Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 47
Filtrar
1.
iScience ; 27(4): 109528, 2024 Apr 19.
Artigo em Inglês | MEDLINE | ID: mdl-38595797

RESUMO

Diabetic neuropathy (DN) is a major complication of diabetes mellitus. Chondroitin sulfate (CS) is one of the most important extracellular matrix components and is known to interact with various diffusible factors; however, its role in DN pathology has not been examined. Therefore, we generated CSGalNAc-T1 knockout (T1KO) mice, in which CS levels were reduced. We demonstrated that diabetic T1KO mice were much more resistant to DN than diabetic wild-type (WT) mice. We also found that interactions between pericytes and vascular endothelial cells were more stable in T1KO mice. Among the RNA-seq results, we focused on the transforming growth factor ß signaling pathway and found that the phosphorylation of Smad2/3 was less upregulated in T1KO mice than in WT mice under hyperglycemic conditions. Taken together, a reduction in CS level attenuates DN progression, indicating that CS is an important factor in DN pathogenesis.

2.
Int J Hematol ; 119(4): 399-406, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38427208

RESUMO

INTRODUCTION: The peptide-based cancer vaccine targeting Wilms' tumor 1 (WT1) is a promising immunotherapeutic strategy for hematological malignancies. It remains unclear how long and to what extent the WT1-specific CD8 + cytotoxic T cell (CTL) persist after WT1 peptide vaccination. METHODS: The WT1 peptide vaccine was administered with written consent to a patient with CML in the chronic phase who did not respond well to imatinib, and the patient was followed for 12 years after vaccination. Immune monitoring was performed by specific amplification of WT1-specific CTLs using a mixed lymphocyte peptide culture. T-cell receptors (TCRs) of amplified WT1-specific CTLs were analyzed using next-generation sequencing. This study was approved by the Institutional Review Board of our institution. RESULT: WT1-specific CTLs, which were initially detected during WT1 peptide vaccination, persisted at a frequency of less than 5 cells per 1,000,000 CD8 + T cells for more than 10 years. TCR repertoire analysis confirmed the diversity of WT1-specific CTLs 11 years after vaccination. CTLs exhibited WT1 peptide-specific cytotoxicity in vitro. CONCLUSION: The WT1 peptide vaccine induced an immune response that persists for more than 10 years, even after cessation of vaccination in the CML patient.


Assuntos
Vacinas Anticâncer , Linfócitos T Citotóxicos , Humanos , Vacinas Anticâncer/uso terapêutico , Proteínas WT1 , Vacinas de Subunidades Antigênicas , Peptídeos , Receptores de Antígenos de Linfócitos T , Vacinação
3.
Fish Shellfish Immunol ; 143: 109133, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37923185

RESUMO

Edwardsiella tarda (E. tarda), an intracellular pathogen, has caused severe economic losses in aquaculture. Effective vaccine development for E. tarda prevention is urgently needed. A previous study indicates that cell-mediated immunity (CMI) might play an important role in E. tarda infection. We believe that the involvement of allograft rejection and CMI has now been well documented in mammals and some fishes. However, there is still little research on the application of blood allograft rejection in vaccine development. In the current study, we investigate the immune response and vaccine effect in fish vaccinated with allogeneic blood + formalin-killed cells vaccine (FKC), allogeneic blood + phosphate-buffered saline (PBS), PBS + FKC and PBS + PBS. In the challenge test, the relative percentage survival (RPS) of the allogeneic + FKC, the allogeneic blood + PBS and the PBS + FKC group was 61.46, 35.41, and 30.63 % respectively. The up-regulated expression of Th1-related genes IFN-γ 1, IFN-γ 1rel2, IL-12p35 and T-bet suggests the protection is via CMI induction. Only in the allogeneic + FKC group, gene expression of IFN-γ 1, IL-12p35 and T-bet is significantly higher, indicating synergy between the two substances. Furthermore, among the fish injected with the allogeneic blood cells, syngeneic blood cells and PBS group, only in the fish of the allogenic blood cells injection group, did expression of IFN-γ 1, IFN-γ 2 and IFN-γ rel2 gene expression significantly increased. The results indicate that the rejection was induced by allogeneic components. Thus, our findings might provide essential information and insights into vaccine development in aquaculture.


Assuntos
Carpas , Infecções por Enterobacteriaceae , Doenças dos Peixes , Transplante de Células-Tronco Hematopoéticas , Animais , Carpa Dourada , Subunidade p35 da Interleucina-12 , Adjuvantes Imunológicos , Vacinas de Produtos Inativados , Doenças dos Peixes/prevenção & controle , Vacinas Bacterianas , Edwardsiella tarda , Mamíferos
4.
Sci Rep ; 13(1): 13098, 2023 08 11.
Artigo em Inglês | MEDLINE | ID: mdl-37567982

RESUMO

Donor T cell activation, proliferation, differentiation, and migration are the major steps involved in graft-versus-host disease (GVHD) development following bone marrow transplantation. Chondroitin sulfate (CS) proteoglycan is a major component of the extracellular matrix and causes immune modulation by interacting with cell growth factors and inducing cell adhesion. However, its precise effects on immune function are unclear than those of other proteoglycan families. Thus, we investigated the significance of CS within donor cells in acute GVHD development utilizing CSGalNAc T1-knockout (T1KO) mice. To determine the effects of T1KO, the mice underwent allogenic bone marrow transplantation from major histocompatibility complex-mismatched donors. While transplantation resulted in hepatic GVHD with inflammatory cell infiltration of both CD4+ and CD8+ effector memory T cells, transplantation in T1KO-donors showed milder cell infiltration and improved survival with fewer splenic effector T cells. In vitro T-cell analyses showed that the ratio of effector memory T cells was significantly lower via phorbol myristate acetate/ionomycin stimulation. Moreover, quantitative PCR analyses showed significantly less production of inflammatory cytokines, such as IFN-γ and CCL-2, in splenocytes of T1KO mice. These results suggest that reduction of CS in donor blood cells may suppress the severity of acute GVHD after hematopoietic stem cell transplantation.


Assuntos
Doença Enxerto-Hospedeiro , Transplante de Células-Tronco Hematopoéticas , Camundongos , Animais , Sulfatos de Condroitina , Transplante Homólogo/efeitos adversos , Transplante de Medula Óssea/efeitos adversos , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Doença Enxerto-Hospedeiro/etiologia , Camundongos Endogâmicos C57BL
5.
Dev Comp Immunol ; 133: 104420, 2022 08.
Artigo em Inglês | MEDLINE | ID: mdl-35417735

RESUMO

Unlike most mammalian cell lines, fish cell lines are immortal and resistant to cellular senescence. Elevated expression of H-Ras contributes to the induction of senescence in a fish cell line, EPC, but is not sufficient to induce full senescence. Here, we focused on the absence of a p16INK4a/ARF locus in the fish genome, and investigated whether this might be a critical determinant of the resistance of EPC cells to full senescence. We found that transfected EPC cells constitutively overexpressing p16INK4a exhibited large size and flat morphology characteristic of prematurely senescent cells; the cells also showed p53-independent senescence-like growth arrest and senescence-associated ß-galactosidase (SA-ß-gal) activity. Furthermore, the mRNA levels of proinflammatory senescence-associated secretory phenotype (SASP) factors increased in EPC cells constitutively overexpressing p16INK4a. These results suggest that the lack of p16INK4a in the fish genome may be a critical determinant of senescence resistance in fish cell lines.


Assuntos
Senescência Celular , Inibidor p16 de Quinase Dependente de Ciclina , Animais , Linhagem Celular , Senescência Celular/genética , Inibidor p16 de Quinase Dependente de Ciclina/genética , Inibidor p16 de Quinase Dependente de Ciclina/metabolismo , Peixes/genética , Peixes/metabolismo , Mamíferos
6.
Support Care Cancer ; 30(1): 475-485, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-34313857

RESUMO

PURPOSE: Bloodstream infection (BSI) is a major complication of allogeneic hematopoietic stem-cell transplantation (allo-SCT). There are several causes of BSI; in particular, severe oral mucositis (OM) can induce BSI due to coagulase-negative staphylococci (CoNS). The OM severity may be reduced with intensive oral care. Thus, we evaluated whether the type of oral care affects the BSI incidence eventually. METHOD: We performed retrospective analysis on 206 recipients who underwent allo-SCT from 2006 to 2017 at our institute. Intensive oral care by a dental specialist was performed for 111 recipients (intensive-care group) and self-oral care was performed by 95 recipients (self-care group). Incidence of BSI was assessed by type of the oral care, before neutrophil engraftment (pre-E-BSI) and after neutrophil engraftment (post-E-BSI) period until 180 days after allo-SCT. RESULT: A total of 112 BSI occurred in 90 of the 206 recipients and 120 bacteria were identified, with CoNS being the most prevalent. There was no significant difference in the incidence of pre-E-BSI between the self-care and intensive-care groups (30.8% and 30.6%, respectively; P = 0.508). Meanwhile, the incidence of post-E-BSI was significantly lower in the intensive-care group than in the self-care group (14.3% and 28.6%; P = 0.008). In addition, the intensive-care group had significantly lower incidence of post-E-BSI with CoNS than the self-care group (8.5% and 21.5%, respectively; P = 0.009). CONCLUSION: Intensive oral care through the period of allo-HCT can significantly reduce the post-E-BSI occurrence, especially due to CoNS.


Assuntos
Bacteriemia , Transplante de Células-Tronco Hematopoéticas , Sepse , Bacteriemia/epidemiologia , Bacteriemia/etiologia , Bacteriemia/prevenção & controle , Coagulase , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Humanos , Neutrófilos , Estudos Retrospectivos , Fatores de Risco , Transplante Homólogo
7.
Vaccines (Basel) ; 9(11)2021 Oct 29.
Artigo em Inglês | MEDLINE | ID: mdl-34835184

RESUMO

Immersion vaccination with a biomimetic mucoadhesive nanovaccine has been shown to induce a strong mucosal immune response against columnaris disease, a serious bacterial disease in farmed red tilapia caused by Flavobacterium columnare. However, the induction of a systemic immune response by the vaccine is yet to be investigated. Here, we examine if a specific humoral immune response is stimulated in tilapia by a biomimetic-mucoadhesive nanovaccine against Flavobacterium columnare using an indirect-enzyme-linked immunosorbent assay (ELISA), serum bactericidal activity (SBA) and the expression of immune-related genes within the head-kidney and spleen, together with assessing the relative percent survival of vaccinated fish after experimentally infecting them with F. columnare. The anti-IgM antibody titer of fish at 14 and 21 days post-vaccination was significantly higher in chitosan complex nanoemulsion (CS-NE) vaccinated fish compared to fish vaccinated with the formalin-killed vaccine or control fish, supporting the serum bactericidal activity results at these time points. The cumulative mortality of the unvaccinated control fish was 87% after challenging fish with the pathogen, while the cumulative mortality of the CS-NE vaccinated group was 24%, which was significantly lower than the formalin-killed vaccinated and control fish. There was a significant upregulation of IgM, IgT, TNF α, and IL1-ß genes in the spleen and kidney of vaccinated fish. Significant upregulation of IgM and IgT genes was observed in the spleen of CS-NE vaccinated fish. The study confirmed the charged-chitosan-based mucoadhesive nanovaccine to be an effective platform for immersion vaccination of tilapia, with fish generating a humoral systemic immune response against columnaris disease in vaccinated fish.

8.
iScience ; 24(10): 103117, 2021 Oct 22.
Artigo em Inglês | MEDLINE | ID: mdl-34611611

RESUMO

The suppressors of cytokine signaling (SOCS) proteins are negative regulators of cytokine signaling required to prevent excessive cellular responses. In particular, SOCS3 is involved in the regulation of metabolic syndromes, such as obesity and diabetes, by suppressing leptin and insulin signals. SOCS3 also suppresses the inflammatory response associated with metabolic stress, but this specific role remains undefined. Wild-type mice on a high-fat diet (HFD) exhibited only fatty liver, whereas systemic deletion of SOCS3 resulted in excessive myeloid hematopoiesis and hepatic inflammation. In addition, depletion of the gut microbiota resulted in considerable improvement in excess granulopoiesis and splenomegaly, halting the progression of systemic inflammation in SOCS3KO mice on the HFD. This result suggests that intestinal dysbiosis is involved in inflammation associated with SOCS3KO. Although contributing to diet-induced obesity and fatty liver, SOCS3 is nevertheless critical to suppress excess myeloid hematopoiesis and severe systemic inflammation associated with intestinal dysbiosis on HFD.

10.
Fish Shellfish Immunol ; 112: 81-91, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33675991

RESUMO

Columnaris, a highly contagious bacterial disease caused by Flavobacterium columnare, is recognized as one of the most important infectious diseases in farmed tilapia, especially during the fry and fingerling stages of production. The disease is associated with characteristic lesions in the mucosa of affected fish, particularly their skin and gills. Vaccines delivered via the mucosa are therefore of great interest to scientists developing vaccines for this disease. In the present study, we characterized field isolates of F. columnare obtained from clinical columnaris outbreaks in red tilapia to select an isolate to use as a candidate for our vaccine study. This included characterizing its colony morphology, genotype and virulence status. The isolate was incorporated into a mucoadhesive polymer chitosan-complexed nanovaccine (CS-NE), the efficacy of which was determined by experimentally infecting red tilapia that had been vaccinated with the nanoparticles by immersion. The experimental infection was performed 30-days post-vaccination (dpv), which resulted in 89% of the unvaccinated control fish dying, while the relative percentage survival (RPS) of the CS-NE vaccinated group was 78%. Histology of the mucosal associated lymphoid tissue (MALT) showed a significantly higher presence of leucocytes and a greater antigen uptake by the mucosal epithelium in CS-NE vaccinated fish compared to control fish and whole cell vaccinated fish, respectively, and there was statistically significant up-regulation of IgT, IgM, TNF α, IL1-ß and MHC-1 genes in the gill of the CS-NE vaccinated group. Overall, the results of our study confirmed that the CS-NE particles achieved better adsorption onto the mucosal surfaces of the fish, elicited great vaccine efficacy and modulated the MALT immune response better than the conventional whole cell-killed vaccine, demonstrating the feasibility of the mucoadhesive nano-immersion vaccine as an effective delivery system for the induction of a mucosal immune response against columnaris disease in tilapia.


Assuntos
Vacinas Bacterianas/farmacologia , Materiais Biomiméticos/farmacologia , Ciclídeos/imunologia , Doenças dos Peixes/imunologia , Imunidade nas Mucosas , Tecido Linfoide/imunologia , Nanopartículas/administração & dosagem , Animais , Vacinas Bacterianas/administração & dosagem , Materiais Biomiméticos/administração & dosagem , Doenças dos Peixes/microbiologia , Infecções por Flavobacteriaceae/imunologia , Infecções por Flavobacteriaceae/microbiologia , Infecções por Flavobacteriaceae/veterinária , Flavobacterium/fisiologia , Tecido Linfoide/efeitos dos fármacos , Vacinação/veterinária
11.
Exp Hematol ; 96: 52-62.e5, 2021 04.
Artigo em Inglês | MEDLINE | ID: mdl-33582241

RESUMO

The bone marrow (BM) microenvironment, known as the BM niche, regulates hematopoiesis but is also affected by interactions with hematopoietic cells. Recent evidence indicates that extracellular matrix components are involved in these interactions. Chondroitin sulfate (CS), a glycosaminoglycan, is a major component of the extracellular matrix; however, it is not known whether CS has a physiological role in hematopoiesis. Here, we analyzed the functions of CS in hematopoietic and niche cells. CSGalNAcT1, which encodes CS N-acetylgalactosaminyltransferase-1 (T1), a key enzyme in CS biosynthesis, was highly expressed in hematopoietic stem and progenitor cells (HSPCs) and endothelial cells (ECs), but not in mesenchymal stromal cells (MSCs) in BM. In T1 knockout (T1KO) mice, a greater number of HSPCs existed compared with the wild-type (WT), but HSPCs from T1KO mice showed significantly impaired repopulation in WT recipient mice on serial transplantation. RNA sequence analysis revealed the activation of IFN-α/ß signaling and endoplasmic reticulum stress in T1KO HSPCs. In contrast, the number of WT HSPCs repopulated in T1KO recipient mice was larger than that in WT recipient mice after serial transplantation, indicating that the T1KO niche supports repopulation of HSPCs better than the WT niche. There was no obvious difference in the distribution of vasculature and MSCs between WT and T1KO BM, suggesting that CS loss alters vascular niche functions without affecting its structure. Our results revealed distinct roles of CS in hematopoietic cells and BM niche, indicating that crosstalk between these components is important to maintain homeostasis in BM.


Assuntos
Sulfatos de Condroitina/metabolismo , Hematopoese , Células-Tronco Hematopoéticas/citologia , Animais , Células da Medula Óssea/citologia , Transplante de Medula Óssea , Células-Tronco Hematopoéticas/metabolismo , Camundongos Endogâmicos C57BL , Nicho de Células-Tronco
12.
Int J Hematol ; 113(5): 723-734, 2021 May.
Artigo em Inglês | MEDLINE | ID: mdl-33502734

RESUMO

Wilms' tumor 1 (WT1) is a tumor-associated antigen and immunotherapy target in myelodysplastic syndrome (MDS). Further information is needed on the characteristics of WT1-specific CD8 + T cells to develop immunotherapeutic strategies for MDS. To clarify the frequency, distribution, and phenotype of WT1-specific CD8 + T cells, which occur innately in MDS patients, we analyzed paired peripheral blood (PB) and bone marrow (BM) samples from 39 patients with MDS or acute myeloid leukemia with myelodysplasia-related changes. The median frequency of WT1 tetramer-binding CD8 + T cells in the CD8 + T cell population was 0.11% in PB and 0.18% in BM. A further tetramer assay combined with mixed lymphocyte peptide culture (MLPC assay) was used to detect functional WT1-specific CD8 + T cells that could respond to the WT1 peptide. Functional WT1-specific CD8 + T cells were detected in BM in 61% of patients, which was significantly higher than in PB (23%, p = 0.001). The frequency of these cells estimated by the MLPC assay was tenfold higher in BM than in PB. The majority of WT1 tetramer-binding CD8 + T cells in BM had a unique phenotype with co-expression of CD39 and CXCR4. These findings will facilitate the development of novel immunotherapeutic strategies for MDS.


Assuntos
Medula Óssea/imunologia , Antígenos CD8/análise , Síndromes Mielodisplásicas/imunologia , Linfócitos T Citotóxicos/imunologia , Proteínas WT1/análise , Adulto , Idoso , Idoso de 80 Anos ou mais , Antígenos CD8/imunologia , Humanos , Pessoa de Meia-Idade , Proteínas WT1/imunologia
13.
Gene ; 765: 145116, 2021 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-32896589

RESUMO

In contrast to most mammals including human, fish cell lines have long been known to be immortal, with little sign of cellular senescence, despite the absence of transformation. Recently, our laboratory reported that DNA demethylation with 5-aza-2'-deoxycytidine (5-Aza-dC) induces telomere-independent cellular senescence and senescence-associated secretory phenotype (SASP) in an immortal fish cell line, EPC (Epithelioma papulosum cyprini). However, it is not known how fish derived cultured cells are usually resistant to aging in vitro. In this study, we focused on Ras, which carries out the main role of Ras-induced senescence (RIS), and investigated the role of Ras in the regulation of senescence in EPC cells. Our results show that 5-Aza-dC induced the expression of the ras (hras, kras, nras) gene in EPC cells. EPC cells overexpressing HRas or its constitutively active form (HRasV12) showed p53-dependent senescence-like growth arrest and senescence-associated ß-galactosidase (SA-ß-gal) activity with a large and/or flat morphology characteristic of cell senescence. On the other hand, the SASP was not induced. These results imply that the increased expression of HRas contributes to early senescence in EPC cells, but it alone may not be sufficient for the full senescence, even if HRas is aberrantly activated. Thus, the limited mechanism of RIS may play a role in the senescence-resistance of fish cell lines.


Assuntos
Senescência Celular/genética , Genes ras/genética , Genes ras/fisiologia , Envelhecimento/genética , Envelhecimento/metabolismo , Animais , Linhagem Celular , Células Cultivadas , Senescência Celular/fisiologia , Peixes/genética , Humanos , Proteínas Proto-Oncogênicas p21(ras)/genética
15.
Cancer Med ; 8(11): 5058-5067, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31305031

RESUMO

Although allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a curative therapy for high-risk acute leukemia (AL), some patients still relapse. Since patients simultaneously have many prognostic factors, difficulties are associated with the construction of a patient-based prediction algorithm of relapse. The alternating decision tree (ADTree) is a successful classification method that combines decision trees with the predictive accuracy of boosting. It is a component of machine learning (ML) and has the capacity to simultaneously analyze multiple factors. Using ADTree, we attempted to construct a prediction model of leukemia relapse within 1 year of transplantation. With the model of training data (n = 148), prediction accuracy, the AUC of ROC, and the κ-statistic value were 78.4%, 0.746, and 0.508, respectively. The false positive rate (FPR) of the relapse prediction was as low as 0.134. In an evaluation of the model with validation data (n = 69), prediction accuracy, AUC, and FPR of the relapse prediction were similar at 71.0%, 0.667, and 0.216, respectively. These results suggest that the model is generalized and highly accurate. Furthermore, the output of ADTree may visualize the branch point of treatment. For example, the selection of donor types resulted in different relapse predictions. Therefore, clinicians may change treatment options by referring to the model, thereby improving outcomes. The present results indicate that ML, such as ADTree, will contribute to the decision-making process in the diversified allo-HSCT field and be useful for preventing the relapse of leukemia.


Assuntos
Algoritmos , Tomada de Decisão Clínica/métodos , Transplante de Células-Tronco Hematopoéticas , Leucemia Mieloide Aguda/diagnóstico , Leucemia Mieloide Aguda/terapia , Aprendizado de Máquina , Participação do Paciente , Adulto , Árvores de Decisões , Gerenciamento Clínico , Feminino , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Transplante de Células-Tronco Hematopoéticas/métodos , Humanos , Leucemia Mieloide Aguda/mortalidade , Masculino , Pessoa de Meia-Idade , Modelos Teóricos , Prognóstico , Análise de Sobrevida , Transplante Homólogo , Resultado do Tratamento , Adulto Jovem
16.
Transfusion ; 59(8): 2519-2522, 2019 08.
Artigo em Inglês | MEDLINE | ID: mdl-30990901

RESUMO

BACKGROUND: The Rh complex contributes to cell membrane structural integrity of erythrocytes. Rhnull syndrome is characterized by the absence of the Rh antigen on the erythrocyte membrane, resulting in chronic hemolytic anemia. We recently came across 3 Rhnull phenotype probands within two families with the same novel RHAG mutation in the Japanese population. MATERIALS AND METHODS: Detailed Rh phenotyping by hemagglutination was performed using monoclonal and polyclonal anti-D, -C, -c, -E, and -e; monoclonal and polyclonal anti-Rh17 antibodies; and polyclonal anti-Rh29 antibodies. RHAG mRNA transcripts were analyzed by reverse transcription-polymerase chain reaction, and the mutation was verified by genomic sequencing. RESULTS: The genomic region spanning exon 6 contained a G > A transition in the invariant GT motif of the 5' donor splice-site of Intron 6 (c.945+1G>A). The Rhnull phenotype was caused by an autosomal recessive mutation in Probands 1 and 2, determined by family history. Regarding clinical features, the degree of hemolysis varied slightly between these individuals, with Proband 3 displaying acute hemolytic anemia with an infection. While no standard therapy has been established, the condition of the patient in this study improved with conservative treatment, including hydration and antibiotics. CONCLUSION: The mechanisms of hemolysis due to the Rhnull phenotype can vary, but our findings indicate that acute hemolytic crisis caused by the Rhnull syndrome could be associated with infection.


Assuntos
Proteínas Sanguíneas/genética , Glicoproteínas de Membrana/genética , Mutação , Povo Asiático , Tipagem e Reações Cruzadas Sanguíneas , Análise Mutacional de DNA , Hemólise/genética , Humanos , Japão , Masculino , Glicoproteínas de Membrana/sangue , Pessoa de Meia-Idade
17.
Gene ; 697: 194-200, 2019 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-30802536

RESUMO

Fish cell lines are known to be immortal and do not show the signs of cellular senescence despite the absence of transformation. Furthermore, high telomerase activities responsible for maintenance of telomere length are detected in many organs in live fish, irrespective of fish age. On the other hand, although it is reported that cytosine methylation at CpG island shores decreases as zebrafish age, the relationship between DNA methylation and cellular senescence in fish has not been explored. In this study, we investigated the induction of cellular senescence and senescence-associated secretory phenotype (SASP) in a fathead minnow Pimephales promelas immortal cell line, Epithelioma papulosum cyprini (EPC) treated with the DNA demethylating agent 5-Aza-2'-deoxycytidine (5-Aza-dC). DNA demethylation by 10 µM of 5-Aza-dC caused cell growth arrest, morphological senescence-like phenotypes and induction of senescence-associated ß-galactosidase (SA-ß-gal) activity, likely due to a mitotic catastrophe caused by disruption of chromosome segregation. Furthermore, RT-qPCR analyses revealed significant up-regulation of senescence markers such as p53-p21 and p16-Rb pathways as well as several SASP factors in 5-Aza-dC treated cells. Meanwhile, although DNA demethylation suppressed the transcription of myc and its downstream target, telomerase reverse transcriptase (tert), telomerase activity was no more than modestly decreased. These results suggest that although DNA methylation may be involved in the suppression of cellular senescence, it not critical for the immortalization of the fish cell line.


Assuntos
Senescência Celular/genética , Cyprinidae/genética , Envelhecimento/genética , Animais , Antimetabólitos Antineoplásicos , Linhagem Celular Tumoral , Ilhas de CpG/genética , Desmetilação do DNA , Metilação de DNA/genética , Decitabina/farmacologia , Neoplasias Epiteliais e Glandulares , Telomerase/fisiologia , Telômero/genética , beta-Galactosidase
18.
J Clin Exp Hematop ; 58(4): 161-165, 2018 Dec 13.
Artigo em Inglês | MEDLINE | ID: mdl-30305475

RESUMO

Erdheim-Chester disease (ECD), a rare form of non-Langerhans cell histiocytosis, is characterized by the infiltration of foamy CD68+ and CD1a- histiocytes into multiple organ systems. Central nervous system (CNS) involvement has recently been reported to be a poor prognostic factor when treating ECD with interferon alpha. We report the case of a 66-year-old Japanese patient with ECD involving the CNS who harbored the BRAF V600E mutation and also concomitantly developed polycythemia vera with the JAK2 V617F mutation. We confirmed 2-chlorodeoxyadenosine (cladribine) therapy to be effective for the patient in this case.


Assuntos
Doenças do Sistema Nervoso Central , Cladribina/administração & dosagem , Doença de Erdheim-Chester , Janus Quinase 2 , Mutação de Sentido Incorreto , Policitemia Vera , Proteínas Proto-Oncogênicas B-raf , Idoso , Substituição de Aminoácidos , Doenças do Sistema Nervoso Central/diagnóstico por imagem , Doenças do Sistema Nervoso Central/tratamento farmacológico , Doenças do Sistema Nervoso Central/enzimologia , Doenças do Sistema Nervoso Central/genética , Doença de Erdheim-Chester/diagnóstico por imagem , Doença de Erdheim-Chester/tratamento farmacológico , Doença de Erdheim-Chester/enzimologia , Doença de Erdheim-Chester/genética , Humanos , Janus Quinase 2/genética , Janus Quinase 2/metabolismo , Masculino , Policitemia Vera/diagnóstico por imagem , Policitemia Vera/tratamento farmacológico , Policitemia Vera/enzimologia , Policitemia Vera/genética , Proteínas Proto-Oncogênicas B-raf/genética , Proteínas Proto-Oncogênicas B-raf/metabolismo
19.
Int J Hematol ; 108(3): 282-289, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29744806

RESUMO

The Hematopoietic Cell Transplantation-specific Comorbidity Index (HCT-CI) is a widely used tool for pre-transplant risk assessment. Allogeneic hematopoietic cell transplantation (HCT) is performed on patients with diverse backgrounds, highlighting the need for other predictors to complement the HCT-CI and support bedside decision-making. There is a strong body of evidence supporting the use of pre-transplant serum ferritin (SF) in risk assessments of allogeneic HCT. We additionally found that the Glasgow Prognostic Score (GPS), which assesses inflammatory biomarkers and predicts survival of patients with solid organ malignancies, is a useful predictive marker for overall survival (OS) and non-relapse mortality (NRM) in allogeneic HCT, independent of HCT-CI and SF. In this study, we refined the GPS by adding pre-transplant SF to improve its prognostic ability and enable better stratification; we call this revised index the HCT-specific revised Glasgow Prognostic Score (HCT-GPS). We observed that the HCT-GPS more accurately predicted NRM and early-term OS than the GPS. Moreover, the HCT-GPS provides an independent prognostic factor adjusted for the HCT-CI and disease status, and stratifies patients into four risk groups by OS and NRM. Thus, the HCT-GPS is a useful index for predicting early-term complications after allogeneic HCT in patients with hematopoietic diseases.


Assuntos
Neoplasias Hematológicas/diagnóstico , Transplante de Células-Tronco Hematopoéticas/mortalidade , Prognóstico , Adolescente , Adulto , Idoso , Comorbidade , Feminino , Ferritinas/sangue , Neoplasias Hematológicas/mortalidade , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Humanos , Masculino , Pessoa de Meia-Idade , Medição de Risco , Análise de Sobrevida , Transplante Homólogo/efeitos adversos , Transplante Homólogo/mortalidade
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...