Paraquat Toxicity Model
Paraquat Toxicity Model - Related Videos
02:56
C. elegans Survival Assay: A Short-Term Toxicity Test
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This video introduces a short-term survival assay that tests a treatment for acute toxicity or tests a genetic strain for resistance to a toxic condition. The example protocol shows an example survival assay in which worms are tested for their ability to resist oxidative stress induced by paraquat (PQ).
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The intensely studied nematode worm Caenorhabditis elegans can be transgenically engineered to express the human β-amyloid peptide (Aβ). Induced expression of Aβ in C. elegans muscle leads to a rapid, reproducible paralysis phenotype that can be used to monitor treatments that modulate Aβ toxicity.
05:44
In vitro Cell Culture Model for Toxic Inhaled Chemical Testing
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Cited by 25 •
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This protocol is designed to demonstrate exposure method of cell cultures to inhaled toxic chemicals. Exposure of differentiated air-liquid interface (ALI) cultures of airway epithelial cells provides a unique model of airway exposure to toxic gases such as chlorine. In this manuscript we describe effect of chlorine exposure on air-liquid interface cultures of epithelial cells and submerged culture of cardiomyocytes. In vitro exposure systems allow important mechanistic studies to evaluate...
12:57
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Cited by 189 •
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Prion-like propagation of protein aggregates has recently emerged as being implicated in many neurodegenerative diseases. The goal of this protocol is to describe, how to use the nematode C. elegans as a model system to monitor protein spreading and to investigate prion-like phenomena.
10:01
Modeling Amyloid-β42 Toxicity and Neurodegeneration in Adult Zebrafish Brain
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This protocol describes the synthesis, characterization, and injection of monomeric amyloid-β42 peptides for generating amyloid toxicity in adult zebrafish to establish an Alzheimer's disease model, followed by histological analyses and detection of aggregations.
FAQs
Redox cycling repeatedly transfers electrons from paraquat to oxygen, generating reactive oxygen species. These chemically reactive molecules can overwhelm cellular defenses, producing oxidative stress rather than a single, isolated injury event. In a toxicity model, this mechanism helps connect paraquat exposure with downstream cellular damage, inflammatory signaling, and loss of normal tissue function, particularly in the lungs.
Reactive oxygen species can promote cellular injury and activate inflammatory signaling pathways. The resulting tissue damage provides signals that alter innate immune activity and influence cytokine production. Studying this sequence helps researchers distinguish the initial toxicant-driven stress from later immune responses, clarifying how oxidative injury can amplify inflammation and contribute to impaired organ function.
Paraquat-induced injury changes the tissue environment in ways that affect innate immune activity. Damaged cells and inflammatory signaling can alter how host defenses respond, including the production of cytokines that coordinate local immune reactions. This connection makes the model useful for examining how an environmental toxicant reshapes early immune responses without treating inflammation as an independent process.
The model can support investigation of linked outcomes across several biological levels: oxidative stress, cellular injury, tissue damage, inflammatory signaling, cytokine production, and impaired organ function. Because these outcomes can be considered together, researchers can study how an initiating exposure progresses toward lung injury and altered host responses rather than examining each consequence in isolation.
Researchers can use these models to examine whether an intervention changes the chain of events associated with exposure, including oxidative stress, tissue injury, inflammatory signaling, or altered immune activity. Such comparisons help identify whether protection occurs broadly or at a particular stage of the response, while also linking candidate interventions to preservation of tissue and organ function.
Toxicant-induced tissue damage can modify innate immune activity, cytokine production, and broader host responses, all of which are important considerations when studying how tissues respond to biological challenges. In immunology and infection research, the model therefore provides context for understanding how environmental exposure and inflammation intersect, including how impaired tissue function may influence the overall host-response environment.