The FOS transcription factor family differentially controls trophoblast migration and invasion Journal Article

Authors: Renaud, Stephen J; Kubota, Kaiyu; Rumi, M A Karim; Soares, Michael J
Article Title: The FOS transcription factor family differentially controls trophoblast migration and invasion
Abstract: Extravillous trophoblast invasion is a fundamental component of human placentation. Invading trophoblast cells promote blood flow to the conceptus by actively remodeling the uterine vasculature. The extent of trophoblast invasion is tightly regulated; aberrant invasion is linked with several obstetrical complications. However, the transcriptional networks responsible for controlling the extent of trophoblast invasion are not well defined. Previous studies have identified high levels of FOS (FOS, FOSB, FOS-like (FOSL) 1, and FOSL2) proteins in extravillous trophoblast cells. These proteins form part of the activating protein-1 (AP-1) transcription factor complex and are implicated in regulating gene networks controlling cellular invasion in diverse biological systems. Therefore, we hypothesized that FOS family proteins play a role in regulating trophoblast invasion. We assessed expression of FOS family proteins in trophoblast cell lines and human placentae at different gestational ages. FOS, FOSB, and FOSL1 proteins were robustly increased in trophoblast cells subject to wound-based migration assays as well as Matrigel-based invasion assays. FOS knockdown resulted in cessation of proliferation and an induction of migration and invasion concomitant with robust expression of matrix metalloproteinase (MMP) 1, MMP3, and MMP10. Conversely, FOSL1 knockdown abrogated trophoblast migration and invasion and inhibited the production of MMP1, MMP3, and MMP10. In human placenta, FOS was expressed in proximal anchoring villi in conjunction with phospho-ERK. FOSL1 was temporally expressed only in the distal-most extravillous trophoblast cells, which represent a migratory cell population. Therefore, FOS and FOSL1 exert opposing effects on trophoblast invasion.
Keywords: Humans; Female; Pregnancy; Cell Line; Multigene Family; RNA, Messenger; Gene Expression Regulation; Cell Movement; Cell Proliferation; Drug Combinations; Cell Cycle; MAP Kinase Signaling System; Collagen; Proto-Oncogene Proteins c-fos; Proteoglycans; Laminin; Gene Knockdown Techniques; Neovascularization, Physiologic; Trophoblasts; Matrix Metalloproteinases; RNA, Small Interfering; Extracellular Signal-Regulated MAP Kinases
Journal Title: The Journal of biological chemistry
Volume: 289
Issue: 8
ISSN: 1083-351X
Publisher: American Society for Biochemistry and Molecular Biology  
Date Published: 2014
Start Page: 5025
End Page: 5039