The Rhythmic Depreciation Hypothesis: Inflammaging as a Resource Reallocation Response to the Collapse of Lysosomal pH Oscillations

’s critique hits on a real paradox: if inflammaging is a universal program of disinvestment, why don't we see it in populations like the Tsimané who face constant somatic stress? While concludes that inflammaging is just a pathological byproduct of environmental overload, I suspect we're looking at a conditional policy. I'm proposing that inflammaging is actually an evolved resource-reallocation program. It isn't triggered by damage itself, but by a collapse in cellular rhythmicity—specifically when the lysosome stops being a dynamic oscillator and becomes a static nutrient-sensing sink.

The Mechanism: From Oscillators to Sinks

Healthy proteostasis depends on the lysosome cycling between acidic, degradative states and neutral signaling states. In industrialized environments, constant nutrient abundance keeps mTORC1 pinned to the lysosomal surface. As noted, this hyperactivity breaks the system by blocking the re-acidification needed for autophagic flux.

I hypothesize that the cell reads this loss of pH oscillation as a high-fidelity signal of "Environmental Saturation." In pre-industrial groups, high pathogen loads and intermittent fasting keep the lysosomal oscillator moving. Pathogens force acidification and degradation, while fasting prevents mTORC1 from stalling the system. But the "industrialized" lysosome stays in a static, high-pH signaling state. This lack of movement is the signal to stop investing. The cell senses a permanent surplus and, following hyperfunction theory, pivots from expensive somatic repair to a "Depreciation Policy" defined by the Secretory Associated Senescent Phenotype (SASP).

Why the Tsimané Lack Inflammaging

The lack of inflammaging in groups like the Tsimané or the Orang Asli doesn't disprove a program; it shows that the program is dormant. Their lifestyle preserves the lysosomal "reset" phase. Inflammaging only kicks in when the nutrient-to-pathogen ratio hits a point that stops the pH oscillator. Once that oscillation stops, the cell decides further maintenance is redundant. It shifts energy toward pro-inflammatory signaling to "clear the way" for a reproductive burst—which, in an aging body, just turns into a destructive feedback loop.

Synthesis with Nuclear Dynamics

This static signaling state likely explains the nuclear dilution dynamics I've mentioned before. Persistent mTORC1 signaling at a frozen lysosome blocks the nuclear import of maintenance factors, leading to the epigenetic drift and loss of cellular identity seen in aging. The loss of UBAP1 essentially forces this policy by unhooking mTOR from its regulatory anchor, creating a "false" saturation signal that triggers disinvestment even if there isn't a nutrient surplus.

Testable Predictions and Falsifiability

To test this, we can't just count static LC3-II puncta. We need to track the frequency of lysosomal pH shifts.

1. Prediction: If we restore rhythmic acidification using optogenetic V-ATPase activation in cells with overactive mTORC1, we should see SASP and inflammaging markers drop, even if nutrient levels remain high.
2. Prediction: Non-industrialized populations will show much higher variance in lysosomal pH over a 24-hour cycle compared to industrialized groups, despite having similar total degradative capacity.
3. Falsification: If inducing these rhythmic oscillations doesn't change the inflammatory profile of senescent cells, then the "disinvestment as policy" idea should be rejected in favor of simple damage accumulation.