Humanin (HN) and glucose transporter 8 (GLUT8) in pregnancies complicated by intrauterine growth restriction.

Humanin (HN) and glucose transporter 8 (GLUT8) in pregnancies complicated by intrauterine growth restriction.
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DOI:
10.1371/journal.pone.0193583
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Devaskar SU
Devaskar SU
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Janzen C;Lei MYY;Jeong ISD;Ganguly A;Sullivan P;Paharkova V;Capodanno G;Nakamura H;Perry A;Shin BC;Lee KW;Devaskar SU

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宫内生长受限(IUGR)是由于缺乏传递给发育中胎儿的营养物质,尤其是氧气和葡萄糖所致。在缺氧应激条件下,细胞保护性线粒体肽人源素(HN)以及葡萄糖转运蛋白8(GLUT8)的表达增加已有报道。然而,在与IUGR相关的胎盘病理学中,HN和GLUT8的存在以及细胞定位仍未被探究。因此,我们开展了这项研究,以调查在受IUGR影响的妊娠与正常妊娠中胎盘HN和GLUT8的表达情况。 我们发现:1)与对照(即孕周相符)妊娠相比,在人受IUGR影响的妊娠中,胎盘母体面(绒毛外滋养层(EVT)细胞质)的HN表达增加,并且在同一区域GLUT8表达也随之增加;2)通过免疫共沉淀,HN和GLUT8显示出蛋白质 - 蛋白质相互作用;3)在人EVT细胞HTR8/SVneo模拟缺氧的体外条件下,HN和GLUT8水平升高;4)在HTR8/SVneo细胞血清剥夺的体外条件下,HN表达增加但GLUT8表达减弱。 在受IUGR影响的人胎盘母体面,HN表达升高且定位于EVT细胞质,同时还与GLUT8表达增加有关。我们发现,虽然缺氧会使HN和GLUT8两者都增加,但血清剥夺仅使HN表达增加。此外,HN和GLUT8之间的蛋白质 - 蛋白质相互作用表明,它们的相互作用可能具有一种需要相互依赖的生物学作用。未来需要进一步研究阐明这些蛋白质之间的分子相互作用,以充分揭示它们在受IUGR影响的妊娠中的作用。
Intrauterine growth restriction (IUGR) results from a lack of nutrients transferred to the developing fetus, particularly oxygen and glucose. Increased expression of the cytoprotective mitochondrial peptide, humanin (HN), and the glucose transporter 8, GLUT8, has been reported under conditions of hypoxic stress. However, the presence and cellular localization of HN and GLUT8 in IUGR-related placental pathology remain unexplored. Thus, we undertook this study to investigate placental expression of HN and GLUT8 in IUGR-affected versus normal pregnancies. We found 1) increased HN expression in human IUGR-affected pregnancies on the maternal aspect of the placenta (extravillous trophoblastic (EVT) cytoplasm) compared to control (i.e. appropriate for gestational age) pregnancies, and a concomitant increase in GLUT8 expression in the same compartment, 2) HN and GLUT8 showed a protein-protein interaction by co-immunoprecipitation, 3) elevated HN and GLUT8 levels in vitro under simulated hypoxia in human EVT cells, HTR8/SVneo, and 4) increased HN expression but attenuated GLUT8 expression in vitro under serum deprivation in HTR8/SVneo cells. There was elevated HN expression with cytoplasmic localization to EVTs on the maternal aspect of the human placenta affected by IUGR, also associated with increased GLUT8 expression. We found that while hypoxia increased both HN and GLUT8, serum deprivation increased HN expression alone. Also, a protein-protein interaction between HN and GLUT8 suggests that their interaction may fulfill a biologic role that requires interdependency. Future investigations delineating molecular interactions between these proteins are required to fully uncover their role in IUGR-affected pregnancies.
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