Journal: Bioactive Materials
Article Title: ADGRG1-targeted hypoxia preconditioned extracellular vesicles ameliorate intervertebral disc degeneration by delivering taurine to disrupt the oxidative stress feedback loop-driven ferroptosis in nucleus pulposus cells
doi: 10.1016/j.bioactmat.2026.02.029
Figure Lengend Snippet: Taurine is the key small molecule in A1TP-HX-EVs that activated the AMPK/NRF2 pathway to regulate nucleus pulposus cell repair. (A) The LC-MS/MS analysis was used to detect the differential active small molecule components between placental HX-EVs and EVs. (B) The SMPDB enrichment analysis identified pathways related to small molecules that are up-expressed in HX-EVs compared to EVs. The metabolic pathways marked in red are related to ferroptosis inhibition and mitochondrial function. (C) Volcano plot of small molecule in HX-EVs versus EVs. |log2FC| > 0.5, FDR <0.05. (D) The content of taurine in placental MSC (pMSC), hypoxia-induced pMSC(HX-pMSC) and their derived EVs was detected by ELISA. n = 3. (E) Primary NPCs cells were induced with TBHP, and then treated with EVs, HX-EVs, and A1TP-HX-EVs for 24 h. The cell lysates were subjected to ELISA assay to detect taurine content. (F) Two shRNA lentiviruses were designed to knock down TAUT a key enzyme in taurine uptake in pMSC. (G) The content of taurine in TAUT-sh1-pMSC and TAUT-sh2-pMSC derived EVs (KD-HX-EVs) was detected by ELISA. n = 3. (H) Primary NPCs were induced with TBHP, and then treated with A1TP-HX-EVs and A1TP-KD-HX-EVs for 24 h. Cell lysates were immunoblotted with indicated antibodies. (I) Primary NPCs were induced with TBHP, and then treated with A1TP-HX-EVs and A1TP-KD-HX-EVs for 24 h, followed by immunofluorescent staining with anti- TOM20 (green) and anti-4-HNE (red) antibodies. n = 3. Scale bar, 50 μm. (J) A CDO1-overexpressing retrovirus was designed to overexpress CDO1 in pMSCs. (K) The content of taurine in CDO1-OE-pMSC derived EVs (OE-EVs) was detected by ELISA. n = 3. (L) Primary NPCs were induced with TBHP, and then treated with treated A1TP-EVs and A1TP-OE-EVs for 24 h. Cell lysates were immunoblotted with indicated antibodies. (M) Primary NPCs were induced with TBHP, and then treated with A1TP-EVs and A1TP-OE-EVs for 24 h, followed by immunofluorescent staining with anti-TOM20 (green) and anti-4-HNE (red) antibodies. n = 3. Scale bar, 50 μm. (N-O) Representative oxygen consumption traces of primary NPCs induced with TBHP and then treated with A1TP-HX-EVs, A1TP-KD-HX-EVs, or A1TP-OE-EVs for 24 h. Maximal respiration of NPCs were quantified. n = 3. All data are expressed as the mean ± SD. For E), I), M) and O), one‐way ANOVA with Tukey's multiple comparison tests were used for statistical analysis. For D), G) and K), two‐tailed unpaired Student's t‐tests were used for statistical analysis. ∗ P < 0.05. ∗∗ P < 0.01. ∗∗∗ P < 0.001. ns, not significant.
Article Snippet: Primary antibodies included FTH1(4393S, Cell Signaling Technology), COL1A1(72026T, Cell Signaling Technology), COL2A1(sc-52658, Santa Cruz Biotechnology), MMP13(ab39012, Abcam), GPX4(30388-1-AP, Proteintech), ADGRG1(sc-390192, Santa Cruz Biotechnology), TAUT (sc-393036, Santa Cruz Biotechnology), TonEBP (sc-101098, Santa Cruz Biotechnology), CDO1 (12589-1-AP, Proteintech), AMPK(10929-2-AP, Proteintech), Phospho-AMPK (Thr172)(2535T, Cell Signaling Technology), SIRT1(8469T, Cell Signaling Technology), P-SIRT1(Ser47)(2314S, Cell Signaling Technology), PGC-1α(2178S, Cell Signaling Technology), Ac-lysine(sc-81623, Santa Cruz Biotechnology), NRF2(16396-1-AP, Proteintech), TFAM(22586-1-AP, Proteintech), NCOA4(66849S, Santa Cruz Biotechnology).
Techniques: Liquid Chromatography with Mass Spectroscopy, Inhibition, Derivative Assay, Enzyme-linked Immunosorbent Assay, shRNA, Knockdown, Staining, Comparison, Two Tailed Test
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