AIM: To analyze the expression levels of CD147 in villous tissues of patients with unexplained spontaneous abortion and to investigate its biological function in human primary trophoblasts in vitro. METHODS: The villous tissues were collected from the women with normal early pregnancy and unexplained spontaneous abortion. The expression levels of CD147 were determined by immunohistochemical staining,reverse transcriptase-polymerase chain reaction( RT-PCR) and Western blotting. The primary trophoblasts were ...