Abstract
Roof plate specific spondins (Rspos) are important activators of the Wnt signaling pathway discovered recently. Rspos include four secreted proteins: Rspo1, Rspo2, Rspo3, and Rspo4.They are mainly involved in the regulation of cell proliferation and differentiation via regulating the canonical Wnt/β-catenin signaling pathway.The physiological functions of Rspos include regulating sex selection, limb development, organ formation and development. Rspos are involved in the pathogenesis of some malignant tumors, and the roles of Rspos vary in different types of tumors.
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