Assuntos
Proliferação de Células/efeitos dos fármacos , Ciclina D/genética , Terapia de Alvo Molecular , Neoplasias/tratamento farmacológico , Ciclina D/antagonistas & inibidores , Quinase 4 Dependente de Ciclina/genética , Quinase 6 Dependente de Ciclina/genética , Humanos , Complexos Multiproteicos/antagonistas & inibidores , Neoplasias/genética , Neoplasias/patologiaRESUMO
BACKGROUND/AIM: This study was designed to investigate the effect of IL-39 on T24 bladder cancer (BC) cell line survival and growth. MATERIALS AND METHODS: In order to assess the direct effect of IL-39 on survival, proliferation, and apoptosis of T24 BC cells, we utilized a clonogenic survival assay, a cell proliferation assay, and caspase-3 activity kits. Potential proliferative and apoptotic molecular mechanisms were evaluated by RT-PCR. RESULTS: Treatment of T24 BC cells with IL-39 resulted in a significant reduction in the percentage of colonies. The anti-tumor effect of IL-39 on T24 bladder cancer cells correlated strongly with a decrease in cyclin E, in combination with an increase in the mRNA levels of Fas. CONCLUSION: IL-39 impedes the growth and survival of T24 BC cells by inhibiting growth and promoting apoptosis. This ability to modulate gene transcription in neoplastic cells shows promise and warrants further research in immunotherapy.
Assuntos
Apoptose/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Ciclina E/metabolismo , Interleucinas/farmacologia , Receptor fas/metabolismo , Apoptose/genética , Proteínas Reguladoras de Apoptose/genética , Proteínas Reguladoras de Apoptose/metabolismo , Linhagem Celular Tumoral , Proliferação de Células/genética , Sobrevivência Celular/efeitos dos fármacos , Sobrevivência Celular/genética , Ciclina D/genética , Ciclina D/metabolismo , Ciclina E/genética , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Receptor fas/genéticaRESUMO
Abnormal activity of the core cell-cycle machinery is seen in essentially all tumor types and represents a driving force of tumorigenesis. Recent studies revealed that cell-cycle proteins regulate a wide range of cellular functions, in addition to promoting cell division. With the clinical success of CDK4/6 inhibitors, it is becoming increasingly clear that targeting individual cell-cycle components may represent an effective anti-cancer strategy. Here, we discuss the potential of inhibiting different cell-cycle proteins for cancer therapy.
Assuntos
Antineoplásicos/farmacologia , Neoplasias/tratamento farmacológico , Neoplasias/patologia , Animais , Ciclo Celular/efeitos dos fármacos , Ciclo Celular/fisiologia , Ciclina D/genética , Ciclina D/metabolismo , Ciclina E/genética , Ciclina E/metabolismo , Quinase 4 Dependente de Ciclina/antagonistas & inibidores , Quinase 4 Dependente de Ciclina/metabolismo , Quinase 6 Dependente de Ciclina/antagonistas & inibidores , Quinase 6 Dependente de Ciclina/metabolismo , Humanos , Camundongos , Terapia de Alvo Molecular/métodosRESUMO
Cyclins are key regulators of cell cycle progression and survival. Particularly cyclins D (cyclin D1, D2, and D3) act in response to the mitogenic stimulation and are pivotal mediators between proliferative pathways and the nuclear cell cycle machinery. Dysregulation of cyclins expression results in impaired development, abnormal cell growth or tumorigenesis. In this review we summarize current knowledge about regulatory role of the cyclin D promoters, transcriptional factors: regulators, co-activators and adaptor proteins necessary to their activation. We focused on the intracellular signaling pathways vital to cell growth, differentiation and apoptosis including transcription factor families: activator protein 1 (AP1), nuclear factor (NFκB), signal transducer and activator of transcription (STAT), cAMP response element-binding protein (CREB) and Sp/NF-Y, with a special insight into the tissue specific cyclin representation.
Assuntos
Ciclina D/genética , Regulação Neoplásica da Expressão Gênica , Neoplasias/genética , Animais , Apoptose/genética , Carcinogênese/genética , Diferenciação Celular/genética , Divisão Celular/genética , Ciclina D/metabolismo , Modelos Animais de Doenças , Humanos , Camundongos , Neoplasias/mortalidade , Neoplasias/patologia , Prognóstico , Regiões Promotoras Genéticas/genética , Transdução de Sinais/genética , Fatores de Transcrição/metabolismoRESUMO
BACKGROUNDAlthough CDK4/6 inhibitors are an established treatment for hormone receptor-positive, HER2-negative metastatic breast cancers, their benefit in other malignancies remains limited.METHODSWe investigated factors associated with clinical outcomes from CDK4/6 inhibitor-based therapy among patients with G1/S phase cell-cycle alterations (CDK4/6 amplifications, CCND1/2/3 amplifications, or CDKN2A/B alterations).RESULTSOverall, 2457 patients with diverse solid tumors that underwent clinical-grade, next-generation sequencing (182-465 genes) and therapy outcome of (non-breast cancer) patients treated with matched CDK4/6 inhibitors were analyzed. G1/S phase cell-cycle alterations occurred in 20.6% (507 of 2457) of patients; 99% of those patients (n = 501) harbored ≥1 characterized co-alteration (median, 4; range, 0-24). In 40 patients with G1/S phase cell-cycle alterations given CDK4/6 inhibitors as part of their regimen, significantly longer median progression-free survival (PFS) was observed when CDK4/6 inhibitor-based therapies matched a larger proportion of tumor alterations, often because CDK4/6 inhibitors were administered together with other drugs that were matched to genomic co-alterations, hence achieving a high matching score (high vs. low [≥50% vs. <50%] matching score, PFS, 6.2 vs. 2.0 months, P < 0.001 [n = 40] [multivariate]) and higher rate of stable disease ≥6 months or an objective response (57% vs. 21%, P = 0.048).CONCLUSIONIn summary, in cell-cycle-altered cancers, matched CDK4/6 inhibitors, as part of an individualized regimen targeting a majority of genomic alterations, was independently associated with longer PFS.TRIAL REGISTRATIONClinicalTrials.gov NCT02478931.FUNDINGJoan and Irwin Jacobs Fund, National Cancer Institute (P30 CA023100, R01 CA226803), and the FDA (R01 FD006334).
Assuntos
Quinase 4 Dependente de Ciclina/antagonistas & inibidores , Quinase 6 Dependente de Ciclina/antagonistas & inibidores , Pontos de Checagem da Fase G1 do Ciclo Celular/efeitos dos fármacos , Pontos de Checagem da Fase G1 do Ciclo Celular/genética , Neoplasias/tratamento farmacológico , Neoplasias/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Ciclina D/genética , Quinase 4 Dependente de Ciclina/genética , Quinase 6 Dependente de Ciclina/genética , Inibidor de Quinase Dependente de Ciclina p15/genética , Inibidor p16 de Quinase Dependente de Ciclina/genética , Feminino , Genes p16 , Humanos , Sistema de Sinalização das MAP Quinases/genética , Masculino , Pessoa de Meia-Idade , Neoplasias/patologia , Fosfatidilinositol 3-Quinases/genética , Intervalo Livre de Progressão , Inibidores de Proteínas Quinases/uso terapêutico , Adulto JovemRESUMO
A comprehensive molecular mechanistic role of lutein on adipogenesis is not well understood. The present study focused to evaluate the effect of lutein at the early and late phase of adipocyte differentiation in vitro using a 3T3-L1 cell model. The effect of purified carotenoid on the viability of normal and differentiated 3T3-L1 cells was analyzed by WST-1 assay. Oil Red O and Nile red staining were employed to observe lipid droplets in mature adipocytes. The effect of lutein on gene and protein expression of major transcription factors and adipogenic markers was analyzed by RT-PCR and western blotting, respectively. The role of lutein on mitotic clonal expansion was analyzed by flow cytometry. The results showed a significant reduction (p < 0.05) in the accumulation of lipid droplets in lutein-treated (5 µM) cells. Inhibition in lipid accumulation was associated with down-regulated expression of CEBP-α and PPAR-γ at gene and protein levels. Subsequently, lutein repressed gene expression of FAS, FABP4, and SCD1 in mature adipocytes. Interestingly, it blocks the protein expression of CEBP-α and PPAR-γ in the initial stages of adipocyte differentiation. This early-stage inhibition of adipocyte differentiation is linked with repressed phosphorylation AKT and ERK. Further, upregulated cyclin D and down-regulated CDK4 and CDK2 in lutein treated adipocytes enumerate its role in delaying the cell cycle progression at the G0/G1 phase. Our results emphasize that adipogenesis inhibitory efficacy of lutein is potentiated by halting early phase regulators of adipocyte differentiation, which strengthens the competency of lutein besides its inevitable presence in the human body.
Assuntos
Adipócitos/efeitos dos fármacos , Adipogenia/efeitos dos fármacos , Proteínas Estimuladoras de Ligação a CCAAT/genética , Diferenciação Celular/efeitos dos fármacos , Luteína/farmacologia , PPAR gama/genética , Células 3T3-L1 , Adipócitos/citologia , Adipócitos/metabolismo , Adipogenia/genética , Animais , Proteínas Estimuladoras de Ligação a CCAAT/antagonistas & inibidores , Proteínas Estimuladoras de Ligação a CCAAT/metabolismo , Ciclina D/genética , Ciclina D/metabolismo , Quinase 2 Dependente de Ciclina/genética , Quinase 2 Dependente de Ciclina/metabolismo , Quinase 4 Dependente de Ciclina/genética , Quinase 4 Dependente de Ciclina/metabolismo , Dexametasona/farmacologia , Proteínas de Ligação a Ácido Graxo/genética , Proteínas de Ligação a Ácido Graxo/metabolismo , Pontos de Checagem da Fase G1 do Ciclo Celular/efeitos dos fármacos , Pontos de Checagem da Fase G1 do Ciclo Celular/genética , Regulação da Expressão Gênica , Camundongos , PPAR gama/antagonistas & inibidores , PPAR gama/metabolismo , Proteínas Proto-Oncogênicas c-akt/genética , Proteínas Proto-Oncogênicas c-akt/metabolismo , Fase de Repouso do Ciclo Celular/efeitos dos fármacos , Fase de Repouso do Ciclo Celular/genética , Transdução de Sinais , Estearoil-CoA Dessaturase/genética , Estearoil-CoA Dessaturase/metabolismo , Receptor fas/genética , Receptor fas/metabolismoRESUMO
Histone acetylation plays an important role in plant growth and development. Here, we investigated the effect of sodium butyrate (NaB), a histone deacetylase inhibitor, on adventitious shoot formation from protoplast-derived calli and cotyledon explants of tobacco (Nicotiana benthamiana) and tomato (Solanum lycopersicum). The frequency of adventitious shoot formation from protoplast-derived calli was higher in shoot induction medium (SIM) containing NaB than in the control. However, the frequency of adventitious shoot formation from cotyledon explants of tobacco under the 0.1 mM NaB treatment was similar to that in the control, but it decreased with increasing NaB concentration. Unlike in tobacco, NaB decreased adventitious shoot formation in tomato explants in a concentration-dependent manner, but it did not have any effect on adventitious shoot formation in calli. NaB inhibited or delayed the expression of D-type cyclin (CYCD3-1) and shoot-regeneration regulatory gene WUSCHEL (WUS) in cotyledon explants of tobacco and tomato. However, compared to that in control SIM, the expression of WUS was promoted more rapidly in tobacco calli cultured in NaB-containing SIM, but the expression of CYCD3-1 was inhibited. In conclusion, the effect of NaB on adventitious shoot formation and expression of CYCD3-1 and WUS genes depended on the plant species and whether the effects were tested on explants or protoplast-derived calli.
Assuntos
Ácido Butírico/farmacologia , Nicotiana/efeitos dos fármacos , Nicotiana/crescimento & desenvolvimento , Solanum lycopersicum/efeitos dos fármacos , Solanum lycopersicum/crescimento & desenvolvimento , Cotilédone/efeitos dos fármacos , Cotilédone/genética , Cotilédone/crescimento & desenvolvimento , Ciclina D/genética , Regulação da Expressão Gênica de Plantas/efeitos dos fármacos , Genes de Plantas/efeitos dos fármacos , Inibidores de Histona Desacetilases/farmacologia , Solanum lycopersicum/genética , Proteínas de Plantas/genética , Brotos de Planta/efeitos dos fármacos , Brotos de Planta/genética , Brotos de Planta/crescimento & desenvolvimento , Especificidade da Espécie , Nicotiana/genéticaRESUMO
In addition to commonly associated environmental factors, genomic factors may cause cerebral palsy. We performed whole-exome sequencing of 250 parent-offspring trios, and observed enrichment of damaging de novo mutations in cerebral palsy cases. Eight genes had multiple damaging de novo mutations; of these, two (TUBA1A and CTNNB1) met genome-wide significance. We identified two novel monogenic etiologies, FBXO31 and RHOB, and showed that the RHOB mutation enhances active-state Rho effector binding while the FBXO31 mutation diminishes cyclin D levels. Candidate cerebral palsy risk genes overlapped with neurodevelopmental disorder genes. Network analyses identified enrichment of Rho GTPase, extracellular matrix, focal adhesion and cytoskeleton pathways. Cerebral palsy risk genes in enriched pathways were shown to regulate neuromotor function in a Drosophila reverse genetics screen. We estimate that 14% of cases could be attributed to an excess of damaging de novo or recessive variants. These findings provide evidence for genetically mediated dysregulation of early neuronal connectivity in cerebral palsy.
Assuntos
Paralisia Cerebral/genética , Proteínas F-Box/genética , Tubulina (Proteína)/genética , Proteínas Supressoras de Tumor/genética , beta Catenina/genética , Animais , Paralisia Cerebral/patologia , Ciclina D/genética , Citoesqueleto/genética , Drosophila/genética , Exoma/genética , Matriz Extracelular/genética , Feminino , Adesões Focais/genética , Predisposição Genética para Doença , Genoma Humano/genética , Humanos , Masculino , Mutação/genética , Neuritos/metabolismo , Neuritos/patologia , Fatores de Risco , Análise de Sequência de DNA , Transdução de Sinais/genética , Sequenciamento do Exoma , Proteína rhoB de Ligação ao GTP/genéticaRESUMO
The molecular heterogeneity of renal cell carcinoma (RCC) complicates the therapeutic interventions for advanced metastatic disease and thus its management remains a significant challenge. This study investigates the role of the lncRNA CDKN2B-AS1 and miR-141-3p interactions in the progression and metastasis of kidney cancer. Human renal cancer cell lines (ACHN and Caki1), normal RPTEC cells, tissue cohorts, and a series of in vitro assays and in vivo mouse model were used for this study. An overexpression of CDKN2B-AS1 was observed in RCC compared to normal samples in TCGA and our in-house SFVAMC tissue cohorts. Reciprocally, we observed reduced expression of miR-141 in RCC compared to normal in the same cohorts. CDKN2B-AS1 shares regulatory miR-141 binding sites with CCND1 and CCND2 genes. Direct interactions of CDKN2B-AS1/miR-141/Cyclin D1-D2 were confirmed by RNA immunoprecipitation and luciferase reporter assays indicating that CDKN2B-AS1/miR-141/Cyclin D1-D2 acts as a ceRNA network in RCC. Functionally, attenuation of CDKN2B-AS1 and/or overexpression of miR-141 inhibited proliferation, clonogenicity, migration/invasion, induced apoptosis in vitro and suppressed tumor growth in xenograft mouse model. Further, overexpression of CDKN2B-AS1 is positively correlated with poor overall survival of RCC patients. Expression of miR-141 also robustly discriminated malignant from non-malignant tissues and its inhibition in normal RPTEC cells induced pro-cancerous characteristics. CDKN2B-AS1 attenuation or miR-141 overexpression decreased CCND1/CCND2 expression, resulting in reduced RAC1/pPXN that are involved in migration, invasion and epithelial-mesenchymal transition. This study, for the first time, deciphered the role of CDKN2B-AS1/miR-141/Cyclin D axis in RCC and highlights this network as a promising therapeutic target for the regulation of EMT driven metastasis in RCC.
Assuntos
Carcinoma de Células Renais/genética , MicroRNAs/genética , RNA Longo não Codificante/genética , Animais , Apoptose/genética , Carcinogênese/genética , Carcinoma de Células Renais/metabolismo , Linhagem Celular Tumoral , Movimento Celular/genética , Proliferação de Células/genética , Ciclina D/genética , Ciclina D/metabolismo , Ciclina D1/genética , Ciclina D1/metabolismo , Ciclina D2/genética , Ciclina D2/metabolismo , Inibidor de Quinase Dependente de Ciclina p15/genética , Progressão da Doença , Transição Epitelial-Mesenquimal/genética , Feminino , Regulação Neoplásica da Expressão Gênica/genética , Humanos , Masculino , Camundongos , Camundongos Nus , MicroRNAs/metabolismo , Metástase Neoplásica/genética , RNA Longo não Codificante/metabolismo , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Bauhinia championii (Benth.) is one of the commonly used herbs in Taiwan. The stem of this plant has been used to treat epigastria pain and rheumatoid arthritis. However, the antitumor activities of this herb have never been reported. This study aims to investigate the mechanism of anticancer activity of the extracts from B. championii (BC). BC was fractionated with a series of organic solvents, including n-hexane (H), ethyl acetate (EA), 1-butanol (B), and water (W). We first investigated the effects of BC-H, BC-EA, BC-B and BC-W partitioned fraction on cell viability. In HCT 116 colon cancer cell lines, BC-EA showed the highest inhibition of cell viability and changed the morphology of cells. With dose- and time-dependent manners, BC-EA inhibited the proliferation of HCT 116 cells by inducing apoptosis and G0/G1 phase arrest of cell cycle. To determine the underlying mechanisms, down-regulated CDK2, Cyclin D, and Cyclin E and up-regulated p16, p21, and p53 may account for the cell cycle arrest, while the apoptotic effect of BC-EA may attribute to increased intracellular Ca2+, loss of mitochondria membrane potential (ΔΨm), increase of Bax, Bak, puma, and AIF, and decrease of Bcl-2. Furthermore, the inactivation of Ras signaling pathway by BC-EA also contributed to its apoptotic effect on HCT 116. Our study demonstrates that BC-EA not only inhibits cell growth but also induces apoptosis through inhibiting Ras signal pathway and increasing p53 expression levels. We suggest that BC-EA may be a new dietary supplement and a useful tool to search for therapeutic candidates against colon cancer.
Assuntos
Antineoplásicos Fitogênicos , Apoptose/efeitos dos fármacos , Bauhinia/química , Neoplasias do Colo/patologia , Interfase/efeitos dos fármacos , Extratos Vegetais/farmacologia , Apoptose/genética , Ciclina D/genética , Ciclina D/metabolismo , Quinase 2 Dependente de Ciclina/genética , Quinase 2 Dependente de Ciclina/metabolismo , Relação Dose-Resposta a Droga , Humanos , Interfase/genética , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Fatores de Tempo , Proteína Supressora de Tumor p53/genética , Proteína Supressora de Tumor p53/metabolismoRESUMO
Multicellular organisms use mitogens to regulate cell proliferation, but how fluctuating mitogenic signals are converted into proliferation-quiescence decisions is poorly understood. In this work, we combined live-cell imaging with temporally controlled perturbations to determine the time scale and mechanisms underlying this system in human cells. Contrary to the textbook model that cells sense mitogen availability only in the G1 cell cycle phase, we find that mitogenic signaling is temporally integrated throughout the entire mother cell cycle and that even a 1-hour lapse in mitogen signaling can influence cell proliferation more than 12 hours later. Protein translation rates serve as the integrator that proportionally converts mitogen history into corresponding levels of cyclin D in the G2 phase of the mother cell, which controls the proliferation-quiescence decision in daughter cells and thereby couples protein production with cell proliferation.
Assuntos
Proliferação de Células , Fase G1 , Fase G2 , Mitógenos/metabolismo , Células-Tronco/fisiologia , Ciclina D/genética , Ciclina D/metabolismo , Humanos , Quinases de Proteína Quinase Ativadas por Mitógeno/metabolismo , Biossíntese de Proteínas , Transdução de Sinais , Células-Tronco/metabolismoRESUMO
Intestinal stem cells (ISCs) play a crucial role in maintaining intestinal homeostasis upon chemotherapy and radiotherapy. It has been documented that prostaglandin E2 (PGE2) treatment improved hematopoietic stem cell function in vitro and in vivo, while the relationship between PGE2 and intestinal stem cells remains unclear. Presently, mice were exposed to PGE1, dmPGE2 and indomethacin. Numbers and function of ISCs were assessed by analyzing Olfm4+ ISCs. Intestinal protection of dmPGE2 was investigated on a 5-fluorouracil (5FU)-induced intestinal damage mouse model. The results showed that dmPGE2 treatment, but not PGE1, increased numbers of Olfm4+ ISCs in dose- and time-dependent manners. Indomethacin treatment decreased numbers of Olfm4+ ISCs. The beneficial effects of short-term dmPGE2 treatment on intestine were supported in a 5FU-induced intestinal damage model. Our data showed that 5FU treatment significantly decreased numbers of Olfm4+ ISCs and goblet cells in intestine, which could be ameliorated by dmPGE2 treatment. dmPGE2 treatment accelerated the recovery of 5FU-induced ISC injury via increasing expression of cyclin D1 and D2 in intestine. Furthermore, dmPGE2 treatment-induced expression of cyclin D1 and D2 might be mediated by up-regulation of FOXM1 expression in intestine. These findings feature PGE2 as an effective protector against chemotherapy-induced intestinal damage.
Assuntos
Ciclina D/metabolismo , Dinoprostona/farmacologia , Fluoruracila/farmacologia , Regulação da Expressão Gênica/efeitos dos fármacos , Mucosa Intestinal/efeitos dos fármacos , Células-Tronco/efeitos dos fármacos , Animais , Antimetabólitos Antineoplásicos/farmacologia , Apoptose , Proliferação de Células , Ciclina D/genética , Humanos , Mucosa Intestinal/lesões , Mucosa Intestinal/metabolismo , Mucosa Intestinal/patologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Ocitócicos/farmacologia , Células-Tronco/metabolismo , Células-Tronco/patologia , Células Tumorais CultivadasRESUMO
The progression of cancers and neurodegenerative disorders is largely defined by a set of molecular determinants that are either complementarily deregulated, or share remarkably overlapping functional pathways. A large number of such molecules have been demonstrated to be involved in the progression of both diseases. In this review, we particularly discuss our current knowledge on p53, cyclin D, cyclin E, cyclin F, Pin1 and protein phosphatase 2A, and their implications in the shared or distinct pathways that lead to cancers or neurodegenerative diseases. In addition, we focus on the inter-dependent regulation of brain cancers and neurodegeneration, mediated by intercellular communication between tumor and neuronal cells in the brain through the extracellular microenvironment. Finally, we shed light on the therapeutic perspectives for the treatment of both cancer and neurodegenerative disorders.
Assuntos
Encéfalo/metabolismo , Neoplasias/genética , Doenças Neurodegenerativas/genética , Microambiente Tumoral/genética , Encéfalo/patologia , Ciclina D/genética , Ciclina E/genética , Ciclinas/genética , Progressão da Doença , Humanos , Peptidilprolil Isomerase de Interação com NIMA/genética , Neoplasias/patologia , Doenças Neurodegenerativas/patologia , Proteína Fosfatase 2/genética , Proteína Supressora de Tumor p53/genéticaRESUMO
S-phase entry and exit are regulated by hundreds of protein complexes that assemble "just in time," orchestrated by a multitude of distinct events. To help understand their interplay, we have created a tailored visualization based on the Minardo layout, highlighting over 80 essential events. This complements our earlier visualization of M-phase, and both can be displayed together, giving a comprehensive overview of the events regulating the cell division cycle. To view this SnapShot, open or download the PDF.
Assuntos
Ciclo Celular/genética , Mitose/genética , Complexos Multiproteicos/genética , Fase S/genética , Divisão Celular/genética , Ciclina B/genética , Ciclina D/genética , Quinases Ciclina-Dependentes/genética , Fase G2/genética , Humanos , Fosforilação/genética , Complexo de Endopeptidases do Proteassoma/genéticaRESUMO
The imidazolium compound YM155, first discovered as a potent inhibitor of Survivin, effectively kills many carcinomas in preclinical models. However, the upstream signaling mechanism triggered by YM155 remains unclear. Here we studied early signaling responses in vitro in prostate and renal cancer cell lines in a dose-dependent manner. We found that YM155 rapidly activates the retinoblastoma protein, correlating with the loss of expression of all three Cyclin Ds. Using Western blot, various selective chemical inhibitors and q-PCR, we show that YM155-mediated decrease in protein levels of Cyclin Ds, Survivin and Mcl-1 is independent of transcription or proteasomal control mechanisms. Moreover, we provide the first evidence that YM155 changes the phosphorylation status of known mTOR-target proteins involved in translational control, namely ribosomal protein S6 (rS6) and 4E-BP1. Our data support that YM155 achieves this by blocking mTORC1 via the phosphorylation of Raptor at S792 through activated AMPKα (T172). Furthermore, we also used a polysome profile, supporting that YM155 markedly suppresses cap-dependent translation of mRNAs which include Survivin, Cyclin D1 and Mcl-1. We provide the first evidence that YM155 functions as a potent activator of AMPKα, a robust suppressor of mTORC1 and an attenuator of global protein synthesis.
Assuntos
Carcinoma/tratamento farmacológico , Imidazóis/farmacologia , Naftoquinonas/farmacologia , Neoplasias da Próstata/tratamento farmacológico , Proteínas Quinases/genética , Quinases Proteína-Quinases Ativadas por AMP , Proteínas Adaptadoras de Transdução de Sinal/genética , Apoptose/efeitos dos fármacos , Carcinoma/genética , Carcinoma/patologia , Proteínas de Ciclo Celular/genética , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Ciclina D/genética , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Masculino , Alvo Mecanístico do Complexo 1 de Rapamicina/genética , Próstata/efeitos dos fármacos , Neoplasias da Próstata/genética , Neoplasias da Próstata/patologia , Transdução de Sinais/efeitos dos fármacos , Survivina/genéticaRESUMO
Antisense long non-coding RNAs (AS lncRNAs) have increasingly been recognized as important regulators of gene expression and they have been found to play key roles in several diseases. However, very little is known about the role of AS lncRNAs in fibrotic diseases such as systemic sclerosis (SSc). Our recent screening experiments by RNA sequencing showed that ovarian tumor domain containing 6B antisense RNA1 (OTUD6B-AS1) and its sense gene OTUD6B were significantly downregulated in SSc skin biopsies. Therefore, we aimed to identify key regulators of OTUD6B-AS1 and to analyze the functional relevance of OTUD6B-AS1 in SSc. OTUD6B-AS1 and OTUD6B expression in SSc and healthy control (HC) dermal fibroblasts (Fb) after stimulation with transforming growth factor-ß (TGFß), Interleukin (IL)-4, IL-13, and platelet-derived growth factor (PDGF) was analyzed by qPCR. To identify the functional role of OTUD6B-AS1, dermal Fb or human pulmonary artery smooth muscle cells (HPASMC) were transfected with a locked nucleic acid antisense oligonucleotide (ASO) targeting OTUD6B-AS1. Proliferation was measured by BrdU and real-time proliferation assay. Apoptosis was measured by Caspase 3/7 assay and Western blot for cleaved caspase 3. While no difference was recorded at the basal level between HC and SSc dermal Fb, the expression of OTUD6B-AS1 and OTUD6B was significantly downregulated in both SSc and HC dermal Fb after PDGF stimulation in a time-dependent manner. Only mild and inconsistent effects were observed with TGFß, IL-4, and IL-13. OTUD6B-AS1 knockdown in Fb and HPASMC did not affect extracellular matrix or pro-fibrotic/proinflammatory cytokine production. However, OTUD6B-AS1 knockdown significantly increased Cyclin D1 expression at the mRNA and protein level. Moreover, silencing of OTUD6B-AS1 significantly reduced proliferation and suppressed apoptosis in both dermal Fb and HPASMC. OTUD6B-AS1 knockdown did not affect OTUD6B expression at the mRNA level and protein level. Our data suggest that OTUD6B-AS1 regulates proliferation and apoptosis via cyclin D1 expression in a sense gene independent manner. This is the first report investigating the function of OTUD6B-AS1. Our data shed light on a novel apoptosis resistance mechanism in Fb and vascular smooth muscle cells that might be relevant for pathogenesis of SSc.
Assuntos
Endopeptidases/metabolismo , Fibroblastos/fisiologia , Miócitos de Músculo Liso/fisiologia , RNA Antissenso/metabolismo , Pele/metabolismo , Apoptose , Proliferação de Células , Células Cultivadas , Ciclina D/genética , Ciclina D/metabolismo , Endopeptidases/genética , Retículo Endoplasmático Liso , Regulação da Expressão Gênica , Técnicas de Silenciamento de Genes , Humanos , RNA Antissenso/genética , RNA Longo não Codificante , Escleroderma Sistêmico , Pele/patologiaRESUMO
Transient receptor potential vanilloid type 4 (TRPV4) is a Ca2+-permeable cation channel that is known to be an osmosensor and thermosensor. Currently, limited evidence shows that TRPV4 plays opposite roles in either promoting or inhibiting cancer development in different cancer types. Furthermore, the precise biological functions and the underlying mechanisms of TRPV4 in carcinogenesis are still poorly understood. In this study, we demonstrated that TRPV4 is upregulated in colon cancer and associated with poor prognosis. Contrary to the reported cell death-promoting activity of TRPV4 in certain cancer cells, TRPV4 positively regulates cell survival in human colon cancer in vitro and in vivo. Inhibition of TRPV4 affects the cell cycle progression from the G1 to S phase through modulating the protein expression of D-type cyclins. Apoptosis and autophagy induced by TRPV4 silencing attenuate cell survival and potentiate the anticancer efficacy of chemotherapeutics against colon cancer cells. In addition, PTEN is activated by inhibition of TRPV4 as indicated by the dephosphorylation and increased nuclear localization. Knockdown of PTEN significantly abrogates TRPV4 silencing induced growth inhibition and recovers the capability of clonogenicity, as well as reduced apoptosis in colon cancer cells. Thus, PTEN regulates the antigrowth effects induced by TRPV4 inhibition through both phosphatase-dependent and independent mechanisms. In conclusion, inhibition of TRPV4 suppresses colon cancer development via activation of PTEN pathway. This finding suggests that downregulation of TPRV4 expression or activity would conceivably constitute a novel approach for the treatment of human colon cancer.
Assuntos
Apoptose/genética , Neoplasias do Colo/metabolismo , PTEN Fosfo-Hidrolase/metabolismo , Canais de Cátion TRPV/metabolismo , Animais , Autofagia/genética , Linhagem Celular Tumoral , Sobrevivência Celular/genética , Neoplasias do Colo/genética , Neoplasias do Colo/mortalidade , Ciclina D/genética , Ciclina D/metabolismo , Pontos de Checagem da Fase G1 do Ciclo Celular/genética , Humanos , Camundongos Nus , PTEN Fosfo-Hidrolase/genética , Prognóstico , Proteínas Proto-Oncogênicas c-akt/genética , Proteínas Proto-Oncogênicas c-akt/metabolismo , Transdução de Sinais/genética , Serina-Treonina Quinases TOR/genética , Serina-Treonina Quinases TOR/metabolismo , Canais de Cátion TRPV/antagonistas & inibidores , Canais de Cátion TRPV/genética , Transplante HeterólogoRESUMO
Hypoxia is a condition of low oxygen level which poses a common feature of most cancers. In the current study, we investigated effect of water containing oxygen nanobubble (ONB) on tumor growth in breast cancer 4T1-bearing mice during 14-day treatment period. Tumor-bearing mice were randomly divided into three groups (six mice per group), including the ONB group drinking water containing ONB, the air nanobubble (ANB) group drinking water containing ANB, and control group drinking normal water. Tumor weight and size were measured in 2-day interval during 14-day treatment. mRNA expression of p53, vascular endothelial growth factor (VEGF), hypoxia-inducible factor (HIF), and cyclin D/Cdk2 genes were measured in the treated and control mice. After 8, 12, and 14 days of treatment, tumor size in ONB group was significantly decreased by 40.5%, 32.8%, and 28%, respectively, when compared with the control group. In addition, ANB group showed a significant reduction in tumor burden as well. The messenger RNA (mRNA) level of p53 in tumor cells of ONB and ANB group was found to be 36-fold (P = 0.0001) and 33-fold (P = 0.0001) higher than that in the control group, respectively. There was a ninefold increase in mRNA expression of VEGF gene in tumor cells of ANB mice than that in control mice; however, there was no significant changes in ONB group. Expression of HIF gene was significantly lower in tumor cells of ONB and ANB group than in the control group. It is concluded that drinking ONB water has potential to inhibit tumor growth, however more preclinical and proof-of-concept studies are needed to confirm its safety and therapeutic effect.
Assuntos
Neoplasias da Mama/terapia , Subunidade alfa do Fator 1 Induzível por Hipóxia/genética , Neoplasias Mamárias Animais/terapia , Oxigênio/farmacologia , Animais , Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Ciclina D/genética , Quinase 2 Dependente de Ciclina/genética , Feminino , Peixes , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Humanos , Neoplasias Mamárias Animais/genética , Neoplasias Mamárias Animais/patologia , Camundongos , Oxigênio/química , RNA Mensageiro/genética , Hipóxia Tumoral/efeitos dos fármacos , Fator A de Crescimento do Endotélio Vascular/genética , Água/química , Água/farmacologiaRESUMO
The cyclin-dependent kinases Cdk4 and Cdk6 form complexes with D-type cyclins to drive cell proliferation. A well-known target of cyclin D-Cdk4,6 is the retinoblastoma protein Rb, which inhibits cell-cycle progression until its inactivation by phosphorylation. However, the role of Rb phosphorylation by cyclin D-Cdk4,6 in cell-cycle progression is unclear because Rb can be phosphorylated by other cyclin-Cdks, and cyclin D-Cdk4,6 has other targets involved in cell division. Here, we show that cyclin D-Cdk4,6 docks one side of an alpha-helix in the Rb C terminus, which is not recognized by cyclins E, A, and B. This helix-based docking mechanism is shared by the p107 and p130 Rb-family members across metazoans. Mutation of the Rb C-terminal helix prevents its phosphorylation, promotes G1 arrest, and enhances Rb's tumor suppressive function. Our work conclusively demonstrates that the cyclin D-Rb interaction drives cell division and expands the diversity of known cyclin-based protein docking mechanisms.
Assuntos
Proliferação de Células/genética , Ciclina D/genética , Mapas de Interação de Proteínas/genética , Proteína do Retinoblastoma/genética , Ciclo Celular/genética , Proteína Substrato Associada a Crk/genética , Ciclina D/química , Quinase 4 Dependente de Ciclina/química , Quinase 4 Dependente de Ciclina/genética , Quinase 6 Dependente de Ciclina/química , Quinase 6 Dependente de Ciclina/genética , Ciclinas/genética , Fase G1/genética , Humanos , Simulação de Acoplamento Molecular , Fosforilação/genética , Ligação Proteica/genética , Conformação Proteica em alfa-Hélice/genética , Proteína do Retinoblastoma/química , Proteína p107 Retinoblastoma-Like/genética , Fase S/genéticaRESUMO
The cell cycle is canonically described as a series of four consecutive phases: G1, S, G2, and M. In single cells, the duration of each phase varies, but the quantitative laws that govern phase durations are not well understood. Using time-lapse microscopy, we found that each phase duration follows an Erlang distribution and is statistically independent from other phases. We challenged this observation by perturbing phase durations through oncogene activation, inhibition of DNA synthesis, reduced temperature, and DNA damage. Despite large changes in durations in cell populations, phase durations remained uncoupled in individual cells. These results suggested that the independence of phase durations may arise from a large number of molecular factors that each exerts a minor influence on the rate of cell cycle progression. We tested this model by experimentally forcing phase coupling through inhibition of cyclin-dependent kinase 2 (CDK2) or overexpression of cyclin D. Our work provides an explanation for the historical observation that phase durations are both inherited and independent and suggests how cell cycle progression may be altered in disease states.