Abstract
Congenital scoliosis is a condition characterized by spinal curvature beyond the physiological norm. The molecular mechanisms underlying the pathogenesis of congenital scoliosis are beginning to be clarified; however, the genes related to congenital scoliosis are still unknown. We herein report the results of a comprehensive analysis of gene expression in the spines from a rat model of congenital kyphoscoliosis obtained using DNA microarrays. The rats (Ishibashi rats, IS) showed decreased expression levels of genes associated with bone formation, such as those associated with retinol metabolism and type I collagen. Interestingly, the flexion sites of the IS rats showed low expression levels of tropomyosin receptor kinases (Trks: TrkA, TrkB, and TrkC), which belong to the neurotrophic receptor tyrosine kinase family. Moreover, this phenomenon was observed only in the flexion sites of the spine, and the expression levels of Trks in other parts of the spine in these rats were normal. The decreased expression levels of Trks were observed at both the mRNA and protein levels. We also observed that the number of Trk-immunopositive cells in the lumbar spine in the IS rats was lower than that in wild-type rats. These findings indicate that the Trks have an important function in regulating normal bone formation, and provide a molecular explanation for the pathogenesis of congenital kyphoscoliosis.
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Acknowledgments
This work was supported by a Grant-in-Aid for Scientific Research (C) (25462286) from the JSPS (to H.I.) and the Mishima Kaiun Memorial Foundation, Japan (to N.S.).
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Tsunoda, D., Iizuka, H., Ichinose, T. et al. The Trk family of neurotrophin receptors is downregulated in the lumbar spines of rats with congenital kyphoscoliosis. Mol Cell Biochem 412, 11–18 (2016). https://doi.org/10.1007/s11010-015-2603-z
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DOI: https://doi.org/10.1007/s11010-015-2603-z