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Defend or divert: Reactive oxygen species signaling drives opposite EPS strategies in marine bacteria under nanoplastic stress
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Scientists found that tiny plastic particles (nanoplastics) in the ocean force bacteria to react in one of two ways: some bacteria build a protective slimy shield to defend themselves, while others abandon that shield entirely to focus on basic survival, like forming protective spores. This matters because these bacteria play key roles in ocean ecosystems and food chains, so widespread nanoplastic pollution could be quietly reshaping the marine environment that ultimately supplies much of the seafood and oxygen humans depend on.
Nanoplastic pollution represents a pervasive threat to marine ecosystems, yet the molecular mechanisms governing microbial adaptation remain elusive. This study reveals how reactive oxygen species (ROS) signaling drives opposite extracellular polymeric substance (EPS) strategies in marine bacteria under NP stress. Pseudomonas aeruginosa enacts a proactive defend strategy, increasing EPS secretion by 6.66%-53.17%. Driven by a ROS surge, it allocates resources to EPS precursors and maintains transcriptional homeostasis through global fine-tuning to secure protein homeostasis and energy stability. Conversely, Bacillus subtilis undergoes a rapid metabolic divert response, causing a persistent EPS inhibition of 18.49%-27.31%. By systematically redirecting carbon and nitrogen fluxes away from EPS production through the downregulation of precursor-supplying pathways, this strain diverts energy and metabolic precursors toward emergency survival pathways such as membrane homeostasis maintenance, cellular stress protection, and sporulation. Our defend or divert framework provides a mechanistic paradigm for assessing how emerging contaminants dictate cellular resource allocation and reshape the ecological trajectory of marine microbial communities.
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Scientists discovered that microplastics floating in the ocean host thriving communities of bacteria that process nitrogen in ways different from the surrounding seawater, including hundreds of previously unknown bacterial types. This matters because as plastic pollution accumulates in our oceans, it may be quietly reshaping the marine nitrogen cycle, a process essential to ocean ecosystem health and even greenhouse gas levels, adding another layer of environmental concern beyond the plastic itself.
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Researchers studied how a marine diatom (a type of tiny algae) recovers from exposure to polystyrene micro- and nanoplastics by producing a protective slime layer. The algae used reactive oxygen species as a signal to ramp up production of this protective coating, which then trapped and settled the plastic particles. While this shows algae have some natural defense against microplastics, the process also causes the plastics to sink to the ocean floor, potentially concentrating them in sediments where bottom-dwelling organisms and the food chain could be affected.
Multi‐omics insights into surface charge effects to decode the interplay of nanoplastics and bacterial antibiotic resistance
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Researchers discovered that nanoplastics with a positive surface charge help bacteria become more resistant to antibiotics by turning on stress-defense genes and promoting the spread of resistance genes between bacteria. In contrast, negatively charged nanoplastics had the opposite effect, disrupting bacterial communities in ways that could reduce resistance. This finding is important for human health because it suggests that the type of nanoplastic pollution in the environment could influence how quickly antibiotic-resistant superbugs develop and spread.
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