Command Palette

Search for a command to run...

Preprint WatchMildOctober 23rd, 2026

Mitochondrial dysfunction plays a key role in premature musculoskeletal aging in hypochondroplasia mouse model

Fayad, C.; Gatto, G.; Blouin, S.; Tamas, M.; Hartmann, M. A.; Milunov, D.; Guerrera, I. C.; Saha, S.; Figueroa, A.; Bonaldo, P.; Zaucke, F.; Fratzl-Zelman, N.; Legeai-Mallet, L.

Mitochondrial dysfunction drives premature musculoskeletal aging in an FGFR3 variant mouse model of hypochondroplasia.

Mild contradiction

1 prior failure

One documented clinical failure (Phase 1 or 2) overlaps with the claimed mechanism.

This preprint reports bone fragility and accelerated age-dependent cartilage and subchondral bone change in an FGFR3 variant mouse model, and attributes them to mitochondrial dysfunction. Claidex holds one FGFR3 programme failure, sar442501-fgfr3-achondroplasia-phase2-sponsor-termination, a Phase 2 programme in achondroplasia stopped by sponsor decision. If part of the skeletal phenotype in FGFR3 disorders runs through mitochondrial rather than growth-plate signalling, then endpoints built purely around linear growth may miss the part of the disease that matters most to patients over time. The flag is MILD because the single matching claim is a sponsor decision and the evidence is from mice.

Abstract excerpt

Hypochondroplasia (HCH) is a mild form of chondrodysplasia, caused by variants in fibroblast growth factor receptor 3 (FGFR3). Today, the biological mechanism underlying musculoskeletal aging in HCH remains largely unknown. In this study, we show that Hch mice exhibit phenotypic traits of bone fragility and accelerated age-dependent articular cartilage and subchondral bone changes. Hch mice also presented decreased muscle strength and reduction in muscle fibers size. Furthermore, proteomics analyses of the cortical bone revealed that Hch mice follow a different aging trajectory than control. FGFR3 mutation leads to a premature boost of the mitochondrial processes forcing the mutant to reach a physiological state much earlier than the control. Together, these findings demonstrate that aging in Hch mice is accompanied by bone fragility and osteoarthritis-like changes. Proteomics analyses highlighted the key role for mitochondria in the cortical bone of Hch mice, providing insight into the mechanisms underlying premature aging in HCH.

Matching Claidex post-mortems

1 of 1 indexed

This is an automated contradiction flag, not an editorial judgment on the preprint's quality. Flags identify where the preclinical literature and the clinical failure record diverge.