Fig. 2 Lkb1 is essential for the development of several neural crest derivatives. Lkb1 is essential for the development of several neural crest derivatives.

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Fig. 2 Lkb1 is essential for the development of several neural crest derivatives. Lkb1 is essential for the development of several neural crest derivatives. (A) Staining with Lkb1 antibody of back skin sections of P6 WT or Lkb1-inactivated (cKO). (B) Cre expression in migrating melanoblasts visualized by X-Gal staining of E15.5 embryos. (C) Staining for dopachrome tautomerase (DCT), one enzyme of melanin biosynthesis on skin sections. (D) Staining with Lkb1 D60C5 antibody (Cell Signaling) of myenteric ganglia in P21 mice in WT (arrows) and cKO animals. Ganglia are surrounded by dotted lines in the intestine and zooms are shown below. (E) Whole-mount Tuj1 labeling at birth (P0) on digestive tract from WT or Lkb1 cKO animals [proximal (PI) and distal (DI) intestine; proximal (PC) and distal (DC) colon]. (F) Representative images of marked loss of enteric ganglia observed by whole-mount AChE staining of the enteric nervous system at P21. (G) Neural (Tuj1) staining on swiss-roll sections of the intestine and colon (WT, n = 7; cKO, n = 12). (H) Histograms indicating the average number of Dapi+Tuj1+ cells per millimeter of tunica muscularis in the distal intestine and distal colon. cKO animals with unaffected neuronal density (Unaf.), hypoganglionosis (Hypog.), or hyperplasia (Hyperp.) are plotted separately. Increased density of Tuj1-positive cells due to ganglia hyperplasia was observed in the distal colon of two of eight cKO analyzed. (I) Longitudinal sections of sciatic nerves of WT and Lkb1 cKO mice at P6 (left) and P21 (right) immunostained with Lkb1 antibody. (J) Electron microscopy of sciatic nerves of P21 WT (a and b) and Lkb1 cKO mice (c to f) showing myelinated nerve fibers (a and c) and unmyelinated axons in Remak bundles (b, d, and e). Sections of cKO nerves show aberrantly unsegregated axons of small to large diameter (d and e) and axonal sorting defects (e and f). Scale bars, 10 μm (a and c), 2 μm (e and f), and 1 μm (b and d). (K) Scatter plot of g-ratio values with linear regressions in sciatic nerves of WT (blue, n = 400 axons, 2 animals) and cKO (red, n = 473 axons, 3 animals). (L) Tuj1 immunostaining on transverse sections of P21 sciatic nerves. Insets show higher magnification of images with neural loss in cKO animals (WT, n = 5; cKO, n = 3). Anca G. Radu et al. Sci Adv 2019;5:eaau5106 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).