Barth syndrome (BTHS) is an inherited mitochondrial disorder characterized by a decrease in total cardiolipin and the accumulation of its precursor monolysocardiolipin due to the loss of the transacylase enzyme tafazzin. However, the molecular basis of BTHS pathology is still not well understood. Here we characterize the double mutant pgc1Δtaz1Δ of Saccharomyces cerevisiae deficient in phosphatidylglycerol-specific phospholipase C and tafazzin as a new yeast model of BTHS. Unlike the taz1Δ mutant used to date, this model accumulates phosphatidylglycerol, thus better approximating the human BTHS cells. We demonstrate that increased phosphatidylglycerol in this strain leads to more pronounced mitochondrial respiratory defects and an increased incidence of aberrant mitochondria compared to the single taz1Δ mutant. We also show that the mitochondria of the pgc1Δtaz1Δ mutant exhibit a reduced rate of respiration due to decreased cytochrome c oxidase and ATP synthase activities. Finally, we determined that the mood-stabilizing anticonvulsant valproic acid has a positive effect on both lipid composition and mitochondrial function in these yeast BTHS models. Overall, our results show that the pgc1Δtaz1Δ mutant better mimics the cellular phenotype of BTHS patients than taz1Δ cells, both in terms of lipid composition and the degree of disruption of mitochondrial structure and function. This favors the new model for use in future studies.
- MeSH
- acyltransferasy metabolismus MeSH
- Barthův syndrom * metabolismus MeSH
- fenotyp MeSH
- fosfatidylglyceroly * antagonisté a inhibitory metabolismus MeSH
- kardiolipiny * genetika metabolismus MeSH
- lidé MeSH
- Saccharomyces cerevisiae metabolismus MeSH
- transkripční faktory metabolismus MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Complex I (NADH dehydrogenase) is the first enzyme in the respiratory chain. It catalyses the electron transfer from NADH to ubiquinone that is associated with proton pumping out of the matrix. In this study, we characterized NADH dehydrogenase activity in seven monoxenous trypanosomatid species: Blechomonas ayalai, Herpetomonas tarakana, Kentomonas sorsogonicus, Leptomonas seymouri, Novymonas esmeraldas, Sergeia podlipaevi and Wallacemonas raviniae. We also investigated the subunit composition of the complex I in dixenous Phytomonas serpens, in which its presence and activity have been previously documented. In addition to P. serpens, the complex I is functionally active in N. esmeraldas and S. podlipaevi. We also identified 24-32 subunits of the complex I in individual species by using mass spectrometry. Among them, for the first time, we recognized several proteins of the mitochondrial DNA origin.
OBJECTIVE: To evaluate the association between cervical human papillomavirus (HPV) infection at the time of admission and the presence of microbial invasion of the amniotic cavity (MIAC) and intra-amniotic inflammation (IAI) in women with preterm prelabor rupture of membranes (PPROM) and to determine the association between cervical HPV infection and short-term neonatal morbidity. METHODS: One hundred women with singleton pregnancies complicated by PPROM between the gestational ages of 24+0 and 36+6 weeks were included in the study. The presence of HPV DNA was evaluated in scraped cervical cells using polymerase chain reaction (PCR). Amniotic fluid samples were obtained by transabdominal amniocentesis. RESULTS: The rate of cervical HPV infection in women with PPROM was 24%. The rates of MIAC and IAI were not different between women with cervical HPV infection and those without cervical HPV infection [MIAC: with HPV: 21% (5/24) vs. without HPV: 22% (17/76), p = 1.00; IAI: with HPV: 21% (5/24) vs. without HPV: 18% (14/76), p = 0.77]. There were no differences in the selected aspects of short-term neonatal morbidity between women with and without cervical HPV infection. CONCLUSIONS: In women with PPROM, the presence of cervical HPV infection at the time of admission is not related to a higher risk of intra-amniotic infection-related and inflammatory complications or worse short-term neonatal outcomes.
- MeSH
- cervix uteri virologie MeSH
- dospělí MeSH
- infekce papilomavirem komplikace MeSH
- kojenec MeSH
- kojenecká mortalita MeSH
- lidé MeSH
- novorozenec MeSH
- Papillomaviridae fyziologie MeSH
- plodová voda virologie MeSH
- předčasný odtok plodové vody virologie MeSH
- příjem pacientů MeSH
- těhotenství MeSH
- Check Tag
- dospělí MeSH
- kojenec MeSH
- lidé MeSH
- novorozenec MeSH
- těhotenství MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
In yeast, phosphatidylglycerol (PG) is a minor phospholipid under standard conditions; it can be utilized for cardiolipin (CL) biosynthesis by CL synthase, Crd1p, or alternatively degraded by the phospholipase Pgc1p. The Saccharomyces cerevisiae deletion mutants crd1Δ and pgc1Δ both accumulate PG. Based on analyses of the phospholipid content of pgc1Δ and crd1Δ yeast, we revealed that in yeast mitochondria, two separate pools of PG are present, which differ in their fatty acid composition and accessibility for Pgc1p-catalyzed degradation. In contrast to CL-deficient crd1Δ yeast, the pgc1Δ mutant contains normal levels of CL. This makes the pgc1Δ strain a suitable model to study the effect of accumulation of PG per se. Using fluorescence microscopy, we show that accumulation of PG with normal levels of CL resulted in increased fragmentation of mitochondria, while in the absence of CL, accumulation of PG led to the formation of large mitochondrial sheets. We also show that pgc1Δ mitochondria exhibited increased respiration rates due to increased activity of cytochrome c oxidase. Taken together, our results indicate that not only a lack of anionic phospholipids, but also excess PG, or unbalanced ratios of anionic phospholipids in mitochondrial membranes, have harmful consequences on mitochondrial morphology and function.
- MeSH
- fosfatidylglyceroly metabolismus MeSH
- fosfolipasy fyziologie MeSH
- kardiolipiny biosyntéza MeSH
- mitochondrie metabolismus ultrastruktura MeSH
- respirační komplex IV metabolismus MeSH
- Saccharomyces cerevisiae metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
Závěrečná zpráva o řešení grantu Interní grantové agentury MZ ČR
1 svazek : ilustrace, tabulky ; 30 cm
Dosažení patologické kompletní odpovědi po neoadjuvantní chemoterapii je ukazatelem dlouhodobé kontroly onemocnění. V předchozím projektu byla patologická kompletní odpověď pozorována významně častěji u nemocných s nádory expresí HER-2 a bez exprese HER-2 i hormonálních receptorů. Cílem předkládaného projektu je studovat biologickou odpověď na neoadjuvantní chemoterapii. Použity budou standardní režimy chemoterapie používané v jednotlivých centrech a volbu léčby projekt neovlivní. V retrospektivní studii na materiálu nemocných z 2 center budou vyhodnoceny rozdíly tumor infiltrujících lymfocytů u nemocných s různým fenotypem nádoru, bude také studován vliv exprese indoleamin 2,3-dioxygenázy na přítomnost tumor infiltrujících lymfocytů a bude provedeno imunohistochemické zhodnocení fenotypu nádoru. Budou rovněž sledovány změny metabolismu železa a citrulin, ukazatel toxicity léčby.; Pathologic complete response is an indicator of long-term disease control after neoadjuvant chemotherapy in breast carcinoma. In our earlier study, patologic complete response was observed significantly more often in patients with tumors expressing HER-2 or triple negative tumors. The aim of the present study is to study biologic response to neoadjuvant chemotherapy in patients treated with standard regimens that will not be affected by the project. In a retrospective study on material from patients in 2 centers difference in tumor infiltrating lymphocytes in patients with different tumor phenotype as well as the association between indoleamine 2,3-dioxygenase expression and the presence of tumor infiltrating lymphocytes will be evaluated together with tumor phenotype using immunohistochemistry. Alterations of iron metabolism and citrulline, an indicator of intestinal toxicity, will also be assessed.
- MeSH
- alfa-tokoferol MeSH
- citrulin analýza MeSH
- fenotyp MeSH
- imunohistochemie MeSH
- imunologické faktory MeSH
- indolamin-2,3,-dioxygenasa MeSH
- karcinom prsu in situ MeSH
- kynurenin MeSH
- lymfocyty účinky léků MeSH
- nádory prsu MeSH
- neoadjuvantní terapie MeSH
- neopterin MeSH
- poruchy metabolismu železa MeSH
- prognóza MeSH
- receptor erbB-2 MeSH
- retrospektivní studie MeSH
- triple-negativní karcinom prsu MeSH
- vitamin A MeSH
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- onkologie
- gynekologie a porodnictví
- NLK Publikační typ
- závěrečné zprávy o řešení grantu IGA MZ ČR
Despite the progress of tailored therapeutic strategies in patients with breast cancer, there is an unmet medical need for additional biomarkers that would guide therapy, including the administration of targeted agents. It has been demonstrated that the presence of tumor-infiltrating lymphocytes (TILs) is associated with prognosis in patients with early breast cancer. Moreover, TIL counts were shown to predict outcome of neoadjuvant chemotherapy. The neoadjuvant setting is increasingly used to assess the efficacy of new systemic therapies, and TILs are promising as a biomarker reflecting the immune response to tumor. Future studies should investigate on the integration of TILs as predictive biomarkers in patients treated with targeted- agents.
Trypanosomatids are unicellular parasites living in a wide range of host environments, which to large extent shaped their mitochondrial energy metabolism, resulting in quite large differences even among closely related flagellates. In a comparative manner, we analyzed the activities and composition of mitochondrial respiratory complexes in four species (Leishmania tarentolae, Crithidia fasciculata, Phytomonas serpens and Trypanosoma brucei), which represent the main model trypanosomatids. Moreover, we measured the activity of mitochondrial glycerol-3-phosphate dehydrogenase, the overall oxygen consumption and the mitochondrial membrane potential in each species. The comparative analysis suggests an inverse relationship between the activities of respiratory complexes I and II, as well as the overall activity of the canonical complexes and glycerol-3-phosphate dehydrogenase. Our comparative analysis shows that mitochondrial functions are highly variable in these versatile parasites.
- MeSH
- glycerolfosfátdehydrogenasa metabolismus MeSH
- kyslík metabolismus MeSH
- membránový potenciál mitochondrií MeSH
- mitochondrie enzymologie metabolismus MeSH
- oxidativní fosforylace * MeSH
- transport elektronů MeSH
- Trypanosomatina genetika metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- srovnávací studie MeSH
AIM: The aim of the present study was to investigate tumor-infiltrating leukocytes in patients with endometrial carcinoma. PATIENTS AND METHODS: Cluster of differentiation (CD)3(+), CD8(+) and C20(+) tumor-infiltrating lymphocytes (TILs) and CD68(+) tumor-associated macrophages (TAMs) were evaluated retrospectively by immunohistochemistry in tumor specimen from 124 patients with endometrial carcinoma. RESULTS: A significant decrease of CD3(+) TILs and an increase of CD68(+) TAM count was associated with higher tumor stage. In patients with early-stage, high-risk tumors, low intraepithelial CD3(+) TIL counts were associated with significantly inferior survival. In multivariate analysis of patients with early-stage tumors, intraepithelial CD3(+) TIL counts were an independent predictor of survival. CONCLUSION: In patients with endometrial carcinoma a decrease of intraepithelial CD3(+) TIL counts is associated with advanced stage and high risk group. Intraepithelial CD3(+) TIL counts are an independent predictor of survival in patients with early tumors.
- MeSH
- antigeny CD3 metabolismus MeSH
- leukocyty imunologie patologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- nádory endometria imunologie mortalita patologie chirurgie MeSH
- počet buněk MeSH
- prognóza MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- staging nádorů MeSH
- stupeň nádoru MeSH
- tumor infiltrující lymfocyty imunologie metabolismus MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Klíčová slova
- implantace, argus páska, silikonový polštářek, protahovací jehly,
- MeSH
- inkontinence moči * chirurgie terapie MeSH
- lidé MeSH
- suburetrální pásky využití MeSH
- urologické chirurgické výkony u mužů * metody přístrojové vybavení využití MeSH
- výsledek terapie MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
