The Upstream Mechanism Continuity Signaling as Cellular Maintenance Driver

ABSTRACT — The Upstream Mechanism (v3-3)(Abstract compiled from the document; the source has no standalone abstract section.)The Upstream Mechanism provides the molecular operationalization of continuity signaling as a cellular-maintenance driver, unifying three conditions usually studied in isolation — Autism Spectrum Disorder, Major Depressive Disorder, and Alzheimer's Disease — as the same failure interrupted at different developmental or temporal loci. The central claim: when the molecular signals of biological and relational continuity, primarily oxytocinergic co-regulation, are chronically absent, cells progressively withdraw investment in somatic maintenance. The result resembles programmed death but is abandoned maintenance — and abandoned maintenance can, in principle, be reversed.Two cascades are identified. Signal 1 (positive): oxytocin activates TET2, the enzyme driving active DNA demethylation that keeps genes accessible. Signal 2 (negative): chronic cortisol elevates mitochondrial ROS, which indirectly inhibits telomerase (TERT) and damages telomeric DNA, driving cells into senescence and a Senescence-Associated Secretory Phenotype. When both fail simultaneously, the cell receives no maintenance signal and a strong degradation signal, ceasing self-repair over months in depression and over decades in Alzheimer's. Oxytocin is reframed not as a social neurotransmitter but as a survival protocol conserved across ~700 million years — the basal maintenance protocol of the organism.Experimental anchoring: Maejima et al. (2025, Aging Cell) showed that 10 days of nasal oxytocin in aged mice restored hypothalamic TET2 expression, reversed the decline in 5-hydroxymethylcytosine, and normalized plasma OXT. The paper contributes the formalization of OXT–TET2 as the molecular correlate of tᴷᴿ (Katharós relational capital), five testable predictions (PT1–PT5), a dual-channel neonatal screening proposal, and the ETK–AD causal chain (ACE → chronic OXTR hypermethylation → TET2 underactivation → AQP4 mislocalization [S] → glymphatic/ALPS decline preceding amyloid → AD). Epistemic status is marked throughout ([C]/[D]/[S]); intergenerational offspring transmission remains an open prediction (G-UP-1).