NAMPT in osteoarthritic synovium and aging-related muscle: tissue-dependent associations
In this retrospective transcriptomic analysis, NAMPT abundance was lower in both tissue contexts, with partial external support; disease-adjusted associations with inflammatory and glycolytic programs were stronger in osteoarthritic synovium than in aging-related skeletal muscle proxy cohorts. [1]
Automatic summary · not editorially reviewed
The key findings
Discovery used knee osteoarthritis synovium cohorts GSE55235 and GSE55457 and aging-related skeletal muscle proxy cohorts GSE38718 and GSE25941. [1]
In the discovery stage, NAMPT showed a downward abundance signal in both tissue contexts, and meta-analytic pooling in knee osteoarthritis synovium was limited by between-study heterogeneity. [1]
Disease-adjusted coupling analyses indicated stronger NAMPT associations with inflammatory and glycolytic programs in osteoarthritic synovium, whereas aging-related muscle proxy cohorts showed weaker immune coupling and a pattern more consistent with metabolic deficit. [1]
The source at a glance
- Study type / format
- Retrospective multi-cohort transcriptomic analysis (abstract)
- Population / context
- Public transcriptomic datasets: knee osteoarthritis synovium cohorts and aging-related skeletal muscle proxy cohorts, plus external disease-relevant cohorts including a clinically phenotyped sarcopenia cohort.
- Summary based on
- Study abstract
- Original publication
- July 28, 2026
Public datasets comparing synovium and muscle NAMPT
The authors asked whether NAMPT sits in comparable transcriptomic contexts in osteoarthritic synovium and skeletal muscle. They ran a retrospective multi-cohort transcriptomic analysis of public GEO datasets, with separate discovery and external supporting stages. Discovery used knee osteoarthritis synovium cohorts GSE55235 and GSE55457 and aging-related skeletal muscle proxy cohorts GSE38718 and GSE25941. Muscle findings were explicitly kept separate from the clinically phenotyped sarcopenia external-support cohort. NAMPT abundance was assessed by differential expression and effect-size synthesis, pathway activity by single-sample gene set enrichment, and association structure by disease-adjusted partial correlations.
Supporting source [1]
Lower NAMPT signal with partial external support
In the discovery stage, NAMPT showed a downward abundance signal in both tissue contexts. Meta-analytic pooling in knee osteoarthritis synovium was limited by between-study heterogeneity. External datasets gave partial support: lower NAMPT expression in disease-relevant synovium in GSE12021 and in clinically phenotyped sarcopenia muscle in GSE111016, while GSE254682 showed the same direction without statistical significance. Disease-adjusted coupling analyses indicated that osteoarthritic synovium retained stronger NAMPT associations with inflammatory and glycolytic programs, whereas the aging-related muscle proxy cohorts showed weaker immune coupling and a pattern more consistent with metabolic deficit.
Supporting source [1]
Stability, secondary analyses and observational scope
Cohort-stratified stability analyses suggested directionally consistent associations in osteoarthritic synovium but weaker and more heterogeneous ones in the muscle proxy cohorts. A reduced external association analysis showed partial module-level consistency, including preserved inflammatory linkage in GSE254682 and a more oxidative-phosphorylation-oriented pattern in GSE111016. Exploratory cohort-level separation analyses and therapeutic inference were secondary and were not interpreted as evidence of clinical utility or efficacy. The authors favor context-specific interpretation and targeted experimental follow-up rather than uniform extrapolation across tissues.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is a retrospective analysis of public transcriptomic datasets with discovery and external supporting stages; external support was partial, one external dataset showed the same direction without statistical significance, synovium pooling was limited by between-study heterogeneity, and muscle proxy cohorts were weaker and more heterogeneous. Exploratory and therapeutic inference analyses were secondary and not evidence of clinical utility or efficacy. Associations are not causes.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
He Q, Qin W, Yu X, Jing L, Yan Q. · europepmc.org · July 28, 2026