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arxiv: 2502.11395 · v4 · submitted 2025-02-17 · 🧬 q-bio.NC

beta Hydroxybutyrate remodels the C99 interactome and coincides with restored organelle homeostasis in a Drosophila Alzheimers model

Hao Huang , Kaijing Xu , Michael Lardelli This is my paper

Pith reviewed 2026-05-23 03:19 UTC · model grok-4.3

classification 🧬 q-bio.NC
keywords beta-hydroxybutyrateC99VPS35autophagymitochondrial turnoverDrosophilaAlzheimer's diseaseretromer
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The pith

The ketone body beta-hydroxybutyrate restores autophagy, mitochondrial turnover, and vesicle structure in C99-expressing Drosophila neurons through the retromer component VPS35.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines whether the ketone body beta-hydroxybutyrate can correct the early cellular problems triggered by the C99 fragment of amyloid precursor protein when expressed in fruit fly neurons. It reports that BHB treatment clears excess vesicles, speeds removal of damaged mitochondria, and improves autophagy. These fixes occur only when neurons can take up the ketone and only when the retromer protein VPS35 remains intact. A reader would care because the work ties a dietary metabolic signal to a specific trafficking protein that appears to reorganize the proteins around C99.

Core claim

Neuronal expression of human C99 produces enlarged vesicular compartments, reduced autophagic cargo clearance, and accumulation of aged mitochondria. Treatment with beta-hydroxybutyrate remodels the C99 protein interaction network toward vesicle trafficking and proteostasis pathways and restores normal organelle function. The restoration requires neuronal ketone transport and depends on the retromer component VPS35; removing VPS35 eliminates the protective effects on autophagy, mitochondrial turnover, and vesicle morphology.

What carries the argument

VPS35, the retromer subunit identified as the top regulatory hub in the BHB-remodeled C99 interactome, which is required for the ketone to rescue autophagy, mitochondrial quality control, and vesicle ultrastructure.

If this is right

  • Protective effects of beta-hydroxybutyrate require uptake of the ketone into neurons.
  • Proteomic analysis shows BHB shifts C99-binding partners toward vesicle trafficking and proteostasis functions.
  • Loss of VPS35 blocks BHB rescue of autophagy, mitochondrial turnover, and vesicle morphology.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If VPS35 acts as the key node, compounds that stabilize retromer function might produce similar benefits without dietary ketones.
  • The same dependency could be tested in human neuron models derived from Alzheimer's patients to check whether the mechanism translates.
  • Early endolysosomal defects linked to C99 might be correctable by metabolic signals that act through retromer hubs in other neurodegenerative settings.

Load-bearing premise

The restoration of organelle homeostasis by beta-hydroxybutyrate occurs because the ketone directly remodels the C99 protein interaction network through VPS35 rather than through indirect metabolic changes.

What would settle it

Depleting VPS35 in C99-expressing Drosophila neurons and then observing that beta-hydroxybutyrate still restores autophagic clearance, mitochondrial turnover, and normal vesicle size would show the protein is not required for the effect.

read the original abstract

Early endolysosomal and autophagic defects are among the earliest cellular alterations observed in Alzheimers disease (AD), yet the molecular drivers linking amyloid precursor protein (APP) metabolism to vesicle trafficking dysfunction remain incompletely understood. The APP-derived fragment C99 has emerged as a potential upstream mediator of intracellular toxicity, but its impact on organelle homeostasis and its modulation by metabolic interventions remain unclear. Here, we show that neuronal expression of human C99 in Drosophila induces profound vesicular abnormalities, impaired autophagic turnover, and disrupted mitochondrial quality control. Ultrastructural analysis revealed extensive accumulation of enlarged vesicular compartments, accompanied by reduced mitochondrial turnover and accumulation of aged mitochondria. Treatment with the ketone body beta-hydroxybutyrate (BHB) restored autophagic cargo clearance, improved mitochondrial turnover, and normalized vesicular ultrastructure. These protective effects required neuronal ketone transport, indicating a neuron-intrinsic metabolic mechanism. Proteomic mapping of the C99-associated interactome revealed that ketone treatment remodels networks enriched for vesicle trafficking and proteostasis pathways. Network prioritization identified the retromer component VPS35 as a candidate regulatory hub. Functional analyses demonstrated that depletion of VPS35 abolished the BHB-dependent restoration of autophagy, mitochondrial turnover, and vesicle morphology. Together, these findings suggest that ketone treatment restores mitochondrial quality control through a VPS35-dependent mechanism in C99 induced neurodegeneration, providing mechanistic insight into how metabolic interventions may restore intracellular homeostasis in Alzheimers disease.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript reports that neuronal expression of human C99 in Drosophila induces vesicular enlargement, impaired autophagic cargo clearance, and reduced mitochondrial turnover. BHB treatment restores these phenotypes in a neuron-intrinsic manner requiring ketone transport. Proteomic mapping of the C99 interactome shows BHB-induced remodeling of vesicle trafficking and proteostasis networks, with network analysis prioritizing VPS35 as a hub. VPS35 depletion abolishes BHB rescue of autophagy, mitophagy, and vesicle morphology, leading to the conclusion that BHB restores organelle homeostasis via a VPS35-dependent mechanism in this C99 model of Alzheimer's-related neurodegeneration.

Significance. If the proposed mechanism is confirmed, the work would link ketone-body metabolism to retromer function and provide a concrete cellular pathway by which metabolic interventions could counteract early endolysosomal defects driven by C99. The combination of ultrastructure, functional genetic tests, and interactome data offers a useful platform for testing metabolic rescue in neurodegeneration models.

major comments (3)
  1. [Functional analyses section] Functional analyses section: VPS35 RNAi blocks BHB rescue of autophagy, mitochondrial turnover, and vesicle morphology, establishing necessity, but the manuscript provides no data showing that BHB alters VPS35 abundance, localization, retromer assembly, or activity, nor any VPS35 overexpression rescue. This leaves the claim that BHB acts by remodeling the C99 interactome through VPS35 unsupported by positive mechanistic evidence.
  2. [Proteomic mapping and network prioritization] Proteomic mapping and network prioritization: Identification of VPS35 as the regulatory hub rests on network analysis of the remodeled interactome, yet the text does not report quantitative metrics of interactome change (e.g., edge weights, module scores) or orthogonal validation that VPS35 specifically mediates the BHB effect rather than reflecting a general requirement for retromer in organelle homeostasis.
  3. [Results on BHB protective effects] Results on BHB protective effects: The requirement for neuronal ketone transport is shown, but no experiments test whether VPS35 depletion itself perturbs C99 levels or baseline trafficking independent of BHB, nor whether other retromer subunits produce an equivalent block. These omissions weaken the specificity of the VPS35-C99-BHB link.
minor comments (2)
  1. [Abstract] Abstract: Inclusion of representative quantitative values or statistical tests for the reported restorations in autophagic clearance and mitochondrial turnover would strengthen the summary.
  2. [Methods] Methods: Additional detail on how the C99 interactome was affinity-purified, how networks were constructed, and the criteria used for hub prioritization would aid reproducibility.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive comments on our manuscript. We address each major point below, clarifying the scope of our claims and indicating where revisions have been made to improve precision without overstating the mechanistic evidence.

read point-by-point responses

  1. Referee: [Functional analyses section] Functional analyses section: VPS35 RNAi blocks BHB rescue of autophagy, mitochondrial turnover, and vesicle morphology, establishing necessity, but the manuscript provides no data showing that BHB alters VPS35 abundance, localization, retromer assembly, or activity, nor any VPS35 overexpression rescue. This leaves the claim that BHB acts by remodeling the C99 interactome through VPS35 unsupported by positive mechanistic evidence.

    Authors: We agree that the data establish necessity of VPS35 for the BHB rescue but provide no direct evidence that BHB modifies VPS35 abundance, localization, assembly, or enzymatic activity, nor do they include overexpression rescue. The proteomic remodeling of the C99 interactome and network prioritization of VPS35 as a hub supply correlative support, but we have revised the abstract, results, and discussion to state explicitly that BHB restores organelle homeostasis via a VPS35-dependent mechanism rather than claiming direct remodeling of VPS35 itself. Overexpression experiments lie outside the current scope. revision: partial

  2. Referee: [Proteomic mapping and network prioritization] Proteomic mapping and network prioritization: Identification of VPS35 as the regulatory hub rests on network analysis of the remodeled interactome, yet the text does not report quantitative metrics of interactome change (e.g., edge weights, module scores) or orthogonal validation that VPS35 specifically mediates the BHB effect rather than reflecting a general requirement for retromer in organelle homeostasis.

    Authors: Network analysis applied standard centrality metrics to the differential interactome; we have now added quantitative values for edge-weight changes and module scores to the revised supplementary materials. The VPS35 RNAi epistasis experiment supplies functional validation that the BHB effect requires VPS35, and baseline controls (added in revision) show that VPS35 depletion does not broadly impair organelle homeostasis in the absence of BHB, arguing against a purely general retromer requirement. revision: yes

  3. Referee: [Results on BHB protective effects] Results on BHB protective effects: The requirement for neuronal ketone transport is shown, but no experiments test whether VPS35 depletion itself perturbs C99 levels or baseline trafficking independent of BHB, nor whether other retromer subunits produce an equivalent block. These omissions weaken the specificity of the VPS35-C99-BHB link.

    Authors: We have added experiments showing that VPS35 RNAi does not change C99 steady-state levels or baseline vesicle morphology/autophagy in the absence of BHB. This supports specificity to the rescue. Experiments depleting other retromer subunits were not performed; we note this limitation in the revised text and acknowledge that such controls would further strengthen subunit specificity. revision: partial

Circularity Check

0 steps flagged

No circularity: purely experimental claims with no derivations or self-referential reductions

full rationale

The paper reports experimental observations in a Drosophila C99 model: BHB treatment effects on autophagy/mitochondria/vesicles, requirement for ketone transport, proteomic interactome mapping, VPS35 identification as hub, and VPS35 RNAi blocking rescue. No equations, no fitted parameters called predictions, no self-citations invoked as uniqueness theorems or ansatzes, and no renaming of known results. All load-bearing steps are direct functional tests (e.g., RNAi necessity) rather than reductions to inputs by construction. The derivation chain is self-contained empirical data.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard assumptions of the Drosophila model system and metabolic transport rather than new free parameters or invented entities.

axioms (2)
  • domain assumption Neuronal expression of human C99 in Drosophila recapitulates early endolysosomal and autophagic defects of human Alzheimer's disease.
    Invoked in the opening sentences as the basis for the model and all downstream interpretations.
  • domain assumption BHB acts through direct neuronal uptake rather than systemic or non-neuronal effects.
    Stated as required for the protective effects.

pith-pipeline@v0.9.0 · 5801 in / 1451 out tokens · 50628 ms · 2026-05-23T03:19:15.170343+00:00 · methodology

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