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CD140a, also known as Platelet-Derived Growth Factor Receptor Alpha （PDGFRα）, is a cell surface receptor tyrosine kinase that plays a crucial role in various biological processes. It is a member of the receptor tyrosine kinase （RTK） III class and is widely expressed in cells of mesenchymal origin, including fibroblasts, endothelial cells, glial cells, and certain tumor cells. CD140a binds to various isoforms of platelet-derived growth factors （PDGFs） such as PDGF-AA, PDGF-AB, and PDGF-BB, forming homodimers or heterodimers with CD140b （PDGFRβ） to mediate cellular responses. This receptor is involved in cell proliferation, differentiation, migration, and survival, and is essential for embryonic development, wound healing, and the regulation of platelet activation.