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Pimentel RN, Navarro PA, Wang F, Robinson LG, Cammer M, Liang F, Kramer Y, Keefe DL. Amyloid-like substance in mice and human oocytes and embryos. J Assist Reprod Genet 2019; 36:1877-1890. [PMID: 31332596 DOI: 10.1007/s10815-019-01530-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Accepted: 07/09/2019] [Indexed: 11/30/2022] Open
Abstract
PURPOSE To identify and characterize amyloid-like substance (ALS) in human and mouse oocytes and preimplantation embryos. METHODS An experimental prospective pilot study. A total of 252 mouse oocytes and preimplantation embryos and 50 immature and in vitro matured human oocytes and parthenogenetic human embryos, from 11 consenting fertility patients, ages 18-45. Fluorescence intensity from immunofluorescent staining and data from confocal microscopy were quantified. Data were compared by one-way analysis of variance, with the least square-MEANS post-test, Pearson correlation coefficients (r), and bivariate analyses (t tests). ALS morphology was verified using transmission electron microscopy. RESULTS Immunostaining for ALS appears throughout the zona pellucida, as well as in the cytoplasm and nucleus of mouse and human oocytes, polar bodies, and parthenogenetic embryos, and mouse preimplantation embryos. In mouse, 2-cell embryos exhibited the highest level of ALS (69000187.4 ± 6733098.07). Electron microscopy confirmed the presence of ALS. In humans, fresh germinal vesicle stage oocytes exhibited the highest level of ALS (4164.74088 ± 1573.46) followed by metaphase I and II stages (p = 0.008). There was a significant negative association between levels of ALS and patient body mass index, number of days of ovarian stimulation, dose of gonadotropin used, time between retrieval and fixation, and time after the hCG trigger. Significantly higher levels of ALS were found in patients with AMH between 1 and 3 ng/ml compared to < 1 ng/ml. CONCLUSION We demonstrate for the first time the presence, distribution, and change in ALS throughout some stages of mouse and human oocyte maturation and embryonic development. We also determine associations between ALS in human oocytes with clinical characteristics.
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Affiliation(s)
- Ricardo N Pimentel
- Research Scientist from the Department of Obstetrics and Gynecology, New York University School of Medicine, 550 First Avenue, NBV 9N1, New York, NY, USA.,Human Reproduction Division, Department of Obstetrics and Gynecology, Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Paula A Navarro
- Human Reproduction Division, Department of Obstetrics and Gynecology, Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Fang Wang
- Department of Obstetrics and Gynecology, Langone Medical Center, New York University, New York, NY, USA
| | - LeRoy G Robinson
- Department of Obstetrics and Gynecology, Langone Medical Center, New York University, New York, NY, USA
| | - Michael Cammer
- DART Microscopy Laboratory, New York University School of Medicine, New York, NY, USA
| | - Fengxia Liang
- DART Microscopy Laboratory, New York University School of Medicine, New York, NY, USA
| | - Yael Kramer
- Department of Obstetrics and Gynecology, Langone Medical Center, New York University, New York, NY, USA
| | - David Lawrence Keefe
- Department of Obstetrics and Gynecology, Langone Medical Center, New York University, New York, NY, USA.
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Tavares RS, Martins S, Almeida-Santos T, Sousa AP, Ramalho-Santos J, da Cruz E Silva OA. Alzheimer's disease-related amyloid-β 1-42 peptide induces the loss of human sperm function. Cell Tissue Res 2017; 369:647-651. [PMID: 28776187 DOI: 10.1007/s00441-017-2665-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 06/23/2017] [Indexed: 11/25/2022]
Abstract
Characteristically identified as the main component of senile plaques present in patients suffering from Alzheimer's disease, Aβ has been detected in human testis and reproductive fluids, but its effect on spermatozoa has not been addressed. The present study evaluated whether the most toxic and aggregant amyloid precursor protein (APP)-proteolytic product, amyloid-β1-42 (Aβ1-42), was capable of affecting sperm functionality. Normozoospermic samples were either exposed to different Aβ1-42 doses or to the untreated and scrambled controls for a maximum of 48 h at 37 °C and 5%CO2, and motility, viability and mitochondrial status were evaluated. Additionally, tyrosine phosphorylation was analyzed by immunocytochemistry and acrosomal integrity through PSA-FITC. A shorter treatment period was used to monitor prompt Ca2+ responses. Aβ1-42 peptide decreased motility before inducing mitochondrial impairment (p < 0.05; n = 6). Both outcomes became more pronounced with time, reaching their maximal decrease at 48 h, where even 1 μM produced undesirable effects (p < 0.05; n = 6). Aβ1-42 peptide also decreased cell survival (p < 0.05; n = 6). Furthermore, although no effects on tyrosine phosphorylation were observed (p > 0.05; n = 6), reduced acrosomal integrity was detected (p < 0.05; n = 7), which was not correlated with viability loss (p > 0.05). In parallel, all Aβ1-42 concentrations elicited a [Ca2+]i rise but a significant difference was only observed at 20 μM (p < 0.05; n = 7) and a tendency was obtained with 10 μM (p = 0.053; n = 7). In conclusion, Aβ1-42 peptide oligomers impair sperm function in vitro, although further studies are required to determine the clinical relevance of these findings.
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Affiliation(s)
- R S Tavares
- Neuroscience and Cell Signalling Group, Department of Medical Sciences, Institute of Biomedicine - iBiMED, University of Aveiro, 3810-193, Aveiro, Portugal.,Biology of Reproduction and Stem Cell Group, CNC- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504, Coimbra, Portugal
| | - S Martins
- Neuroscience and Cell Signalling Group, Department of Medical Sciences, Institute of Biomedicine - iBiMED, University of Aveiro, 3810-193, Aveiro, Portugal
| | - T Almeida-Santos
- Biology of Reproduction and Stem Cell Group, CNC- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504, Coimbra, Portugal.,Reproductive Medicine Service, University Hospitals of Coimbra, 3000-075, Coimbra, Portugal.,Faculty of Medicine, University of Coimbra, 3000-548, Coimbra, Portugal
| | - A P Sousa
- Biology of Reproduction and Stem Cell Group, CNC- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504, Coimbra, Portugal.,Reproductive Medicine Service, University Hospitals of Coimbra, 3000-075, Coimbra, Portugal
| | - J Ramalho-Santos
- Biology of Reproduction and Stem Cell Group, CNC- Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504, Coimbra, Portugal. .,Department of Life Sciences, Faculty of Sciences and Technology, University of Coimbra, Calçada Martins de Freitas, 3000-456, Coimbra, Portugal.
| | - O A da Cruz E Silva
- Neuroscience and Cell Signalling Group, Department of Medical Sciences, Institute of Biomedicine - iBiMED, University of Aveiro, 3810-193, Aveiro, Portugal.,Department of Medical Sciences, University of Aveiro, 3810-193, Aveiro, Portugal
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