Exposure to bisphenols has been found to have adverse effects on male reproductive function in animals. Human exposure to bisphenols is widespread. Bisphenol A (BPA) and its analogues, including bisphenol S (BPS), bisphenol F (BPF), and bisphenol AF (BPAF) are utilized in various consumer products such as food contact materials and dental resins. The effects of these compounds on male fertility and spermatogenesis are unclear and findings from human studies are inconsistent. In this cross-sectional study, we evaluated the influence of BPA, BPS, BPF, BPAF (BPs) measured in semen on number of spermatozoa, total motility, progressive motility, morphology, and DNA fragmentation. We also examined the association of bisphenols (BPs) exposure with patients' occupation. A total of 358 patients aged 17-62 years with BMI 18-42 were included in the study from 2019 to 2021. BPs were extracted using solvent extraction followed by preconcentration step and determined by high-performance liquid chromatography and tandem mass spectrometry (LC/MSMS). Bisphenols were detected in 343 from 349 analysed samples (98.3% of all the samples). In 6 samples, the concentration of all BPs was under the limit of detection and in 20 samples under the limit of quantification. We did not find a statistically significant relationship between occupation and BPs. However, we observed significant correlations between the concentration of BPA and a lower motility and normal morphology. For BPS, a significant correlation with a lower ejaculate volume and a lower total sperm count was found. BPF and BPAF were detected only in 14.3% and 23.9% of samples, respectively. For BPF and BPAF, no significant correlations with spermiogram parameters were observed. Our results show that BPs are widespread in the male population (more than 90% of analysed samples), independently of an occupation and in case of BPA and BPS having a negative impact on spermiogram parameters.
- MeSH
- benzhydrylové sloučeniny * toxicita analýza MeSH
- fenoly * MeSH
- fluorokarbony * MeSH
- lidé MeSH
- průřezové studie MeSH
- sperma * MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
Congenital erythrocytoses represent a heterogenous group of rare defects of erythropoiesis characterized by elevated erythrocyte mass. We performed molecular-genetic analysis of 21 Czech patients with congenital erythrocytosis and assessed the mutual link between chronic erythrocyte overproduction and iron homoeostasis. Causative mutations in erythropoietin receptor (EPOR), hypoxia-inducible factor 2 alpha (HIF2A) or Von Hippel-Lindau (VHL) genes were detected in nine patients, including a novel p.A421Cfs*4 EPOR and a homozygous intronic c.340+770T>C VHL mutation. The association and possible cooperation of five identified missense germline EPOR or Janus kinase 2 (JAK2) variants with other genetic/non-genetic factors in erythrocytosis manifestation may involve variants of Piezo-type mechanosensitive ion channel component 1 (PIEZO1) or Ten-eleven translocation 2 (TET2), but this requires further research. In two families, hepcidin levels appeared to prevent or promote phenotypic expression of the disease. No major contribution of heterozygous haemochromatosis gene (HFE) mutations to the erythrocytic phenotype or hepcidin levels was observed in our cohort. VHL- and HIF2A-mutant erythrocytosis showed increased erythroferrone and suppressed hepcidin, whereas no overproduction of erythroferrone was detected in other patients regardless of molecular defect, age or therapy. Understanding the interplay between iron metabolism and erythropoiesis in different subgroups of congenital erythrocytosis may improve current treatment options.
- MeSH
- hepcidiny genetika MeSH
- iontové kanály genetika MeSH
- kyslík metabolismus MeSH
- lidé MeSH
- mutace MeSH
- polycytemie * genetika MeSH
- receptory erythropoetinu genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
S rychlým rozvojem oborů transfuzní, transplantační a regenerační medicíny se pojí nutnost informovat o připravovaných legislativních změnách na úrovni Evropské unie (EU) a stručně popsat a porovnat náročnost některých dárcovských procedur z pohledu živého dárce i s jejich riziky, včetně psychosociálních. Tato práce je postavena na kvalitativním expertním šetření. Porovnání náročnosti procedur z pohledu dárců je důležité například pro nastavení kompenzací. Z tabulek vyplývá, že současné kompenzace jsou v nepoměru.
Transfusion, transplantation, and regenerative medicine are rapidly developing fields. The authors of the text want to inform about upcoming legislative changes at the EU level and briefly describe and compare the difficulty of some donation procedures from the point of view of a living donor, as well as their risks, including psychosocial risks. The study is based on a qualitative expert investigation. Comparing the complexity of procedures from the perspective of donors is important, for example, for setting compensations. The tables show that the current compensations are disproportionate.
- MeSH
- dárci krve MeSH
- dárci tkání MeSH
- darování oocytu MeSH
- lidé MeSH
- získávání tkání a orgánů * zákonodárství a právo MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- přehledy MeSH
Exposure to endocrine disruptors such as bisphenols, can lead to and be the explanation for idiopathic infertility. In our study, we assessed the effect of exposure to bisphenol S (BPS) via breast milk on the testicular tissue health of adult male mice. Lactating dams were exposed to BPS through drinking water (0.216 ng g bw/day and 21.6 ng g bw/day) from post-natal day 0-15. Although there was no significant difference in testicular histopathology between the control and experimental groups, we observed an increase in the number of tight and gap junctions in the blood-testis barrier (BTB) of adult mice after lactation BPS exposure. Moreover, there was an increase in oxidative stress markers in adult testicular tissue of mice exposed via breast milk. Our lactation model indicates that breast milk is a route of exposure to an endocrine disruptor that can be responsible for idiopathic male infertility through the damage of the BTB and weakening of oxidative stress resistance in adulthood.
Exposure to bisphenols is related to negative effects on male reproduction. The bisphenols exposure is associated with several modes of action including negative impact on the blood-testis barrier (BTB) in testes or direct effect on spermatozoa. Bisphenols have been detected in human seminal plasma, but the possible mechanism of seminal transfer of bisphenols is not clear. Some authors consider the transfer through the blood-testis barrier to be crucial. Therefore, in this work, we compared normozoospermic men and men after vasectomy who have interrupted vas deferens and their ejaculate does not contain testicular products. We measured the concentration of bisphenol A (BPA), bisphenol S (BPS) and bisphenol F (BPF) in the urine and seminal plasma of these men using liquid chromatography tandem mass spectrometry (LC/MSMS). We found that the ratio of urinary and seminal plasma content of bisphenols did not differ in normozoospermic men or men after vasectomy. From the obtained data, it can be concluded that the pathways of transport of bisphenols into seminal plasma are not primarily through the testicular tissue, but this pathway is applied similarly to other routes of transmission by a corresponding ejaculate volume ratio. To a much greater extent than through testicular tissue, bisphenols enter the seminal plasma mainly as part of the secretions of the accessory glands.
- Publikační typ
- časopisecké články MeSH
Male fertility has been deteriorating worldwide for considerable time, with the greatest deterioration recorded mainly in the United States, Europe countries, and Australia. That is, especially in countries where an abundance of chemicals called endocrine disruptors has repeatedly been reported, both in the environment and in human matrices. Human exposure to persistent and non-persistent chemicals is ubiquitous and associated with endocrine-disrupting effects. This group of endocrine disrupting chemicals (EDC) can act as agonists or antagonists of hormone receptors and can thus significantly affect a number of physiological processes. It can even negatively affect human reproduction with an impact on the development of gonads and gametogenesis, fertilization, and the subsequent development of embryos. The negative effects of endocrine disruptors on sperm gametogenesis and male fertility in general have been investigated and repeatedly demonstrated in experimental and epidemiological studies. Male reproduction is affected by endocrine disruptors via their effect on testicular development, impact on estrogen and androgen receptors, potential epigenetic effect, production of reactive oxygen species or direct effect on spermatozoa and other cells of testicular tissue. Emerging scientific evidence suggests that the increasing incidence of male infertility is associated with the exposure to persistent and non-persistent endocrine-disrupting chemicals such as bisphenols and perfluoroalkyl chemicals (PFAS). These chemicals may impact men's fertility through various mechanisms. This study provides an overview of the mechanisms of action common to persistent (PFAS) and nonpersistent (bisphenols) EDC on male fertility.
- Publikační typ
- časopisecké články MeSH
- přehledy MeSH
Český národní registr dárců dřeně (ČNRDD) byl založen v roce 1992 s cílem nalézt včas optimálního „národního“ dárce pro české pacienty, případně zajistit dárce ze zahraničí. V současnosti (k 31. 10. 2018) jeho databáze obsahuje 83 000 dárců a medián věku všech aktivních dárců v registru je 32 let. Na základě preferencí transplantačních center, tj. větší míry požadavků na mladší dárce, jakož i z ekonomických důvodů, snížil ČNRDD v roce 2009 maximální věkovou hranici vstupu do registru na 35 let. Cílem naší práce bylo zhodnotit, jak dalece se tato restriktivní kritéria a celkovou strategii náboru zaměřenou na mladé muže dařilo dodržet, zhodnotit kvantitativní i kvalitativní parametry náboru v letech 2013–2017. V letech 2013–2017 se nábor nových dárců pohyboval mezi 5 000–10 000/rok. Celkem bylo v tomto období zařazeno 36 720 dárců. Zastoupení pohlaví mezi nově registrovanými dárci je v posledních letech téměř vyrovnané. Medián věku registrovaných dárců v celém sledovaném období byl 27 let. Tento masivní nábor mladých dárců vedl k průběžnému snížení mediánu věku dárců celé databáze ČNRDD. Prezentované údaje jednoznačně dokládají efektivitu aktuální náborové strategie ČNRDD, protože v uplynulých letech došlo k výraznému snížení mediánu věku dárců celé databáze ČNRDD a současně nárůstu podílu mužů. To je v souladu s preferencí transplantačních center, která na podkladě publikovaných dat upřednostňují mladé dárce, a to především muže. Má-li být současná náborová strategie ČNRDD nadále úspěšná, je nezbytná trvající dobrá spolupráce dárcovských a náběrových center registru i práce dobrovolných spolupracovníků.
The Czech National Marrow Donors Registry (CNMDR) was established in 1992 to find an optimal „national" donor for Czech patients or to provide a donor from abroad as soon as possible. The current state of the CNMDR database (to October 31, 2018) stands at 83.000 donors and the median age of all active donors in the registry is 32 years. Given the transplant centres' preference for younger donors and for economic reasons, the CNMDR reduced the maximum age limit for entry into the registry to 35 years in 2009. The aim of our work was to evaluate the success of this age restriction and general recruitment strategy focusing on young males and to evaluate the quantitative and qualitative recruitment parameters in 2013–2017. Between 2013 and 2017, the recruitment of new donors ranged from 5.000 to 10.000/year. In total, 36.720 donors were recruited during this period. Newly recruited donor gender distribution has been almost equally balanced in recent years. The average median age of recruited donors was 27 years. This massive recruitment of young donors led to a continuous reduction of the CNMDR database donor median age. The presented data clearly demonstrate the effectiveness of the current CNMDR recruitme strategy. In the past years, there has been a significant decrease in the donor age median as well as an increase in male donor contribution. This is in accordance with the preferences of transplant centres that prefer young donors especially males, based on published data. For this recruitment strategy to remain successful, the CNMDR will need to maintain its continued good cooperation with donor and recruitment centres as well as with volunteers.
- Klíčová slova
- nábor,
- MeSH
- dárci tkání * statistika a číselné údaje MeSH
- dospělí MeSH
- kostní dřeň MeSH
- lidé MeSH
- mladý dospělý MeSH
- registrace MeSH
- výběr dárců statistika a číselné údaje MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Geografické názvy
- Česká republika MeSH
