No (48)
Number of found documents:
48
Published from
to
Changes in the expression of selected testicular genes in mice
Valášková, Eliška; Margaryan, Hasmik; Žatecká, Eva; Pěknicová, Jana
2014 - English
The decrease in population fertility has become a major concern in many developed countries. Recent studies show that infertility is affecting an estimated 15% of all couples (World Health Organization, WHO, 2010). Male infertility is the primary or contributing cause in 60% of cases. Male infertility is caused by a number of factors, such as genetic background, various environmental factors and disease. Diabetes mellitus (DM), a serious health problem on its own, is also suspected to be a contributing factor to male infertility. The aim of this project was to analyze the cellular, molecular and genetic effects of diabetic environment on spermatogenesis and sperm quality and to determine the impact of DM on the in vivo reproduction, using the mouse model (Mus musculus) inbred FVB. Diabetes was induced using streptozotocin. We used our knowledge and tools (unique monoclonal antibodies developed by our group) to determine the status of reproductive organs, anogenital distance, and the quality of sperms. Genetic analysis was performed by a quantitative Reverse Transcription Polymerase Chain Reaction (qPCR). We tested selected genes which are expressed in testicular tissue and thus can influence process of spermatogenesis and consequently the sperm quality. Our preliminary data strongly suggest that DM impairs male fertility. We have found significant changes in the body and reproductive organ weight of mice with DM. We have identified qualitative and quantitative changes in the expression of proteins in epididymal fluid and sperms. We have also detected an increased number of apoptotic cells in sperm of diabetic mice compared to the control group. To our knowledge, there is no study assessing the correlation between DM and “unexplained infertility”. In view of this, it is essential to analyze the effects of DM on male fertility, sperm quality, and reproduction parameters.
Keywords:
diabetes mellitus; gene expression; reproduction
Available at various institutes of the ASCR
Changes in the expression of selected testicular genes in mice
The decrease in population fertility has become a major concern in many developed countries. Recent studies show that infertility is affecting an estimated 15% of all couples (World Health ...
The ubiquitin–proteasome system is involved in the regulation of activity of spermadhesin aqn1 and acrosin inhibitor, the two sperm surface proteins, during porcine fertilization
Jonáková, Věra; Yi, Y.J.; Postlerová, Pavla; Pěknicová, Jana
2014 - English
The spermadhesin AQN1and acrosin inhibitor (AI/SPINK2) proteins bind to the sperm plasma membrane at ejaculation. The AQN1 has been implicated in sperm binding to zona pellucida (ZP) of the oocyte as well as in sperm interactions with the epithelium of the oviductal sperm reservoir. The SPINK2 protects spermatozoa from proteolytic degradation during their trip up the female genital tract toward the oocyte. This study examined the role of two components of the 19S proteasome regulatory complex, the ubiquitin C-terminal hydrolase UCHL3 and PSMD8 in the AQN1-mediated boar sperm binding to zona pellucida. Interaction of PSMD4 subunit with the acrosomal surface-associated acrosin inhibitor AI/SPINK2 provided another line of evidence for the presence of 26S proteasomes on the sperm surface. Detection of the ubiquitinated forms of SPINK2 supports the hypothesis that SPINK2 activity is controlled by ubiquitin-proteasome system (UPS). The activity of the porcine AQN1, and thus the efficiency of sperm-oocyte recognition/binding, may be controlled by elements of the sperm surface-bound UPS, in particular by UCHL3, and by proteasomal regulatory complex subunit PSMD8. Ubiquitinated isoforms of AQN1 were also detected in boar sperm extracts. The UCHL inhibitor ubiquitin aldehyde and the antibodies against UCHL3 or PSMD8 increased the rate of sperm-ZP penetration and polyspermy during porcine in vitro fertilization (IVF). In contrast, the addition of recombinant UCHL3 to fertilization medium significantly reduced polyspermy rates, while maintaining satisfactory rate of monospermic fertilization (~50%). These results are significant for production agriculture. The high level of polyspermy that hinders porcine IVF for commercial embryo transfer could be mitigated by the modulation of the UCHL3 and/or PSMD8 activity.
Keywords:
ubiquitin-proteasome system; acrosin inhibitor; spermadhesin AQN1
Available at various institutes of the ASCR
The ubiquitin–proteasome system is involved in the regulation of activity of spermadhesin aqn1 and acrosin inhibitor, the two sperm surface proteins, during porcine fertilization
The spermadhesin AQN1and acrosin inhibitor (AI/SPINK2) proteins bind to the sperm plasma membrane at ejaculation. The AQN1 has been implicated in sperm binding to zona pellucida (ZP) of the oocyte as ...
Endocrine disruptors induce transgenerational alterations of the male reproductive parameters and mirna expression profiles in mouse primordial germ cells
Děd, Lukáš; Brieno-Enríquez, M.A.; García-López, J.; Cárdenas, D.B.; Guibert, S.; Hourcade, J.de D.; Pěknicová, Jana; Weber, M.; del Mazo, J.
2014 - English
Primordial germ cells (PGCs) are the embryonic precursors of the germ cell linage, which are restricted to form only sperm and oocytes following their specification from pluripotent cells. PGC precursors are specified in the epiblast around 6.25 days post coitum (dpc), and around 7.25 dpc become identifiable in a 40 cell-cluster. In the present study, we used a mouse model to evaluate the trans-generational (F1-F3) effects of vinclozolin (VCZ) administrated in two doses on male reproductive parameters. We observed decreased fertility rate, higher apoptotic rate and histopathologic alterations in adult testis, PGC number reduction, increments of PGCs apoptosis and changes in PGCs gene expression among all three generations. In the attempt to clarify the trans-generational transmition of the altered phenotypes, we performed the microRNA expression and DNA methylation analysis. We observed the significant alteration in the expression of multiple microRNA and microRNA-regulated genes which are important for PGCs specification, including LIN28, let-7 and BLIMP1. Trans-generational deregulation in the expression of factors involved in the Lin28-let-7-Blimp1 pathway can lead to specific VCZ-induced phenotype observed in our study.
Keywords:
endocrine disruptor; miRNA expression; primordial germ cells; vinclozolin; DNA methylation
Available at various institutes of the ASCR
Endocrine disruptors induce transgenerational alterations of the male reproductive parameters and mirna expression profiles in mouse primordial germ cells
Primordial germ cells (PGCs) are the embryonic precursors of the germ cell linage, which are restricted to form only sperm and oocytes following their specification from pluripotent cells. PGC ...
Book of abstracts XXth Symposium of Biology and Immunology of Reproduction with international participation
Pěknicová, Jana; Kubátová, Alena; Elzeinová, Fatima
2014 - English
Book of abstracts. The Symposium was focused on immunology of reproduction and specific problems in reproduction (mainly in human infertility).
Keywords:
reproduction; immunoglobulins; monoclonal antibody; endocrine disruptors; oocytes; infection
Available at various institutes of the ASCR
Book of abstracts XXth Symposium of Biology and Immunology of Reproduction with international participation
Book of abstracts. The Symposium was focused on immunology of reproduction and specific problems in reproduction (mainly in human infertility).
Konferenční sborník XVIII. symposium českých reprodukčních imunologů s mezinárodní účastí
Pěknicová, Jana; Elzeinová, Fatima; Kubátová, Alena
2012 - English
Book of abstract XVIIth Symposium of Czech Reproductive Immunologist with international participation contains abstracts of lectures which focuse on immunology and physiology of reproduction.
Keywords:
immunology of reproduction; autoimmune diseases; antibodies; spermatozoa; oocytes; proteins; endocrine disruptors
Available at various institutes of the ASCR
Konferenční sborník XVIII. symposium českých reprodukčních imunologů s mezinárodní účastí
Book of abstract XVIIth Symposium of Czech Reproductive Immunologist with international participation contains abstracts of lectures which focuse on immunology and physiology of reproduction.
METODICKÉ DOPORUČENÍ PRO VYKAZOVÁNÍ SKUTEČNÝCH ZPŮSOBILÝCH NEPŘÍMÝCH NÁKLADŮ NA PROJEKT PRO ÚSTAVY AV ČR
Škoda, Jan; Starosta, Karel
2012 - Czech
Metodické doporučení si klade za cíl formulovat společné možné zásady pro pracoviště AV ČR týkající se alokace nepřímých nákladů na projekty a to především s ohledem na pravidla poskytovatelů, kteří přiřazování nepřímých nákladů metodou full cost vyžadují. Metodika vychází z obvyklých hospodářských a účetních postupů ústavů AV ČR. Navrhované řešení je založeno na maximální jednoduchosti a efektivnosti s cílem minimálního navýšení nepřímých nákladů zapříčiněných užíváním této metodiky, umožňuje zakončení hospodářského roku v řádném termínu a vykázání potřebných dat poskytovatelům. The aim of the Methodical Recommendation is to create possible common principles for institutes of the Academy of Sciences of the Czech Republic (AS CR) concerning the allocation of indirect costs to projects, considering mainly the rules of fund providers requesting reporting of real costs via full cost methodology. Proposed methodology is based on usual management and accounting practices of institutes of AS CR and lie in principles of maximum simplicity and effectiveness. It should result in minimum increase of real indirect costs caused by application of such methodology, it enables closing of economic year on time and also reporting of necessary data to fund providers.
Keywords:
AS CR; overheads; indirect costs; full cost
Available at various institutes of the ASCR
METODICKÉ DOPORUČENÍ PRO VYKAZOVÁNÍ SKUTEČNÝCH ZPŮSOBILÝCH NEPŘÍMÝCH NÁKLADŮ NA PROJEKT PRO ÚSTAVY AV ČR
Metodické doporučení si klade za cíl formulovat společné možné zásady pro pracoviště AV ČR týkající se alokace nepřímých nákladů na projekty a to především s ohledem na pravidla poskytovatelů, kteří ...
Book of abstract XVIIth Symposium of Czech Reproductive Immunologist with international participation
Pěknicová, Jana; Elzeinová, Fatima; Cozlová, Nina
2011 - English
Book of abstract XVIIth Symposium of Czech Reproductive Immunologist with international participation contains abstracts of lectures which focuse on immunology and physiology of reproduction.
Keywords:
immunology of reproduction; autoimmune diseases; antibodies; spermatozoa; oocytes; proteins; endocrine disruptors
Available at various institutes of the ASCR
Book of abstract XVIIth Symposium of Czech Reproductive Immunologist with international participation
Book of abstract XVIIth Symposium of Czech Reproductive Immunologist with international participation contains abstracts of lectures which focuse on immunology and physiology of reproduction.
The effect of low dose of vinclozolin on reproductive tract development in CD1 outbred mice
Elzeinová, Fatima; Pěknicová, Jana; Nováková, Vendula; Buckiová, Daniela; Kubátová, Alena
2008 - English
The effect of a low dose of vinclozolin within the development of the reproductive tract during gestation (VIN-GD 15-22) and puberty (VIN-PND 23-44) in CD1 mice was tested. We found a decrease in the anogenital distance, prostate weight and pathology of testes in both experimental groups. Sperm counts decreased to 46% (VIN-GD) and to 81% (VIN-PND), and also the acrosomal state (evaluated by antiacrosomal antibody) decreased in both groups to 89% in comparison to the control group (100%). Sperm head abnormalities increased by approximately 18% and 13%, respectively. In this connection, the expression of some genes was changed (arosome-related gene (Acr), apoptosis related genes (p53, p21)). In conclusion, a low dose of vinclozolin affected the reproductive tract, sperm parameters and expression of selected genes in both experimental groups.
Keywords:
vinclozolin; CD1 mouse; spermatozoa
Available at various institutes of the ASCR
The effect of low dose of vinclozolin on reproductive tract development in CD1 outbred mice
The effect of a low dose of vinclozolin within the development of the reproductive tract during gestation (VIN-GD 15-22) and puberty (VIN-PND 23-44) in CD1 mice was tested. We found a decrease in the ...
Vliv endokrinních disruptorů na reprodukci savců
Pěknicová, Jana; Nováková, Vendula; Buckiová, Daniela; Boubelík, Michael; Elzeinová, Fatima; Kubátová, Alena
2008 - Czech
Endocrine system is one of the most important regulatory systems in the mammalian body. The endocrine disruptors (ED) can disrupt the function of the endocrine system but their activity is not a result of the physiological regulation. The effect of low dose of selected ED, bisphenol-A (BPA), p-nonylphenol (NP), diethylstilbestrol (DES), genistein (GEN), resveratrol (RES)), hormone (17α-ethynylestradiol (EE2)) and polybrominated compound (tetrabromobisphenol A (TBBPA)) within development of reproductive tract in outbred CD1 mice was tested. BPA and NP had a negative effect on reproductive organs morphology and mouse spermatozoa. The fertility of mice exposed to DES was disrupted. Contrary to that, treatment by GEN and RES had no effect on the fertility of mice but had some effect on their reproductive parameters except for sperm integrity. Synthetic hormone (EE2) and polybrominated compound (TBBPA) also affected on the organ weight, reproductive parameters and sperm quality.
Keywords:
endocrine disruptor; xenoestrogen; phytoestrogen; sperm integrity
Available at various institutes of the ASCR
Vliv endokrinních disruptorů na reprodukci savců
Endocrine system is one of the most important regulatory systems in the mammalian body. The endocrine disruptors (ED) can disrupt the function of the endocrine system but their activity is not a ...
Monoklonální protilátky rozpoznávající proteiny lidské semenné plazmy
Čapková, Jana; Elzeinová, Fatima; Margaryan, Hasmik; Koubek, Pavel; Pěknicová, Jana
2008 - Czech
Ustavili jsme panel monoklonálních protilátek protil lidským spermiím (Hs- serie, Praha) a charakterizovali jsme je pomocí imunofluorescence, Western bloting techniky a MALDI analýzy. V našem panelu Hs- protilátek několik protilátek reagovalo s proteiny lidské semenné plasmy. Tyto protilátky mohou být užitečné pro studium kapacitace spermií a hodnocení kvality spermatu. We have generated a set of monoclonal antibodies to human spermatozoa (Hs- serie, Prague) and characterized them using immunofluorescence, Western bloting and MALDI analysis. In our panel of Hs- antibodies several antibodies specifically reacted with human seminal plasma proteins. These antibodies might be useful for study sperm capacitation and sperm quality assessment.
Keywords:
monoclonal antibody; seminal plasma; spermatozoa
Available at various institutes of the ASCR
Monoklonální protilátky rozpoznávající proteiny lidské semenné plazmy
Ustavili jsme panel monoklonálních protilátek protil lidským spermiím (Hs- serie, Praha) a charakterizovali jsme je pomocí imunofluorescence, Western bloting techniky a MALDI analýzy. V našem panelu ...
NRGL provides central access to information on grey literature produced in the Czech Republic in the fields of science, research and education. You can find more information about grey literature and NRGL at service web
Send your suggestions and comments to nusl@techlib.cz
Provider
Other bases