Objective To investigate the expressions of Smad2,Smad3 and Smad4in cutaneous melanoma. Methods Reverse transcription-real time polymerase chain reaction(RT-PCR)and Western blotting were utilized to detect the expressions of A375 cell line in cutaneous melanoma and Smad2,Smad3 and Smad4in normal melanocytes. Results The expressions of Smad2,Smad3 and Smad4mRNA of A375 cells line were significantly lower than human normal melanocytes(t=2.361-4.214,P<0.01). Conclusion In TGF-β/Smad signaling pathways,the down...