Journal: Journal of Translational Autoimmunity

Article Title: T cell proliferative response to a homocitrullinated peptide correlates with joint pathology in collagen induced arthritis

doi: 10.1016/j.jtauto.2025.100345

Figure Lengend Snippet: Citrullinated and Homocitrullinated Proteins/Peptides are Present in DBA/1J Metatarsophalangeal Joints. A) Representative hematoxylin + eosin (H&E) at 80× magnification and immunofluorescent micrographs at 20× magnification of joints from DBA/1J mice immunized with bovine type II collagen (arthritic: N = 9; non-arthritic: N = 10) or PBS (N = 9). Scale bars represent 500 μm. Max projections of Z-stacks show nuclei (DAPI; blue), citrullinated proteins/peptides (CitP; green), and homocitrullinated proteins/peptides (HomoCitP; red). Corrected total fluorescence intensity for B) CitP and C) HomoCitP in three joint structures: bone marrow, synovium, and cartilage. Graphs show the median [IQR], with each symbol representing an individual mouse. Statistical analysis was performed using Kruskal-Wallis with Dunn's multiple comparisons test, and the resulting p-values were p = 0.0046, p = 0.0084, p = 0.4076, p = 0.0143, p = 0.0136, and p = 0.1733 respectively, with p-values for pairwise comparisons indicated on the graphs. ns: not significant.

Article Snippet: Following application of TrueView autofluorescence quencher, slides were mounted using Vectashield Vibrance Antifade mounting media with DAPI (SP-8500-15; Vector Laboratories; USA) and air dried for 2 h before imaging on the Nikon Ti2-E microscope.

Techniques: Fluorescence

Journal: bioRxiv

Article Title: Satellite Glial Cells Control Sensory Neuron Excitability via the Release of Fibulin-2

doi: 10.64898/2026.02.13.705760

Figure Lengend Snippet: A. Representative images of DRG sections from WT and Fibulin-2 KO mice immunostained for Fibulin-2, FABP7, TUJ1, and DAPI. Scale bar 50μm. Two DRG sections from n=3 mice were imaged for each group. B. Super-resolution imaging of DRG tissue section highlighting the subcellular localization of Fibulin-2 in SGCs near the perinuclear region. Fibulin-2 (Red), FABP7 (White), TUJ1 (Green), and DAPI (Blue). Scale bar 2μm C. Electron micrograph of DRG sections showing the portion of an SGC covering the neuron soma. The SGC cytoplasm contains multivesicular bodies (white arrow), vesicle fusion/budding at the plasma membrane (red arrow), and a Golgi apparatus (asterisk). Scale bar 1μm D. Immunofluorescence of DRG section showing localization of Fibulin-2 in SGCs (labeled for Fabp7 or PDPN) surrounding neurons labeled with NeuN, NF200, TRPV1, TH, TRKA, and IB4. Scale bar 50μm. E. Quantification of the size distribution of the indicated DRG neurons subtypes. The size of neurons surrounded by Fibulin-2 positive SGC is indicated by a red dotted line. A total of 8956 neurons were analyzed from n=7 mice, with three DRG sections per mice. F. Quantification of the percentage of neuronal subtype surrounded by Fibulin-2-positive SGCs. Each data point in the bar graph represents an independent biological replicate. NF200 (n=5 mice), TRPV1 (n=5 mice), TRKA (n=3 mice), IB4 (n=4 mice), TH (n=4). Two sections from each biological replicate were imaged and used for quantification. Error bars represent SEM.

Article Snippet: Sections were mounted and coverslipped using VECTASHIELD anti-fade mounting media with DAPI (Vector Laboratory, Cat# H-2000).

Techniques: Imaging, Clinical Proteomics, Membrane, Immunofluorescence, Labeling

Journal: bioRxiv

Article Title: Satellite Glial Cells Control Sensory Neuron Excitability via the Release of Fibulin-2

doi: 10.64898/2026.02.13.705760

Figure Lengend Snippet: A . Voltage protocols for measurement of different types of K + currents: total ( I Total ), K-type ( I K ) and A-type ( I A ) K + currents. B . Sample traces of voltage-dependent K + currents I total (left), I K (middle) and I A (right) evoked by the protocols in ( A ) from Control (upper panel) and rFibulin-2 treated DRG cells (lower panel). C . rFibulin-2 increases voltage-dependent K + currents I Total (left), I K (middle) and I A (right) in DRG cells. Insert bar graphs are K + currents at membrane potential of -10 mV (around voltage threshold level), indicating that rFibulin-2 decreases excitability mainly mediated by enhancement of I A conductance, which reduces input resistance. Number of cells tested from 3 independent experiments: control n = 10; rFibulin-2: n = 8. D . Phrixotoxin-1 (PaTx1) was used to isolate Kv4 current evoked by voltage ramp (-100 to +20 mV, 100 mV/s). Sample traces of ramp-evoked K + currents before (a) and during (b) application of PaTx1, and the PaTx1-sensitive current (c, c = a - b). Currents were normalized to membrane capacitance for better comparison. E . I-V curves were constructed from the ramp-evoked Kv4 current (mean current value over 0.1 mV intervals from averages of five trials for each cell to approximate quasi-steady-state current). Note PaTx1 significantly increases the Kv4 current when the membrane potentials are depolarized to positive values greater than -25 mV. Number of cells tested from 3 independent experiments: control n = 6; rFibulin-2: n = 6; T-test; * P < 0.05; ** P < 0.01. F . Representative western blot of control and Fibulin-2 KO DRG lysate analyzed for Fibulin-2 and Kv4.2. GAPDH is used as a loading control. G . Quantification of Kv4.2 expression in control and Fibulin-2 KO mice. n=3 WT and n=3 Fibulin-2 KO mice. T-test; ** P < 0.01. H . Representative western blot of control and Fibulin-2 KO DRG lysate analyzed for Fibulin-2 and Kv4.3. GAPDH is used as a loading control. I . Quantification of Kv4.3 expression in control and Fibulin-2 KO mice. n=3 WT and n=3 Fibulin-2 KO mice. T-test; *** P < 0.001 J . Fibulin-2 KO mice show hypersensitivity to mechanical stimuli compared to controls, measured by the Von Frey Test. 12 WT and 8 Fibulin-2 KO mice were used. Two-Way Anova. ∗p < 0.05, ∗∗p < 0.01, ***p<0.001. K . Fibulin-2 KO mice exhibit hypersensitivity to heat stimuli compared to controls, measured by the Hot-Plate test. 12 WT and 8 Fibulin-2 KO mice were used. Two-Way Anova. ∗p < 0.05, ∗∗p < 0.01, ***p<0.001. L . Fibulin-2 KO mice exhibit hypersensitivity to cold stimuli compared to controls, measured by the Cold-Plate test. 12 WT and 8 Fibulin-2 KO mice were used. Two-Way Anova. ∗p < 0.05, ∗∗p < 0.01, ***p<0.001. M . Representative immunofluorescence images of the hindpaw of control and Fibulin-2 KO mice immunostained for PGP9.5 (white) and DAPI (blue). Three sections from n=3 mouse per group were used. N . Quantification of intraepidermal nerve fiber density (IENFD). n=3 mice per genotype. T-test, ns- non-significant

Article Snippet: Sections were mounted and coverslipped using VECTASHIELD anti-fade mounting media with DAPI (Vector Laboratory, Cat# H-2000).

Techniques: Control, Membrane, Comparison, Construct, Western Blot, Expressing, Hot Plate Test, Immunofluorescence