Delivery of miR-15b-5p via magnetic nanoparticle-enhanced bone marrow mesenchymal stem cell-derived extracellular vesicles mitigates diabetic osteoporosis by targeting GFAP.

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This study aimed to investigate the potential of magnetic nanoparticle-enhanced extracellular vesicles (GMNPE-EVs) derived from bone marrow mesenchymal stem cells (BMSCs) to deliver miR-15b-5p, thereby targeting and downregulating glial fibrillary acidic protein (GFAP) expression in rat DO models. Data was sourced from DO-related RNA-seq datasets combined with GEO and GeneCards databases. Rat primary BMSCs, bone marrow-derived macrophages (BMMs), and osteoclasts were isolated and cultured. EVs were separated, and GMNPE targeting EVs were synthesized. Bioinformatic analysis revealed a high GFAP expression in DO-related RNA-seq and GSE26168 datasets for disease models. Experimental results confirmed elevated GFAP in rat DO bone tissues, promoting osteoclast differentiation. miR-15b-5p was identified as a GFAP inhibitor, but was significantly downregulated in DO and enriched in BMSC-derived EVs. In vitro experiments showed that GMNPE-EVs could transfer miR-15b-5p to osteoclasts, downregulating GFAP and inhibiting osteoclast differentiation. In vivo tests confirmed the therapeutic potential of this approach in alleviating rat DO. Collectively, GMNPE-EVs can effectively deliver miR-15b-5p to osteoclasts, downregulating GFAP expression, and hence, offering a therapeutic strategy for rat DO.", "claims": [{"id": "claim-method", "statement": "Differentially expressed genes (DEGs) in two datasets were identified using the \"limma\" package (Ritchie et al. 2015) of R software and a threshold of P value < 0.05 and |log10FC|> 1.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:38967699", "locator": "sections[5] \"Bioinformatics analysis\" paragraph 2", "quote": "Differentially expressed genes (DEGs) in two datasets were identified using the \"limma\" package (Ritchie et al. 2015) of R software and a threshold of P value < 0.05 and |log10FC|> 1."}], "state": "complete"}, {"id": "claim-data-access", "statement": "No datasets were generated or analysed during the current study.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:38967699", "locator": "sections[35] \"Data availability\" paragraph 2", "quote": "No datasets were generated or analysed during the current study."}], "state": "complete"}, {"id": "claim-target-result", "statement": "GMNPE-EVs effectively deliver miR-15b-5p to osteoclasts, downregulate GFAP expression, and thereby offer a therapeutic strategy for diabetic osteoporosis in rats.", "kind": "qualitative", "target": null, "evidence": [{"asset": "source:pmid:38967699", "locator": "sections[0] \"Abstract\" paragraph 1", "quote": "Collectively, GMNPE-EVs can effectively deliver miR-15b-5p to osteoclasts, downregulating GFAP expression, and hence, offering a therapeutic strategy for rat DO."}], "state": "complete"}], "gaps": []}, "experiment": {"state": "complete", "objective": "GMNPE-EVs effectively deliver miR-15b-5p to osteoclasts, downregulate GFAP expression, and thereby offer a therapeutic strategy for diabetic osteoporosis in rats.", "steps": [{"id": "read_published_estimate", "order": 1, "name": "Read the published estimate from the source", "kind": "other", "state": "complete", "blocked_on": null, "description": "The claim, method and evidence span published with the source article.", "duration_hours": null, "parameters": {}, "inputs": ["source:pmid:38967699"], "outputs": ["the published estimate and its evidence"], "instruments": [], "reagents": []}, {"id": "obtain_source_data", "order": 2, "name": "Obtain the source data from the named repository", "kind": "data-preparation", "state": "complete", "blocked_on": null, "description": "The GEO series accession resolves and its sample accessions are listed. 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