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1.
Lab Invest ; 104(4): 102027, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38311062

RESUMEN

Diffuse large B-cell lymphoma (DLBCL) is the most common non-Hodgkin lymphoma. New therapeutic strategies are needed for the treatment of refractory DLBCL. 4-Hydroxy-2-nonenal (4-HNE) is a cytotoxic lipid peroxidation marker, which alters intracellular signaling and induces genetic mutations. Lipid peroxidation is associated with nonapoptotic cell death, called ferroptosis. However, the relationship between 4-HNE accumulation and feroptotic regulators in DLBCL has not been fully evaluated. Here, we aimed to evaluate the accumulation of lipid peroxide and the expression of ferroptosis suppressor protein 1 (FSP1) in DLBCL using immunohistochemistry. We found a significant increase in the expression of FSP1 in cases with nuclear 4-HNE accumulation (P = .021). Both nuclear and cytoplasmic 4-HNE accumulation and FSP1 positivity were independent predictors of worse prognosis. In vitro exposure to 4-HNE resulted in its concentration- and time-dependent intracellular accumulation and increased expression of FSP1. Furthermore, short-term (0.25 and 1.0 µM) or long-term (0.25 µM) exposure to 4-HNE induced resistance to not only apoptosis but also ferroptosis. Taken together, regulation of FSP1 through 4-HNE accumulation may attenuate resistance to cell death in treatment-resistant DLBCL and might help develop novel therapeutic strategies for refractory DLBCL.


Asunto(s)
Aldehídos , Ferroptosis , Linfoma de Células B Grandes Difuso , Humanos , Ferroptosis/genética , Apoptosis , Muerte Celular , Linfoma de Células B Grandes Difuso/genética
2.
Int J Mol Sci ; 23(14)2022 Jul 13.
Artículo en Inglés | MEDLINE | ID: mdl-35887071

RESUMEN

MYC is a major oncogene that plays an important role in cell proliferation in human cancers. Therefore, the mechanism behind MYC regulation is a viable therapeutic target for the treatment of cancer. Comprehensive and efficient screening of MYC regulators is needed, and we had previously established a promoter screening system using fluorescent proteins and the CRISPR library. For the efficient identification of candidate genes, a database was used, for which mRNA expression was correlated with MYC using datasets featuring "Similar" and "Not exactly similar" contexts. INTS14 and ERI2 were identified using datasets featuring the "Similar" context group, and INTS14 and ERI2 were capable of enhancing MYC promoter activity. In further database analysis of human cancers, a higher expression of MYC mRNA was observed in the INTS14 mRNA high-expressing prostate and liver cancers. The knockdown of INTS14 in prostate cell lines resulted in decreased MYC mRNA and protein expression and also induced G0/1 arrest. This study confirmed that CRISPR screening combined with context-matched database screening is effective in identifying genes that regulate the MYC promoter. This method can be applied to other genes and is expected to be useful in identifying the regulators of other proto-oncogenes.


Asunto(s)
Repeticiones Palindrómicas Cortas Agrupadas y Regularmente Espaciadas , Neoplasias Hepáticas , Línea Celular Tumoral , Regulación Neoplásica de la Expresión Génica , Humanos , Neoplasias Hepáticas/genética , Masculino , Proteínas Proto-Oncogénicas c-myc/genética , Proteínas Proto-Oncogénicas c-myc/metabolismo , Proto-Oncogenes , ARN Mensajero/genética
3.
J Stroke Cerebrovasc Dis ; 31(8): 106593, 2022 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-35696736

RESUMEN

BACKGROUND: Postoperative cerebral embolic stroke is a serious complication of pulmonary lobectomy, occurring in 1.1% of patients undergoing lobectomy through video-assisted thoracoscopic surgery (VATS). The mechanism of this complication is thought to be embolic stroke caused by thrombus formed due to stagnation in the pulmonary vein stump after VATS lobectomy. There have been few reports demonstrating the utility of endovascular treatment (EVT) for cerebral embolic stroke after VATS lobectomy. CASE DESCRIPTION: In our case series, cerebral embolic stroke occurred after VATS pulmonary lobectomy for lung cancer, including the left upper lobe in three cases and the right lobe in one. The median duration of ischemic stroke after VATS was 4.5 days (interquartile range, 2-9 days). The median time from stroke onset to puncture was 130 min. Successful recanalization was achieved in all cases, and two patients achieved favorable clinical outcomes (modified Rankin scale, 0-2). CONCLUSION: We report a case series of four patients who underwent EVT for acute embolic stroke after VATS lobectomy for lung cancer. EVT is considered a reasonable and feasible therapeutic option for this condition.


Asunto(s)
Accidente Cerebrovascular Embólico , Accidente Cerebrovascular Isquémico , Neoplasias Pulmonares , Accidente Cerebrovascular , Humanos , Neoplasias Pulmonares/complicaciones , Neoplasias Pulmonares/diagnóstico por imagen , Neoplasias Pulmonares/cirugía , Neumonectomía/efectos adversos , Accidente Cerebrovascular/diagnóstico por imagen , Accidente Cerebrovascular/etiología , Accidente Cerebrovascular/terapia , Cirugía Torácica Asistida por Video/efectos adversos
4.
Int J Mol Sci ; 23(21)2022 Oct 31.
Artículo en Inglés | MEDLINE | ID: mdl-36362023

RESUMEN

Tumor-associated macrophages (TAMs) and abnormalities in cancer cells affect cancer progression and response to therapy. TAMs are a major component of the tumor microenvironment (TME) in breast cancer, with their invasion affecting clinical outcomes. Programmed death-ligand 1 (PD-L1), a target of immune checkpoint inhibitors, acts as a suppressive signal for the surrounding immune system; however, its expression and effect on TAMs and the clinical outcome in breast cancer are unknown. In this study, we used high-throughput multiple immunohistochemistry to spatially and quantitatively analyze TAMs. We subjected 81 breast cancer specimens to immunostaining for CD68, CD163, PD-1, PD-L1, CD20, and pan-CK. In both stromal and intratumoral areas, the triple-negative subtype had significantly more CD68/CD163, CD68/PD-L1, and CD163/PD-L1 double-positive cells than the estrogen receptor (ER)/progesterone receptor (PR) subtype. Interestingly, a higher number of CD68+/PD-L1+/CK-/CD163- TAMs in the intratumoral area was correlated with a favorable recurrence rate (p = 0.048). These findings indicated that the specific subpopulation and localization of TAMs in the TME affect clinical outcomes in breast cancer.


Asunto(s)
Antígeno B7-H1 , Neoplasias de la Mama Triple Negativas , Macrófagos Asociados a Tumores , Humanos , Antígeno B7-H1/metabolismo , Macrófagos/metabolismo , Neoplasias de la Mama Triple Negativas/patología , Microambiente Tumoral , Macrófagos Asociados a Tumores/citología , Biomarcadores de Tumor
5.
Lab Invest ; 101(2): 218-227, 2021 02.
Artículo en Inglés | MEDLINE | ID: mdl-33077808

RESUMEN

The overexpression of glutathione peroxidase 4 (GPX4; an enzyme that suppresses peroxidation of membrane phospholipids) is considered a poor prognostic predictor of diffuse large B-cell lymphoma (DLBCL). However, the mechanisms employed in GPX4 overexpression remain unknown. GPX4 is translated as a complete protein upon the binding of SECISBP2 to the selenocysteine insertion sequence (SECIS) on the 3'UTR of GPX4 mRNA. In this study, we investigated the expression of SECISBP2 and its subsequent regulation of GPX4 and TXNRD1 in DLBCL patients. Moreover, we determined the significance of the expression of these selenoproteins in vitro using MD901 and Raji cells. SECISBP2 was positive in 45.5% (75/165 cases) of DLBCL samples. The SECISBP2-positive group was associated with low overall survival (OS) as compared to the SECISBP2-negative group (P = 0.006). Similarly, the SECISBP2 and GPX4 or TXNRD1 double-positive groups (P < 0.001), as well as the SECISBP2, GPX4, and TXNRD1 triple-positive group correlated with poor OS (P = 0.001), suggesting that SECISBP2 may serve as an independent prognostic predictor for DLBCL (hazard ratio (HR): 2.693, P = 0.008). In addition, western blotting showed a decrease in GPX4 and TXNRD1 levels in SECISBP2-knockout (KO) MD901 and Raji cells. Oxidative stress increased the accumulation of reactive oxygen species in SECISBP2-KO cells (MD901; P < 0.001, Raji; P = 0.020), and reduced cell proliferation (MD901; P = 0.001, Raji; P = 0.030), suggesting that SECISBP2-KO suppressed resistance to oxidative stress. Doxorubicin treatment increased the rate of cell death in SECISBP2-KO cells (MD901; P < 0.001, Raji; P = 0.048). Removal of oxidative stress inhibited the altered cell death rate. Taken together, our results suggest that SECISBP2 may be a novel therapeutic target in DLBCL.


Asunto(s)
Linfoma de Células B Grandes Difuso , Proteínas de Unión al ARN , Selenoproteínas , Anciano , Línea Celular Tumoral , Femenino , Regulación Neoplásica de la Expresión Génica/genética , Técnicas de Inactivación de Genes , Humanos , Linfoma de Células B Grandes Difuso/diagnóstico , Linfoma de Células B Grandes Difuso/genética , Linfoma de Células B Grandes Difuso/metabolismo , Linfoma de Células B Grandes Difuso/mortalidad , Masculino , Persona de Mediana Edad , Estrés Oxidativo/genética , Fosfolípido Hidroperóxido Glutatión Peroxidasa/genética , Fosfolípido Hidroperóxido Glutatión Peroxidasa/metabolismo , Pronóstico , Proteínas de Unión al ARN/genética , Proteínas de Unión al ARN/metabolismo , Selenoproteínas/genética , Selenoproteínas/metabolismo , Tiorredoxina Reductasa 1/genética , Tiorredoxina Reductasa 1/metabolismo
6.
Cancer Sci ; 112(12): 4920-4930, 2021 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34653294

RESUMEN

BLNK (BASH/SLP-65) encodes an adaptor protein that plays an important role in B-cell receptor (BCR) signaling. Loss-of-function mutations in this gene are observed in human pre-B acute lymphoblastic leukemia (ALL), and a subset of Blnk knock-out (KO) mice develop pre-B-ALL. To understand the molecular mechanism of the Blnk mutation-associated pre-B-ALL development, retroviral tagging was applied to KO mice using the Moloney murine leukemia virus (MoMLV). The Blnk mutation that significantly accelerated the onset of MoMLV-induced leukemia and increased the incidence of pre-B-ALL Cebpb was identified as a frequent site of retroviral integration, suggesting that its upregulation cooperates with Blnk mutations. Transgenic expression of the liver-enriched activator protein (LAP) isoform of Cebpb reduced the number of mature B-lymphocytes in the bone marrow and inhibited differentiation at the pre-BI stage. Furthermore, LAP expression significantly accelerated leukemogenesis in Blnk KO mice and alone acted as a B-cell oncogene. Furthermore, an inverse relationship between BLNK and C/EBPß expression was also noted in human pre-B-ALL cases, and the high level of CEBPB expression was associated with short survival periods in patients with BLNK-downregulated pre-B-ALL. These results indicate the association between the C/EBPß transcriptional network and BCR signaling in pre-B-ALL development and leukemogenesis. This study gives insight into ALL progression and suggests that the BCR/C/EBPß pathway can be a therapeutic target.


Asunto(s)
Proteínas Adaptadoras Transductoras de Señales/genética , Proteína beta Potenciadora de Unión a CCAAT/genética , Virus de la Leucemia Murina de Moloney/fisiología , Mutación , Leucemia-Linfoma Linfoblástico de Células Precursoras B/genética , Animales , Proteína beta Potenciadora de Unión a CCAAT/metabolismo , Perfilación de la Expresión Génica , Regulación Leucémica de la Expresión Génica , Humanos , Ratones , Ratones Noqueados , Ratones Transgénicos , Análisis de Secuencia por Matrices de Oligonucleótidos , Leucemia-Linfoma Linfoblástico de Células Precursoras B/metabolismo , Leucemia-Linfoma Linfoblástico de Células Precursoras B/virología , Regulación hacia Arriba , Integración Viral
7.
Int J Mol Sci ; 22(22)2021 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-34830205

RESUMEN

CRISPR/Cas has emerged as an excelle nt gene-editing technology and is used worldwide for research. The CRISPR library is an ideal tool for identifying essential genes and synthetic lethality targeted for cancer therapies in human cancers. Synthetic lethality is defined as multiple genetic abnormalities that, when present individually, do not affect function or survival, but when present together, are lethal. Recently, many CRISPR libraries are available, and the latest libraries are more accurate and can be applied to few cells. However, it is easier to efficiently search for cancer targets with their own screenings by effectively using databases of CRISPR screenings, such as Depmap portal, PICKLES (Pooled In-Vitro CRISPR Knockout Library Essentiality Screens), iCSDB, Project Score database, and CRISP-view. This review will suggest recent optimal CRISPR libraries and effective databases for Novel Approaches in the Discovery and Design of Targeted Therapies.


Asunto(s)
Sistemas CRISPR-Cas , Bases de Datos Genéticas , Descubrimiento de Drogas/métodos , Detección Precoz del Cáncer/métodos , Terapia Molecular Dirigida/métodos , Neoplasias/tratamiento farmacológico , Neoplasias/genética , Biomarcadores de Tumor/genética , Edición Génica/métodos , Biblioteca de Genes , Genes Esenciales , Genoma Humano , Humanos , ARN Guía de Kinetoplastida/genética , Mutaciones Letales Sintéticas
8.
Lab Invest ; 100(3): 353-362, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-31527828

RESUMEN

Cancer cells, including malignant lymphoma cells, alter their metabolism, termed "metabolic reprograming," on initiation of malignant transformation as well as upon accumulation of genetic abnormalities. Here, to identify a novel therapeutic target involved in the metabolic changes during malignant lymphoma, we performed global analyses combined with shotgun proteomics, in silico database analysis, and clinic-pathologic analysis of nonneoplastic lymphoid tissue and malignant lymphoma tissue and verified the molecular functions in vitro. In total, 2002 proteins were detected from both samples and proteins related to fatty acid beta-oxidation (FAO) were detected more frequently in malignant lymphoma tissue. Consequently, the most frequently detected protein, the mitochondrial trifunctional enzyme subunit-alpha (HADHA), was identified as a potential target. Immunohistochemical analyses revealed that HADHA tended to be overexpressed in a high-grade subtype of malignant lymphoma tissue. Clinicopathologic study revealed that HADHA overexpression was correlated with significantly worse overall survival (P = 0.013) and was an independent prognostic predictor in diffuse large B-cell lymphoma (P = 0.027). In vitro, downregulation of HADHA negatively regulated cell growth by causing G0/G1 arrest (P = 0.0008) similar to treatment with etomoxir, an inhibitor of FAO (P = 0.032). Moreover, downregulation of HADHA increased the susceptibility to doxorubicin (P = 0.002) and etoposide (P = 0.004). Moreover, these phenotypes were confirmed in an HADHA knockout system. Thus, we provide a basis for a novel therapeutic strategy through the regulation of HADHA and FAO in patients with refractory malignant lymphoma.


Asunto(s)
Linfoma , Subunidad alfa de la Proteína Trifuncional Mitocondrial , Antineoplásicos/farmacología , Línea Celular Tumoral , Supervivencia Celular/efectos de los fármacos , Regulación hacia Abajo , Descubrimiento de Drogas , Ácidos Grasos/metabolismo , Femenino , Humanos , Tejido Linfoide/química , Tejido Linfoide/metabolismo , Linfoma/metabolismo , Linfoma/mortalidad , Linfoma/patología , Masculino , Persona de Mediana Edad , Subunidad alfa de la Proteína Trifuncional Mitocondrial/antagonistas & inhibidores , Subunidad alfa de la Proteína Trifuncional Mitocondrial/genética , Subunidad alfa de la Proteína Trifuncional Mitocondrial/metabolismo , Oxidación-Reducción , Proteoma/análisis , Proteoma/metabolismo
9.
Pathol Int ; 70(2): 63-71, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-31709722

RESUMEN

Pathological phenotypes of myeloid neoplasms are closely related to genetic/chromosomal abnormalities of neoplastic cells whereas the bone marrow microenvironment, including stromal elements and hematopoietic stem cell niche cells, have a great influence on the differentiation/proliferation of both hematopoietic and neoplastic cells. The pathology of myeloid neoplasms might be generated through the interaction of hematopoietic (stem) cells and stromal cells. The present study aims to provide the morphological/functional aspects of the bone marrow environment in myeloid neoplasms. Among the myeloid neoplasms, myelodysplastic syndromes (MDS) exhibit significant and complex interactions between neoplastic cells and stromal cells. Hematopoietic cells in MDS are greatly influenced by macrophages/niche cells via several signaling pathways. As such, the pathological significance of cell proliferation, cell apoptosis, and anti-apoptosis signals in the bone marrow of myeloid neoplasms, especially MDS bone marrow, will be discussed.


Asunto(s)
Síndromes Mielodisplásicos/patología , Trastornos Mieloproliferativos/patología , Células Madre Neoplásicas/patología , Nicho de Células Madre , Animales , Médula Ósea/patología , Células Madre Hematopoyéticas/patología , Humanos
10.
Med Mol Morphol ; 53(3): 156-167, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-31932969

RESUMEN

PVT1 is a long-noncoding RNA and is highly expressed in various cancers including prostate cancers with stabilizing MYC protein. To characterize the objective biological features of the different morphological components such as Gleason patterns (GP) in prostate cancer, biopsy specimens containing only single pure GP (GP3, GP4, GP5) are used to analyze the relationship between PVT1 expression and MYC protein expression. The expressions of PVT1 and MYC were analyzed by quantitative PCR and the labeling index (LI) of MYC protein by immunohistochemical staining. PVT1, MYC, and MYC protein were highly expressed in GP 4, and interestingly the expression between PVT1 and MYC LI significantly correlated only in GP 4. In vitro experiments, the expression of MYC protein was slightly reduced by small interfering RNA against PVT1, while strongly reduced against specifically circular PVT1, splicing variants derived from the PVT1. Taken together, the expression characteristics of PVT1, MYC, and MYC protein differed depending on the GP. In particular, circular PVT1 might be strongly involved in the stabilization of MYC protein in GP4 and suggest different biological features.


Asunto(s)
Regulación Neoplásica de la Expresión Génica , Neoplasias de la Próstata/genética , Neoplasias de la Próstata/patología , Proteínas Proto-Oncogénicas c-myc/metabolismo , ARN Largo no Codificante/genética , Anciano , Anciano de 80 o más Años , Secuencia de Bases , Regulación hacia Abajo/genética , Perfilación de la Expresión Génica , Silenciador del Gen , Humanos , Antígeno Ki-67/metabolismo , Masculino , Persona de Mediana Edad , Clasificación del Tumor , Estabilidad Proteica , Proteínas Proto-Oncogénicas c-myc/genética , ARN Largo no Codificante/metabolismo
11.
Lab Invest ; 98(5): 609-619, 2018 05.
Artículo en Inglés | MEDLINE | ID: mdl-29463878

RESUMEN

Regulation of oxidative stress and redox systems has important roles in carcinogenesis and cancer progression, and for this reason has attracted much attention as a new area of cancer therapeutic targets. Glutathione peroxidase 4 (GPX4), an antioxidant enzyme, has biological important functions such as signaling cell death by suppressing peroxidation of membrane phospholipids. However, few studies exist on the expression and clinical relevance of GPX4 in malignant lymphomas such as diffuse large B-cell lymphoma. In this study, we assessed the expression of GPX4 immunohistochemically. GPX4 was expressed in 35.5% (33/93) cases of diffuse large B-cell lymphoma. The GPX4-positive group had poor overall survival (P = 0.0032) and progression-free survival (P = 0.0004) compared with those of the GPX4-negative group. In a combined analysis of GPX4 and 8-hydroxydeoxyguanosine (8-OHdG), an oxidative stress marker, there was a negative correlation between GPX4 and 8-hydroxydeoxyguanosine (P = 0.0009). The GPX4-positive and 8-hydroxydeoxyguanosine-negative groups had a significantly worse prognosis than the other groups in both overall survival (P = 0.0170) and progression-free survival (P = 0.0005). These results suggest that the overexpression of GPX4 is an independent prognostic predictor in diffuse large B-cell lymphoma. Furthermore, in vitro analysis demonstrated that GPX4-overexpressing cells were resistant to reactive oxygen species-induced cell death (P = 0.0360). Conversely, GPX4-knockdown cells were sensitive to reactive oxygen species-induced cell death (P = 0.0111). From these data, we conclude that GPX4 regulates reactive oxygen species-induced cell death. Our results suggest a novel therapeutic strategy using the mechanism of ferroptosis, as well as a novel prognostic predictor of diffuse large B-cell lymphoma.


Asunto(s)
Apoptosis , Glutatión Peroxidasa/fisiología , Linfoma de Células B Grandes Difuso/patología , Especies Reactivas de Oxígeno/metabolismo , 8-Hidroxi-2'-Desoxicoguanosina , Células Cultivadas , Desoxiguanosina/análogos & derivados , Desoxiguanosina/análisis , Glutatión Peroxidasa/análisis , Glutatión Peroxidasa/genética , Humanos , Linfoma de Células B Grandes Difuso/tratamiento farmacológico , Linfoma de Células B Grandes Difuso/enzimología , Linfoma de Células B Grandes Difuso/mortalidad , Fosfolípido Hidroperóxido Glutatión Peroxidasa
12.
J Hum Genet ; 63(2): 179-186, 2018 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-29158600

RESUMEN

CRISPR/Cas9-based tools have rapidly developed in recent years. These include CRISPR-based gene activation (CRISPRa) or inhibition (CRISPRi), for which there are libraries. CRISPR libraries for loss of function have been widely used to identify new biological mechanisms, such as drug resistance and cell survival signals. CRISPRa is highly useful in screening for gain of functions, and CRISPRi is a more powerful tool than RNA interference (RNAi) libraries in screening for loss of functions. Positive selection using a CRISPR library can detect survival cells with specific conditions, such as drug treatment, and it can easily clarify drug resistance mechanisms. Negative selection is capable of detecting dead or slow-growing cells efficiently, and it can identify survival-essential genes, which can be promising candidates for molecularly targeted drugs. In addition, negative selection can be applied for synthetic lethality interactions, where the perturbation of both genes simultaneously results in the loss of viability, but that of either gene alone does not affect viability. This mechanism is highly important to identifying the optimal combination of molecularly targeted drugs. Survival-co-essential genes in cancer cells can be identified using new methods, such as the paired guide RNA system and in combination with single-cell RNA sequencing techniques. These efficient methods can clarify interesting biological mechanisms and suggest candidates for molecularly targeted drugs. This review identifies what types of screenings were performed and suggests ideas for the next CRISPR screenings to develop new drugs.


Asunto(s)
Sistemas CRISPR-Cas , Sistemas de Liberación de Medicamentos/métodos , Descubrimiento de Drogas/métodos , Biblioteca de Genes , Animales , Humanos
15.
Lab Invest ; 94(11): 1212-23, 2014 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-25199050

RESUMEN

The bone marrow microenvironment, known as 'hematopoietic stem cell niche,' is essential for the survival and maintenance of hematopoietic stem cells. Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell diseases, which eventually result in leukemic transformation (acute myelogenous leukemia with myelodysplasia-related changes, AML-MRC). However, the precise components and functions of the MDS niche remain unclear. Recently, CXCL12-abundant reticular cells were shown to act as a hematopoietic stem cell niche in the murine bone marrow. Using immunohistochemistry, we show here that CXCL12(+) cells were located in the cellular marrow or perivascular area, and were in contact with CD34(+) hematopoietic cells in control and MDS/AML-MRC bone marrow. MDS bone marrow exhibited higher CXCL12(+) cell density than control or AML, not otherwise specified (AML-NOS) bone marrow. Moreover, AML-MRC bone marrow also exhibited higher CXCL12(+) cell density than control bone marrow. CXCL12(+) cell density correlated positively with bone marrow blast ratio in MDS cases. CXCL12 mRNA level was also higher in MDS bone marrow than in control or AML-NOS bone marrow. In vitro coculture analysis revealed that overexpression of CXCL12 in stromal cells upregulated BCL-2 expression of leukemia cell lines. Triple immunostaining revealed that the CD34(+) hematopoietic cells of MDS bone marrow in contact with CXCL12(+) cells were BCL-2-positive and TUNEL-negative. In the bone marrow of MDS cases, CXCL12-high group showed significantly higher Bcl-2(+)/CD34(+) cell ratio and lower apoptotic cell ratio than CXCL12-low group. Moreover, CXCL12-high refractory cytopenia with multilineage dysplasia (RCMD) cases had a greater tendency to progress to refractory anemia with excess blasts (RAEBs) or AML-MRC than CXCL12-low RCMD cases. These results suggest that CXCL12(+) cells constitute the niche for CD34(+) hematopoietic cells, and may be associated with the survival/antiapoptosis of CD34(+) hematopoietic cells and disease progression in MDS. Thus, CXCL12(+) cells may represent a novel MDS therapeutic target.


Asunto(s)
Médula Ósea/metabolismo , Quimiocina CXCL12/metabolismo , Células Madre Hematopoyéticas/metabolismo , Leucemia Mieloide Aguda/metabolismo , Síndromes Mielodisplásicos/etiología , Células 3T3 , Animales , Antígenos CD34/metabolismo , Apoptosis , Médula Ósea/patología , Estudios de Casos y Controles , Progresión de la Enfermedad , Humanos , Células K562 , Leucemia Mieloide Aguda/patología , Ratones , Síndromes Mielodisplásicos/metabolismo , Síndromes Mielodisplásicos/patología , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo
16.
Hypertension ; 81(2): 361-371, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38095094

RESUMEN

BACKGROUND: Recent advances in omics techniques have allowed detailed genetic characterization of aldosterone-producing adenoma (APA). The pathogenesis of APA is characterized by tumorigenesis-associated aldosterone synthesis. The pathophysiological intricacies of APAs have not yet been elucidated at the level of individual cells. Therefore, a single-cell level analysis is speculated to be valuable in studying the differentiation process of APA. METHODS: We conducted single-nucleus RNA sequencing of APAs with KCNJ5 mutation and nonfunctional adenomas obtained from 3 and 2 patients, respectively. RESULTS: The single-nucleus RNA sequencing revealed the intratumoral heterogeneity of APA and identified cell populations consisting of a shared cluster of nonfunctional adenoma and APA. In addition, we extracted 2 cell fates in APA and obtained a cell population specialized in aldosterone synthesis. Genes related to ribosomes and neurodegenerative diseases were upregulated in 1 of these fates, whereas those related to the regulation of glycolysis were upregulated in the other fate. Furthermore, the total RNA reads in the nucleus were higher in hormonally activated clusters, indicating a marked activation of transcription per cell. CONCLUSIONS: The single-nucleus RNA sequencing revealed intratumoral heterogeneity of APA with KCNJ5 mutation. The observation of 2 cell fates in KCNJ5-mutated APAs provides the postulation that a heterogeneous process of cellular differentiation was implicated in the pathophysiological mechanisms underlying APA tumors.


Asunto(s)
Adenoma , Neoplasias de la Corteza Suprarrenal , Adenoma Corticosuprarrenal , Hiperaldosteronismo , Humanos , Aldosterona , Adenoma Corticosuprarrenal/genética , Adenoma Corticosuprarrenal/patología , Adenoma/genética , Adenoma/patología , Canales de Potasio Rectificados Internamente Asociados a la Proteína G/genética , Mutación , Neoplasias de la Corteza Suprarrenal/genética , Hiperaldosteronismo/genética
17.
Gene ; 893: 147916, 2024 Jan 30.
Artículo en Inglés | MEDLINE | ID: mdl-37866661

RESUMEN

Pancreatic neuroendocrine carcinoma (NEC) and mixed neuroendocrine-non-neuroendocrine neoplasm (MiNEN) are rare pancreatic malignant tumors, and comprehensive gene analyses are scarce. In this study, six NECs and six MiNENs were collected, immunohistochemistry for synaptophysin, chromogranin A, INSM1, Ki-67, and Rb was conducted, and KRAS mutational status was examined. Among these cases, comprehensive gene expression analysis of oncogene pathways using nCounter® were performed with six NECs and four MiNENs, and those data were compared with that of three pancreatic ductal adenocarcinomas (PDACs), with that of three normal pancreatic ducts, and with each other. By dividing NEC and MiNEN cases into KRAS-mutated group and KRAS-wild group, the difference of clinicopathological data and gene expression profiling data were examined between the two groups. Compared to the data of normal pancreatic epithelium, all 13 cancer-related pathways were upregulated in PDAC, MiNEN, and NEC group with more upregulation in this order. Compared to the data of PDAC, genes of DNA Damage repair pathway was most upregulated both in NECs and MiNENs. Regarding the difference between KRAS-mutated and KRAS-wild groups, several genes were differentially expressed between the two, where MMP7 was the upregulated gene with highest p-value and NKD1 was the downregulated gene with highest p-value in KRAS-mutated group. From the extent of upregulation of 13 pathways, MiNEN was considered more progressed stage than PDAC, and NEC was considered more progressed than MiNEN. From the comparison of KRAS-mutated and KRAS-wild NECs and MiNENs, several differentially expressed genes were identified in this study.


Asunto(s)
Carcinoma Neuroendocrino , Tumores Neuroendocrinos , Neoplasias Pancreáticas , Humanos , Proteínas Proto-Oncogénicas p21(ras)/genética , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patología , Carcinoma Neuroendocrino/genética , Carcinoma Neuroendocrino/patología , Perfilación de la Expresión Génica , Tumores Neuroendocrinos/genética , Tumores Neuroendocrinos/patología , Proteínas Represoras/genética
18.
Cancers (Basel) ; 16(11)2024 Jun 04.
Artículo en Inglés | MEDLINE | ID: mdl-38893259

RESUMEN

Lung squamous cell carcinoma (LSCC) is refractory to various therapies for non-small cell cancer; therefore, new therapeutic approaches are required to improve the prognosis of LSCC. Although immunotherapies targeting B7 family molecules were explored as treatments for several cancer types, the expression and significance of B7-H3 in the tumor microenvironment (TME) and its relationship with other immune checkpoint molecules have not yet been investigated in detail. We used high-throughput quantitative multiplex immunohistochemistry to examine B7-H3 expression in the TME. We investigated the relationship between B7-H3 expression and prognosis as well as changes in the TME with B7-H3 expression using 110 surgically resected pathological specimens retrospectively. We examined the correlation between B7-H3 and programmed cell death-ligand 1 (PD-L1) expression in single cells. High B7-H3 expression in tumor cells was associated with a better prognosis and a significant increase in the number of CD163+PD-L1+ macrophages. Quantitative analysis revealed that there is a positive correlation between B7-H3 and PD-L1 expression in tumor and stromal cells, as well as in intratumoral tumor-infiltrating lymphocytes and tumor-associated macrophages in the same cells. CD68+, CD163+, and CK+ cells with PD-L1+ phenotypes had higher B7-H3 expression compared to PD-L1- cells. Our findings demonstrate a correlation between B7-H3 and PD-L1 expression in the same cells, indicating that therapies targeting B7-H3 could provide additional efficacy in patients refractory to PD-L1-targeting therapies.

19.
Front Immunol ; 15: 1390873, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-39136017

RESUMEN

Background: In view of improving biomarkers predicting the efficacy of immunotherapy for head and neck squamous cell carcinoma (R/M HNSCC), this multicenter retrospective study aimed to identify clinical, tumor microenvironmental, and genomic factors that are related to therapeutic response to the anti- Programmed cell death protein 1 (PD-1) antibody, nivolumab, in patients with R/M HNSCC. Methods: The study compared 53 responders and 47 non-responders, analyzing formalin-fixed paraffin-embedded samples using 14-marker multiplex immunohistochemistry and targeted gene sequencing. Results: Of 100 patients included, responders had significantly lower smoking and alcohol index, higher incidence of immune related adverse events, and higher PD-1 ligand (PD-L1) expression in immune cells as well as PD-L1 combined positive score (CPS) than non-responders. The frequency of natural killer cells was associated with nivolumab response in patients with prior cetuximab use, but not in cetuximab-naïve status. Age-stratified analysis showed nivolumab response was linked to high CPS and lymphoid-inflamed profiles in patients aged ≥ 65. In contrast, lower NLR in peripheral blood counts was associated with response in patients aged < 65. Notably, TP53 mutation-positive group had lower CPS and T cell densities, suggesting an immune-excluded microenvironment. Patients with altered tumor suppressor gene pathways, including TP53, CDKN2A, and SMAD4 mutations, had lower CPS, higher smoking index, and were associated with poor responses. Conclusion: Nivolumab treatment efficacy in HNSCC is influenced by a combination of clinical factors, age, prior treatment, immune environmental characteristics, and gene mutation profiles.


Asunto(s)
Neoplasias de Cabeza y Cuello , Nivolumab , Carcinoma de Células Escamosas de Cabeza y Cuello , Microambiente Tumoral , Humanos , Microambiente Tumoral/inmunología , Nivolumab/uso terapéutico , Nivolumab/efectos adversos , Masculino , Carcinoma de Células Escamosas de Cabeza y Cuello/tratamiento farmacológico , Carcinoma de Células Escamosas de Cabeza y Cuello/inmunología , Carcinoma de Células Escamosas de Cabeza y Cuello/genética , Femenino , Anciano , Persona de Mediana Edad , Neoplasias de Cabeza y Cuello/tratamiento farmacológico , Neoplasias de Cabeza y Cuello/inmunología , Neoplasias de Cabeza y Cuello/genética , Estudios Retrospectivos , Biomarcadores de Tumor/genética , Antineoplásicos Inmunológicos/uso terapéutico , Antineoplásicos Inmunológicos/efectos adversos , Inhibidores de Puntos de Control Inmunológico/uso terapéutico , Inhibidores de Puntos de Control Inmunológico/efectos adversos , Resultado del Tratamiento , Adulto , Antígeno B7-H1/genética , Anciano de 80 o más Años , Mutación , Genómica/métodos
20.
Histopathology ; 62(3): 414-20, 2013 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-23339364

RESUMEN

AIMS: Multidrug resistance (MDR) in B-cell lymphomas still constitutes a major obstacle to the effectiveness of chemotherapy even in the anti-CD20 antibody therapy era. The aim of this study was to investigate the expression of MDR-associated molecules in reactive lymphadenopathy (RL), follicular lymphoma (FL), and diffuse large B-cell lymphoma (DLBCL). METHODS AND RESULTS: The expression of mRNA for ABC-transporter family genes was determined by real-time RT-PCR in lymph nodes from RL, FL, and DLBCL cases. MDR1 exhibited significantly stronger expression in RL, FL, and DLBCL than Raji B-cell lymphoma cells. RL and FL showed significantly higher expression than DLBCL. Immunohistochemically, MDR1 positive cells were localized in the germinal centers of RL and center of the nodular lesions of FL showing associations with CD21 positive follicular dendritic cells (FDCs). Raji cells were co-cultured with FDC sarcoma-derived cells and the expression of MDR1 and drug resistance were analyzed. The co-culture of Raji cells with FDCs induced strong expression of MDR1 and introduced resistance to doxorubicin-induced apoptosis. CONCLUSIONS: These results suggest that FDCs induce MDR1 expression in reactive as well as neoplastic B-cells. Inhibition of the interaction of FDCs with B-cells may provide a novel strategy for treating the chemotherapy resistant fraction.


Asunto(s)
Miembro 1 de la Subfamilia B de Casetes de Unión a ATP/biosíntesis , Células Dendríticas Foliculares/metabolismo , Resistencia a Antineoplásicos/genética , Linfoma de Células B/genética , Apoptosis/fisiología , Linfocitos B/metabolismo , Línea Celular Tumoral , Técnicas de Cocultivo , Resistencia a Múltiples Medicamentos/fisiología , Humanos , Inmunohistoquímica , Linfoma de Células B/metabolismo , ARN Mensajero/análisis , Reacción en Cadena en Tiempo Real de la Polimerasa , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa
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