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Träfflista för sökning "WFRF:(Hreinsson Julius 1963 ) "

Sökning: WFRF:(Hreinsson Julius 1963 )

  • Resultat 1-7 av 7
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1.
  • Hambiliki, F., et al. (författare)
  • Glycoprotein 130 promotes human blastocyst development in vitro
  • 2013
  • Ingår i: Fertility and Sterility. - 0015-0282 .- 1556-5653. ; 99:6, s. 1592-U444
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: To investigate the efficacy of leukemia inhibitory factor (LIF) and/or glycoprotein 130 Design: Laboratory study. Setting: University hospital-based IVF clinic. Patient(s): A total of 164 frozen embryos that survived thawing were cultured in media supplemented Intervention(s): Morphological development was evaluated by light microscopy. Protein expression Main Outcome Measure(s): Embryo development and protein content. Result(s): Addition of gp130 to culture media improved blastocyst formation (73% vs. 43%). Addition of Conclusion(s): Glycoprotein 130, but not LIF, seems to be beneficial for preimplantation embryo
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2.
  • Kushnir, Mark M., et al. (författare)
  • Exploratory study of the association of steroid profiles in stimulated ovarian follicular fluid with outcomes of IVF treatment
  • 2016
  • Ingår i: Journal of Steroid Biochemistry and Molecular Biology. - 0960-0760 .- 1879-1220. ; 162, s. 126-133
  • Forskningsöversikt (refereegranskat)abstract
    • Steroid concentrations in stimulated follicular fluid (sFF) samples have been linked to the quality of oocytes used in IVF treatments. Most of the published studies focused on evaluating the association of the IVF outcomes with only a few of the steroids, measured by immunoassays (IA). We performed a treatment outcome, prospective cohort study using stimulated FF sampled from 14 infertile women undergoing IVF treatment; single oocyte was used per IVF cycle. Fourteen endogenous steroids were analyzed in 22 ovarian follicle aspirations, which corresponded to the embryos used in the IVF. Ten oocytes were associated with live birth (LB) and 12 with no pregnancy (NP). Steroids were analyzed using liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods. Differences in distribution of concentrations in association with the pregnancy outcome (LB or NP), and receiver operating characteristic (ROC) curves analysis were performed for the entire cohort and for within-women data. The predominant androgen and estrogen in stimulated sFF were androstenedione (A4) and estradiol (E2), respectively. Lower concentrations of pregnenolone (Pr), lower ratios of A4/ dehydroepiandrosterone (DHEA), testosterone (Te)/DHEA, and greater ratios of E2/Te, and estrone/A4 were observed in sFF samples associated with LB. Among the oocytes associated with NP, in four out of 12 samples total concentration of androgens was above the distribution of the concentrations in the oocytes corresponding to the LB group. Observations of the study indicated increased consumption of precursors and increased biosynthesis of estrogens in the follicles associated with LB. Our data suggest that potentially steroid profiles in sFF obtained during oocyte retrieval may serve as biomarkers for selection of the best embryo to transfer after IVF.
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3.
  • Lindgren, Karin Elvine, 1984-, et al. (författare)
  • Differences in secretome in culture media when comparing blastocysts and arrested embryos using multiplex proximity assay
  • 2018
  • Ingår i: Upsala Journal of Medical Sciences. - : TAYLOR & FRANCIS LTD. - 0300-9734 .- 2000-1967. ; 123:3, s. 143-152
  • Tidskriftsartikel (refereegranskat)abstract
    • Objectives: The aim of this study was to assess different patterns of the human embryo secretome analysed as protein levels in culture media. Furthermore, analyses to correlate protein levels with quality and timing to development of human embryos were performed.Material and methods: Human day-2 cryopreserved embryos were cultured for four days in an EmbryoScope((R)) with a time-lapse camera, and embryo quality was evaluated retrospectively. After culture, the media were collected and relative levels of secreted proteins were analysed using Proseek Multiplex Assays. Protein levels were evaluated in relation to timing to development and the ability to form a blastocyst.Results: Specific patterns of timing of development of blastocysts were found, where a difference in time to start of cavitation was found between high- and low-quality blastocysts. There appeared to be a correlation between specific protein patterns and successful formation of morulae and blastocysts. Embryos developing into blastocysts had higher levels of EMMPRIN than arrested embryos, and levels of caspase-3 were lower in high- versus low-quality blastocysts. Also, higher levels of VEGF-A, IL-6, and EMMPRIN correlated with shorter times to morula formation.Conclusions: The secretome and timing to development differ in embryos forming blastocysts and those that become arrested, and in high- versus low-quality blastocysts. The levels of certain proteins also correlate to specific times to development.
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4.
  • Lindgren, Karin E, 1984-, et al. (författare)
  • Histidine-rich glycoprotein derived peptides affect endometrial angiogenesis in vitro but has no effect on embryo development
  • 2016
  • Ingår i: Systems biology in reproductive medicine. - : Taylor & Francis Group. - 1939-6376. ; 62:3, s. 192-200
  • Tidskriftsartikel (refereegranskat)abstract
    • Histidine-rich glycoprotein (HRG) is an abundant plasma protein involved in multiple biological processes including immunology, vascularisation, and coagulation. These processes are of importance in regulating embryo development and implantation. A specific polymorphism in the HRG gene, HRG C633T, has an impact on various aspects of fertility, such as oocyte quality, endometrial receptivity, and possibly the capacity of the embryo itself to implant. To further examine the potential role of the HRG C633T polymorphism in regulating endometrial angiogenesis and on embryo development, two HRG peptides were constructed. These HRG peptides correspond to the amino acids 169-203 of the protein which, in turn, reflects the C633T polymorphism in the gene. The HRG proline or serine peptides were added to cultures of primary human endometrial endothelial (HEE) cells and to human embryos in vitro. The HRG peptides inhibited vascular endothelial growth factor (VEGF) induced proliferation and migration and promoted tube formation of HEE cells. The embryos were monitored using a time-lapse system (EmbryoScope®). Except for a prolonged time from first cleavage after thawing to development of the morula, no difference in embryo morphokinetics or embryo quality was noted in human embryos cultured in the presence of the HRG proline peptide. Taken together, these results suggest that treatment with a specific HRG peptide might prime the endometrium for implantation and be beneficial for adequate placentation. However, addition of a specific HRG proline peptide to human embryos has no beneficial effects in terms of embryo development.ABBREVIATIONS: HRG: histidine-rich glycoprotein; HEE: human endometrial endothelial; VEGF: vascular endothelial growth factor; TSP: thrombospondin; SNP; single nucleotide polymorphism; IVF: in vitro fertilization; CLESH-1: CD36 LIMPII Emp structural homology domain-1; ECM: endothelial cell medium; FBS: fetal bovine serum; cDNA: complementary DNA.
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5.
  • Jensen, Pernille Linnert, et al. (författare)
  • Proteomic Analysis of Human Blastocoel Fluid and Blastocyst Cells
  • 2013
  • Ingår i: Stem Cells and Development. - 1547-3287 .- 1557-8534. ; 22:7, s. 1126-1135
  • Tidskriftsartikel (refereegranskat)abstract
    • Human embryonic stem cells (hESCs) are derived from the inner cell mass (ICM) of the blastocyst and can differentiate into any cell type in the human body. These cells hold a great potential for regenerative medicine, but in order to obtain enough cells needed for medical treatment, culture is required on a large scale. In the undifferentiated state, hESCs appear to possess an unlimited potential for proliferation but optimal, defined and safe culture conditions remains a challenge. The aim of the present study was to identify proteins in the natural environment of undifferentiated hESCs, namely the blastocoel fluid, which is in contact with all the cells in the blastocyst, including hESCs. Fifty-three surplus human blastocysts were donated after informed consent and blastocoel fluid was isolated by micromanipulation. Using highly sensitive nano high pressure liquid chromatography tandem mass spectrometry, 286 proteins were identified in the blastocoel fluid and 1307 proteins in the corresponding cells of the blastocyst. Forty-two were previously uncharacterized proteins - eight of these originated from the blastocoel fluid. Furthermore, several heat shock proteins (Hsp27, Hsp60, Hsc70 and Hsp90) were identified in blastocoel fluid together with zona pellucida proteins (ZP2-4), Vitamin D binding protein and Retinol binding protein. Proteins that regulate ciliary assembly and function were also identified, including Bardet-biedl syndrome protein 7. This study has identified numerous proteins which cells from the ICM of the human blastocyst are exposed to via the blastocoel fluid. These results can be an inspiration for the development of improved culture conditions for hESCs.
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6.
  • Kaihola, Helena, 1969-, et al. (författare)
  • Levels of caspase-3 and histidine-rich glycoprotein in the embryo secretome as biomarkers of good-quality day-2 embryos and high-quality blastocysts
  • 2019
  • Ingår i: PLOS ONE. - 1932-6203. ; 14:12
  • Tidskriftsartikel (refereegranskat)abstract
    • Morphological assessment at defined developmental stages is the most important method to select viable embryos for transfer and cryopreservation. Timing of different developmental stages in embryo development has been shown to correlate with its potential to develop into a blastocyst. However, improvements in pregnancy rates by using time-lapse techniques have been difficult to validate scientifically. Therefore, there is a need for new methods, preferably non-invasive methods based on metabolomics, genomics and proteomics, to improve the evaluation of embryo quality even further. The aim of this study was to investigate if different levels of caspase-3 and histidine-rich glycoprotein (HRG), secreted by the embryo into the culture media, can be used as biomarkers of embryo quality. In this study, a total of 334 samples of culture media were collected from in vitro fertilization (IVF) treatments at three different clinics. Protein analysis of the culture media was performed using multiplex proximity extension protein analysis to detect levels of caspase-3 and HRG in the embryo secretome. Protein levels were compared in secretome samples from high- and low-quality blastocysts and embryos that became arrested during development. Correlation between protein levels and time to morula formation was also analyzed. Furthermore, protein levels in secretomes from day-2 cultured embryos were compared on the basis of whether or not pregnancy was achieved. The results showed that caspase-3 levels were lower in secretomes from high-quality vs. low-quality blastocysts and those that became arrested (p ≤ 0.05 for both). In addition, higher HRG levels correlated with a shorter time to morula formation (p ≤ 0.001). Caspase-3 levels were also lower in secretomes from day-2 cultured embryos resulting in a pregnancy vs. those that did not (p ≤ 0.05). Furthermore, it was shown that caspase-3 might be used as a marker for predicting potential success rate after transfer of day-2 cultured embryos, where a caspase-3 cutoff level of 0.02 gave a prediction probability of 68% (p = 0.038). In conclusion, in future prediction models, levels of caspase-3 and HRG might be used as potential markers of embryo quality, and secreted caspase-3 levels could to some extent predict the outcome after transfer of day-2 cultured embryos.
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7.
  • Sun, Wei, 1981-, et al. (författare)
  • N-glycans of Human Protein C Inhibitor : Tissue-Specific Expression and Function
  • 2011
  • Ingår i: PLOS ONE. - 1932-6203. ; 6:12, s. e29011-
  • Tidskriftsartikel (refereegranskat)abstract
    • Protein C inhibitor (PCI) is a serpin type of serine protease inhibitor that is found in many tissues and fluids in human, including blood plasma, seminal plasma and urine. This inhibitor displays an unusually broad protease specificity compared with other serpins. Previous studies have shown that the N-glycan(s) and the NH(2)-terminus affect some blood-related functions of PCI. In this study, we have for the first time determined the N-glycan profile of seminal plasma PCI, by mass spectrometry. The N-glycan structures differed markedly compared with those of both blood-derived and urinary PCI, providing evidence that the N-glycans of PCI are expressed in a tissue-specific manner. The most abundant structure (m/z 2592.9) had a composition of Fuc(3)Hex(5)HexNAc(4), consistent with a core fucosylated bi-antennary glycan with terminal Lewis x. A major serine protease in semen, prostate specific antigen (PSA), was used to evaluate the effects of N-glycans and the NH(2)-terminus on a PCI function related to the reproductive tract. Second-order rate constants for PSA inhibition by PCI were 4.3 +/- 0.2 and 4.1 +/- 0.5 M(-1) s(-1) for the natural full-length PCI and a form lacking six amino acids at the NH(2)-terminus, respectively, whereas these constants were 4.8 +/- 0.1 and 29 +/- 7 M(-1) s(-1) for the corresponding PNGase F-treated forms. The 7-8-fold higher rate constants obtained when both the N-glycans and the NH(2-)terminus had been removed suggest that these structures jointly affect the rate of PSA inhibition, presumably by together hindering conformational changes of PCI required to bind to the catalytic pocket of PSA.
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