High expression of N-acetylglucosaminyltransferase IVa promotes invasion of choriocarcinoma.

High expression of N-acetylglucosaminyltransferase IVa promotes invasion of choriocarcinoma.
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DOI:
10.1038/bjc.2012.496
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发表时间:
2012-12-04
影响因子:
8.8
通讯作者:
Kikkawa, F.
Kikkawa, F.
中科院分区:
医学1区
文献类型:
--
作者:
Niimi, K.;Yamamoto, E.;Fujiwara, S.;Shinjo, K.;Kotani, T.;Umezu, T.;Kajiyama, H.;Shibata, K.;Ino, K.;Kikkawa, F.

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妊娠滋养细胞疾病(GTD)与滋养细胞有关,GTD 和正常胎盘都分泌人绒毛膜促性腺激素(hCG)。然而,在侵袭性葡萄胎和绒毛膜癌中,hCG 上的天冬酰胺连接的糖链含有异常的双触角结构,但在正常妊娠或葡萄胎中则没有。 N-乙酰氨基葡萄糖转移酶-IV (GnT-IV) 催化天冬酰胺连接的寡糖上的 β1,4-N-乙酰氨基葡萄糖分支,这与 hCG 上的异常糖链结构一致。我们通过免疫组织化学、蛋白质印迹和 RT-PCR 研究了 GTD 和胎盘中 GnT-IVa 的表达。我们在体外和体内评估了 GnT-IVa 敲低对绒毛膜癌细胞的影响。 GnT-IVa在侵袭性葡萄胎和绒毛膜癌的滋养细胞中高表达,在妊娠早期在绒毛外滋养细胞中中等表达,但在葡萄胎或其他正常滋养细胞中不表达。绒毛膜癌细胞中 GnT-IVa 的敲低显着降低了迁移和侵袭能力,并抑制了细胞与细胞外基质蛋白的粘附。尽管 β1 整合素的表达没有改变,但 GnT-IVa 敲低大大降低了 β1 整合素上 β1,4-N-乙酰葡糖胺分支的程度。体内研究进一步证明 GnT-IVa 敲低可抑制肿瘤的植入和生长。这些发现表明,GnT-IVa 通过修饰 β1 整合素的寡糖链参与调节绒毛膜癌的侵袭。
Gestational trophoblastic diseases (GTDs) are related to trophoblasts, and human chorionic gonadotropin (hCG) is secreted by GTDs as well as normal placentas. However, the asparagine-linked sugar chains on hCG contain abnormal biantennary structures in invasive mole and choriocarcinoma, but not normal pregnancy or hydatidiform mole. N-acetylglucosaminyltransferase-IV (GnT-IV) catalyses β1,4-N-acetylglucosamine branching on asparagine-linked oligosaccharides, which are consistent with the abnormal sugar chain structures on hCG. We investigated GnT-IVa expression in GTDs and placentas by immunohistochemistry, western blot, and RT–PCR. We assessed the effects of GnT-IVa knockdown in choriocarcinoma cells in vitro and in vivo. The GnT-IVa was highly expressed in trophoblasts of invasive mole and choriocarcinoma, and moderately in extravillous trophoblasts during the first trimester, but not in hydatidiform mole or other normal trophoblasts. The GnT-IVa knockdown in choriocarcinoma cells significantly reduced migration and invasive capacities, and suppressed cellular adhesion to extracellular matrix proteins. The extent of β1,4-N-acetylglucosamine branching on β1 integrin was greatly reduced by GnT-IVa knockdown, although the expression of β1 integrin was not changed. In vivo studies further demonstrated that GnT-IVa knockdown suppressed tumour engraftment and growth. These findings suggest that GnT-IVa is involved in regulating invasion of choriocarcinoma through modifications of the oligosaccharide chains of β1 integrin.
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