Journal: PLoS Biology
Article Title: Early uneven ear input induces long-lasting differences in left–right motor function
doi: 10.1371/journal.pbio.2002988
Figure Lengend Snippet: (A) Immunohistochemical staining of inner ear sections showed reduced SLC12A2 expression (brown) in Tbx1 Cre/+ ; Slc12a2 fx/fx mutants (Nissl counterstain, purple) and defects of the cochlea (top panel) and vestibular structures: saccular vestibular membrane collapse (middle) and ut and cr degeneration (bottom). (B) ABR testing revealed no waveforms at 100 decibels, sound pressure level, in 6-week-old mutants, indicative of deafness. (C) VsEP (P1, first peak; P2, second peak) were absent in mutants, indicative of vestibular impairment. (D) Mutants performed poorly on the rotarod test ( p < 0.0001), consistent with impaired balance. Mean ± SEM, n = 8 mice/genotype, two-tailed t test. See also . (E) Open field recordings of Tbx1 Cre/+ ; Slc12a2 fx/fx mutants showed a turning bias in either the C ( n = 8) or CC ( n = 10) direction (NP, n = 1). Mean ± SEM. See also . (F) Tbx1 Cre/+ ; Slc12a2 fx/fx mutants circle ( n = 37), whereas littermate controls ( n = 10) and Nestin-Cre;Slc12a2 fx/fx mutants do not ( n = 5). Mesp1 Cre/+ ; Slc12a2 fx/fx mutants, in which Slc12a2 expression is lost from the brain vasculature (Antoine et al., 2017), also do not circle. Mean ± SEM. See also . (G) Western blots of striatal lysates from Tbx1 Cre/+ ; Slc12a2 fx/fx mutants showed greater p-ERK1 in the contralateral relative to ipsilateral hemisphere, normalized to β-actin ( p = 0.046, n = 6). Asymmetries in p-ERK1 levels were not detected in Nestin-Cre;Slc12a2 fx/fx mutants ( n = 3). Mean ± SEM, two-tailed t test. See also . ABR, auditory brain stem response; C, clockwise; CC, counterclockwise; cr, cristae; NP, no preference; p-ERK, phosphorylated extracellular signal-regulated kinase; rm, Reissner’s membrane; SEM, standard error of the mean; SPL, sound pressure level; sv, stria vascularis; ut, utricle; vm, vestibular membrane; VsEP, vestibular sensory evoked potential.
Article Snippet: Primary antibodies include mouse NeuN (1:100, Millipore, Burlington, MA), rabbit GFAP (1:500, Dako, Santa Clara, CA), goat SLC12A2 (1:50, Santa Cruz Biotechnology, Dallas, TX), rabbit SLC12A2 (1;100, Proteintech Group, Rosemont, IL), rabbit Laminin (1:200, Millipore), rabbit GFP (1:100, Life Technologies, Carlsbad, CA), rabbit p-ERK (1:200, Cell Signaling, Danvers, MA), mouse Islet1 (1:2, Developmental Studies Hybridoma Bank, Iowa City, IA), and mouse Pou3f1/Oct6 (1:50, Millipore).
Techniques: Immunohistochemical staining, Staining, Expressing, Membrane, Two Tailed Test, Western Blot