What this means
Researchers treated aging rat bone cells in a lab dish with a plant extract and watched cell changes. This work was done in cells and animals, so it does not show the extract would help people.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- Rat bone marrow stem cells in a lab dish
- Kind of research
- Research in animals or cells
The science
- Original title
- Polygonatum sibiricum polysaccharide attenuates BMSC senescence by inhibiting NCOA4-mediated ferritinophagy.
- Authors
- Dai X, Wang L, Sun Y et al.
- Journal
- Pharmaceutical biology
- Published
- Oct 14, 2026
- Study type
- Lab or animal study · indexed as animal research
- PMID
- 42872690 ↗
Abstract
Background
BMSC senescence is associated with osteoporosis progression. Polygonatum sibiricum polysaccharide (PSP) shows potential anti-senescence activity, but its effects on bone marrow mesenchymal stem cells (BMSCs) remain unclear. To investigate the protective effects and molecular mechanisms of PSP against tert-butyl hydroperoxide (TBH)-induced senescence in BMSCs.
What they did
Senescence was induced in primary rat BMSCs with TBH, followed by PSP intervention. Viability was assessed using the Cell Counting Kit-8 assay, while senescence-associated β-galactosidase, alkaline phosphatase, and Oil Red O staining assessed senescence and osteogenic/adipogenic differentiation. Ferritinophagy-associated proteins (NCOA4, FTH1, and LC3) and intracellular Fe2+ were quantified using western blot, immunofluorescence, and FerroOrange staining. Mitochondrial function was evaluated using MitoSOX and JC-1 assays and ATP quantification. Cytosolic mtDNA accumulation and the cGAS-STING pathway were assessed using immunofluorescence colocalization, quantitative polymerase chain reaction, and Western blotting. NCOA4 involvement was examined using an NCOA4-overexpressing lentiviral vector.
What they found
PSP concentration-dependently attenuated TBH-induced senescence phenotypes in BMSCs, partially restored osteogenic differentiation, and reduced adipogenic differentiation. PSP downregulated NCOA4 expression, attenuating ferritinophagy-associated changes and intracellular Fe2+ accumulation. Reduced Fe2+ accumulation preserved mitochondrial membrane potential, reduced mitochondrial reactive oxygen species generation, and reduced cytosolic mtDNA accumulation, alongside attenuated cGAS-STING signaling. Lentiviral overexpression of NCOA4 attenuated the protective effects of PSP on mitochondrial homeostasis and cGAS-STING pathway suppression. PSP may attenuate BMSC senescence by suppressing NCOA4-mediated ferritinophagy, thereby preserving mitochondrial homeostasis and inhibiting cGAS-STING signaling. These findings provide a rationale for further investigation of PSP as a potential therapeutic strategy for osteoporosis-associated BMSC dysfunction.
The authors' abstract, grouped under plain headings from its own section labels.
Dai X, Wang L, Sun Y et al. Polygonatum sibiricum polysaccharide attenuates BMSC senescence by inhibiting NCOA4-mediated ferritinophagy. Pharmaceutical biology. 2026. doi:10.1080/13880209.2026.2746259. PMID: 42872690. https://pubmed.ncbi.nlm.nih.gov/42872690/