IgG is a strong age-amplifying node, but not yet a universal longevity bottleneck

IgG is a strong age-amplifying node, but not yet a universal longevity bottleneck

''结论'': IgG / antibody accumulation can be a bona fide aging amplifier: the 2024 Cell Metabolism paper IgG is an aging factor that drives adipose tissue fibrosis and metabolic decline reports age-associated IgG buildup in white adipose tissue, macrophage activation, fibrosis, metabolic decline, and improved healthspan/lifespan when the FcRn recycling axis is blocked in macrophages.
''判断'': Despite this, the public evidence still clusters in a specific tissue context (adipose/metabolic aging). It does not yet establish a multi-organ, cross-readout, universal longevity bottleneck, nor does it beat more upstream immune-source entries like Thymic source restoration is a strong immune upstream entry, but not yet a universal longevity bottleneck.
''可复用原则'': If a candidate is strong in one aging compartment but lacks cross-organ causality and head-to-head comparison against upstream immune source restoration, classify it as an ''aging amplifier'' rather than a universal bottleneck.