Journal: bioRxiv
Article Title: VASH1 phosphorylation regulates tubulin detyrosination via CNP/PRKG1α signaling in DRG neurons
doi: 10.64898/2026.10.14.759141
Figure Lengend Snippet: (A) Representative confocal images of axon with growth cones stained for tyrosinated α-tubulin (Tyr, red), F-actin (phalloidin, magenta), and phosphorylated-VASH1 (P[S337]VASH1, gray). Scale bar, 10 µm. ( B ) Quantification of P[S337]VASH1 in growth cones of WT and Vash1 KO neurons. n/N: 67/5 (WT), 111/7 (KO) with n indicating the number of growth cones and N of E13 embryos. Data are expressed as mean ± SD and as fold change over WT. ( C ) Quantification of P[S337]VASH1 in growth cones without treatment or with CNP treatment. n/N: 61/4 (control), 48/3 (CNP) with n indicating the number of growth cones and N the number of E13 embryos. Data are expressed as mean ± SD and as fold change over control. Statistical significance was determined using Mann-Witney test. **** p < 0.0001, ns p > 0.05. ( D, E ) Detection by immunoblot of VASH1 protein and its phosphorylated form in cultured DRG neurons after immunoprecipitation using an anti-SVBP antibody. β-tubulin staining shows similar protein content in the immunoprecipitation inputs. ( D ) Both VASH1 protein and its phosphorylated form are detected in WT but not in Vash1 KO DRGs. Treatment with Lambda protein phosphatase results in the loss of P[S337]VASH1 band. ( E, F ) CNP induces phosphorylation of S337 of VASH1, which is reversed by DT-3, as shown by representative immunoblots from an experiment done with cultured DRG explants ( E ) and quantifications of the P[S337]VASH1/VASH1 ratios from 4 independent experiments ( F ). In F , triangles correspond to data from immunoprecipitation experiments done with cultured DRG dissociated neurons, and circle to immunoprecipitation experiments done with cultured DRG explants.
Article Snippet: For phosphatase treatment experiments, bead-bound complexes were incubated with phosphatase (Lambda protein phosphatase, New England Biolabs) for 30 min at 30°C according to the manufacturer’s protocol before elution.
Techniques: Confocal, Staining, Control, Western Blot, Cell Culture, Immunoprecipitation, Phospho-proteomics