Hum. Reprod. Advance Access published online on July 18, 2007
Human Reproduction, doi:10.1093/humrep/dem222
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Cyclosporine A induces titin expression via MAPK/ERK signalling and improves proliferative and invasive potential of human trophoblast cells
1 Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics and Gynecology, Fudan University Shanghai Medical College, Shanghai 200011, People‘s Republic of China 2 Department of Obstetrics and Gynecology, The Affiliated Hospital, Hainan Medical College, Haikou 570102, People‘s Republic of China
3 Correspondence address. Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics and Gynecology, Fudan University Shanghai Medical College, Shanghai 200011, People‘s Republic of China. Tel, Fax: +86 21 6345 7331; E-mail: djli{at}shmu.edu.cn
BACKGROUND: Cyclosporin A (CsA) is a powerful immunosuppressive that has been widely used to prevent organ rejection and to treat certain autoimmune diseases. Our previous study showed that CsA at low concentrations could promote proliferation and invasion, and inhibit apoptosis, of human first trimester trophoblasts. In the present study, we further explored the potential mechanism and signal pathway.
METHODS: After treatment of JAR cells with CsA, we screened the differentially expressed genes by suppression subtractive hybridization (SSH), and characterized the differentially expressed gene, titin, in human first-trimester trophoblasts by reverse transcription–polymerase chain reaction and Western blot. Mitogen-activated protein kinase (MAPK) activity was evaluated by ELISA.
RESULTS: CsA stimulated proliferation and invasion of human trophoblasts in a dose-dependent manner, and this appeared to be positive correlated with titin transcription, suggesting that CsA regulates biological functions of human trophoblast by inducing titin expression. Furthermore, the CsA treatment increased the MAPK activity, and blocking of the signaling pathway by Mitogen-activated protein MAPK (MEK) inhibitor, U0126, inhibited CsA-induced titin transcription in trophoblasts.
CONCLUSIONS: Our results indicate that titin expression is induced by CsA via activation of MAPK pathways and this may possibly be involved in promoting human trophoblast growth and invasiveness, which is beneficial to embryo viability.
Key words: cyclosporin A/proliferation and invasion/titin/MAPK/ERK/trophoblast
Submitted on January 27, 2007; resubmitted on June 14, 2007; accepted on June 21, 2007.
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