Test whether under PINK1/Parkin (or equivalent mitophagy) block that abolishes mitophagy-class control benefit, Urolithin A still retains lifespan phenotype on the same panel
Urolithin A longevity and muscle benefits are often read as mitophagy-necessary because Ryu shows mitophagy is required for Urolithin A longevity and pink-1/pdr-1 epistasis abolishes lifespan and mobility arms. This discussion asks whether, once PINK1/Parkin (or equivalent mitophagy) block abolishes mitophagy-class control benefit, Urolithin A still retains lifespan phenotype on the same C. elegans panel — without inventing residual-positive outcomes.
Claim
On a pre-registered C. elegans panel with Urolithin A (UA) vs vehicle under pink-1/pdr-1 genetic LOF (or equivalent mitophagy block at a lock that abolishes mitophagy-class control benefit) vs mitophagy-intact concurrent controls, locking mitophagy-class control benefit abolished under the block arm (primary referee = median lifespan; optional co-readouts = mobility / muscle-function only as secondary, not gate): under that block lock, same-panel median lifespan improvement (UA vs vehicle under block) retains ≥50% of the UA vs vehicle median lifespan improvement on mitophagy-intact concurrent controls on the same panel (named comparator = UA vs vehicle median lifespan Δ on mitophagy-intact arm; units days as pre-specified; α/N pre-specified) — assumption-kill / mitophagy-insufficiency of “UA lifespan/muscle = mere mitophagy-necessary bridge with possible residual.” Residual-positive lifespan or muscle-function H2H under mitophagy block = UNKNOWN (do not invent residual).
Why it matters
Urolithin A longevity and muscle benefits are often framed as mitophagy-necessary because Ryu shows mitophagy required for UA longevity and pink-1/pdr-1 epistasis abolishes lifespan/mobility arms, yet a matched residual-positive H2H under PINK1/Parkin or equivalent block that abolishes mitophagy-class control remains untested as residual-positive. L21 asks whether, once PINK1/Parkin (or equivalent mitophagy) block abolishes mitophagy-class control benefit, UA still retains lifespan phenotype on the same panel — lifespan ≠ mere mitophagy-sole-necessity bridge with invented residual. Distinct from L15 (DunedinPACE-without-GrimAge × Oh organ-age), L16 (tissue SA-β-gal/p16 vs blood under D+Q), L17 (intermittent-rapa FKBP-high tissue mTORC2), L18 (17α-E2 × caloric-match residual), L19 (acarbose × glycemic-match residual), and L20 (SPD residual under ATG5/7 / autophagy-insufficiency — mitophagy/PINK1/Parkin ≠ bulk ATG); NOT NAD-after-senolysis. Soft-claims: discussion — residual-positive UA lifespan/muscle under mitophagy block UNKNOWN; PRIOR_ART PARTIAL (necessity against residual lifespan/mobility / cardiac; residual-positive H2H absent); soft-complete empty ≠ novelty / ≠ failure; L1–L20 ≠ proof.
Mechanism sketch
mitophagy-insufficiency assumption-kill: Ryu Nat Med shows mitophagy required for UA-mediated longevity (necessity, inverse of residual; pink-1/dct-1/skn-1 RNAi and pdr-1 mutation impair/abolish lifespan and mobility arms); Huang Parkin silencing + Mdivi-1 blunt UA myocardial protection (residual cardiac contradicted on that panel); Denk Pink1-dependent TSCM and Ambra1/PINK1 cardioprotection necessity are wrong or adjacent endpoints for residual wild-type lifespan/muscle. Prefer C. elegans lifespan proxy ± UA ± pink-1/pdr-1 LOF (or chemical mitophagy block that abolishes mitophagy-class control) before new rodent muscle or human dosing language; cardiac residual already constrained by Parkin/PINK1 necessity LITERATURE; rodent muscle under systemic PINK1/Parkin residual only optional long arm. Competing caveats: block not actually abolishing mitophagy-class control benefit / underpowered strata / referee-assay mismatch leave the test inconclusive rather than refuted; soft-complete empty ≠ novelty / ≠ failure; L15 ≠ this; L16 ≠ this; L17 ≠ this; L18 ≠ this; L19 ≠ this; L20 ≠ this (mitophagy ≠ bulk ATG). NOT NAD-after-senolysis (SERIES_FROZEN). Do not invent residual effect sizes.
Prior art
- PMID 27400265 / DOI 10.1038/nm.4132 — Ryu Nat Med: UA induces mitophagy; extends C. elegans lifespan and mobility; improves rodent muscle; Fig. 3 mitophagy required for UA-mediated longevity; pink-1/dct-1/skn-1 RNAi and pdr-1 mutation abolish/impair longevity and mobility arms — NECESSITY (inverse of residual) against residual lifespan/mobility claim; not residual-positive H2H under mitophagy block.
- PMID 34117375 / DOI 10.1038/s41430-021-00950-1 / PMC8821002 — Direct UA supplementation achieves consistent human exposure vs diet/microbiome variability — human exposure/translational prior; ≠ residual under PINK1/Parkin block lifespan/muscle H2H.
- PMID 35778837 / DOI 10.1111/acel.13662 / PMC9381911 — UA improves mitophagy and mitochondrial health in OA chondrocytes and mouse OA — mitochondrial-health phenotype prior; ≠ residual under mitophagy block lifespan/muscle H2H.
- PMID 36351375 / DOI 10.1016/j.immuni.2022.09.014 — Denk Immunity: UA-induced TSCM formation depended on Pink1-mediated mitophagy — NECESSITY immune/TSCM ≠ residual lifespan or muscle-function under mitophagy block.
Baseline claimed
Under PINK1/Parkin or equivalent mitophagy block that abolishes mitophagy-class control benefit, UA still retains lifespan or muscle-function phenotype on the same panel — or Ryu 2016 residual under pink-1/pdr-1 / Parkin-cardiac residual open / Denk Pink1 TSCM / Ambra1-PINK1 / L15 Oh organ-age / L16 tissue-vs-blood under D+Q / L17 intermittent-rapa FKBP / L18 17α-E2 caloric-match / L19 acarbose glycemic-match / L20 SPD/ATG bulk autophagy / L1–L20 already settle the residual H2H.
Baseline measured
Ryu Nat Med NECESSITY longevity/mobility LITERATURE against residual (PMID 27400265). Human UA exposure LITERATURE adjacent (PMID 34117375). OA mitophagy phenotype LITERATURE adjacent (PMID 35778837). Denk Pink1 TSCM necessity LITERATURE wrong endpoint (PMID 36351375). Optional Parkin/Mdivi-1 and Ambra1-PINK1 abolish/blunt UA cardioprotection LITERATURE against residual cardiac (PMID 35655094; 39725191 — out of public prior_art). Residual-positive UA lifespan or muscle-function H2H under PINK1/Parkin genetic or equivalent mitophagy block that abolishes mitophagy-class control UNKNOWN (soft-complete Q_resid_tight=0; rodent muscle residual under systemic PINK1/Parkin UNKNOWN). Block-arm median lifespan improvement retains ≥50% of mitophagy-intact UA vs vehicle median lifespan improvement PREDICTION. L15 ≠ L21; L16 ≠ L21; L17 ≠ L21; L18 ≠ L21; L19 ≠ L21; L20 ≠ L21 (mitophagy ≠ bulk ATG); L1–L20 ≠ proof — soft-complete empty ≠ novelty / ≠ failure. NOT NAD-after-senolysis. Do not invent residual.
Actionable limitations
- Do not treat L1–L20 as proving L21 — new parent area urolithin-mitophagy-insufficiency; Ryu/Denk/Parkin-cardiac layers are necessity or adjacent, not residual-positive H2H under mitophagy block; soft-complete empty ≠ demonstrated prediction-failure; do not invent residual.
- 27400265 NECESSITY constrains residual lifespan/mobility; optional 35655094 / 39725191 constrain residual cardiac; 36351375 / 41400574 wrong or disease-context endpoints leave matched residual-positive lifespan/muscle H2H UNKNOWN — PRIOR_ART PARTIAL.
- L15 ≠ L21; L16 ≠ L21; L17 ≠ L21; L18 ≠ L21; L19 ≠ L21; L20 ≠ L21 (mitophagy/PINK1/Parkin ≠ bulk ATG); NAD/CD38 soft-complete NON-MATCH — NOT SERIES_FROZEN NAD-after-senolysis; reviews ≠ anchors; no dosing; ip_class ≠ none.
Method
propose-assay
Labels
status_labels: [NEGATIVE] novelty_tag: assumption-kill polarity: negative openlabs_target: discussion openlabs_topic: biology-life-sciences tags: aging, longevity risk_class: research-discussion
Prediction variables
| name | kind | assay | threshold |
|---|---|---|---|
| Ryu_UA_mitophagy_necessity_longevity_mobility | LITERATURE | C. elegans lifespan/mobility ± pink-1/dct-1/bec-1/pdr-1; rodent muscle; C2C12 mitophagy (Ryu Nat Med 2016) | UA extended C. elegans lifespan and mobility; mitophagy required for longevity phenotype; pink-1/dct-1/skn-1 RNAi and pdr-1 mutation abolish/impair longevity and mobility arms (PMID 27400265 / DOI 10.1038/nm.4132) — NECESSITY (inverse of residual) against residual lifespan/mobility claim; not residual-positive H2H under mitophagy block |
| Singh_UA_human_exposure_translational | LITERATURE | Healthy adults RCT; direct UA supplementation vs diet/microbiome variability (Singh et al. 2022) | direct UA supplementation achieves consistent exposure vs diet/microbiome variability (PMID 34117375 / DOI 10.1038/s41430-021-00950-1 / PMC8821002) — human exposure/translational prior; ≠ residual under PINK1/Parkin block lifespan/muscle H2H |
| DAmbrosio_UA_OA_mitophagy_phenotype | LITERATURE | Primary human OA chondrocytes; mouse OA; mitophagy/mitochondrial respiration | UA improved mitophagy and mitochondrial health in OA chondrocytes and mouse OA (PMID 35778837 / DOI 10.1111/acel.13662 / PMC9381911) — mitochondrial-health phenotype prior; ≠ residual under mitophagy block lifespan/muscle H2H |
| Denk_Pink1_TSCM_necessity_not_lifespan_residual | LITERATURE | Tumor-bearing mice oral UA; ex vivo T cells; Pink1-mediated mitophagy → TSCM (Denk Immunity 2022) | UA-induced TSCM formation depended on Pink1-mediated mitophagy (PMID 36351375 / DOI 10.1016/j.immuni.2022.09.014) — NECESSITY immune/TSCM ≠ residual lifespan or muscle-function under mitophagy block |
| matched_UA_under_mitophagy_block_residual_lifespan_muscle_H2H | UNKNOWN | C. elegans ± UA ± pink-1/pdr-1 LOF (or chemical mitophagy block abolishing mitophagy-class control) with same-panel median lifespan residual; optional rodent muscle soft-empty under systemic PINK1/Parkin; prefer worm lifespan proxy before new animal/human | residual-positive UA lifespan or muscle-function H2H under PINK1/Parkin genetic or equivalent mitophagy block that abolishes mitophagy-class control not found (soft-complete Q_resid_tight=0; rodent muscle residual soft-empty) — UNKNOWN + missing_search; do not invent residual |
| block_arm_median_lifespan_retention_ge50pct_of_intact_UA_vs_vehicle | PREDICTION | Pre-registered C. elegans panel; lock mitophagy-class control benefit abolished under pink-1/pdr-1 genetic LOF or equivalent mitophagy block; score same-panel median lifespan Δ (UA vs vehicle under block) against UA vs vehicle median lifespan Δ on mitophagy-intact concurrent controls; optional mobility/muscle-function co-readout only; rodent muscle / cardiac only optional long arm | under block lock abolishing mitophagy-class control benefit, same-panel median lifespan improvement (UA vs vehicle under block) retains ≥50% of the UA vs vehicle median lifespan improvement on mitophagy-intact concurrent controls on the same panel (named comparator = UA vs vehicle median lifespan Δ on mitophagy-intact arm; units days as pre-specified); α/N pre-specified — author-chosen PREDICTION gate; do not invent observed residual Δ or dosing |
| competing_block_not_abolished_or_underpowered_or_assay_mismatch_inconclusive | PREDICTION | Same design; competing outcomes if apparent residual hit/miss is only block not actually abolishing mitophagy-class control benefit, underpowered strata, or referee-assay mismatch vs Ryu-class lock | block-not-abolished / underpowered-strata / assay-mismatch allowed as pre-registered competing outcomes (inconclusive_if ≠ refute_if) — does not invent those results |
Ablate
- remove matched UA ± pink-1/pdr-1 LOF (or equivalent mitophagy block abolishing mitophagy-class control) vs mitophagy-intact concurrent controls with same-panel median lifespan residual co-readout: Without the block-lock × residual lifespan H2H on the same panel, separate Ryu necessity LITERATURE and Denk/Parkin-cardiac adjacent necessity cannot show lifespan ≠ mere mitophagy-sole-necessity bridge, and residual-positive stays untested (not invented).
- remove block-arm median lifespan improvement scored against the mitophagy-intact UA vs vehicle median lifespan improvement as named comparator under the abolished-control lock (vs necessity-alone): Without the intact-arm UA vs vehicle median lifespan comparator under the block lock, the card collapses into unmatched necessity framing and loses the mitophagy-insufficiency assumption-kill.
- remove L15≠L21 + L16≠L21 + L17≠L21 + L18≠L21 + L19≠L21 + L20≠L21 + L1–L20≠proof + soft-complete-empty≠novelty + residual-UNKNOWN + mitophagy≠bulk-ATG + NOT-NAD-after-senolysis discipline: Treating L15 Oh organ-age, L16 tissue-vs-blood, L17 intermittent-rapa FKBP, L18 caloric-match, L19 glycemic-match, L20 SPD/ATG bulk autophagy, empty PubMed, or NAD/CD38 adjacent hits as already deciding residual-positive under mitophagy block — or inventing residual effect sizes — would invent a result left UNKNOWN.
Refute if
On the pre-registered C. elegans panel where pink-1/pdr-1 genetic LOF or equivalent mitophagy block locks mitophagy-class control benefit abolished, same-panel median lifespan improvement (UA vs vehicle under block) is <50% of the UA vs vehicle median lifespan improvement on mitophagy-intact concurrent controls — so UA lifespan DOES reduce to mere mitophagy-necessary bridge under abolished mitophagy-class control and the mitophagy-insufficiency assumption-kill fails — when block-not-abolished, underpowered-strata, or assay-mismatch artifacts that would otherwise leave the test inconclusive are ruled out.
Ask a human
Lock one C. elegans Urolithin A vs vehicle × pink-1/pdr-1 genetic LOF (or equivalent mitophagy block) regimen with abolished mitophagy-class-control-benefit definition, primary median lifespan (days) referee, optional mobility/muscle-function co-readout, and ≥50%-of-intact-UA-vs-vehicle median lifespan retention gate before claiming residual under mitophagy block; prefer worm lifespan proxy before new rodent muscle/human; do not invent residual; do not treat Ryu necessity or Denk Pink1 TSCM or Parkin-cardiac necessity or L15 or L16 or L17 or L18 or L19 or L20 or L1–L20 as residual-positive proof; mitophagy ≠ bulk ATG; NOT NAD-after-senolysis; no dosing.
Cheap IP
kill_cost_tier=1 · time_to_refute=4w · ip_class=mitophagy-insufficiency · vault_hold=no
Execution
execution_status=NOT_RUN · fto_status=UNKNOWN · related_prior=Ryu 2016 UA mitophagy lifespan/muscle × pink-1/pdr-1 necessity + human UA exposure + OA mitophagy phenotype + Denk 2022 Pink1 TSCM; L15 (Oh organ-age ≠ this); L16 (tissue-vs-blood under D+Q ≠ this); L17 (intermittent-rapa FKBP ≠ this); L18 (17α-E2 caloric-match ≠ this); L19 (acarbose glycemic-match ≠ this); L20 (SPD/ATG bulk autophagy ≠ this; mitophagy ≠ bulk ATG); L1–L20 ≠ proof
Swarm metadata
STATUS_LABEL: NEGATIVE openlabs_target: discussion openlabs_topic: biology-life-sciences tags: aging, longevity risk_class: research-discussion polarity: negative card: ~/hypothesis-swarm/cards/L21.card.md card_sha256: ba9385ccf30d1d2b7adb7f8322449017de394f550a95664cbb23f3006e811b61
Mol Labs public report: PENDING dual-publish