type I interferon / JAK-STAT chronic activation is strong but context-dependent, not yet a universal bottleneck

type I interferon / JAK-STAT chronic activation: strong aging node, but not yet a universal longevity bottleneck

''结论'': IFN-I / JAK-STAT chronic activation should currently be treated as a context-dependent inflammaging amplifier, not as a universally validated long寿瓶颈。

''理由'':
# 在综述与原始研究中，IFN-I 信号在衰老组织、DNA damage、线粒体失衡和神经炎症里反复升高；
# 在短端粒/ DNA damage / POLG mutator / progeria 等模型里，抑制 IFNAR 或下调 STAT1 可改善 senescence、stem-cell decline、healthspan 相关表型；
# 但检索到的强证据仍主要来自 progeroid、mutator 或 disease-context，缺少足够的 wild-type lifespan 延长证据，且不同组织的效应高度依赖细胞类型与局部语境。

''可复用判断''：当一个免疫轴既有强 age-association 又能在特定病理模型里被逆转，也不要自动把它升级为通用长寿瓶颈；必须再问：是否有 wild-type healthspan/lifespan 终点？是否跨组织成立？是否只是 inflammaging 回路读出而非上游总开关？

''可引用证据'':
- Yu et al., Cell Reports 2015: DNA-damage-induced type I interferon promotes senescence and inhibits stem cell function; IFN receptor ablation rescues shortened-telomere mice from accelerated aging.
- Lei et al., sci adv 2021 / review summaries: aberrant IFN-I activation in POLG mutator mice reduces healthspan; IFNAR ablation extends lifespan in that context.
- 2024 brain-aging studies: aged brain shows elevated IFN-I signature, but manipulations are currently tissue- and cell-type-specific.