[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [General pathology](https://durgical.com/en/general-pathology/) › [Cell injury, adaptation and death](https://durgical.com/en/general-pathology/#a-injury) › Other forms of cell death: necroptosis, pyroptosis, ferroptosis [General pathology](https://durgical.com/en/general-pathology/) · [Cell injury, adaptation and death](https://durgical.com/en/general-pathology/#a-injury) # Other forms of cell death: necroptosis, pyroptosis, ferroptosis - Mechanism Some cells burst open on purpose. These planned but messy deaths alarm the immune system and matter in infection and inflammation. Updated 2026-11-01 ## Key points - Necroptosis: TNF signalling with caspase 8 inhibited activates RIPK1, RIPK3 and MLKL, which punches holes in the membrane. - Pyroptosis: inflammasomes activate caspase 1, which cleaves gasdermin D (membrane pores) and matures IL-1β and IL-18. - Ferroptosis: iron-driven lipid peroxidation when glutathione peroxidase 4 or glutathione fails. - All three cause membrane rupture and inflammation, unlike apoptosis. ## What it is Besides apoptosis and accidental necrosis, cells can die by programs that end with membrane rupture and inflammation. Necroptosis is a backup pathway when caspase 8 is blocked; pyroptosis follows inflammasome activation and releases IL-1β; ferroptosis is iron-dependent death by lipid peroxidation. They are active research areas in sepsis, ischemia, neurodegeneration and cancer. ## Key facts - Necroptosis looks like necrosis under the microscope but depends on a signalling program. - Several viruses carry caspase inhibitors; necroptosis may be the host’s answer. - Urate crystals in gout and mutated pyrin in familial Mediterranean fever activate inflammasomes and IL-1β release. ## Regulated forms of cell death compared | Form | Trigger | Key molecules | Result | | --- | --- | --- | --- | | Apoptosis (reference) | DNA damage, death ligands | BCL-2 family, caspases 8, 9, 3 | Shrinking, no inflammation | | Necroptosis | TNF or viral infection with caspase 8 blocked | RIPK1, RIPK3, MLKL | Rupture, inflammation | | Pyroptosis | Microbial products or crystals sensed by inflammasomes | Caspase 1, gasdermin D, IL-1β, IL-18 | Rupture, fever, strong inflammation | | Ferroptosis | Loss of lipid peroxide defences, free iron | GPX4, glutathione, iron | Membrane lipid damage, rupture | | NETosis | Neutrophil activation by microbes | Peptidyl arginine deiminase 4, histones, DNA | Extracellular traps; may promote thrombosis | ## Clinical notes - IL-1 blocking drugs are used in some autoinflammatory diseases driven by inflammasome activation. - In sepsis, pyroptosis and NETs are thought to contribute to inflammation, coagulation and organ dysfunction. ## Memory aid Necro-PTOSIS: a program that ends like necrosis. Pyro means fire (IL-1β fever); ferro means iron (rusting membranes). ## Test yourself Think of the answer, then tap the question to see it. ## Which proteins carry out necroptosis? RIPK1, RIPK3 and the pore-forming protein MLKL, typically when caspase 8 is inhibited. ## What does caspase 1 do in pyroptosis? It cleaves gasdermin D, which forms membrane pores, and processes pro-IL-1β and pro-IL-18 into active cytokines. ## What drives ferroptosis? Iron-dependent peroxidation of membrane lipids when glutathione peroxidase 4 or glutathione is insufficient. [Add to my cards (3)](https://durgical.app/estudiar/?add=/en/general-pathology/other-forms-of-cell-death-necroptosis-pyroptosis-ferroptosis/) ## Related - [Apoptosis: the intrinsic and extrinsic pathways](https://durgical.com/en/general-pathology/apoptosis-the-intrinsic-and-extrinsic-pathways/) - [Apoptosis vs necrosis: the comparison table](https://durgical.com/en/general-pathology/apoptosis-vs-necrosis-the-comparison-table/) - [Oxidative stress and free-radical injury](https://durgical.com/en/general-pathology/oxidative-stress-and-free-radical-injury/) - [Mediators of inflammation: the table to know](https://durgical.com/en/general-pathology/mediators-of-inflammation-the-table-to-know/) - [How septic shock develops](https://durgical.com/en/general-pathology/how-septic-shock-develops/) ## Related conditions - [Sepsis and septic shock](https://durgical.com/en/conditions/sepsis-and-septic-shock/) - [Familial Mediterranean fever and other hereditary autoinflammatory syndromes](https://durgical.com/en/conditions/familial-mediterranean-fever-and-other-hereditary-autoinflammatory-syndromes/) - [Gout](https://durgical.com/en/conditions/gout/) - [Acute pancreatitis](https://durgical.com/en/conditions/acute-pancreatitis/) - [Myocardial Infarction (Heart Attack)](https://durgical.com/en/conditions/myocardial-infarction/) - [Ischaemic stroke](https://durgical.com/en/conditions/ischaemic-stroke/) ## Elsewhere in DurgiPedia - [Pattern recognition: PAMPs, DAMPs, Toll-like receptors](https://durgical.com/en/immunology/pattern-recognition-pamps-damps-toll-like-receptors/) - [Innate immunity (overview, barriers)](https://durgical.com/en/immunology/innate-immunity/) - [Interleukin-1](https://durgical.com/en/immunology/interleukin-1/) - [Neutrophil](https://durgical.com/en/immunology/neutrophil/) - [Glutathione peroxidase (GPX)](https://durgical.com/en/biochemistry/enzymes/glutathione-peroxidase/) - [Iron metabolism](https://durgical.com/en/biochemistry/topics/iron-metabolism/) [← All of general pathology](https://durgical.com/en/general-pathology/) Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given. Sources: [Sepsis: MedlinePlus](https://medlineplus.gov/sepsis.html) (MedlinePlus, US National Library of Medicine, 2024); [MEFV gene: MedlinePlus Genetics](https://medlineplus.gov/genetics/gene/mefv/) (MedlinePlus, US National Library of Medicine, 2024); [4.6 Tissue Injury and Aging](https://openstax.org/books/anatomy-and-physiology-2e/pages/4-6-tissue-injury-and-aging) (OpenStax (Rice University), 2022). ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/general-pathology/other-forms-of-cell-death-necroptosis-pyroptosis-ferroptosis/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/general-pathology/other-forms-of-cell-death-necroptosis-pyroptosis-ferroptosis/