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ch 13 toxicology
| Question | Answer |
|---|---|
| Which drug is listed as causing nonimmune-mediated (nonallergic) idiosyncratic hepatotoxicity? | Isoniazid, an antituberculosis drug with nonimmune-mediated effects. |
| Which of the following is an example of an immune-mediated idiosyncratic hepatotoxicity drug? | Halothane, an anesthetic linked to allergic reactions in the liver. |
| What is a key factor in the pathogenesis of idiosyncratic liver injury? | Enhanced individual susceptibility with failure to adapt to drug reactions. |
| How does ethanol exposure contribute to mitochondrial damage? | It shifts the bioactivation/detoxification balance, accumulating acetaldehyde. |
| Nucleoside analog reverse transcriptase inhibitors can cause what type of mitochondrial damage? | They often cause miscoding or early termination of polypeptides. |
| What happens to mitochondrial DNA (mtDNA) due to its reduced repair capacity? | It is more vulnerable to miscoding (mutation) than nuclear DNA |
| What is one observation indicating the role of sinusoidal immune cells in liver injury? | Pretreatments that activate/inactivate Kupffer cells modulate damage. |
| What additional concept does the danger hypothesis add to the hapten hypothesis? | Damaged cells release cytokines that generate costimulatory signals. |
| According to the hapten hypothesis, what presents reactive metabolites to th cells | APCs (antigen-presenting cells) with MHC II molecules effectively. |
| What is the consequence if liver injury is too severe and cell proliferation is inhibited? | The dose-responsive regeneration capacity is exceeded quickly. |
| Carbon tetrachloride exposure primarily leads to what cellular disturbance? | Disturbances of Ca ++ homeostasis and necrotic cell death. |