Nejnovější poznatky v biologii chronické lymfocytární leukemie (CLL) mají významný dopad na léčbu tohoto onemocnění. Buňky CLL vykazují závislost na zvýšené expresi BCL-2, autonomní BCR signalizaci a vyznačují se nadměrnou expresí delta izoformy p110 PI3K kinázy a BTK kinázy, která podporuje přežívání nádorových buněk. Cílená léčba monoklonálními protilátkami rituximabem a obinutuzumabem spolu s malými molekulami, jako je ibrutinib, idelalisib a venetoklax, výrazně rozšířila terapeutické možnosti, což vedlo ke zlepšení celkového přežití pacientů. V této souvislosti je pozoruhodné, že pacienti, kteří zahájili léčbu ibrutinibem, vykazují míru přežití srovnatelnou s celkovou populací. Ne všechny problémy spojené s CLL však byly vyřešeny, neboť stále přetrvávají otázky týkající se dysfunkce imunitního systému a sekundárních malignit, jednotnosti léčebných přístupů pro pacienty s vysokým a nízkým rizikem, dlouhodobých strategií pro mladé pacienty a terapie pro pacienty s Richterovou transformací. Přestože inhibitory BTK a BCL-2 mohou pozitivně ovlivnit imunitní systém, problémy spojené s infekcemi a sekundárními nádory přetrvávají. Pokud jde o Richterovu transformaci, identifikace specifických genetických abnormalit může v budoucnu umožnit cílenější a účinnější léčbu, včetně terapie CAR-T a bispecifických protilátek.
New findings in the biology of chronic lymphocytic leukemia (CLL) have major implications for the treatment of this disease. CLL cells exhibit a dependence on increased expression of BCL-2, an autonomous BCR signaling pathway, and are characterized by overexpression of the p110 PI3K delta kinase isoform and BTK kinase, which promotes tumor cell survival. Targeted therapies such as the monoclonal antibodies rituximab and obinutuzumab, along with small molecules such as ibrutinib, idelalisib, and venetoclax, have dramatically expanded therapeutic options, resulting in improved overall patient survival. In this context, it is noteworthy that patients starting treatment with ibrutinib have survival rates comparable to the general population. However, not all issues have been resolved, as there are questions regarding the immune system, consistency in treatment approaches and long-term strategies for young patients, especially those with Richter transformation. Although BTK and BCL-2 inhibitors can positively influence the immune system, we still face challenges related to infections and secondary tumors. Regarding Richter transformation, identification of specific genetic abnormalities may allow more targeted and effective therapies in the future, including CAR-T therapy and bispecific antibodies.
- Klíčová slova
- Richterova transformace,
- MeSH
- antitumorózní látky aplikace a dávkování terapeutické užití MeSH
- chronická lymfatická leukemie farmakoterapie genetika patologie MeSH
- imunitní systém imunologie patologie MeSH
- lidé MeSH
- nádorový supresorový protein p53 genetika MeSH
- proteinkinasa BTK antagonisté a inhibitory MeSH
- protokoly protinádorové léčby MeSH
- protoonkogenní proteiny c-bcl-2 antagonisté a inhibitory MeSH
- Check Tag
- lidé MeSH
Proteins from the Bcl-2 family play an essential role in the regulation of apoptosis. However, they also possess cell death-unrelated activities that are less well understood. This prompted us to study apoptosis-unrelated activities of the Bax and Bak, pro-apoptotic members of the Bcl-2 family. We prepared Bax/Bak-deficient human cancer cells of different origin and found that while respiration in the glioblastoma U87 Bax/Bak-deficient cells was greatly enhanced, respiration of Bax/Bak-deficient B lymphoma HBL-2 cells was slightly suppressed. Bax/Bak-deficient U87 cells also proliferated faster in culture, formed tumours more rapidly in mice, and showed modulation of metabolism with a considerably increased NAD+/NADH ratio. Follow-up analyses documented increased/decreased expression of mitochondria-encoded subunits of respiratory complexes and stabilization/destabilization of the mitochondrial transcription elongation factor TEFM in Bax/Bak-deficient U87 and HBL-2 cells, respectively. TEFM downregulation using shRNAs attenuated mitochondrial respiration in Bax/Bak-deficient U87 as well as in parental HBL-2 cells. We propose that (post)translational regulation of TEFM levels in Bax/Bak-deficient cells modulates levels of subunits of mitochondrial respiratory complexes that, in turn, contribute to respiration and the accompanying changes in metabolism and proliferation in these cells.
- MeSH
- apoptóza * genetika MeSH
- dýchání MeSH
- lidé MeSH
- mitochondrie genetika metabolismus MeSH
- myši MeSH
- protein Bak * genetika metabolismus MeSH
- protein X asociovaný s bcl-2 genetika metabolismus MeSH
- protoonkogenní proteiny c-bcl-2 genetika metabolismus MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
The cytokine TNF can trigger highly proinflammatory RIPK1-dependent cell death. Here, we show that the two adapter proteins, TANK and AZI2, suppress TNF-induced cell death by regulating the activation of TBK1 kinase. Mice lacking either TANK or AZI2 do not show an overt phenotype. Conversely, animals deficient in both adapters are born in a sub-Mendelian ratio and suffer from severe multi-organ inflammation, excessive antibody production, male sterility, and early mortality, which can be rescued by TNFR1 deficiency and significantly improved by expressing a kinase-dead form of RIPK1. Mechanistically, TANK and AZI2 both recruit TBK1 to the TNF receptor signaling complex, but with distinct kinetics due to interaction with different complex components. While TANK binds directly to the adapter NEMO, AZI2 is recruited later via deubiquitinase A20. In summary, our data show that TANK and AZI2 cooperatively sustain TBK1 activity during different stages of TNF receptor assembly to protect against autoinflammation.
- MeSH
- adaptorové proteiny signální transdukční * metabolismus genetika MeSH
- buněčná smrt MeSH
- endopeptidasy MeSH
- intracelulární signální peptidy a proteiny metabolismus genetika MeSH
- lidé MeSH
- myši inbrední C57BL MeSH
- myši knockoutované * MeSH
- myši MeSH
- protein-serin-threoninkinasy interagující s receptory * metabolismus genetika MeSH
- protein-serin-threoninkinasy * metabolismus genetika MeSH
- receptory TNF - typ I * metabolismus genetika MeSH
- signální transdukce MeSH
- TNF-alfa * metabolismus MeSH
- TNFAIP3 metabolismus genetika MeSH
- zánět metabolismus MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
- myši MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
Caspase-12 is a molecule whose functions are still not well understood. Although its expression has been found in various tissues, specific roles have been described in only a few cases. These include the effect of caspase-12 on murine bone cell differentiation during craniofacial development. This work focused on the development of the limbs taking place through endochondral ossification, which precedes the formation of the cartilaginous growth plate. Caspase-12 was described here for the first time in growth plate chondrocytes during physiological development. Using pharmacological inhibition, caspase-12 was found to affect chondrogenesis. Limb-derived micromass cultures showed a significantly increased area of chondrogenic nodules after caspase-12 inhibition and there were changes in gene expression, the most significant of which was the reduction of Mmp9. These data point to potential new functions of caspase-12 in chondrogenesis.
- MeSH
- buněčná diferenciace MeSH
- chondrocyty * MeSH
- chondrogeneze * fyziologie MeSH
- inhibitory kaspas farmakologie MeSH
- kaspasa 12 * metabolismus genetika MeSH
- kultivované buňky MeSH
- matrixová metaloproteinasa 9 metabolismus genetika MeSH
- myši MeSH
- růstová ploténka růst a vývoj MeSH
- vývojová regulace genové exprese MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
The therapeutic potential of targeting PI3K/AKT/PTEN signalling in B-cell malignancies remains attractive. Whilst PI3K-α/δ inhibitors demonstrate clinical benefit in certain B-cell lymphomas, PI3K signalling inhibitors have been inadequate in relapsed/refractory diffuse large B-cell lymphoma (DLBCL) in part, due to treatment related toxicities. Clinically, AKT inhibitors exhibit a differentiated tolerability profile offering an alternative approach for treating patients with B-cell malignancies. To explore how AKT inhibition complements other potential therapeutics in the treatment of DLBCL patients, an in vitro combination screen was conducted across a panel of DLCBL cell lines. The AKT inhibitor, capivasertib, in combination with the BCL-2 inhibitor, venetoclax, produced notable therapeutic benefit in preclinical models of DLBCL. Capivasertib and venetoclax rapidly induced caspase and PARP cleavage in GCB-DLBCL PTEN wildtype cell lines and those harbouring PTEN mutations or reduced PTEN protein, driving prolonged tumour growth inhibition in DLBCL cell line and patient derived xenograft lymphoma models. The addition of the rituximab further deepened the durability of capivasertib and venetoclax responses in a RCHOP refractory DLBCL in vivo models. These findings provide preclinical evidence for the rational treatment combination of AKT and BCL-2 inhibitors using capivasertib and venetoclax respectively alongside anti-CD20 antibody supplementation for treatment of patients with DLBCL.
- MeSH
- apoptóza účinky léků MeSH
- bicyklické sloučeniny heterocyklické * farmakologie terapeutické užití MeSH
- difúzní velkobuněčný B-lymfom * farmakoterapie patologie MeSH
- fosfohydroláza PTEN metabolismus MeSH
- lidé MeSH
- myši SCID MeSH
- myši MeSH
- nádorové buněčné linie MeSH
- proliferace buněk účinky léků MeSH
- protokoly antitumorózní kombinované chemoterapie * farmakologie terapeutické užití MeSH
- protoonkogenní proteiny c-akt * metabolismus MeSH
- protoonkogenní proteiny c-bcl-2 * antagonisté a inhibitory metabolismus MeSH
- pyrimidiny * farmakologie terapeutické užití MeSH
- pyrroly farmakologie terapeutické užití MeSH
- rituximab farmakologie terapeutické užití MeSH
- sulfonamidy * farmakologie terapeutické užití MeSH
- xenogenní modely - testy antitumorózní aktivity * MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
The CYCS gene is highly evolutionarily conserved, with only a few pathogenic variants that cause thrombocytopenia-4 (THC4). Here, we report a novel CYCS variant NM_018947.6: c.59C>T [NP_061820.1:p.(Thr20Ile)] segregating with thrombocytopenia in three generations of a Czech family. The phenotype of the patients corresponds to THC4 with platelets of normal size and morphology and dominant inheritance. Intriguingly, a gradual decline in platelet counts was observed across generations. CRISPR/Cas9-mediated gene editing was used to introduce the new CYCS gene variant into a megakaryoblast cell line (MEG-01). Subsequently, the adhesion, shape, size, ploidy, viability, mitochondrial respiration, cytochrome c protein (CYCS) expression, cell surface antigen expression and caspase activity were analysed in cells carrying the studied variant. Interestingly, the variant decreases the expression of CYCS while increasing mitochondrial respiration and the expression of CD9 cell surface antigen. Surprisingly, the variant abates caspase activation, contrasting with previously known effects of other CYCS variants. Some reports indicate that caspases may be involved in thrombopoiesis; thus, the observed dysregulation of caspase activity might contribute to thrombocytopenia. The findings significantly enhance our understanding of the molecular mechanisms underlying inherited thrombocytopenia and may have implications for diagnosis, prognosis and future targeted therapies.
- MeSH
- kaspasy * metabolismus genetika MeSH
- lidé MeSH
- rodokmen MeSH
- trombocytopenie * genetika metabolismus MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
MicroRNA hsa-miR-29 was connected to a number of malignancies. Its target genes are many, among them Mcl-1 that is expressed in three possible isoforms, one of which is anti-apoptotic and another one pro-apoptotic. Ratio of these two isoforms appears to affect cell response to external stimuli. We have demonstrated that miR-29b enhanced etoposide toxicity in HeLa cell line by modulating this ratio of Mcl-1 isoforms. However, it is not known whether the described miR-29 effect is common to various cancer types or even have the opposite effect. This represents a significant problem for possible future applications. In this report, we demonstrate that miR-29b affects toxicity of 60 μM etoposide in cell lines derived from selected malignancies. The mechanism, however, differs among the cell lines tested. Hep G2 cells demonstrated similar effect of miR-29b on etoposide toxicity as was described in HeLa cells, i.e. modulation of Mcl-1 expression. Target protein down-regulated by miR-29b resulting in enhanced etoposide toxicity in Caco-2 cells was, however, Bcl-2 protein. Moreover, H9c2, Hek-293 and ARPE-19 cell lines selected as a representatives of non-malignant cells, showed no effect of miR-29b on etoposide toxicity. Our data suggest that miR-29b could be a common enhancer of etoposide toxicity in malignant cells due to its modulation of Bcl family proteins.
- MeSH
- antitumorózní látky fytogenní farmakologie toxicita MeSH
- apoptóza účinky léků genetika MeSH
- buňky Hep G2 MeSH
- Caco-2 buňky MeSH
- etoposid * toxicita farmakologie MeSH
- HEK293 buňky MeSH
- HeLa buňky MeSH
- lidé MeSH
- mikro RNA * genetika metabolismus MeSH
- protein MCL-1 * genetika metabolismus MeSH
- protoonkogenní proteiny c-bcl-2 genetika metabolismus MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
Venetoclax (VEN), a B-cell lymphoma 2 (BCL2) inhibitor, has a promising single-agent activity in mantle cell lymphoma (MCL), acute lymphoblastic leukemia (ALL), and large BCLs, but remissions were generally short, which call for rational drug combinations. Using a panel of 21 lymphoma and leukemia cell lines and 28 primary samples, we demonstrated strong synergy between VEN and A1155463, a BCL-XL inhibitor. Immunoprecipitation experiments and studies on clones with knockout of expression or transgenic expression of BCL-XL confirmed its key role in mediating inherent and acquired VEN resistance. Of note, the VEN and A1155463 combination was synthetically lethal even in the cell lines with lack of expression of the proapoptotic BCL2L11/BIM and in the derived clones with genetic knockout of BCL2L11/BIM. This is clinically important because BCL2L11/BIM deletion, downregulation, or sequestration results in VEN resistance. Immunoprecipitation experiments further suggested that the proapoptotic effector BAX belongs to principal mediators of the VEN and A1155463 mode of action in the BIM-deficient cells. Lastly, the efficacy of the new proapoptotic combination was confirmed in vivo on a panel of 9 patient-derived lymphoma xenografts models including MCL (n = 3), B-ALL (n = 2), T-ALL (n = 1), and diffuse large BCL (n = 3). Because continuous inhibition of BCL-XL causes thrombocytopenia, we proposed and tested an interrupted 4 days on/3 days off treatment regimen, which retained the desired antitumor synergy with manageable platelet toxicity. The proposed VEN and A1155463 combination represents an innovative chemotherapy-free regimen with significant preclinical activity across diverse BCL2+ hematologic malignancies irrespective of the BCL2L11/BIM status.
- MeSH
- antitumorózní látky farmakologie terapeutické užití MeSH
- apoptóza účinky léků MeSH
- benzothiazoly MeSH
- bicyklické sloučeniny heterocyklické * farmakologie terapeutické užití MeSH
- chemorezistence * MeSH
- isochinoliny MeSH
- lidé MeSH
- myši MeSH
- nádorové buněčné linie MeSH
- protein bcl-X * metabolismus antagonisté a inhibitory MeSH
- protein BCL2L11 * metabolismus genetika MeSH
- protoonkogenní proteiny c-bcl-2 metabolismus antagonisté a inhibitory MeSH
- sulfonamidy * farmakologie terapeutické užití MeSH
- synergismus léků MeSH
- xenogenní modely - testy antitumorózní aktivity MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
The aim of this study was to describe the clinical and molecular genetic findings in seven individuals from three unrelated families with Blau syndrome. A complex ophthalmic and general health examination including diagnostic imaging was performed. The NOD2 mutational hot spot located in exon 4 was Sanger sequenced in all three probands. Two individuals also underwent autoinflammatory disorder gene panel screening, and in one subject, exome sequencing was performed. Blau syndrome presenting as uveitis, skin rush or arthritis was diagnosed in four cases from three families. In two individuals from one family, only camptodactyly was noted, while another member had camptodactyly in combination with non-active uveitis and angioid streaks. One proband developed two attacks of meningoencephalitis attributed to presumed neurosarcoidosis, which is a rare finding in Blau syndrome. The probands from families 1 and 2 carried pathogenic variants in NOD2 (NM_022162.3): c.1001G>A p.(Arg334Gln) and c.1000C>T p.(Arg334Trp), respectively. In family 3, two variants of unknown significance in a heterozygous state were found: c.1412G>T p.(Arg471Leu) in NOD2 and c.928C>T p.(Arg310*) in NLRC4 (NM_001199139.1). In conclusion, Blau syndrome is a phenotypically highly variable, and there is a need to raise awareness about all clinical manifestations, including neurosarcoidosis. Variants of unknown significance pose a significant challenge regarding their contribution to etiopathogenesis of autoinflammatory diseases.
- MeSH
- artritida * genetika diagnóza MeSH
- dědičné zánětlivé autoimunitní nemoci MeSH
- lidé MeSH
- lymfedém genetika diagnóza MeSH
- mutace * MeSH
- nemoci centrálního nervového systému MeSH
- neuropatická artropatie genetika diagnóza MeSH
- rodokmen * MeSH
- sarkoidóza * genetika diagnóza MeSH
- sekvenování exomu MeSH
- signální adaptorový protein Nod2 * genetika MeSH
- synovitida * genetika diagnóza MeSH
- uveitida * genetika diagnóza MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
Chlamydia psittaci pneumonia (CPP) is a lung disease caused by the infection with the Chla-mydia psittaci bacterium, which can lead to severe acute respiratory distress syndrome and systemic symptoms. This study explored the specific mechanisms underlying the impact of reactive oxygen species (ROS) on the Th17/Treg balance in CPP. The levels of ROS and the differentiation ratio of Th17/Treg in the peripheral blood of healthy individuals and CPP patients were measured using ELISA and flow cytometry, respectively. The association between the ROS levels and Th17/Treg was assessed using Pearson correlation analysis. The ROS levels and the Th17/Treg ratio were measured in CD4+ T cells following H2O2 treatment and NLRP3 inhibition. The effects of H2O2 treatment and NLRP3 inhibition on the NLRP3/IL-1β/caspase-1 pathway were observed using immunoblotting. Compared to the healthy group, the CPP group exhibited increased levels of ROS in the peripheral blood, an elevated ratio of Th17 differentiation, and a decreased ratio of Treg differentiation. ROS levels were positively correlated with the Th17 cell proportion but negatively correlated with the Treg cell proportion. The ROS levels and NLRP3/IL-1β/caspase-1 expression were up-regulated in CD4+ T cells after H2O2 treatment. Furthermore, there was an increase in Th17 differentiation and a decrease in Treg differentiation. Conversely, the NLRP3/IL-1β/caspase-1 pathway inhibition reversed the effects of H2O2 treatment, with no significant change in the ROS levels. ROS regulates the Th17/Treg balance in CPP, possibly through the NLRP3/IL-1β/caspase-1 pathway. This study provides a new perspective on the development of immunotherapy for CPP.
- MeSH
- buněčná diferenciace * účinky léků MeSH
- buňky Th17 * imunologie metabolismus MeSH
- Chlamydophila psittaci * MeSH
- dospělí MeSH
- interleukin-1beta * metabolismus MeSH
- kaspasa 1 * metabolismus MeSH
- lidé středního věku MeSH
- lidé MeSH
- peroxid vodíku metabolismus MeSH
- protein NLRP3 * metabolismus MeSH
- psitakóza MeSH
- reaktivní formy kyslíku * metabolismus MeSH
- regulační T-lymfocyty * imunologie MeSH
- signální transdukce MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
