125i labeled tau  (R&D Systems)

Journal: Frontiers in Genetics

Article Title: miR-18a-5p promotes phenotypic transformation of airway smooth muscle cells by targeting SPRY1 to activate the RAS-MAPK pathway

doi: 10.3389/fgene.2026.1760431

Figure Lengend Snippet: Upregulation of miR-18a-5p in asthma and its role in promoting ASMC proliferation and migration upon TGF-β1 stimulation. (A) RT-qPCR revealed that miR-18a-5p levels were significantly higher in sputum from asthma patients compared with healthy controls (n = 10). (B) TGF-β1 stimulation induced a dose-dependent increase in miR-18a-5p expression in ASMCs (n = 3). (C) PDGF-BB stimulation significantly altered miR-18a-5p expression in ASMCs in a concentration-dependent manner (n = 3). (D) miR-18a-5p was effectively overexpressed or silenced in ASMCs following transfection with mimics or inhibitors (n = 3). (E) CCK-8 assay showed altered cell viability under different miR-18a-5p expression levels (n = 3). (F) Transwell assay demonstrated that miR-18a-5p regulates the migratory capacity of ASMCs (n = 3). Data are presented as mean ± SD. **p < 0.01 vs. healthy, 0 ng/mL, or Control group; ##p < 0.01 vs. TGF-β1+in-NC or PDGF-BB 5 ng/mL group; &&p < 0.01 vs. TGF-β1+mi-NC or PDGF-BB 10 ng/mL group.

Article Snippet: Solid recombinant human TGF-β1 protein was purchased from MedChemExpress (United States).

Techniques: Migration, Quantitative RT-PCR, Expressing, Concentration Assay, Transfection, CCK-8 Assay, Transwell Assay, Control

Journal: Frontiers in Genetics

Article Title: miR-18a-5p promotes phenotypic transformation of airway smooth muscle cells by targeting SPRY1 to activate the RAS-MAPK pathway

doi: 10.3389/fgene.2026.1760431

Figure Lengend Snippet: miR-18a-5p regulates migration-associated proteins in TGF-β1-stimulated ASMCs. Representative Western blot images and quantitative analysis showed the expression levels of Integrin β1, p-FAK, total FAK, p-Paxillin, total Paxillin, and MMP9. α-Tubulin was used as a loading control. Data are presented as mean ± SD (n = 3). ***p < 0.001 vs. Control group; ###p < 0.001 vs. TGF-β1+in-NC group; &&&p < 0.001 vs. TGF-β1+mi-NC group.

Article Snippet: Solid recombinant human TGF-β1 protein was purchased from MedChemExpress (United States).

Techniques: Migration, Western Blot, Expressing, Control

Journal: Frontiers in Genetics

Article Title: miR-18a-5p promotes phenotypic transformation of airway smooth muscle cells by targeting SPRY1 to activate the RAS-MAPK pathway

doi: 10.3389/fgene.2026.1760431

Figure Lengend Snippet: miR-18a-5p modulates the expression of structural proteins in TGF-β1-induced ASMCs. (A,B) Immunofluorescence staining of α-SMA and Collagen I in ASMCs subjected to different treatments. (C) Representative Western blot images of OPN, α-SMA, Calponin, Collagen I, and Collagen III in ASMCs following different interventions. (D) Quantitative analysis of protein expression levels based on Western blot results. Data are presented as mean ± SD (n = 3). **p < 0.01 vs. Control group; ##p < 0.01 vs. TGF-β1+in-NC group; &&p < 0.01 vs. TGF-β1+mi-NC group.

Article Snippet: Solid recombinant human TGF-β1 protein was purchased from MedChemExpress (United States).

Techniques: Expressing, Immunofluorescence, Staining, Western Blot, Control

Journal: Frontiers in Genetics

Article Title: miR-18a-5p promotes phenotypic transformation of airway smooth muscle cells by targeting SPRY1 to activate the RAS-MAPK pathway

doi: 10.3389/fgene.2026.1760431

Figure Lengend Snippet: miR-18a-5p enhances RAS-MAPK pathway activation in TGF-β1-induced ASMCs. (A) Representative Western blot images of KRAS, MEK1/2, p-MEK1/2, ERK1/2, and p-ERK1/2 protein levels in ASMCs subjected to different treatments. (B) Quantitative analysis of protein expression based on Western blot results. Data are presented as mean ± SD (n = 3). **p < 0.01 vs. Control group; ##p < 0.01 vs. TGF-β1+in-NC group; &&p < 0.01 vs. TGF-β1+mi-NC group.

Article Snippet: Solid recombinant human TGF-β1 protein was purchased from MedChemExpress (United States).

Techniques: Activation Assay, Western Blot, Expressing, Control

Journal: Frontiers in Genetics

Article Title: miR-18a-5p promotes phenotypic transformation of airway smooth muscle cells by targeting SPRY1 to activate the RAS-MAPK pathway

doi: 10.3389/fgene.2026.1760431

Figure Lengend Snippet: miR-18a-5p targets and negatively regulates SPRY1 (A) RT-qPCR analysis of SPRY1 expression in sputum samples from asthma patients and healthy controls (n = 10). (B) Correlation analysis of the relationship between miR-18a-5p and SPRY1 expression levels. (C) RT-qPCR analysis of SPRY1 mRNA expression in ASMCs under different treatment conditions (n = 3). (D) Western blot analysis of SPRY1 protein expression in ASMCs following different interventions (n = 3). (E) Bioinformatic prediction of the putative binding site between miR-18a-5p and the SPRY1 3′UTR. (F) Dual-luciferase reporter assay confirming the direct interaction between miR-18a-5p and SPRY1 (n = 3). Data are presented as mean ± SD. **p < 0.01, ***p < 0.001 vs. healthy, Control or WT + NC-mimics group; ##p < 0.01 vs. TGF-β1+in-NC group; &&p < 0.01 vs. TGF-β1+mi-NC group.

Article Snippet: Solid recombinant human TGF-β1 protein was purchased from MedChemExpress (United States).

Techniques: Quantitative RT-PCR, Expressing, Western Blot, Binding Assay, Luciferase, Reporter Assay, Control

Journal: Frontiers in Genetics

Article Title: miR-18a-5p promotes phenotypic transformation of airway smooth muscle cells by targeting SPRY1 to activate the RAS-MAPK pathway

doi: 10.3389/fgene.2026.1760431

Figure Lengend Snippet: miR-18a-5p promotes TGF-β1-induced phenotypic transformation of ASMCs by targeting SPRY1 and activating the RAS-MAPK signaling pathway. (A) Western blot analysis of SPRY1 protein expression in ASMCs under different treatment conditions. (B) Western blot analysis of KRAS, MEK1/2, p-MEK1/2, ERK1/2, and p-ERK1/2 in ASMCs following different interventions. (C) CCK-8 assay evaluating ASMC viability under various treatment conditions. (D) Transwell assay assessing the migration capacity of ASMCs after different treatments. (E) Western blot analysis of OPN, α-SMA, Calponin, Collagen I, and Collagen III protein levels in ASMCs under different conditions. Data are presented as mean ± SD (n = 3). **p < 0.01 vs. si-NC or TGF-β1 group; ##p < 0.01 vs. TGF-β1+in-miR group; &&p < 0.01 vs. TGF-β1+si-SPRY1 group.

Article Snippet: Solid recombinant human TGF-β1 protein was purchased from MedChemExpress (United States).

Techniques: Transformation Assay, Western Blot, Expressing, CCK-8 Assay, Transwell Assay, Migration

Journal: bioRxiv

Article Title: IR-AMES uncovers structure and composition of Alzheimer’s tau oligomers

doi: 10.64898/2026.03.12.711458

Figure Lengend Snippet: a, Schematic of oligomerization from recombinant human 2N4R human tau monomers (rTauM) to oligomers (rTauO) and imaging workflow. b, Amide-I band intensity histograms of rTauM (green) and rTauO (orange) particles with Gaussian fits ( n = 200 for each). c, Amide-I band intensity versus apparent oligomer order (rTauM, green; rTauO, orange). Order 1 corresponds to the rTauM population. Data points represent the mean of each peak in b . Error bars indicate the fitted Gaussian FWHM. d–e, Heatmaps of IR-AMES spectra from monomers ( d ) and oligomers ( e ), sorted by integrated intensity. Cartoons illustrate that monomers, although structurally dynamic, remain predominantly random coil, whereas oligomers exhibit more heterogeneous secondary structures. Detailed conformations predicted by AlphaFold3 are provided in the Supplementary Note 5 and Supplementary Fig. 13. f, Quantification of fitted spectral components obtained from Lorentzian deconvolution of the amide-I band (see Extended Data Fig. 4 for representative fitting examples). Monomers show a narrow distribution dominated by random-coil features, whereas oligomers exhibit a broader heterogeneity with increased β-sheet structures. All groups were expressed as mean ± s.d. g, Representative average spectra for monomers (green) and oligomers (orange). Solid lines: mean spectra, shaded regions: standard deviation. Ensemble averages show minimal spectral differences, highlighting that conformational diversity is primarily resolved in IR-AMES.

Article Snippet: Recombinant human tau protein was purchased from R&D Systems, Inc (SP-495).

Techniques: Recombinant, Imaging, Standard Deviation

Journal: bioRxiv

Article Title: IR-AMES uncovers structure and composition of Alzheimer’s tau oligomers

doi: 10.64898/2026.03.12.711458

Figure Lengend Snippet: a, Recombinant human 2N4R tau monomers (rTauM). b, Recombinant human 2N4R tau oligomers (rTauO). Each spectrum was normalized to 0–1 and decomposed into five secondary-structure components within the amide-I region: parallel β-sheet, random coil, α-helix, β-turn, and antiparallel β-sheet. Colored areas represent the contribution of each component, and solid black lines represent the fitted total spectrum. The integrated areas of these components were used to generate the single-particle structural distributions shown in .

Article Snippet: Recombinant human tau protein was purchased from R&D Systems, Inc (SP-495).

Techniques: Recombinant, Single Particle

Journal: bioRxiv

Article Title: IR-AMES uncovers structure and composition of Alzheimer’s tau oligomers

doi: 10.64898/2026.03.12.711458

Figure Lengend Snippet: a, Atomic force microscopy images of Alzheimer’s disease patient derived tau oligomers (AD TauO) and fibrils (AD TauF). Scale bars: 250 nm. AD TauO appear as spherical or ellipsoidal particles wih heights of 5–8 nm and lateral dimensions of ∼40 nm. AD TauF appear as short fragmented rods with heights of ∼10 nm, lateral widths of ∼30–50 nm, and lengths ranging from 100 to 500 nm. Dimensions were measured along the white dashed lines, details are provided in Supplementary Fig. 14. b–c, Cytotoxicity of iPSC-derived neurons treated with human tau for 24 h, quantified by LDH release ( b ) and cleaved caspase-3–positive area relative to TUJ1 ( c ). n = 6. Data were expressed as mean ± s.d. Column means were compared using two-way ANOVA, with ****p < 0.0001. d, IR-AMES image of AD TauO and age-matched normal human derived tau oligomers (Ctrl TauO) at the amide-I band. Scale bars: 1 µm. e, Heatmaps of IR-AMES spectra from AD TauO and Ctrl TauO, n = 150. Spectra were normalized to 0–1. f–g, IR-AMES image of AD TauO and Ctrl TauO at the antiparallel β-sheet channel ( f ) and RNA channel ( g ). Scale bars: 1 µm. h–j, Heatmaps of IR-MAES spectra from AD TauO with endonuclease benzonase (AD TauO w/Benz) treatment ( h ), AD TauF ( i ) and normal human derived tau fibrils (Ctrl TauF) ( j ), n = 150. Spectra were normalized to 0–1. k, Quantification of antiparallel β-sheets and RNA content from human tau in e and h–j . Values were derived from Lorentzian deconvolution of the amide-I region (see Extended Data Fig. 6 for representative fits). All groups were expressed as mean ± s.d. Column means were compared using one-way ANOVA, with ****p < 0.0001, and ns for not significance. l, t-SNE visualization of all spectra from individual tau assemblies, revealing structure-dependent clustering patterns. Each dot indicates a single-particle spectrum.

Article Snippet: Recombinant human tau protein was purchased from R&D Systems, Inc (SP-495).

Techniques: Microscopy, Derivative Assay, Single Particle

Journal: bioRxiv

Article Title: IR-AMES uncovers structure and composition of Alzheimer’s tau oligomers

doi: 10.64898/2026.03.12.711458

Figure Lengend Snippet: a ,: Schematic illustrating the co-incubation of human-derived tau aggregates with lipid nanodiscs (NDs) to form tau–ND complexes for IR-AMES imaging. b, Representative IR-AMES images of NDs composed of phosphatidylcholine and phosphatidylserine (PC+PS) or PC only, shown for integrated amide-I and lipid signals. Scale bars, 1 µm. c, Heatmaps of IR-AMES spectra from ND (PC+PS) ( n = 119) and ND (PC) ( n = 165). Spectra were normalized to 0–1 and ordered by lipid intensity. d, Average spectra of NDs. Solid lines: mean spectra, shaded regions: standard deviation. e, Representative images of AD TauO and Ctrl TauO following NDs incubation. Scale bars, 1 µm. f, Heatmaps of spectra from AD TauO–ND (PC+PS) ( n = 225), AD TauO–ND (PC) ( n = 115), and Ctrl TauO–ND (PC+PS) ( n = 140), highlighting distinct protein secondary-structure and lipid-associated spectral features. Spectra for AD TauO–ND spectra were ordered by antiparallel β-sheet contribution. g, Average spectra of lipid-poor ( n = 25) and lipid-enriched ( n = 25) subsets derived from f , compared with tau aggregates alone ( n = 150 for each). Spectra were normalized to 0–1 and vertically offset for display in d and g . h, Quantification of antiparallel β-sheet and lipid contributions from IR-AMES spectra using Lorentzian fitting. All groups were expressed as mean ± s.d. Column means were compared using one-way ANOVA, with ****p < 0.0001, and ns for not significance. i, Single-particle correlation analysis of lipid content and antiparallel β-sheet contribution in AD TauO–ND (PC+PS), revealing a moderate negative correlation (Pearson’s r = –0.56). j, 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence spectra of human tau ( n = 3, solid lines: mean spectra, shaded regions: standard deviation), indicating enhanced surface hydrophobicity of AD TauO relative to controls.

Article Snippet: Recombinant human tau protein was purchased from R&D Systems, Inc (SP-495).

Techniques: Incubation, Derivative Assay, Imaging, Standard Deviation, Single Particle, Fluorescence