title: Fractone-associated N-sulfated heparan sulfate shows reduced quantity in BTBR T+tf/J mice: a strong model of autism.
abstract: BTBR T+tf/J (BTBR) mice show abnormal social, communicatory, and repetitive/stereotyped behaviors paralleling many of the symptoms of autism spectrum disorders. BTBR also show agenesis of the corpus callosum (CC) suggesting major perturbations of growth or guidance factors in the dorsal forebrain [1]. Heparan sulfate (HS) is a polysaccaride found in the brain and other animal tissues. It binds to a wide variety of ligands and through these ligands modulates a number of biological processes, including cell proliferation and differentiation, migration and guidance. It is aggregated on fractal-like structures (fractones) in the subventricular zone (SVZ), that may be visualized by laminin immunoreactivity (LAM-ir), as well as by HS immunoreactivity (HS-ir). We report that the lateral ventricles of BTBR mice were drastically reduced in area compared to C57BL/6J (B6) mice while the BTBR SVZ was significantly shorter than that of B6. In addition to much smaller fractones for BTBR, both HS and LAM-ir associated with fractones were significantly reduced in BTBR, and their anterior-posterior distributions were also altered. Finally, the ratio of HS to LAM in individual fractones was significantly higher in BTBR than in B6 mice. These data, in agreement with other findings linking HS to callosal development, suggest that variations in the quantity and distribution of HS in the SVZ of the lateral ventricles may be important modulators of the brain structural abnormalities of BTBR mice, and, potentially, contribute to the behavioral pathologies of these animals.
authors.affiliation: Pacific Biosciences Research Center, University of Hawaii, 1993 East-West Road, Honolulu, HI 96822, USA.
authors.forename: Ksenia Z
authors.initials: KZ
authors.lastname: Meyza
authors.forename: D Caroline
authors.initials: DC
authors.lastname: Blanchard
authors.forename: Brandon L
authors.initials: BL
authors.lastname: Pearson
authors.forename: Roger L H
authors.initials: RL
authors.lastname: Pobbe
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Blanchard
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001321:Autistic Disorder / Q000235:genetics / Q000378:metabolism* / Q000473:pathology* / Q000503:physiopathology; D001921:Brain / Q000473:pathology; D003337:Corpus Callosum / Q000378:metabolism / Q000473:pathology; D004195:Disease Models, Animal; D006497:Heparan Sulfate / Q000378:metabolism*; D034882:Lamins / Q000378:metabolism; D020547:Lateral Ventricles / Q000378:metabolism* / Q000473:pathology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008818:Mice, Neurologic Mutants; D010641:Phenotype
chemical_list: D006497:Heparan Sulfate; D034882:Lamins
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