enzymes required for pathogen activation (NIH, 2018; University of California, 2018).