NME1 at the human maternal-fetal interface downregulates titin expression and invasiveness of trophoblast cells via MAPK pathway in early pregnancy.
Nometastatic gene 23-H1 (NME1, also known as nm23-H1) is a wide-spectrum tumor metastasis suppressor gene that plays an important role in suppressing the invasion and metastasis of tumor cells. It has been demonstrated that NME1 is also expressed in human first-trimester placenta, but its function at maternal-fetal interface is not clear. The present study aimed to elucidate the biological function of NME1 at the maternal-fetal interface, especially on invasion of the human extravillous cytotrophoblasts (EVCTs). NME1 has been identified in both human trophoblast cells and decidual stromal cells (DSCs) in early pregnancy. We have proved that NME1 silencing in vitro increases the titin protein translation in the invasive EVCTs. Moreover, NME1 can inactivate the phospho-extracellular signal-regulated kinase 1/2 (P-ERK1/2) in trophoblasts in a time-dependent manner, and U0126, an inhibitor of MAPK/ERK, can inhibit partly the enhanced invasiveness and titin expression in trophoblasts induced by NME1 silencing. Interestingly, the expression of NME1 in either villi or decidua is higher significantly in miscarriage than that of the normal early pregnancy. These findings first reveal that the NME1 expressed in trophoblasts and DSCs controls the inappropriate invasion of human first-trimester trophoblast cells via MAPK/ERK1/2 signal pathway, and the overexpression of NME1 at maternal-fetal interface leads to pregnancy wastage.
Department of Pathophysiology, Soochow University Medical College, Suzhou, People's Republic of China.
Ke-Ming
KM
Xie
Xiao-Fan
XF
Hou
Ming-Qing
MQ
Li
Da-Jin
DJ
Li
D000022:Abortion, Spontaneous / Q000235:genetics; D002448:Cell Adhesion / Q000187:drug effects / Q000235:genetics; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D018920:Coculture Techniques; D064211:Connectin; D015536:Down-Regulation / Q000187:drug effects / Q000235:genetics; D010064:Embryo Implantation / Q000235:genetics; D005260:Female; D006801:Humans; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D008431:Maternal-Fetal Exchange / Q000502:physiology; D009124:Muscle Proteins / Q000235:genetics* / Q000378:metabolism; D054778:NM23 Nucleoside Diphosphate Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D010920:Placenta / Q000378:metabolism; D011247:Pregnancy; D011261:Pregnancy Trimester, First / Q000235:genetics* / Q000378:metabolism; D011494:Protein Kinases / Q000235:genetics* / Q000378:metabolism; D034741:RNA, Small Interfering / Q000494:pharmacology; D014327:Trophoblasts / Q000187:drug effects / Q000378:metabolism*
D064211:Connectin; D009124:Muscle Proteins; D054778:NM23 Nucleoside Diphosphate Kinases; D034741:RNA, Small Interfering; C577285:TTN protein, human; D011494:Protein Kinases; C517938:NME1 protein, human