Journal: bioRxiv
Article Title: Deleting PTEN, but not SOCS3 or myelin inhibitors, robustly boosts BRAF-elicited intraspinal regeneration of peripheral sensory axons
doi: 10.1101/2024.09.18.613685
Figure Lengend Snippet: (A) A schematic diagram of the experimental procedure for 3 week analysis of all transgenic lines. Boxed area specifies region of interest in the spinal cord. (B) tdTomato expression indicates high transgene activation within sensory neurons and afferent projections of the dorsal horn and dorsal columns. Scale bar: 200 μm , 100 μm . (C) Western blot analysis confirms expression of BRAF V600E in kaBRAF iTg but not WT DRG lysates. Total B-RAF protein levels remain unchanged. Molecular mass is noted in kilodaltons. Cross sections of WT (D-D”) or kaBRAF iTg (E-E”’) groups show GFP-labeled axon regeneration at 3 weeks after DR crush injury. WT show spontaneous regeneration along the DR but no regeneration past the DREZ. (E”’, inset) kaBRAF expression promotes axon regeneration across the DREZ and into the superficial laminae of the spinal cord. GFAP staining denotes the astrocytic boundary of the CNS. Dotted line indicates the relative area of the DREZ. (F) Quantification of axon growth shows significantly more axons penetrate the DREZ in kaBRAF iTg than in WT controls. Scale bar: D-E” =100 μm, E”’ = 50 μm. n=4-5 mice per group, at least 5-6 sections per mouse, **** P < 0.0001, ** P < 0.01, two-way ANOVA with Sidak’s multiple comparisons test. Values represent mean ±SEM.
Article Snippet: Antibodies used were mouse anti-BRAF V600E (1:1000, Spring Bioscience), rabbit anti-BRAF (1:1000, Cell Signaling #9433), rabbit anti-PTEN (1:1000, Cell Signaling, #9559), rabbit anti-pS6 (1:1000, Cell Signaling #2215), rabbit anti-survivin (1:1000, CST #2808), and mouse anti-β-actin (1:5000, Sigma, A5441).
Techniques: Transgenic Assay, Expressing, Activation Assay, Western Blot, Labeling, Staining