NMN in streptozotocin-treated INS-1 islet cells: ferroptosis markers and Nrf2/GPX4
In cultured INS-1 islet cells, the abstract reports that NMN reduced streptozotocin-induced iron accumulation, oxidative and lipid-peroxidation markers and mitochondrial changes, and raised Nrf2 and GPX4; this is cell-level laboratory work, not evidence of benefit in people. [1]
Automatic summary · not editorially reviewed
The key findings
In cultured INS-1 islet cells, NMN increased cell viability after treatment with streptozotocin or erastin and mitigated streptozotocin-induced cell injury. [1]
Streptozotocin-exposed INS-1 cells showed higher intracellular Fe2+ and reactive oxygen species and lower superoxide dismutase and glutathione activity; NMN reduced iron accumulation and restored these activities. [1]
Compared with streptozotocin or erastin treatment, cotreatment with NMN further reduced Keap1 and significantly increased Nrf2 and GPX4; the authors propose this pathway may explain the effect. [1]
The source at a glance
- Study type / format
- Laboratory cell-culture study (abstract)
- Population / context
- Cultured INS-1 islet β-cells exposed to streptozotocin or erastin
- Summary based on
- Study abstract
- Original publication
- August 17, 2026
INS-1 cells exposed to streptozotocin or erastin
The abstract describes experiments in INS-1 cells, a cultured islet β-cell line. The authors state that how nicotinamide mononucleotide (NMN) affects streptozotocin (STZ)-induced islet β-cell dysfunction was not fully clarified, and they set out to study the effect and mechanism. NMN increased INS-1 cell viability after treatment with either STZ or erastin and mitigated STZ-induced cell injury. These are comparisons in cultured cells; the abstract reports no animals and no people.
Supporting source [1]
Iron, oxidative stress and mitochondrial changes in STZ-exposed cells
After exposure to STZ, INS-1 cells showed significantly higher intracellular Fe2+ and reactive oxygen species levels and significantly lower superoxide dismutase and glutathione activity. Lipid peroxidation and malondialdehyde rose substantially, and the mitochondrial membrane potential fell significantly. Electron microscopy showed shrunken mitochondria, ruptured mitochondrial membranes and disintegrated cristae. NMN markedly reduced intracellular iron accumulation, then lowered reactive oxygen species, lipid peroxidation and malondialdehyde while restoring glutathione and superoxide dismutase activity. It also restored the mitochondrial membrane potential and reversed the STZ-induced changes in mitochondrial morphology.
Supporting source [1]
Nrf2/GPX4 pathway findings and abstract-only scope
Compared with STZ treatment, ferrostatin-1 significantly increased Nrf2 and GPX4 expression, whereas erastin suppressed them. Compared with STZ or erastin treatment, cotreatment with NMN further reduced Keap1 expression and significantly increased Nrf2 and GPX4. The authors conclude that NMN may alleviate STZ-induced ferroptosis in INS-1 cells by activating the Nrf2/GPX4 pathway, offering a theoretical basis for treating diabetes mellitus. This is a proposed mechanism in a cell line, not a demonstrated treatment. Only the abstract was reviewed; the full text was not reviewed, so details of design, replication and statistics beyond the abstract are unknown.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Findings come from the cultured INS-1 cell line, not animals or humans, and the Nrf2/GPX4 mechanism is proposed, not established. Design details, replication and statistics beyond the abstract are not reported here.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Lu D, Huang J, Meng J, Luo J, Huang X. · europepmc.org · August 17, 2026