🧬 Aging Wiki

2026-06-28

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[2026-06-28] ingest | vascular & lymphatic control of bone aging/regeneration (Kusumbe lab) — YouTube reference-scrape

Triggered by a YouTube interview/lecture (Michael Lustgarten ft. Anjali Kusumbe, PhD — “Vascular Control Of Aging And Regeneration”). Per scraping-youtube-references the video is non-citable (tertiary/promotional); used only as a lead list. The description carried no reference links (affiliate links only), so transcript claims were mapped to the Kusumbe/Adams lab’s actual primary papers, DOIs resolved via Crossref/Europe PMC (not memory), full-texts pulled into the archive, and ingested through the seeder → verifier → propagate pipeline.

Three content threads in the talk: (1) bone lymphatic vessels (published, paradigm-overturning); (2) bone vascular niche aging / type-H vessels (published, foundational); (3) skull-marrow “aging-resilience” claim (published but contested; the lab’s rebuttal is unpublished → kept as a lead, not cited).

Added (7 pages; all seeded then verified end-to-end 2026-06-28)

Study pages:

  • studies/kusumbe-2014-type-h-vessels — type-H (CD31^hi^ Emcn^hi^) vs type-L definition; angiogenesis–osteogenesis coupling; age-decline + deferoxamine/HIF-1α rescue (doi:10.1038/nature13145). Closed the long-standing footnote-only citation on osteoblasts.md.
  • studies/ramasamy-2014-endothelial-notch-bone — endothelial Notch → type-H angiogenesis via endothelial Noggin; DLL4-dependent, EC-autonomous; no aging experiments in this paper (doi:10.1038/nature13146).
  • studies/kusumbe-2016-vascular-niche-aging — age-related decline of type-H + PDGFRβ+ perivascular niche → reduced SCF/HSC support; Notch/PDGF-B partial rescue; cell-intrinsic HSC aging not rescued by niche rejuvenation (limiting-dilution) (doi:10.1038/nature17638).
  • studies/biswas-2023-bone-lymphatics — LYVE1+/PROX1+/VEGFR3+ lymphatics inside bone (overturns alymphatic-skeleton paradigm); IL-6-driven expansion after genotoxic stress; LEC-secreted CXCL12 → HSC regeneration + MYH11+ perivascular progenitors; aged bone LEC senescence + young-LEC rescue (doi:10.1016/j.cell.2022.12.031).
  • studies/koh-2024-skull-marrow-reservoir — claims skull/calvarial marrow is an expanding, aging-resilient hematopoietic reservoir with age-increasing vasculature (doi:10.1038/s41586-024-08163-9). Contested section added (imaging-method critique + independent contradicting preprint), framed as gap/contradictory-evidence; no video/lecture cited for the rebuttal.

Protein pages (closed the wiki’s complete absence of lymphatic-marker coverage):

  • molecules/proteins/prox1 — master TF of lymphatic endothelial identity (UniProt Q92786).
  • molecules/proteins/lyve1 — lymphatic marker + macrophage-co-expression caveat (UniProt Q9Y5Y7); druggability tier 3 (Open Targets).

Propagated (verified atomic sources → existing pages)

  • tissues/bone — new ”# 7. Vascular and lymphatic niche decline” subsection (type-H coupling/decline, bone lymphatics, contested skull); cross-refs + 6 footnotes.
  • tissues/bone-marrow — new ”# Vascular and lymphatic niche decline” aging-feature (niche-vs-intrinsic dissection, lymphatic CXCL12 niche, contested skull); hallmark-table edit; 4 footnotes.
  • cell-types/osteoblasts — fixed two verifier-confirmed errors in the existing Kusumbe-2014 treatment (aged cohort 57–70 → 64–70 wk; DFM 6 weeks for the bone-mass result, dropped the unverifiable “4–5 weeks” dosing string); added Notch(2014)/2016-niche context + study-page links.
  • molecules/proteins/cxcl12 — cited the previously-uncited type-H rarefaction bullet (Kusumbe 2016); added lymphatic-endothelial CXCL12 as an injury-inducible niche source (Biswas 2023).
  • cell-types/endothelial-cells — added bone type-H + lymphatic-EC senescence as organ-specialized facets of EC aging; cleaned two grandfathered paper-archive footnote annotations in passing.

Verifier-caught corrections (adversarial pass paid off)

  • Fabrication: the Kusumbe-2016 seeder invented a non-existent “Ramasamy et al. 2016 companion paper” (with wrong co-authors) — replaced with the real 2014 papers.
  • Source-typo propagation: Biswas 2023 body text says “p27” but Figure 6L measures p21 (Cdkn1a) — corrected on the study page + prox1 (the senescence-marker panel).
  • Ramasamy-2014: conflated two in-vitro Noggin experiments — corrected.
  • Numerous n/p-value precisions on Kusumbe-2016 (e.g., P<0.05 → P<0.0001 for niche-cell decline) brought to source.
  • Koh-2024 imaging method corrected (dura whole-mount vs calvarial cryosections — load-bearing for the contested section).

Leads NOT ingested (per SOP — flagged, not cited to the video)

  • Unpublished Kusumbe-lab rebuttal of skull resilience (presented in the talk) — recorded only as the contested framing on koh-2024. A 2025 multi-lab bioRxiv preprint (Yang et al., doi:10.1101/2025.10.02.679940) independently contradicts Koh 2024 and is cited as a preprint (non-peer-reviewed flag) to document the controversy — supersession candidate to re-cite if/when published.
  • Q&A speculation (pericyte→fibroblast transition energetics, mitochondrial transfer, microbial-burden danger-signal hypotheses, mandible-vs-calvaria chewing/loading) — conversational, not ingestable as claims.
  • [[pdgfrb]], [[hif1a]]/[[hif-1alpha]], [[vegfr3]]/FLT4, [[coup-tfii]] (NR2F2) — referenced by the new vascular/lymphatic pages; not yet seeded.
  • Bigger greenfield: no dedicated lymphatic-vessel tissue page or lymphatic-endothelial-cell type page yet (the bone finding currently lives on bone/bone-marrow + the two marker proteins).

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