Abstract:
Inhibitory Effect of Doxycycline on the Adhesion of Melanoma Cells and Its MolecularMechanismsHenglei DONG1, Baocun SUN1, Tao SUN2, Nan ZHAO2, Xueyi DONG2, Na CHE2, Xiulan ZHAO2Correspondence to: Baocun SUN, E-mail: sunbaocun@yahoo.com.cn1Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China2Department of Pathology, Tianjin Medical University, Tianjin 300070, ChinaThis work was supported by a grant from the National Natural Science Foundation of China (No. 30830049, 30770828), the Key Tech-nologies R & D Program of Tianjin (No. 3083004909ZCZD), and the Key Program of Tianjin Municipal Science and Technology Com-mission (No. 08JCZDJC23500)Abstract Objective: To investigate the inhibitory effect of Doxycycline on the adhesion of melanoma cells and its mechanism.Methods: Melanoma B16F110, WM351 and WM451 cell lines were treated with Doxycycline at different doses and through differentadministration methods. MMT, cell adhesion experiment and Western blot were used to observe the effect of different treatment. A totalof 20 C57/BL mice were transplanted with melanoma through injection of B16F10 cells and were divided into two groups. One groupwas treated with Doxycycline, and the other NaCl solution. Carcinoma tissues were obtained and underwentWestern blot and gelatin zy-mography. Results: MTT analysis showed that the inhibition ratio was significantly higher in the group receiving treatment before celladhesion than in the group receiving treatment after cell adhesion ( P < 0.05 ). Cell adhesion experiment showed that Doxycycline hadan inhibitory effect on the adhesion of B16F110, WM351 and WM451 cells, with a statistical significance ( P < 0.05 ). Western blot re-vealed that FAK expression in the three cell lines was decreased at 12 h after Doxycycline treatment. Observations from the mice mela-noma model suggested obvious changes in FAK expression and its phosphorylation level ( P < 0.05 ). Conclusion: Doxycycline can in-terfere the adhesion of melanoma cells, possibly through inhibiting FAK expression and its phosphorylation.Keywords Doxycycline; Melanoma; Adhesion; FAK