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1.
Environ Toxicol ; 39(5): 3198-3210, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38351887

RESUMO

In this presentation, we explored the molecular mechanisms of N. nucifera leaf water extracts (NLWEs) and polyphenol extract (NLPE) on scopolamine-induced cell apoptosis and cognition defects. The administration of NLWE and NLPE did not alter the body weight and serum biomarker rs and significantly ameliorated scopolamine-induced cognition impairment according to Y-maze test analysis. In mice, treatment with scopolamine disrupted normal histoarchitecture in the hippocampus, whereas the administration of NLWE and NLPE reversed the phenomenon. Western blot analysis revealed that scopolamine mitigated the expression of doublecortin (DCX), nestin, and NeuN, and cotreatment with NLWE or NLPE significantly recovered the expression of these proteins. NLWE and NLPE upregulated DCX and NeuN expression in the hippocampus region, as evidenced by immunohistochemical staining analysis of scopolamine-treated mice. NLWE and NLPE obviously elevated brain-derived neurotrophic factor (BDNF) and enhanced its downstream proteins activity. NLWE and NLPE attenuated scopolamine-induced apoptosis by reducing Bax and increased Bcl-2 expression. In addition, scopolamine also triggered apoptosis in human neuroblastoma SH-SY5Y cells whereas co-treatment with NLWE or quercetin-3-glucuronide (Q3G) reversed the phenomenon. NLWE or Q3G enhanced Bcl-2 and reduced Bax expression in the presence of scopolamine in SH-SY5Y cells. NLWE or Q3G recovered the inhibitory effects of scopolamine on neurogenesis and BDNF signals in SH-SY5Y cells. Overall, our results revealed that N. nucifera leaf extracts and Q3G promoted adult hippocampus neurogenesis and prevented apoptosis to mitigate scopolamine-induced cognition dysfunction through the regulation of BDNF signaling pathway.


Assuntos
Nelumbo , Neuroblastoma , Camundongos , Humanos , Animais , Escopolamina/farmacologia , Escopolamina/metabolismo , Fator Neurotrófico Derivado do Encéfalo/metabolismo , Nelumbo/química , Nelumbo/metabolismo , Proteína X Associada a bcl-2/metabolismo , Neuroblastoma/metabolismo , Hipocampo/metabolismo , Neurogênese , Aprendizagem em Labirinto , Extratos Vegetais/química , Cognição
2.
Nat Methods ; 17(9): 947, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32713945

RESUMO

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

3.
Nat Methods ; 17(7): 689-693, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-32541852

RESUMO

We present split-FISH, a multiplexed fluorescence in situ hybridization method that leverages a split-probe design to achieve enhanced specificity. Split-FISH reduces off-target background fluorescence, decreases false positives and enables accurate RNA profiling in uncleared tissues. We demonstrate the efficacy of split-FISH on various mouse tissues by quantifying the distribution and abundance of 317 genes in single cells and reveal diverse localization patterns for spatial regulation of the transcriptome in complex tissues.


Assuntos
Hibridização in Situ Fluorescente/métodos , RNA/análise , Animais , Células Cultivadas , Humanos , Camundongos , Análise de Célula Única , Transcriptoma
4.
Mol Cell ; 52(5): 693-706, 2013 Dec 12.
Artigo em Inglês | MEDLINE | ID: mdl-24332177

RESUMO

Epigenetic regulation plays a critical role in glioblastoma (GBM) tumorigenesis. However, how microRNAs (miRNAs) and cytokines cooperate to regulate GBM tumor progression is still unclear. Here, we show that interleukin-6 (IL-6) inhibits miR142-3p expression and promotes GBM propagation by inducing DNA methyltransferase 1-mediated hypermethylation of the miR142-3p promoter. Interestingly, miR142-3p also suppresses IL-6 secretion by targeting the 3' UTR of IL-6. In addition, miR142-3p also targets the 3' UTR and suppresses the expression of high-mobility group AT-hook 2 (HMGA2), leading to inhibition of Sox2-related stemness. We further show that HMGA2 enhances Sox2 expression by directly binding to the Sox2 promoter. Clinically, GBM patients whose tumors present upregulated IL-6, HMGA2, and Sox2 protein expressions and hypermethylated miR142-3p promoter also demonstrate poor survival outcome. Orthotopic delivery of miR142-3p blocks IL-6/HMGA2/Sox2 expression and suppresses stem-like properties in GBM-xenotransplanted mice. Collectively, we discovered an IL-6/miR142-3p feedback-loop-dependent regulation of GBM malignancy that could be a potential therapeutic target.


Assuntos
Neoplasias Encefálicas/genética , Glioblastoma/genética , Interleucina-6/genética , MicroRNAs/genética , Regiões 3' não Traduzidas , Animais , Sequência de Bases , Linhagem Celular Tumoral , Metilação de DNA , Epigênese Genética , Feminino , Proteína HMGA2/genética , Humanos , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Nus , Pessoa de Meia-Idade , Dados de Sequência Molecular , Regiões Promotoras Genéticas , Fatores de Transcrição SOXB1/genética , Regulação para Cima
5.
Arch Biochem Biophys ; 692: 108511, 2020 10 15.
Artigo em Inglês | MEDLINE | ID: mdl-32710883

RESUMO

(-)-Epigallocatechin-3-gallate (EGCG), the most abundant catechin component in green tea, has been reported to attenuate age-associated insulin resistance, lipogenesis and loss of muscle mass through restoring Akt activity in skeletal muscle in our previous and present studies. Accumulated data has suggested that polyphenols regulate signaling pathways involved in aging process such as inflammation and oxidative stress via modulation of miRNA expression. Here we found that miRNA-486-5p was significantly decreased in both aged senescence accelerated mouse-prone 8 (SAMP8) mice and late passage C2C12 cells. Thus, we further investigated the regulatory effect of EGCG on miRNA-486-5p expression in age-regulated muscle loss. SAMP8 mice were fed with chow diet containing without or with 0.32% EGCG from aged 32 weeks for 8 weeks. Early passage (<12 passages) and late passage (>30 passages) of C2C12 cells were treated without or with EGCG at concentrations of 50 µM for 24h. Our data showed that EGCG supplementation increased miRNA-486-5p expression in both aged SAMP8 mice and late passage C2C12 cells. EGCG stimulated AKT phosphorylation and inhibited FoxO1a-mediated MuRF1 and Atrogin-1 transcription via up-regulating the expression of miR-486 in skeletal muscle of 40-wk-old SAMP8 mice as well as late passage C2C12 cells. In addition, myostatin expression was increased in late passage C2C12 cells and anti-myostatin treatment upregulated the expression of miR-486-5p. Our results identify a unique mechanism of a dietary constituent of green tea and suggest that use of EGCG or compounds derived from it attenuates age-associated muscle loss via myostatin/miRNAs/ubiquitin-proteasome signaling.


Assuntos
Envelhecimento/metabolismo , Catequina/análogos & derivados , Regulação da Expressão Gênica/efeitos dos fármacos , MicroRNAs/metabolismo , Proteínas Musculares/biossíntese , Atrofia Muscular/metabolismo , Miostatina/biossíntese , Envelhecimento/efeitos dos fármacos , Envelhecimento/genética , Envelhecimento/patologia , Animais , Catequina/química , Catequina/farmacologia , Linhagem Celular , Camundongos , Camundongos Transgênicos , MicroRNAs/genética , Proteínas Musculares/genética , Atrofia Muscular/genética , Atrofia Muscular/patologia , Miostatina/genética , Chá/química
6.
Biogerontology ; 21(3): 367-380, 2020 06.
Artigo em Inglês | MEDLINE | ID: mdl-32130580

RESUMO

The senescence-accelerated mouse (SAM) prone 8 (SAMP8) has been demonstrated for muscular aging research including sarcopenia, but its underlying mechanisms remain scarce. Physiological indices and histology of skeletal muscle were analyzed in SAMP8 mice at different ages. SAMP8 mice exhibited typical features of sarcopenia at 40 weeks of age and were more time-efficient than that at 88 weeks of age in bothSAM resistant 1 (SAMR1) and C57BL/6 mice. Increase in FoxO3a-mediated transcription of Atrogin-1 and MuRF1 and decrease in phosphorylated mTOR/P70s6k were observed at week 40 in SAMP8 mice. High oxidative stress was observed from week 24 and persisted to week 40 in SAMP8 mice evidenced by overexpression of protein carbonyl groups and reduced activities of CAT, SOD, and GPx. Downregulation of genes involved in mitochondrial biogenesis (PGC-1α, Nrf-1, Tfam, Ndufs8, and Cox5b) and in mitochondrial dynamics fission (Mfn2 and Opa1) from week 24 indicated dysregulation of mitochondrial quality control in SAMP8 mice. Impaired autophagic flux was observed in SAMP8 mice evidenced by elevated Atg13 and LC3-II accompanied with the accumulation of P62 and LAMP1. Increases in inflammatory factors (IL-6 and MCP-1), adipokines (leptin and resistin), and myostatin in serum at week 32 and decline in Pax7+ satellite cell resided next to muscle fibers at week 24 implied that muscle microenvironment contributed to the progression of sarcopenia in SAMP8 mice. Our data suggest that early alterations of mitochondrial quality control and autophagic flux worsen muscle microenvironment prior to the onset of sarcopenia.


Assuntos
Envelhecimento , Mitocôndrias , Sarcopenia , Animais , Camundongos , Camundongos Endogâmicos C57BL , Músculo Esquelético/metabolismo , Sarcopenia/metabolismo
8.
Environ Toxicol ; 32(11): 2327-2340, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28804948

RESUMO

Lotus (Nelumbo nucifera Gaertn) possesses antioxidant, hepatoprotective, and anticancer potential. This study determined the protective role of aqueous extract from Nelumbo nucifera leaves (NLE) against N-diethylnitrosamine (DEN)-induced oxidative stress and hepatocellular carcinogenesis in a sample of Sprague-Dawley rats. NLE was fed orally to rats in which hepatic carcinoma was induced with DEN for 12 weeks. Five groups of 12 rats each were used for the study: Group I (control group) rats received distilled water; Group II rats were induced with DEN; Group III rats were induced with DEN and cotreated with 0.5% NLE; Group IV rats were induced with DEN and cotreated with 1.0% NLE; and Group V rats were induced with DEN and cotreated with 2.0% NLE. Clinical chemistry, organ weight, inflammatory marker, protein expression, enzyme, and antioxidant analyses were conducted. NLE administration to rats resulted in significantly decreased levels of serum alanine aminotransferase, aspartate aminotransferase, and albumin, which is indicative of hepatocellular damage, compared with the control group. DEN-induced oxidative stress was inhibited by NLE and this inhibition was paralleled by decreased lipid peroxides and increased glutathione transferase, superoxide dismutase, catalase, and glutathione peroxidase activity in liver tissues. The status of nonenzymatic antioxidants, such as reduced glutathione, was also found to be increased in NLE-administered rats. Furthermore, NLE decreased tumor size, hepatic Rac1, PKCα, and GSTπ expressions compared with the DEN-only group. Thus, supplementation of NLE reduced the adverse changes that occur because of liver cancer. These results prove that NLE protects against liver carcinogenesis induced because of treatment with DEN through blocking lipid peroxidation, hepatic cell damage, and enhancing the antioxidant defense system.


Assuntos
Antineoplásicos Fitogênicos/uso terapêutico , Carcinoma Hepatocelular/tratamento farmacológico , Dietilnitrosamina , Neoplasias Hepáticas/tratamento farmacológico , Nelumbo/química , Estresse Oxidativo/efeitos dos fármacos , Extratos Vegetais/uso terapêutico , Lesões Pré-Cancerosas/tratamento farmacológico , Alanina Transaminase/metabolismo , Animais , Antioxidantes/metabolismo , Aspartato Aminotransferases/metabolismo , Carcinoma Hepatocelular/induzido quimicamente , Carcinoma Hepatocelular/metabolismo , Carcinoma Hepatocelular/patologia , Catalase/metabolismo , Glutationa/metabolismo , Glutationa Transferase/metabolismo , Fígado/efeitos dos fármacos , Fígado/metabolismo , Neoplasias Hepáticas/induzido quimicamente , Neoplasias Hepáticas/metabolismo , Neoplasias Hepáticas/patologia , Masculino , Lesões Pré-Cancerosas/induzido quimicamente , Lesões Pré-Cancerosas/metabolismo , Lesões Pré-Cancerosas/patologia , Ratos Sprague-Dawley , Superóxido Dismutase/metabolismo
9.
Environ Toxicol ; 32(4): 1290-1304, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-27444805

RESUMO

Cell cycle regulation is an important issue in cancer therapy. Delphinidin and cyanidin are two major anthocyanins of the roselle plant (Hibiscus sabdariffa). In the present study, we investigated the effect of Hibiscus anthocyanins (HAs) on cell cycle arrest in human leukemia cell line HL-60 and the analyzed the underlying molecular mechanisms. HAs extracted from roselle calyces (purity 90%) markedly induced G2/M arrest evaluated with flow cytometry analysis. Western blot analyses revealed that HAs (0.1-0.7 mg mL-1 ) induced G2/M arrest via increasing Tyr15 phosphorylation of Cdc2, and inducing Cdk inhibitors p27 and p21. HAs also induced phosphorylation of upstream signals related to G2/M arrest such as phosphorylation of Cdc25C tyrosine phosphatase at Ser216, increasing the binding of pCdc25C with 14-3-3 protein. HAs-induced phosphorylation of Cdc25C could be activated by ATM checkpoint kinases, Chk1, and Chk2. We first time confirmed that ATM-Chk1/2-Cdc25C pathway as a critical mechanism for G2/M arrest in HAs-induced leukemia cell cycle arrest, indicating that this compound could be a promising anticancer candidate or chemopreventive agents for further investigation. © 2016 Wiley Periodicals, Inc. Environ Toxicol 32: 1290-1304, 2017.


Assuntos
Antocianinas/farmacologia , Pontos de Checagem da Fase G2 do Ciclo Celular/efeitos dos fármacos , Hibiscus/química , Pontos de Checagem da Fase M do Ciclo Celular/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Proteína Supressora de Tumor p53/genética , Proteínas 14-3-3/metabolismo , Antocianinas/química , Antocianinas/isolamento & purificação , Proteínas Mutadas de Ataxia Telangiectasia/metabolismo , Proteína Quinase CDC2/metabolismo , Sobrevivência Celular/efeitos dos fármacos , Quinase 1 do Ponto de Checagem/metabolismo , Quinase do Ponto de Checagem 2/metabolismo , Células HL-60 , Hibiscus/metabolismo , Humanos , Leucemia/metabolismo , Leucemia/patologia , Fosforilação/efeitos dos fármacos , Extratos Vegetais/química , Proteína Supressora de Tumor p53/deficiência , Fosfatases cdc25/metabolismo
10.
Histopathology ; 64(5): 713-21, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24117943

RESUMO

AIMS: In order to determine whether the expression of tumour-associated carbohydrate antigens (Tn/sTn) and a representative inflammation marker, nuclear factor-κB (NF-κB), is associated with the invasiveness of oral squamous cell carcinoma (OSCC), this study has attempted to investigate the correlation of the aforementioned markers with the well-established invasive pattern grading score (IPGS) and clinicopathological parameters. METHODS AND RESULTS: Specimens from 143 OSCC patients with classified clinicopathological parameters and IPGS were stained immunohistochemically using anti-Tn, sTn and NF-κB antibodies. Our results showed that the expression of both Tn and NF-κB was correlated positively with staging (P = 0.036; P = 0.015), recurrence (P < 0.001; P < 0.001) and distant metastasis (P = 0.005; P = 0.009), as well as with IPGS, while the expression of sTn was correlated inversely. In addition, poor survival was associated with overexpression of Tn and NF-κB but not with expression of sTn. CONCLUSIONS: Our results indicate that a reciprocal relationship between Tn and sTn expression may serve as a reliable indicator for OSCC prognostic evaluation. In addition, expression of Tn rather than sTn may play an important role in deeply invasive OSCC via regulation of NF-κB signalling.


Assuntos
Antígenos Glicosídicos Associados a Tumores/metabolismo , Carcinoma de Células Escamosas/metabolismo , Carcinoma de Células Escamosas/patologia , Neoplasias Bucais/metabolismo , Neoplasias Bucais/patologia , NF-kappa B/metabolismo , Feminino , Humanos , Imuno-Histoquímica , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Invasividade Neoplásica , Prognóstico , Transdução de Sinais
11.
J Pathol ; 231(2): 180-9, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23775566

RESUMO

Head and neck squamous cell carcinoma (HNSCC) is one of the leading causes of cancer-related death worldwide. The prognosis of HNSCC is usually poor because of its propensity for extensive invasion, local recurrence and frequent regional lymph node metastasis, even at initial diagnosis. Carcinoma-associated fibroblasts (CAFs), a major type of tumour-surrounding stromal cell, generate mediators through which they interact with tumours and contribute to cancer progression. The orchestration between CAFs and cancer cells is complex. Despite recent studies demonstrating the paracrine effect of stromal cells in the tumour microenvironment on initiation and progression of cancer cells, the major mediator related to CAFs and its underlying mechanism remain unknown. In the present study, we used organotypic culture to investigate CAFs that promote aggressive behaviour of HNSCC cells. Using microarray analysis, we detected abundant expression of interleukin-33 (IL-33) in CAFs and identified IL-33 as a critical mediator in CAF-induced invasiveness. Counteracting IL-33 activity diminished the aggressive phenotype of cancer cells induced by CAFs. Administration of IL-33 promoted cancer cell migration and invasion through induction of epithelial-to-mesenchymal transdifferentiation and increased IL-33 gene expression in cancer cells. In 40 patients with HNSCC, IL-33 expression in CAFs correlated with IL-33 expression in cancer cells. Most cases with a low invasion pattern grading score (IPGS) showed low or no expression of IL-33, whereas most HNSCC cases with high IPGS displayed over-expression of IL-33 in CAFs and cancer cells. High IL-33 expression associated with poor prognosis in terms of nodal metastasis-free survival. These results indicate that CAFs promote cancer invasiveness via paracrine and autocrine effects on microenvironmental IL-33 signalling, and suggest that IL-33 is a potential prognostic biomarker that could be considered in therapeutic strategies for the treatment of patients with HNSCC.


Assuntos
Carcinoma de Células Escamosas/metabolismo , Carcinoma de Células Escamosas/patologia , Fibroblastos/metabolismo , Neoplasias de Cabeça e Pescoço/metabolismo , Neoplasias de Cabeça e Pescoço/patologia , Interleucinas/metabolismo , Comunicação Parácrina/fisiologia , Western Blotting , Carcinoma de Células Escamosas/mortalidade , Linhagem Celular Tumoral , Ensaio de Imunoadsorção Enzimática , Neoplasias de Cabeça e Pescoço/mortalidade , Humanos , Imuno-Histoquímica , Interleucina-33 , Estimativa de Kaplan-Meier , Invasividade Neoplásica , Análise de Sequência com Séries de Oligonucleotídeos , Prognóstico , Reação em Cadeia da Polimerase em Tempo Real , Carcinoma de Células Escamosas de Cabeça e Pescoço , Microambiente Tumoral/fisiologia
12.
Cell Transplant ; 33: 9636897241248956, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38715279

RESUMO

Heart failure remains the leading cause of human death worldwide. After a heart attack, the formation of scar tissue due to the massive death of cardiomyocytes leads to heart failure and sudden death in most cases. In addition, the regenerative ability of the adult heart is limited after injury, partly due to cell-cycle arrest in cardiomyocytes. In the current post-COVID-19 era, urgently authorized modified mRNA (modRNA) vaccines have been widely used to prevent severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Therefore, modRNA-based protein replacement may act as an alternative strategy for improving heart disease. It is a safe, effective, transient, low-immunogenic, and integration-free strategy for in vivo protein expression, in addition to recombinant protein and stem-cell regenerative therapies. In this review, we provide a summary of various cardiac factors that have been utilized with the modRNA method to enhance cardiovascular regeneration, cardiomyocyte proliferation, fibrosis inhibition, and apoptosis inhibition. We further discuss other cardiac factors, modRNA delivery methods, and injection methods using the modRNA approach to explore their application potential in heart disease. Factors for promoting cardiomyocyte proliferation such as a cocktail of three genes comprising FoxM1, Id1, and Jnk3-shRNA (FIJs), gp130, and melatonin have potential to be applied in the modRNA approach. We also discuss the current challenges with respect to modRNA-based cardiac regenerative medicine that need to be overcome to apply this approach to heart disease. This review provides a short description for investigators interested in the development of alternative cardiac regenerative medicines using the modRNA platform.


Assuntos
Miócitos Cardíacos , RNA Mensageiro , Regeneração , Humanos , COVID-19/terapia , Insuficiência Cardíaca/terapia , Miócitos Cardíacos/metabolismo , Miócitos Cardíacos/citologia , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , SARS-CoV-2/genética
13.
J Tradit Complement Med ; 14(3): 266-275, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38707917

RESUMO

Mulberry leaf has been recognized as a traditional Chinese medicinal plant, which was distributed throughout the Asia. The aqueous extract of mulberry leaf extract (MLE) has various biologically active components such as polyphenols and flavonoids. However, the inhibitory effect of MLE in hepatocarcinogenesis is poorly understood. In this study, we determined the role of MLE supplementation in preventing hepatocarcinogenesis in a carcinogen-initiated high-fat diet (HFD)-promoted Sprague-Dawley (SD) rat model. The rats were fed an HFD to induce obesity and spontaneous hepatomas by administering 0.01% diethylnitrosamine (DEN) in their drinking water for 12 weeks (HD group), and also to fed MLE through oral ingestion at daily doses of 0.5%, 1%, or 2%. At the end of the 12-week experimental period, the liver tumors were analyzed to identify markers of oxidative stress and antioxidant enzyme activities, and their serum was analyzed to determine their nutritional status and liver function. Histopathological analysis revealed that MLE supplementation significantly suppressed the severity and incidence of hepatic tumors. Furthermore, compared with the HFD + DEN groups, the expression of protein kinase C (PKC)-α and Rac family small GTPase 1 (Rac1) was lower in the MLE groups. These findings suggest that MLE prevents obesity-enhanced, carcinogen-induced hepatocellular carcinoma development, potentially through the protein kinase C (PKC)α/Rac1 signaling pathway. MLE might be an effective chemoprevention modality for nonalcoholic fatty liver disease (NAFLD)/nonalcoholic steatohepatitis (NASH)-related hepatocarcinogenesis.

14.
Anticancer Res ; 44(5): 1963-1971, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38677769

RESUMO

BACKGROUND/AIM: Cancer cachexia is a wasting syndrome that has a devastating impact on the prognosis of patients with cancer. It is well-documented that pro-inflammatory cytokines are involved in the progression of this disorder. Therefore, this study was conducted to investigate the protective effect of taurine, an essential nonprotein amino acid with great anti-inflammatory properties, in attenuating muscle atrophy induced by cancer. MATERIALS AND METHODS: Conditioned media (CM) derived from T24 human bladder carcinoma cells with or without 5 mM taurine were incubated with human skeletal muscle cells (HSkMCs) and their differentiation was examined. The intracellular reactive oxygen species (ROS), morphology, and the catabolic pathway were monitored. RESULTS: T24-derived CM with high levels of TNF-α and IL-6 caused aberrant ROS accumulation and formation of atrophic myotubes by HSkMCs. In T24 cancer cells, taurine significantly inhibited the production of TNF-α and IL-6. In HSkMCs, taurine increased ROS clearance during differentiation and preserved the myotube differentiation ability impaired by the inflammatory tumor microenvironment. In addition, taurine ameliorated myotube atrophy by regulating the Akt/FoxO1/MuRF1 and MAFbx signaling pathways. CONCLUSION: Taurine rescues cancer-induced atrophy in human skeletal muscle cells by ameliorating the inflammatory tumor microenvironment. Taurine supplementation may be a promising approach for intervening with the progression of cancer cachexia.


Assuntos
Atrofia Muscular , Espécies Reativas de Oxigênio , Taurina , Microambiente Tumoral , Humanos , Taurina/farmacologia , Microambiente Tumoral/efeitos dos fármacos , Atrofia Muscular/patologia , Atrofia Muscular/tratamento farmacológico , Atrofia Muscular/metabolismo , Atrofia Muscular/etiologia , Espécies Reativas de Oxigênio/metabolismo , Linhagem Celular Tumoral , Fibras Musculares Esqueléticas/efeitos dos fármacos , Fibras Musculares Esqueléticas/metabolismo , Fibras Musculares Esqueléticas/patologia , Diferenciação Celular/efeitos dos fármacos , Músculo Esquelético/metabolismo , Músculo Esquelético/patologia , Músculo Esquelético/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Caquexia/tratamento farmacológico , Caquexia/patologia , Caquexia/metabolismo , Caquexia/etiologia , Neoplasias da Bexiga Urinária/patologia , Neoplasias da Bexiga Urinária/tratamento farmacológico , Neoplasias da Bexiga Urinária/metabolismo , Meios de Cultivo Condicionados/farmacologia , Inflamação/tratamento farmacológico , Inflamação/patologia , Inflamação/metabolismo , Fator de Necrose Tumoral alfa/metabolismo , Interleucina-6/metabolismo
15.
Nat Genet ; 56(3): 431-441, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-38413725

RESUMO

Spatial omics data are clustered to define both cell types and tissue domains. We present Building Aggregates with a Neighborhood Kernel and Spatial Yardstick (BANKSY), an algorithm that unifies these two spatial clustering problems by embedding cells in a product space of their own and the local neighborhood transcriptome, representing cell state and microenvironment, respectively. BANKSY's spatial feature augmentation strategy improved performance on both tasks when tested on diverse RNA (imaging, sequencing) and protein (imaging) datasets. BANKSY revealed unexpected niche-dependent cell states in the mouse brain and outperformed competing methods on domain segmentation and cell typing benchmarks. BANKSY can also be used for quality control of spatial transcriptomics data and for spatially aware batch effect correction. Importantly, it is substantially faster and more scalable than existing methods, enabling the processing of millions of cell datasets. In summary, BANKSY provides an accurate, biologically motivated, scalable and versatile framework for analyzing spatially resolved omics data.


Assuntos
Algoritmos , Benchmarking , Animais , Camundongos , Perfilação da Expressão Gênica , RNA , Transcriptoma , Análise de Dados
16.
Opt Express ; 21(15): 17760-8, 2013 Jul 29.
Artigo em Inglês | MEDLINE | ID: mdl-23938649

RESUMO

The unique physical effect-Kovacs effect is explored to enhance the performance of EO modulators by employing the non-thermal equilibrium state nanodisordered KTN crystals created by super-cooling process, which can have a significant 3.5 fold increase in quadratic electro-optic coefficient. This enables to reduce the switching half wave voltage (almost by half) so that a broadband (~GHz range) and large field of view (+/-30 deg) electro-optic modulator can be realized with much lowered driving power, which can be very useful for a variety of applications: laser Q-switches, laser pulse shaping, high speed optical shutters and modulating retro reflectors.


Assuntos
Lasers , Lentes , Sistemas Microeletromecânicos/instrumentação , Modelos Teóricos , Refratometria/instrumentação , Ressonância de Plasmônio de Superfície/instrumentação , Telecomunicações/instrumentação , Simulação por Computador , Desenho Assistido por Computador , Desenho de Equipamento , Análise de Falha de Equipamento , Luz , Espalhamento de Radiação
17.
Opt Lett ; 38(22): 4574-7, 2013 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-24322077

RESUMO

The electro-optic (EO) effect in nanodisordered potassium tantalate niobate (KTN) crystal is quantitatively investigated. It is found out that the EO coefficient of nanodisordered KTN crystal depends not only on the cooling temperature but also on the cooling rate. A larger EO coefficient can be obtained by employing a faster cooling rate. A Kerr EO efficient (s(11) - s(12) = 6.94 × 10(-14) m(2)/V(2)) is obtained at a cooling rate of 0.45 °C/s. The enhanced EO efficient by employing a faster cooling rate will be greatly beneficial for a variety of applications such as laser Q switches, laser pulse shaping, high-speed optical shutters, and modulating retroreflectors.


Assuntos
Nanopartículas/química , Nióbio/química , Óxidos/química , Potássio/química , Refratometria/métodos , Tantálio/química , Cristalização , Campos Eletromagnéticos , Luz , Teste de Materiais
18.
Anticancer Res ; 43(9): 4015-4022, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37648299

RESUMO

BACKGROUND/AIM: Cisplatin is a drug for treating oral cancer. However, several previous studies indicate that oral cancer cells can develop resistance to cisplatin, which may result in a poor prognosis for patients with oral cancer. Fucoidan, a natural health product extracted from brown seaweed, has anticancer abilities against various types of cancer cell. This study evaluated whether fucoidan can enhance the sensitivity of oral cancer cells to cisplatin and explored the underlying mechanism. MATERIALS AND METHODS: SCC-25 cells were used in the present study and treated with 0.3125 mg/ml fucoidan, 12.5 µg/ml cisplatin, or 0.3125 mg/ml fucoidan plus 12.5 µg/ml cisplatin for 48 h, 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, enzyme-linked immunosorbent, and immunoblotting assays were performed to evaluate cell survival, cytokeratin-18 fragment release, and expression of markers of apoptosis and autophagy, respectively. RESULTS: Cotreatment with fucoidan enhanced cisplatin-induced reduction of SCC-25 cell survival compared to cisplatin alone. In addition, cotreatment also increased the expression of apoptosis markers, including activated caspase-8, activated caspase-9, activated caspase-3, and cleaved poly(ADP-ribose) polymerase (PARP), but did not increase the expression of the two autophagy markers studied, beclin and autophagy-related 12-autophagy-related 5 conjugate. Fucoidan significantly inhibited cisplatin-induced AKT serine/threonine kinase 1 activation, which promoted PARP cleavage, caspase-3 activation, and cytokeratin-18 fragment expression in SCC-25 cells. CONCLUSION: Fucoidan promoted cisplatin-induced effects by inhibiting phosphatidylinositol 4,5 bisphosphate 3 kinase/AKT serine/threonine kinase 1 activation induced by cisplatin. The results of this study may provide a basis for the possible application of the combination of fucoidan and cisplatin in the clinical treatment of oral cancer in the future to improve the prognosis of patients with oral cancer.


Assuntos
Cisplatino , Neoplasias Bucais , Humanos , Caspase 3 , Cisplatino/farmacologia , Queratina-18 , Fosfatidilinositol 3-Quinases , Proteínas Proto-Oncogênicas c-akt , Inibidores de Poli(ADP-Ribose) Polimerases , Neoplasias Bucais/tratamento farmacológico , Serina
19.
Anticancer Res ; 43(6): 2583-2591, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-37247927

RESUMO

BACKGROUND/AIM: Although clinical medicine has significantly progressed in treating nasopharyngeal carcinoma (NPC) in recent years, many patients still have poor prognoses due to distant metastasis. It is still relatively unclear why NPC has a highly metastatic ability. Especially whether the tumor microenvironment affects the invasion and metastasis of NPC still needs to be cleared. In this study, serum starvation was used to simulate nutrient deficiency in the tumor microenvironment to explore whether nutrient deficiency affects the malignancy of NPC cells. MATERIALS AND METHODS: Semiquantitative reverse transcription-polymerase chain reaction, ELISA, immunoblotting assay, reporter gene assay, and Matrigel invasion assay were carried out. RESULTS: Under serum starvation, NPC cells could induce the mRNA expression and protein secretion of matrix metalloproteinase 9 (MMP9). The ERK-AP1 pathway was activated under serum starvation in NPC cells, resulting in the expression of MMP9. In contrast, treatment with an MMP9 inhibitor or an MMP9 siRNA inhibited serum starvation-induced invasion. CONCLUSION: Serum starvation could up-regulate MMP9 expression in NPC cells, contributing to NPC invasion. Therefore, serum starvation may promote malignancy of NPC cells but also support MMP9 as a potential therapeutic target to prevent NPC cell invasion and metastasis.


Assuntos
Metaloproteinase 9 da Matriz , Neoplasias Nasofaríngeas , Humanos , Carcinoma Nasofaríngeo/genética , Metaloproteinase 9 da Matriz/metabolismo , Neoplasias Nasofaríngeas/patologia , Sistema de Sinalização das MAP Quinases , RNA Interferente Pequeno/metabolismo , Linhagem Celular Tumoral , Movimento Celular , Invasividade Neoplásica/patologia , Regulação Neoplásica da Expressão Gênica , Microambiente Tumoral
20.
Nutrients ; 15(18)2023 Sep 14.
Artigo em Inglês | MEDLINE | ID: mdl-37764756

RESUMO

Apoptosis, a programmed cell death process preventing cancer development, can be evaded by cancer cells. AMP-activated protein kinase (AMPK) regulates energy levels and is a key research topic in cancer prevention and treatment. Some bioactive components of Hibiscus sabdariffa L. (HAs), including anthocyanins, have potential anticancer properties. Our study investigated the in vitro cytotoxic potential and mode of action of HAs extracts containing anthocyanins in colorectal cancer cells. The results showed that Hibiscus anthocyanin-rich extracts induced apoptosis in human colorectal cancer cells through the activation of multiple signaling pathways of AMPK. We observed the dose-response and time-dependent induction of apoptosis with HAs. Subsequently, the activation of Fas-mediated proteins triggered apoptotic pathways associated with Fas-mediated apoptosis-related proteins, including caspase-8/tBid. This caused the release of cytochrome C from the mitochondria, resulting in caspase-3 cleavage and apoptosis activation in intestinal cancer cells. These data elucidate the relationship between Has' regulation of apoptosis-related proteins in colorectal cancer cells and apoptotic pathways.

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