scholarly journals 410 Steroids Regulate SLC2A1 and SLC2A3 to Deliver Glucose into Trophectoderm for Metabolism via Glycolysis

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 188-189
Author(s):  
Gregory A Johnson ◽  
Avery C Kramer ◽  
Chelsie Steinhauser ◽  
Heewon Seo ◽  
Bryan A McLendon ◽  
...  
Keyword(s):  
Temporal Pattern ◽  
Sugar Transport ◽  
Glucose Transporters ◽  
Luminal Epithelium ◽  
Specific Expression ◽  
Uterine Lumen ◽  
Placental Membranes ◽  
Oxidation Of Glucose ◽  
Implantation Period

Abstract The conceptuses (embryo/fetus and placental membranes) of pigs require energy to support elongation and implantation, and amounts of glucose and fructose increase in the uterine lumen during the peri-implantation period. Conceptuses from Day 16 of pregnancy were incubated with either 14C-glucose or 14C-fructose and amounts of radiolabeled CO2 released from the conceptuses measured to determine rates of oxidation of glucose and fructose. Both glucose and fructose transport into conceptuses, and glucose is preferentially metabolized in the presence of fructose, while fructose is actively metabolized in the absence of glucose and to a lesser extent in the presence of glucose. Endometrial and placental expression of glucose transporters SLC2A1, SLC2A2, SCL2A3 and SLC2A4 were determined. SLC2A1 mRNA and protein, and SLC2A4 mRNA were abundant in the uterine luminal epithelium of pregnant compared to cycling gilts, and increased in response to progesterone and conceptus-secreted estrogen. SLC2A2 mRNA was expressed weakly by conceptus trophectoderm on Day 15 of pregnancy, while SLC2A3 mRNA was abundant in trophectoderm/chorion throughout pregnancy. Therefore, glucose can be transported into the uterine lumen by SLC2A1, and then into conceptuses by SLC2A3. On Day 60 of gestation, the cell-specific expression of these transporters was more complex, suggesting that glucose and fructose transporters are precisely regulated in a spatial-temporal pattern along the uterine-placental interface of pigs to maximize hexose sugar transport to the pig conceptus/placenta.

scholarly journals Steroids Regulate SLC2A1 and SLC2A3 to Deliver Glucose Into Trophectoderm for Metabolism via Glycolysis

Endocrinology ◽  
2020 ◽  
Vol 161 (8) ◽  
Author(s):  
Avery C Kramer ◽  
Chelsie B Steinhauser ◽  
Haijun Gao ◽  
Heewon Seo ◽  
Bryan A McLendon ◽  
...  
Keyword(s):  
Messenger Rna ◽  
Temporal Pattern ◽  
Sugar Transport ◽  
Glucose Transporters ◽  
Luminal Epithelium ◽  
Specific Expression ◽  
Uterine Lumen ◽  
Placental Membranes ◽  
Oxidation Of Glucose ◽  
Implantation Period

Abstract The conceptuses (embryo/fetus and placental membranes) of pigs require energy to support elongation and implantation, and amounts of glucose and fructose increase in the uterine lumen during the peri-implantation period. Conceptuses from day 16 of pregnancy were incubated with either 14C-glucose or 14C-fructose and amounts of radiolabeled CO2 released from the conceptuses measured to determine rates of oxidation of glucose and fructose. Glucose and fructose both transport into conceptuses, and glucose is preferentially metabolized in the presence of fructose, whereas fructose is actively metabolized in the absence of glucose and to a lesser extent in the presence of glucose. Endometrial and placental expression of glucose transporters SLC2A1, SLC2A2, SCL2A3, and SLC2A4 were determined. SLC2A1 messenger RNA (mRNA) and protein, and SLC2A4 mRNA were abundant in the uterine luminal epithelium of pregnant compared to cycling gilts, and increased in response to progesterone and conceptus-secreted estrogen. SLC2A2 mRNA was expressed weakly by conceptus trophectoderm on day 15 of pregnancy, whereas SLC2A3 mRNA was abundant in trophectoderm/chorion throughout pregnancy. Therefore, glucose can be transported into the uterine lumen by SLC2A1, and then into conceptuses by SLC2A3. On day 60 of gestation, the cell-specific expression of these transporters was more complex, suggesting that glucose and fructose transporters are precisely regulated in a spatial-temporal pattern along the uterine-placental interface of pigs to maximize hexose sugar transport to the pig conceptus/placenta.

Specific expression and regulation of glucose transporters in zebrafish ionocytes

2009 ◽  
Vol 297 (2) ◽  
pp. R275-R290 ◽  
Author(s):  
Yung-Che Tseng ◽  
Ruo-Dong Chen ◽  
Jay-Ron Lee ◽  
Sian-Tai Liu ◽  
Shyh-Jye Lee ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Energy Supply ◽  
Energy Deposition ◽  
Glucose Transporters ◽  
Regulatory Mechanisms ◽  
Specific Expression ◽  
Physiological Demands ◽  
And Function ◽  
Critical Process

Glucose, a carbohydrate metabolite, plays a major role in the energy supply for fish iono- and osmoregulation, and the way that glucose is transported in ionocytes is a critical process related to the functional operations of ionocytes. Eighteen members of glucose transporters (GLUTs, SLC2A) were cloned and identified from zebrafish. Previously, Na+,K+-ATPase-rich (NaR), Na+-Cl− cotransporter-expressing (NCC), H+-ATPase-rich (HR), and glycogen-rich (GR) cells have been identified to be responsible for Ca2+ uptake, Cl− uptake, Na+ uptake, and the energy deposition, respectively, in zebrafish skin/gills. The purpose of the present study was to test the hypothesis of whether GLUT isoforms are specifically expressed and function in ionocytes to supply energy for ion regulatory mechanisms. On the basis of translational knockdown of foxi3a/ 3b (2 transcriptional factors related to the ionocytes' differentiation) and triple in situ hybridization/immunocytochemistry, 3 GLUT isoforms, zglut1a, - 6, and - 13.1, were specifically localized in NaR/NCC cells, GR cells, and HR cells, respectively. mRNA expression of zglut1a in embryos and adult gills were stimulated by the low Ca2+ or low Cl− freshwater, which has been previously reported to upregulate the functions (monitored by epithelial Ca2+ channel, NCC mRNA) of NaR/NCC cells, respectively while that of zglut13.1 was stimulated only by low Na+, a situation to upregulate the function (monitored by carbonic anhydrase 15a mRNA) of HR cells. On the other hand, ambient ion compositions did not affect the zglut6 mRNA expression. Taken together, zGLUT1a, -6, and 13.1, the specific transporters in NaR/NCC cells, GR cells, and HR cells, may absorb glucose into the respective cells to fulfill different physiological demands.

Identification of a novel glucose transporter-like protein—GLUT-12

2002 ◽  
Vol 282 (3) ◽  
pp. E733-E738 ◽  
Author(s):  
Suzanne Rogers ◽  
Maria L. Macheda ◽  
Susan E. Docherty ◽  
Maynard D. Carty ◽  
Michael A. Henderson ◽  
...  
Keyword(s):  
Breast Cancer Cells ◽  
Glucose Transporter ◽  
Sugar Transport ◽  
Amino Acid Identity ◽  
Specific Expression ◽  
Glut 4 ◽  
Glucose Transport System ◽  
Metabolic Properties ◽  
Mcf 7

Facilitative glucose transporters exhibit variable hexose affinity and tissue-specific expression. These characteristics contribute to specialized metabolic properties of cells. Here we describe the characterization of a novel glucose transporter-like molecule, GLUT-12. GLUT-12 was identified in MCF-7 breast cancer cells by homology to the insulin-regulatable glucose transporter GLUT-4. The GLUT-12 cDNA encodes 617 amino acids, which possess features essential for sugar transport. Di-leucine motifs are present in NH2 and COOH termini at positions similar to the GLUT-4 FQQI and LL targeting motifs. GLUT-12 exhibits 29% amino acid identity with GLUT-4 and 40% to the recently described GLUT-10. Like GLUT-10, a large extracellular domain is predicted between transmembrane domains 9 and 10. Genomic organization of GLUT-12 is highly conserved with GLUT-10 but distinct from GLUTs 1–5. Immunofluorescence showed that, in the absence of insulin, GLUT-12 is localized to the perinuclear region in MCF-7 cells. Immunoblotting demonstrated GLUT-12 expression in skeletal muscle, adipose tissue, and small intestine. Thus GLUT-12 is potentially part of a second insulin-responsive glucose transport system.

Change in distribution of cytoskeleton-associated proteins, lasp-1 and palladin, during uterine receptivity in the rat endometrium

2018 ◽  
Vol 30 (11) ◽  
pp. 1482 ◽  
Author(s):  
Leigh Nicholson ◽  
Laura Lindsay ◽  
Christopher R. Murphy
Keyword(s):  
Plasma Membrane ◽  
Focal Adhesion ◽  
Early Pregnancy ◽  
Morphological Changes ◽  
Cytoskeletal Proteins ◽  
Initial Contact ◽  
Luminal Epithelium ◽  
Uterine Receptivity ◽  
Uterine Lumen ◽  
Associated Proteins

The epithelium of the uterine lumen is the first point of contact with the blastocyst before implantation. To facilitate pregnancy, these uterine epithelial cells (UECs) undergo morphological changes specific to the receptive uterus. These changes include basal, lateral and apical alterations in the plasma membrane of UECs. This study looked at the cytoskeletal and focal adhesion-associated proteins, lasp-1 and palladin, in the uterus during early pregnancy in the rat. Two palladin isoforms, 140 kDa and 90 kDa, were analysed, with the migration-associated 140-kDa isoform increasing significantly at the time of implantation when compared with the time of fertilisation. Lasp-1 was similarly increased at this time, whilst also being located predominantly apically and laterally in the UECs, suggesting a role in the initial contact between the UECs and the blastocyst. This is the first study to investigate palladin and lasp-1 in the uterine luminal epithelium and suggests an importance for these cytoskeletal proteins in the morphological changes the UECs undergo for pregnancy to occur.

Glycosylation changes during differentiation of the murine uterine epithelium

2001 ◽  
Vol 29 (2) ◽  
pp. 156-162 ◽  
Author(s):  
S. J. Kimber ◽  
R. E. Stones ◽  
S. S. Sidhu
Keyword(s):  
Early Pregnancy ◽  
Uterine Epithelium ◽  
Luminal Epithelium ◽  
Mrna Levels ◽  
Specific Expression ◽  
Ovarian Steroids ◽  
Stimulation Of

In mouse uterine luminal epithelium (LE) several terminal carbohydrate structures are regulated by ovarian steroids and show stage-specific expression during early pregnancy. We have demonstrated that expression of H-type-1 antigen (Fucα1-2Galβ1-3GlcNAcβ1-) is regulated by oestrogenic stimulation of α-2fucosyltransferase (fut1) mRNA levels in LE. H-type-1 expression is high after ovulation but becomes negligible after implantation. In contrast, NeuNAcα2-3Galβ1-, and specifically sialyl Le-x (NeuAcα2,3Galβ1,4-[Fucα1-3]GlcNAcβ1-), is stimulated by progesterone. It is not expressed on LE after ovulation but is expressed maximally on apical LE at the time of and after implantation. However, mRNA levels for 4 out of 5 known Gal/GalNAc α2-3sialyltransferases appear not to change in LE during early pregnancy, suggesting an alternative level of control.

Evidence for a blood – uterine lumen permeability barrier in rats treated with hormones to mimic early pseudopregnancy

1982 ◽  
Vol 60 (12) ◽  
pp. 1630-1635 ◽  
Author(s):  
Ann C. McRae ◽  
T. G. Kennedy
Keyword(s):  
Intravenous Injection ◽  
Tritiated Water ◽  
Permeability Barrier ◽  
Test Substance ◽  
Uterine Lumen ◽  
Induced Ovulation ◽  
Uterine Fluid ◽  
Implantation Period ◽  
Period Of Gestation

Experiments have been carried out to investigate whether a blood – uterine lumen permeability barrier exists in rats treated with hormones to mimic the implantation period of gestation. Levels of radioactivity in fluid from the uterine lumen and in serum of rats at the equivalent of day 4, 5, or 6 of pseudopregnancy (day 1 = day of induced ovulation) were determined either 20 or 60 min after intravenous injection of a radiolabelled test substance. Following injection of [14C]urea or [3H]sucrose, uterine fluid (UF) radioactivity concentrations did not differ significantly between 20 and 60 min irrespective of day of pseudopregnancy. With [14C]urea, UF radioactivity concentrations were significantly less than those in serum in all groups except at the equivalent of day 6 of pseudopregnancy. After injection of [3H]sucrose, the UF radioactivity concentrations were significantly less than those in serum in all groups except at 60 min at the equivalent of day 6 of pseudopregnancy. Additionally, the UF radioactivity concentrations after injection of either [14C]urea or [3H]sucrose were significantly higher on the equivalent of day 6 of pseudopregnancy than on day 4. By contrast, when tritiated water was injected, the UF radioactivity concentrations were not markedly different from those in serum in all groups.not available

Regulation of Embryonic Signal on Talin1 in Mouse Endometrium

2018 ◽  
Vol 26 (9) ◽  
pp. 1277-1286
Author(s):  
Ying Shen ◽  
Aiping Qin
Keyword(s):  
Stromal Cells ◽  
Treatment Model ◽  
Successful Pregnancy ◽  
Dynamic Changes ◽  
Specific Expression ◽  
Cytoplasmic Staining ◽  
Delayed Implantation ◽  
Pregnant Mice ◽  
Implantation Period ◽  
Lower Expression

Embryonic signals can affect the spatiotemporal-specific expression of the uterus to establish a successful pregnancy. Our previous study has found that talin1 underwent dynamic changes in the mouse endometrium during peri-implantation period. However, whether talin1 is affected by the embryo signals is not clear. In order to investigate the effect of embryonic signals, especially human chorionic gonadotropin (HCG) on talin1, we have designed mouse models of pseudopregnancy, delayed implantation and activation, and HCG treatment. Using these models, the expression of talin1 in the mouse endometrium was determined by immunohistochemistry and Western blotting. In the pseudopregnancy model, an increased expression of talin1 was found from day 3 to day 5, whereas the talin1 protein was decreased on day 5 in the normal pregnant mice. In the delayed implantation model, a strong cytoplasmic staining of talin1 was found, especially in stromal cells. However, after activation of the implantation, the expression of talin1 decreased ( P < .05). Furthermore, a significantly lower expression of talin1 was found at the implantation site when compared to the interimplantation sites ( P < .05). In the HCG treatment model, an intrauterine perfusion of 10u HCG significantly reduced the expression of talin1 in both stromal and epithelial cells in pseudopregnant mice ( P < .05), although further increase in the HCG concentration did not have additional effect on expression of talin1. Taken together, our data suggest that the presence of embryos can affect expression of talin1 in the mouse endometrium, and a certain concentration of HCG can regulate its expression.

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