Abstract
Signaling of TGFβ family members such as activin is tightly regulated by soluble binding proteins. Follistatin binds to activin A with high affinity, and prevents activin binding to its own receptors, thereby blocking its signaling. We previously identified FLRG gene from a B-cell leukemia carrying a t(11;19)(q13;p13) translocation. We and others have already shown that FLRG, which is highly homologous to follistatin, may be involved in the regulation of the activin function through its binding to activin. In this study, we found that, like follistatin, FLRG protein inhibited activin A signaling as demonstrated by the use of a transcriptional reporter assay, and blocked the activin A-induced growth inhibition of HepG2 cells. We have recently shown that the TGFβ-induced expression of FLRG occurs at a transcriptional level through the action of Smad proteins. Here we show that activin A increases FLRG and follistatin at both the mRNA and protein levels. We found that Smad proteins are involved in the activin A-induced transcription activation of FLRG and follistatin. Finally we demonstrate that FLRG protein regulates its own activin-induced expression. In conclusion, activin A induces FLRG and follistatin expression. This observation, in conjunction with the antagonistic effect of FLRG and follistatin on activin signaling, indicates that these two proteins participate in a negative feedback loop which regulates the activin function.
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Acknowledgements
This study was supported by grants from INSERM, the Association pour la Recherche contre le Cancer, the Ligue contre le Cancer (Comités du Rhône et de la Saône et Loire). L Bartholin holds a doctoral fellowship from the Ligue contre le Cancer, Comité de la Haute Savoie. We would like to thank JM Gauthier for providing the (CAGA)9-MLP-Luc reporter vector, P ten Dijke for the mammalian expression vectors encoding the flag-tagged human Smad2, Smad3, Smad4 and Smad7, and R Derynck for the mammalian expression vectors encoding human dominant-negative Smad3 and Smad4. We would also like to thank MJ N'Guyen and C Lamadon for their technical assistance.
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Bartholin, L., Maguer-Satta, V., Hayette, S. et al. Transcription activation of FLRG and follistatin by activin A, through Smad proteins, participates in a negative feedback loop to modulate activin A function. Oncogene 21, 2227–2235 (2002). https://doi.org/10.1038/sj.onc.1205294
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DOI: https://doi.org/10.1038/sj.onc.1205294
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