Ribotoxic Stress, ZAK Activation and the Orchestration of Inflammatory Signaling Networks in Human Disease.

INTRODUCTION: Ribotoxic stress is an evolutionarily conserved intracellular surveillance mechanism that detects disturbances in translational fidelity and links ribosomal damage to inflammatory and stress-responsive signaling pathways. Diverse pathological stimuli, including microbial toxins, oxidative stress, metabolic dysfunction, and oncogenic translational overload, disrupt ribosome integrity and induce ribosome stalling and collision events. This review aims to summarize current advances in the molecular mechanisms underlying ribotoxic stress sensing, with particular emphasis on the ribosome-associated sterile alpha motif and leucine zipper-containing kinase (ZAK/MAP3K20), downstream Mitogen-Activated Protein Kinase (MAPK) signaling, and the contribution of ribotoxic stress to inflammation and disease pathogenesis. METHODS: This review was conducted as a critical narrative synthesis of the available literature. Relevant studies were identified through systematic searches of PubMed, Scopus, Web of Science, and Google Scholar databases. Experimental, structural, molecular, and translational studies investigating ribotoxic stress, ribosome collision sensing, ZAK activation, MAPK signaling, and inflammatory responses were critically evaluated using predefined inclusion and exclusion criteria. RESULTS: Current evidence indicates that ribosome collisions serve as central molecular triggers of ribotoxic stress signaling. Collision-induced activation of ZAK through autophosphorylation initiates p38 and JNK MAPK pathways, converting translational perturbations into coordinated transcriptional responses that regulate inflammation, apoptosis, stress adaptation and tissue remodeling. Accumulating studies demonstrate that persistent or dysregulated ribotoxic stress signaling contributes to the pathogenesis of infectious diseases, autoimmune disorders, metabolic inflammation, neurodegenerative conditions and cancer. DISCUSSION: The emerging understanding of ribotoxic stress highlights its role as a fundamental mechanism linking translational surveillance to innate immune and inflammatory responses. Unlike classical pathogen-recognition pathways, ribotoxic signaling detects functional disturbances in the translational machinery itself, providing an additional layer of cellular defense. The growing recognition of ZAK-mediated signaling as a central regulator of inflammatory and stress responses underscores its potential importance in disease progression and therapeutic intervention. CONCLUSION: Ribotoxic stress represents a critical interface between translational quality control and inflammatory signaling networks. Advances in understanding ribosome collision sensing and ZAK-dependent MAPK activation have revealed important mechanisms underlying cellular adaptation and disease development. Although several mechanistic questions remain unresolved, targeting ribotoxic stress pathways offers promising opportunities for developing novel therapies for inflammatory, immune-mediated, metabolic, and degenerative diseases.