Journal: bioRxiv
Article Title: Neuroligin-3 interaction with CSPG4 regulates normal and malignant glial precursors through PIEZO1
doi: 10.1101/2025.07.12.664340
Figure Lengend Snippet: a. Representative images of glioma cells colored based on the lifetime of fluorescent tension sensor FlippeR-TR. The fluorescence probe works by specifically targeting the plasma membrane, and the longer lifetime corresponds to increased membrane tension. b. Quantification of the lifetimes measured from the experiment shown in a. (n (number of independent biological samples used for imaging) = 6 – 10, mean ± s.e.m., two-tailed t-test, **** P < 0.0001, n.s. = not significant) c. Scatterplots depicting tumor architecture of scRNA-seq produced from molecularly distinct patient glioma samples. From left to right are Histone H3K27M mutated diffuse midline glioma (DMG) and IDH1 wild-type glioblastoma (GBM). PIEZO1 expression displayed in red across two classes of glioma. Note that PIEZO1 is detected within the OPC-like fraction of these distinct glioma types. d. left: Confocal image of immunostaining in SU-DIPGXIII-FL xenografted mouse brain slice. (PIEZO1 = red, GFP (marker for glioma cells) = green, scale bar = 10 µm) right: 3-dimensional reconstructions of glioma cell surface showing PIEZO1 localization. Patient-derived DIPG cells (SU-DIPGXIII-FL; nestin, blue) co-localize with PIEZO1 puncta (red). Scale bar, 3 µm. e. Workflow depicting treatment of glioma cells with recombinant NLGN3 ectodomains in the presence or absence of modulators of mechanosensitive ion channels (MSC) followed by culture medium concentration and western blot to detect shedding of CSPG4. f. Western blot of shed CSPG4 ectodomains from experiment depicted in c. Treatment with Yoda1 (PIEZO1 agonist), increases shedding relative to vehicle controls (p = 0.0464). In contrast, treating cells with MSC blockers gadolinium (Gd 3+ ) or the spider toxin GsMTx4 prevent NLGN3-induced shedding of CSPG4 (p = 0.0008 and p < 0.0001, respectively) Right : Quantification of western blots (n (independent biological replicates of western blot) = 11, mean ± s.e.m., ordinary one-way ANOVA, p-values are written on the figures. g. Model depicting CSPG4 shedding via ADAM10 activation that is downstream of NLGN3 interaction and ensuing membrane depolarization through PIEZO1 channel activation. Red circular sector = ADAM10; Green rectangle = shed NLGN3; blue = CSPG4 ectodomain; light blue = PIEZO1.
Article Snippet: DNA sequence encoding the signal peptide and ectodomain of human NLGN3 (Sino Biological NLGN3=HG11160-UT) and subsequently cloned into a mammalian cell expression vector (pD649) with AviTag and 6xHis Tag at the C-terminus.
Techniques: Fluorescence, Clinical Proteomics, Membrane, Imaging, Two Tailed Test, Produced, Expressing, Immunostaining, Slice Preparation, Marker, Derivative Assay, Recombinant, Concentration Assay, Western Blot, Activation Assay