Kinetic control of macrophage death by PTM-turnover crosstalk in infection and inflammation.

Macrophage fate decisions during infection are commonly framed as receptor-proximal transcriptional choices. We propose that the functional outcome results from a "kinetic race," a dynamic proteostatic competition among protein synthesis, post-translational modifications (PTMs), and degradation. Building on experimental evidence of infection-induced proteostasis, we outline a conceptual "turnover-first" framework. In this model, we hypothesize that the ubiquitin proteasome system (UPS), autophagy, and translational control create a master molecular timer that licenses or restrains pyroptosis, apoptosis, necroptosis, and PANoptosis. We detail how PTMs act as decision codes and present examples of how bacterial pathogens and viruses hijack this network, deploying specialized effectors to move death thresholds by host shutoff, ubiquitin/ISG15 editing, and autophagy evasion. We summarize the emerging chemical biology platforms allowing quantification of these "death competence codes" in real-time, and map drug-addressable nodes offering a systems level strategy to tune macrophage longevity and inflammatory output in sepsis and infectious disease.