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1.
Int J Mol Sci ; 25(9)2024 May 06.
Artigo em Inglês | MEDLINE | ID: mdl-38732268

RESUMO

Rice (Oryza sativa) is one of the most important staple foods worldwide. However, rice blast disease, caused by the ascomycete fungus Magnaporthe oryzae, seriously affects the yield and quality of rice. Calmodulin-binding transcriptional activators (CAMTAs) play vital roles in the response to biotic stresses. In this study, we showed that OsCAMTA3 and CAMTA PROTEIN LIKE (OsCAMTAPL), an OsCAMTA3 homolog that lacks the DNA-binding domain, functioned together in negatively regulating disease resistance in rice. OsCAMTA3 associated with OsCAMTAPL. The oscamta3 and oscamtapl mutants showed enhanced resistance compared to wild-type plants, and oscamta3/pl double mutants showed more robust resistance to M. oryzae than oscamta3 or oscamtapl. An RNA-Seq analysis revealed that 59 and 73 genes, respectively, were differentially expressed in wild-type plants and oscamta3 before and after inoculation with M. oryzae, including OsALDH2B1, an acetaldehyde dehydrogenase that negatively regulates plant immunity. OsCAMTA3 could directly bind to the promoter of OsALDH2B1, and OsALDH2B1 expression was decreased in oscamta3, oscamtapl, and oscamta3/pl mutants. In conclusion, OsCAMTA3 associates with OsCAMTAPL to regulate disease resistance by binding and activating the expression of OsALDH2B1 in rice, which reveals a strategy by which rice controls rice blast disease and provides important genes for resistance breeding holding a certain positive impact on ensuring food security.


Assuntos
Resistência à Doença , Regulação da Expressão Gênica de Plantas , Oryza , Doenças das Plantas , Proteínas de Plantas , Oryza/microbiologia , Oryza/genética , Oryza/imunologia , Resistência à Doença/genética , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Doenças das Plantas/microbiologia , Doenças das Plantas/genética , Doenças das Plantas/imunologia , Ascomicetos/patogenicidade , Regiões Promotoras Genéticas , Magnaporthe/patogenicidade , Transativadores/genética , Transativadores/metabolismo , Mutação
2.
PLoS One ; 19(5): e0301082, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38722977

RESUMO

Branching morphogenesis is a complex process shared by many organs including the lungs, kidney, prostate, as well as several exocrine organs including the salivary, mammary and lacrimal glands. This critical developmental program ensures the expansion of an organ's surface area thereby maximizing processes of cellular secretion or absorption. It is guided by reciprocal signaling from the epithelial and mesenchymal cells. While signaling pathways driving salivary gland branching morphogenesis have been relatively well-studied, our understanding of the underlying transcriptional regulatory mechanisms directing this program, is limited. Here, we performed in vivo and ex vivo studies of the embryonic mouse submandibular gland to determine the function of the transcription factor ΔNp63, in directing branching morphogenesis. Our studies show that loss of ΔNp63 results in alterations in the differentiation program of the ductal cells which is accompanied by a dramatic reduction in branching morphogenesis that is mediated by dysregulation of WNT signaling. We show that ΔNp63 modulates WNT signaling to promote branching morphogenesis by directly regulating Sfrp1 expression. Collectively, our findings have revealed a novel role for ΔNp63 in the regulation of this critical process and offers a better understanding of the transcriptional networks involved in branching morphogenesis.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Membrana , Morfogênese , Animais , Camundongos , Morfogênese/genética , Proteínas de Membrana/metabolismo , Proteínas de Membrana/genética , Peptídeos e Proteínas de Sinalização Intercelular/metabolismo , Peptídeos e Proteínas de Sinalização Intercelular/genética , Glândulas Salivares/metabolismo , Glândulas Salivares/embriologia , Via de Sinalização Wnt , Glândula Submandibular/metabolismo , Glândula Submandibular/embriologia , Transativadores/metabolismo , Transativadores/genética , Diferenciação Celular
3.
FASEB J ; 38(9): e23637, 2024 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-38720403

RESUMO

Vascular smooth muscle cell (VSMC) plasticity is fundamental in uterine spiral artery remodeling during placentation in Eutherian mammals. Our previous work showed that the invasion of trophoblast cells into uterine myometrium coincides with a phenotypic change of VSMCs. Here, we elucidate the mechanism by which trophoblast cells confer VSMC plasticity. Analysis of genetic markers on E13.5, E16.5, and E19.5 in the rat metrial gland, the entry point of uterine arteries, revealed that trophoblast invasion is associated with downregulation of MYOCARDIN, α-smooth muscle actin, and calponin1, and concomitant upregulation of Smemb in VSMCs. Myocardin overexpression or knockdown in VSMCs led to upregulation or downregulation of contractile markers, respectively. Co-culture of trophoblast cells with VSMCs decreased MYOCARDIN expression along with compromised expression of contractile markers in VSMCs. However, co-culture of trophoblast cells with VSMCs overexpressing MYOCARDIN inhibited their change in phenotype, whereas, overexpression of transactivation domain deleted MYOCARDIN failed to elicit this response. Furthermore, the co-culture of trophoblast cells with VSMCs led to the activation of NFκß signaling. Interestingly, despite producing IL-1ß, trophoblast cells possess only the decoy receptor, whereas, VSMCs possess the IL-1ß signaling receptor. Treatment of VSMCs with exogenous IL-1ß led to a decrease in MYOCARDIN and an increase in phosphorylation of NFκß. The effect of trophoblast cells in the downregulation of MYOCARDIN in VSMCs was reversed by blocking NFκß translocation to the nucleus. Together, these data highlight that trophoblast cells direct VSMC plasticity, and trophoblast-derived IL-1ß is a key player in downregulating MYOCARDIN via the NFκß signaling pathway.


Assuntos
Interleucina-1beta , Músculo Liso Vascular , Miócitos de Músculo Liso , NF-kappa B , Proteínas Nucleares , Transdução de Sinais , Transativadores , Trofoblastos , Animais , Trofoblastos/metabolismo , Músculo Liso Vascular/metabolismo , Músculo Liso Vascular/citologia , Transativadores/metabolismo , Transativadores/genética , Ratos , Proteínas Nucleares/metabolismo , Proteínas Nucleares/genética , Transdução de Sinais/fisiologia , NF-kappa B/metabolismo , Feminino , Miócitos de Músculo Liso/metabolismo , Interleucina-1beta/metabolismo , Gravidez , Técnicas de Cocultura , Ratos Sprague-Dawley , Células Cultivadas , Plasticidade Celular/fisiologia , Calponinas
4.
Proc Natl Acad Sci U S A ; 121(20): e2321919121, 2024 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-38713625

RESUMO

Successful regeneration of missing tissues requires seamless integration of positional information along the body axes. Planarians, which regenerate from almost any injury, use conserved, developmentally important signaling pathways to pattern the body axes. However, the molecular mechanisms which facilitate cross talk between these signaling pathways to integrate positional information remain poorly understood. Here, we report a p21-activated kinase (smed-pak1) which functionally integrates the anterior-posterior (AP) and the medio-lateral (ML) axes. pak1 inhibits WNT/ß-catenin signaling along the AP axis and, functions synergistically with the ß-catenin-independent WNT signaling of the ML axis. Furthermore, this functional integration is dependent on warts and merlin-the components of the Hippo/Yorkie (YKI) pathway. Hippo/YKI pathway is a critical regulator of body size in flies and mice, but our data suggest the pathway regulates body axes patterning in planarians. Our study provides a signaling network integrating positional information which can mediate coordinated growth and patterning during planarian regeneration.


Assuntos
Padronização Corporal , Planárias , Proteínas Serina-Treonina Quinases , Regeneração , Via de Sinalização Wnt , Quinases Ativadas por p21 , Animais , Regeneração/fisiologia , Planárias/fisiologia , Planárias/genética , Planárias/metabolismo , Quinases Ativadas por p21/metabolismo , Quinases Ativadas por p21/genética , Via de Sinalização Wnt/fisiologia , Padronização Corporal/genética , Padronização Corporal/fisiologia , Proteínas Serina-Treonina Quinases/metabolismo , Proteínas Serina-Treonina Quinases/genética , Transativadores/metabolismo , Transativadores/genética , Proteínas Nucleares/metabolismo , Proteínas Nucleares/genética
5.
Breast Cancer Res ; 26(1): 74, 2024 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-38702730

RESUMO

The transcription factor TRPS1 is a context-dependent oncogene in breast cancer. In the mammary gland, TRPS1 activity is restricted to the luminal population and is critical during puberty and pregnancy. Its function in the resting state remains however unclear. To evaluate whether it could be a target for cancer therapy, we investigated TRPS1 function in the healthy adult mammary gland using a conditional ubiquitous depletion mouse model where long-term depletion does not affect fitness. Using transcriptomic approaches, flow cytometry and functional assays, we show that TRPS1 activity is essential to maintain a functional luminal progenitor compartment. This requires the repression of both YAP/TAZ and SRF/MRTF activities. TRPS1 represses SRF/MRTF activity indirectly by modulating RhoA activity. Our work uncovers a hitherto undisclosed function of TRPS1 in luminal progenitors intrinsically linked to mechanotransduction in the mammary gland. It may also provide new insights into the oncogenic functions of TRPS1 as luminal progenitors are likely the cells of origin of many breast cancers.


Assuntos
Glândulas Mamárias Animais , Proteínas Repressoras , Fator de Resposta Sérica , Células-Tronco , Fatores de Transcrição , Animais , Feminino , Camundongos , Glândulas Mamárias Animais/metabolismo , Glândulas Mamárias Animais/citologia , Fatores de Transcrição/metabolismo , Fatores de Transcrição/genética , Células-Tronco/metabolismo , Proteínas Repressoras/metabolismo , Proteínas Repressoras/genética , Fator de Resposta Sérica/metabolismo , Fator de Resposta Sérica/genética , Humanos , Transativadores/metabolismo , Transativadores/genética
6.
FASEB J ; 38(10): e23636, 2024 May 31.
Artigo em Inglês | MEDLINE | ID: mdl-38752683

RESUMO

Osteoarthritis (OA) and rheumatoid arthritis (RA) are two common forms of arthritis with undefined etiology and pathogenesis. Yes-associated protein (YAP) and its homolog transcriptional coactivator with PDZ-binding motif (TAZ), which act as sensors for cellular mechanical and inflammatory cues, have been identified as crucial players in the regulation of joint homeostasis. Current studies also reveal a significant association between YAP/TAZ and the pathogenesis of OA and RA. The objective of this review is to elucidate the impact of YAP/TAZ on different joint tissues and to provide inspiration for further studying the potential therapeutic implications of YAP/TAZ on arthritis. Databases, such as PubMed, Cochran Library, and Embase, were searched for all available studies during the past two decades, with keywords "YAP," "TAZ," "OA," and "RA."


Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Artrite Reumatoide , Osteoartrite , Fatores de Transcrição , Proteínas de Sinalização YAP , Humanos , Fatores de Transcrição/metabolismo , Animais , Artrite Reumatoide/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Proteínas de Sinalização YAP/metabolismo , Osteoartrite/metabolismo , Osteoartrite/etiologia , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional/metabolismo , Articulações/metabolismo , Articulações/patologia , Transativadores/metabolismo , Transativadores/genética
7.
FASEB J ; 38(9): e23633, 2024 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-38690712

RESUMO

Recent reports suggest that the Hippo signaling pathway regulates testis development, though its exact roles in Sertoli cell differentiation remain unknown. Here, we examined the functions of the main Hippo pathway kinases, large tumor suppressor homolog kinases 1 and 2 (Lats1 and Lats2) in developing mouse Sertoli cells. Conditional inactivation of Lats1/2 in Sertoli cells resulted in the disorganization and overgrowth of the testis cords, the induction of a testicular inflammatory response and germ cell apoptosis. Stimulated by retinoic acid 8 (STRA8) expression in germ cells additionally suggested that germ cells may have been preparing to enter meiosis prior to their loss. Gene expression analyses of the developing testes of conditional knockout animals further suggested impaired Sertoli cell differentiation, epithelial-to-mesenchymal transition, and the induction of a specific set of genes associated with Yes-associated protein (YAP) and transcriptional coactivator with PDZ-binding motif (TAZ)-mediated integrin signaling. Finally, the involvement of YAP/TAZ in Sertoli cell differentiation was confirmed by concomitantly inactivating Yap/Taz in Lats1/2 conditional knockout model, which resulted in a partial rescue of the testicular phenotypic changes. Taken together, these results identify Hippo signaling as a crucial pathway for Sertoli cell development and provide novel insight into Sertoli cell fate maintenance.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Diferenciação Celular , Proteínas Serina-Treonina Quinases , Células de Sertoli , Proteínas Supressoras de Tumor , Proteínas de Sinalização YAP , Animais , Células de Sertoli/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Proteínas Serina-Treonina Quinases/genética , Masculino , Camundongos , Proteínas de Sinalização YAP/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Proteínas Supressoras de Tumor/metabolismo , Proteínas Supressoras de Tumor/genética , Diferenciação Celular/fisiologia , Camundongos Knockout , Transdução de Sinais , Proteínas de Ciclo Celular/metabolismo , Proteínas de Ciclo Celular/genética , Testículo/metabolismo , Transição Epitelial-Mesenquimal/fisiologia , Fatores de Transcrição/metabolismo , Fatores de Transcrição/genética , Aciltransferases/genética , Aciltransferases/metabolismo , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional/metabolismo , Transativadores/metabolismo , Transativadores/genética
8.
Sci Signal ; 17(835): eadj0032, 2024 May 07.
Artigo em Inglês | MEDLINE | ID: mdl-38713765

RESUMO

Serum response factor (SRF) is an essential transcription factor for brain development and function. Here, we explored how an SRF cofactor, the actin monomer-sensing myocardin-related transcription factor MRTF, is regulated in mouse cortical neurons. We found that MRTF-dependent SRF activity in vitro and in vivo was repressed by cyclase-associated protein CAP1. Inactivation of the actin-binding protein CAP1 reduced the amount of actin monomers in the cytoplasm, which promoted nuclear MRTF translocation and MRTF-SRF activation. This function was independent of cofilin1 and actin-depolymerizing factor, and CAP1 loss of function in cortical neurons was not compensated by endogenous CAP2. Transcriptomic and proteomic analyses of cerebral cortex lysates from wild-type and Cap1 knockout mice supported the role of CAP1 in repressing MRTF-SRF-dependent signaling in vivo. Bioinformatic analysis identified likely MRTF-SRF target genes, which aligned with the transcriptomic and proteomic results. Together with our previous studies that implicated CAP1 in axonal growth cone function as well as the morphology and plasticity of excitatory synapses, our findings establish CAP1 as a crucial actin regulator in the brain relevant for formation of neuronal networks.


Assuntos
Actinas , Proteínas de Transporte , Córtex Cerebral , Camundongos Knockout , Fator de Resposta Sérica , Transativadores , Animais , Córtex Cerebral/metabolismo , Transativadores/metabolismo , Transativadores/genética , Fator de Resposta Sérica/metabolismo , Fator de Resposta Sérica/genética , Camundongos , Actinas/metabolismo , Actinas/genética , Neurônios/metabolismo , Proteínas dos Microfilamentos/metabolismo , Proteínas dos Microfilamentos/genética , Regulação da Expressão Gênica , Transdução de Sinais
10.
Nat Commun ; 15(1): 3729, 2024 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-38702330

RESUMO

The unique virus-cell interaction in Epstein-Barr virus (EBV)-associated malignancies implies targeting the viral latent-lytic switch is a promising therapeutic strategy. However, the lack of specific and efficient therapeutic agents to induce lytic cycle in these cancers is a major challenge facing clinical implementation. We develop a synthetic transcriptional activator that specifically activates endogenous BZLF1 and efficiently induces lytic reactivation in EBV-positive cancer cells. A lipid nanoparticle encapsulating nucleoside-modified mRNA which encodes a BZLF1-specific transcriptional activator (mTZ3-LNP) is synthesized for EBV-targeted therapy. Compared with conventional chemical inducers, mTZ3-LNP more efficiently activates EBV lytic gene expression in EBV-associated epithelial cancers. Here we show the potency and safety of treatment with mTZ3-LNP to suppress tumor growth in EBV-positive cancer models. The combination of mTZ3-LNP and ganciclovir yields highly selective cytotoxic effects of mRNA-based lytic induction therapy against EBV-positive tumor cells, indicating the potential of mRNA nanomedicine in the treatment of EBV-associated epithelial cancers.


Assuntos
Infecções por Vírus Epstein-Barr , Herpesvirus Humano 4 , Lipossomos , Nanopartículas , Transativadores , Humanos , Herpesvirus Humano 4/genética , Transativadores/metabolismo , Transativadores/genética , Infecções por Vírus Epstein-Barr/virologia , Infecções por Vírus Epstein-Barr/tratamento farmacológico , Animais , Nanopartículas/química , Linhagem Celular Tumoral , Camundongos , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Ativação Viral/efeitos dos fármacos , Ensaios Antitumorais Modelo de Xenoenxerto , Regulação Viral da Expressão Gênica/efeitos dos fármacos , Camundongos Nus , Feminino
11.
BMC Genomics ; 25(1): 441, 2024 May 03.
Artigo em Inglês | MEDLINE | ID: mdl-38702600

RESUMO

BACKGROUND: Quorum sensing (QS) is a sophisticated cell-to-cell signalling mechanism that allows the coordination of important processes in microbial populations. The AI-1 and AI-2 autoinducer systems are among the best characterized bacterial QS systems at the genetic level. RESULTS: In this study, we present data derived from in silico screening of QS proteins from bacterial genomes available in public databases. Sequence analyses allowed identifying candidate sequences of known QS systems that were used to build phylogenetic trees. Eight categories were established according to the number of genes from the two major QS systems present in each genome, revealing a correlation with specific taxa, lifestyles or metabolic traits. Many species had incomplete QS systems, encoding the receptor protein but not the biosynthesis of the quorum sensing molecule (QSMs). Reconstruction of the evolutionary history of the LuxR family and prediction of the 3D structure of the ancestral protein suggested their monomeric configuration in the absence of the signal molecule and the presence of a cavity for its binding. CONCLUSIONS: Here we correlate the taxonomic affiliation and lifestyle of bacteria from different genera with the QS systems encoded in their genomes. Moreover, we present the first ancestral reconstruction of the LuxR QS receptors, providing further insight in their evolutionary history.


Assuntos
Bactérias , Proteínas de Bactérias , Evolução Molecular , Filogenia , Percepção de Quorum , Percepção de Quorum/genética , Proteínas de Bactérias/genética , Proteínas de Bactérias/metabolismo , Bactérias/genética , Bactérias/metabolismo , Genoma Bacteriano , Transativadores/genética , Transativadores/metabolismo , Transativadores/química , Proteínas Repressoras/genética , Proteínas Repressoras/metabolismo
12.
Nat Commun ; 15(1): 4156, 2024 May 16.
Artigo em Inglês | MEDLINE | ID: mdl-38755141

RESUMO

Epstein-Barr virus (EBV) uses a biphasic lifecycle of latency and lytic reactivation to infect >95% of adults worldwide. Despite its central role in EBV persistence and oncogenesis, much remains unknown about how EBV latency is maintained. We used a human genome-wide CRISPR/Cas9 screen to identify that the nuclear protein SFPQ was critical for latency. SFPQ supported expression of linker histone H1, which stabilizes nucleosomes and regulates nuclear architecture, but has not been previously implicated in EBV gene regulation. H1 occupied latent EBV genomes, including the immediate early gene BZLF1 promoter. Upon reactivation, SFPQ was sequestered into sub-nuclear puncta, and EBV genomic H1 occupancy diminished. Enforced H1 expression blocked EBV reactivation upon SFPQ knockout, confirming it as necessary downstream of SFPQ. SFPQ knockout triggered reactivation of EBV in B and epithelial cells, as well as of Kaposi's sarcoma-associated herpesvirus in B cells, suggesting a conserved gamma-herpesvirus role. These findings highlight SFPQ as a major regulator of H1 expression and EBV latency.


Assuntos
Herpesvirus Humano 4 , Histonas , Fator de Processamento Associado a PTB , Ativação Viral , Latência Viral , Herpesvirus Humano 4/genética , Herpesvirus Humano 4/fisiologia , Humanos , Histonas/metabolismo , Ativação Viral/genética , Latência Viral/genética , Fator de Processamento Associado a PTB/metabolismo , Fator de Processamento Associado a PTB/genética , Regulação Viral da Expressão Gênica , Linfócitos B/virologia , Linfócitos B/metabolismo , Infecções por Vírus Epstein-Barr/virologia , Infecções por Vírus Epstein-Barr/genética , Infecções por Vírus Epstein-Barr/metabolismo , Sistemas CRISPR-Cas , Regiões Promotoras Genéticas/genética , Transativadores/metabolismo , Transativadores/genética , Genoma Viral
13.
Nat Commun ; 15(1): 4052, 2024 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-38744820

RESUMO

Obesity has emerged as a prominent risk factor for the development of malignant tumors. However, the existing literature on the role of adipocytes in the tumor microenvironment (TME) to elucidate the correlation between obesity and cancer remains insufficient. Here, we aim to investigate the formation of cancer-associated adipocytes (CAAs) and their contribution to tumor growth using mouse models harboring dysfunctional adipocytes. Specifically, we employ adipocyte-specific BECN1 KO (BaKO) mice, which exhibit lipodystrophy due to dysfunctional adipocytes. Our results reveal the activation of YAP/TAZ signaling in both CAAs and BECN1-deficient adipocytes, inducing adipocyte dedifferentiation and formation of a malignant TME. The additional deletion of YAP/TAZ from BaKO mice significantly restores the lipodystrophy and inflammatory phenotypes, leading to tumor regression. Furthermore, mice fed a high-fat diet (HFD) exhibit decreased BECN1 and increased YAP/TAZ expression in their adipose tissues. Treatment with the YAP/TAZ inhibitor, verteporfin, suppresses tumor progression in BaKO and HFD-fed mice, highlighting its efficacy against mice with metabolic dysregulation. Overall, our findings provide insights into the key mediators of CAA and their significance in developing a TME, thereby suggesting a viable approach targeting adipocyte homeostasis to suppress cancer growth.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Adipócitos , Dieta Hiperlipídica , Camundongos Knockout , Microambiente Tumoral , Proteínas de Sinalização YAP , Animais , Proteínas de Sinalização YAP/metabolismo , Adipócitos/metabolismo , Adipócitos/patologia , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Camundongos , Dieta Hiperlipídica/efeitos adversos , Fatores de Transcrição/metabolismo , Fatores de Transcrição/genética , Obesidade/metabolismo , Obesidade/patologia , Humanos , Verteporfina/farmacologia , Transdução de Sinais , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional , Progressão da Doença , Masculino , Transformação Celular Neoplásica/metabolismo , Transformação Celular Neoplásica/genética , Transformação Celular Neoplásica/patologia , Neoplasias/metabolismo , Neoplasias/patologia , Neoplasias/genética , Proteínas de Ciclo Celular/metabolismo , Proteínas de Ciclo Celular/genética , Lipodistrofia/metabolismo , Lipodistrofia/patologia , Lipodistrofia/genética , Camundongos Endogâmicos C57BL , Transativadores/metabolismo , Transativadores/genética
14.
Cell Transplant ; 33: 9636897241248942, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38712762

RESUMO

Recently, we and others generated induced tissue-specific stem/progenitor (iTS/iTP) cells. The advantages of iTS/iTP cells compared with induced pluripotent stem (iPS) cells are (1) easier generation, (2) efficient differentiation, and (3) no teratomas formation. In this study, we generated mouse induced pancreatic stem cells (iTS-P cells) by the plasmid vector expressing Yes-associated protein 1 (YAP). The iTS-P YAP9 cells expressed Foxa2 (endoderm marker) and Pdx1 (pancreatic marker) while the expressions of Oct3/4 and Nanog (marker of embryonic stem [ES] cells) in iTS-P YAP9 cells was significantly lower compared with those in ES cells. The iTS-P YAP9 cells efficiently differentiated into insulin-expressing cells compared with ES cells. The ability to generate autologous iTS cells may be applied to diverse applications of regenerative medicine.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Diferenciação Celular , Células-Tronco Pluripotentes Induzidas , Proteínas de Sinalização YAP , Animais , Camundongos , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Células-Tronco Pluripotentes Induzidas/citologia , Células-Tronco Pluripotentes Induzidas/metabolismo , Pâncreas/citologia , Pâncreas/metabolismo , Transativadores/metabolismo , Transativadores/genética , Proteínas de Homeodomínio/metabolismo , Proteínas de Homeodomínio/genética , Fator 3-beta Nuclear de Hepatócito/metabolismo , Fator 3-beta Nuclear de Hepatócito/genética , Fosfoproteínas/metabolismo , Fosfoproteínas/genética , Fator 3 de Transcrição de Octâmero/metabolismo , Fator 3 de Transcrição de Octâmero/genética
15.
Respir Res ; 25(1): 212, 2024 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-38762455

RESUMO

Paraquat (PQ) is a widely used herbicide and a common cause of poisoning that leads to pulmonary fibrosis with a high mortality rate. However, the underlying mechanisms of PQ-induced pulmonary fibrosis and whether pulmonary epithelial cell senescence is involved in the process remain elusive. In this study, PQ-induced pulmonary epithelial cell senescence and Hippo-YAP/TAZ activation were observed in both C57BL/6 mice and human epithelial cells. PQ-induced senescent pulmonary epithelial cells promoted lung fibroblast transformation through secreting senescence-associated secretory phenotype (SASP) factors. Yap/Taz knockdown in mice lungs significantly decreased the expression of downstream profibrotic protein Ctgf and senescent markers p16 and p21, and alleviated PQ-induced pulmonary fibrosis. Interfering YAP/TAZ in senescent human pulmonary epithelial cells resulted in decreased expression of the anti-apoptosis protein survivin and elevated level of apoptosis. In conclusion, our findings reveal a novel mechanism by which the involvement of Hippo-YAP/TAZ activation in pulmonary epithelial cell senescence mediates the pathogenesis of PQ-induced pulmonary fibrosis, thereby offering novel insights and potential targets for the clinical management of PQ poisoning as well as providing the mechanistic insight of the involvement of Yap/Taz activation in cell senescence in pulmonary fibrosis and its related pulmonary disorders. The YIN YANG balance between cell senescence and apoptosis is important to maintain the homeostasis of the lung, the disruption of which will lead to disease.


Assuntos
Proteínas Adaptadoras de Transdução de Sinal , Senescência Celular , Camundongos Endogâmicos C57BL , Paraquat , Fibrose Pulmonar , Fatores de Transcrição , Proteínas de Sinalização YAP , Animais , Senescência Celular/efeitos dos fármacos , Senescência Celular/fisiologia , Proteínas de Sinalização YAP/metabolismo , Humanos , Camundongos , Fibrose Pulmonar/metabolismo , Fibrose Pulmonar/induzido quimicamente , Fibrose Pulmonar/patologia , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Fatores de Transcrição/metabolismo , Fatores de Transcrição/genética , Paraquat/toxicidade , Masculino , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional/metabolismo , Células Epiteliais/metabolismo , Células Epiteliais/efeitos dos fármacos , Células Epiteliais/patologia , Transativadores/metabolismo , Transativadores/genética
16.
BMC Cancer ; 24(1): 587, 2024 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-38741073

RESUMO

YAP and TAZ, the Hippo pathway terminal transcriptional activators, are frequently upregulated in cancers. In tumor cells, they have been mainly associated with increased tumorigenesis controlling different aspects from cell cycle regulation, stemness, or resistance to chemotherapies. In fewer cases, they have also been shown to oppose cancer progression, including by promoting cell death through the action of the p73/YAP transcriptional complex, in particular after chemotherapeutic drug exposure. Using HCT116 cells, we show here that oxaliplatin treatment led to core Hippo pathway down-regulation and nuclear accumulation of TAZ. We further show that TAZ was required for the increased sensitivity of HCT116 cells to oxaliplatin, an effect that appeared independent of p73, but which required the nuclear relocalization of TAZ. Accordingly, Verteporfin and CA3, two drugs affecting the activity of YAP and TAZ, showed antagonistic effects with oxaliplatin in co-treatments. Importantly, using several colorectal cell lines, we show that the sensitizing action of TAZ to oxaliplatin is dependent on the p53 status of the cells. Our results support thus an early action of TAZ to sensitize cells to oxaliplatin, consistent with a model in which nuclear TAZ in the context of DNA damage and p53 activity pushes cells towards apoptosis.


Assuntos
Antineoplásicos , Neoplasias do Colo , Via de Sinalização Hippo , Compostos Organoplatínicos , Oxaliplatina , Proteínas Serina-Treonina Quinases , Transdução de Sinais , Transativadores , Fatores de Transcrição , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional , Proteína Supressora de Tumor p53 , Humanos , Oxaliplatina/farmacologia , Proteína Supressora de Tumor p53/metabolismo , Proteína Supressora de Tumor p53/genética , Neoplasias do Colo/tratamento farmacológico , Neoplasias do Colo/metabolismo , Neoplasias do Colo/patologia , Neoplasias do Colo/genética , Transativadores/metabolismo , Transativadores/genética , Fatores de Transcrição/metabolismo , Fatores de Transcrição/genética , Células HCT116 , Transdução de Sinais/efeitos dos fármacos , Proteínas Serina-Treonina Quinases/metabolismo , Proteínas Serina-Treonina Quinases/genética , Compostos Organoplatínicos/farmacologia , Compostos Organoplatínicos/uso terapêutico , Antineoplásicos/farmacologia , Peptídeos e Proteínas de Sinalização Intracelular/metabolismo , Peptídeos e Proteínas de Sinalização Intracelular/genética , Resistencia a Medicamentos Antineoplásicos/genética , Proteínas Supressoras de Tumor/metabolismo , Proteínas Supressoras de Tumor/genética , Proteínas Adaptadoras de Transdução de Sinal/metabolismo , Proteínas Adaptadoras de Transdução de Sinal/genética , Verteporfina/farmacologia , Verteporfina/uso terapêutico , Linhagem Celular Tumoral , Proteína Tumoral p73/metabolismo , Proteína Tumoral p73/genética , Proteínas de Sinalização YAP/metabolismo , Porfirinas/farmacologia , Proteínas Nucleares/metabolismo , Proteínas Nucleares/genética , Proteínas de Ligação a DNA/metabolismo , Proteínas de Ligação a DNA/genética , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Apoptose/efeitos dos fármacos
17.
Cell Commun Signal ; 22(1): 211, 2024 Apr 02.
Artigo em Inglês | MEDLINE | ID: mdl-38566191

RESUMO

The EP300-ZNF384 fusion gene is an oncogenic driver in B-cell acute lymphoblastic leukemia (B-ALL). In the present study, we demonstrated that EP300-ZNF384 substantially induces the transcription of IL3RA and the expression of IL3Rα (CD123) on B-ALL cell membranes. Interleukin 3 (IL-3) supplementation promotes the proliferation of EP300-ZNF348-positive B-ALL cells by activating STAT5. Conditional knockdown of IL3RA in EP300-ZF384-positive cells inhibited the proliferation in vitro, and induced a significant increase in overall survival of mice, which is attributed to impaired propagation ability of leukemia cells. Mechanistically, the EP300-ZNF384 fusion protein transactivates the promoter activity of IL3RA by binding to an A-rich sequence localized at -222/-234 of IL3RA. Furthermore, forced EP300-ZNF384 expression induces the expression of IL3Rα on cell membranes and the secretion of IL-3 in CD19-positive B precursor cells derived from healthy individuals. Doxorubicin displayed a selective killing of EP300-ZNF384-positive B-ALL cells in vitro and in vivo. Collectively, we identify IL3RA as a direct downstream target of EP300-ZNF384, suggesting CD123 is a potent biomarker for EP300-ZNF384-driven B-ALL. Targeting CD123 may be a novel therapeutic approach to EP300-ZNF384-positive patients, alternative or, more likely, complementary to standard chemotherapy regimen in clinical setting.


Assuntos
Leucemia-Linfoma Linfoblástico de Células Precursoras , Transativadores , Animais , Humanos , Camundongos , Doxorrubicina , Proteína p300 Associada a E1A , Interleucina-3 , Subunidade alfa de Receptor de Interleucina-3 , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Transativadores/metabolismo
18.
J Virol ; 98(5): e0042424, 2024 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-38629837

RESUMO

Chronic hepatitis B virus (HBV) infections are strongly associated with liver cirrhosis, inflammation, and hepatocellular carcinoma. In this context, the viral HBx protein is considered as a major factor influencing HBV-associated pathogenesis through deregulation of multiple cellular signaling pathways and is therefore a potential target for prognostic and therapeutic applications. However, HBV-associated pathogenesis differs significantly between genotypes, with the relevant factors and in particular the contribution of the genetic diversity of HBx being largely unknown. To address this question, we studied the specific genotype-dependent impact of HBx on cellular signaling pathways, focusing in particular on morphological and functional parameters of mitochondria. To exclusively investigate the impact of HBx of different genotypes on integrity and function of mitochondria in the absence of additional viral factors, we overexpressed HBx in Huh7 or HepG2 cells. Key signaling pathways were profiled by kinome analysis and correlated with expression levels of mitochondrial and pathogenic markers. Conclusively, HBx of genotypes A and G caused strong disruption of mitochondrial morphology alongside an induction of PTEN-induced putative kinase 1/Parkin-mediated mitophagy. These effects were only moderately dysregulated by genotypes B and E, whereas genotypes C and D exhibit an intermediate effect in this regard. Accordingly, changes in mitochondrial membrane potential and elevated reactive oxygen species production were associated with the HBx-mediated dysfunction among different genotypes. Also, genotype-related differences in mitophagy induction were identified and indicated that HBx-mediated changes in the mitochondria morphology and function strongly depend on the genotype. This indicates a relevant role of HBx in the process of genotype-dependent liver pathogenesis of HBV infections and reveals underlying mechanisms.IMPORTANCEThe hepatitis B virus is the main cause of chronic liver disease worldwide and differs in terms of pathogenesis and clinical outcome among the different genotypes. Furthermore, the viral HBx protein is a known factor in the progression of liver injury by inducing aberrant mitochondrial structures and functions. Consequently, the selective removal of dysfunctional mitochondria is essential to maintain overall cellular homeostasis and cell survival. Consistent with the intergenotypic difference of HBV, our data reveal significant differences regarding the impact of HBx of different genotypes on mitochondrial dynamic and function and thereby on radical oxygen stress levels within the cell. We subsequently observed that the induction of mitophagy differs significantly across the heterogenetic HBx proteins. Therefore, this study provides evidence that HBx-mediated changes in the mitochondria dynamics and functionality strongly depend on the genotype of HBx. This highlights an important contribution of HBx in the process of genotype-dependent liver pathogenesis.


Assuntos
Genótipo , Vírus da Hepatite B , Mitocôndrias , Dinâmica Mitocondrial , Transdução de Sinais , Transativadores , Proteínas Virais Reguladoras e Acessórias , Proteínas Virais Reguladoras e Acessórias/metabolismo , Transativadores/metabolismo , Transativadores/genética , Humanos , Vírus da Hepatite B/genética , Vírus da Hepatite B/metabolismo , Vírus da Hepatite B/fisiologia , Mitocôndrias/metabolismo , Células Hep G2 , Mitofagia , Espécies Reativas de Oxigênio/metabolismo , Ubiquitina-Proteína Ligases/metabolismo , Ubiquitina-Proteína Ligases/genética , Potencial da Membrana Mitocondrial , Hepatite B Crônica/virologia , Hepatite B Crônica/metabolismo , Hepatite B Crônica/patologia , Carcinoma Hepatocelular/virologia , Carcinoma Hepatocelular/metabolismo , Carcinoma Hepatocelular/patologia , Carcinoma Hepatocelular/genética
19.
Development ; 151(9)2024 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-38587174

RESUMO

The gastrointestinal (GI) tract is complex and consists of multiple organs with unique functions. Rare gene variants can cause congenital malformations of the human GI tract, although the molecular basis of these has been poorly studied. We identified a patient with compound-heterozygous variants in RFX6 presenting with duodenal malrotation and atresia, implicating RFX6 in development of the proximal intestine. To identify how mutations in RFX6 impact intestinal patterning and function, we derived induced pluripotent stem cells from this patient to generate human intestinal organoids (HIOs). We identified that the duodenal HIOs and human tissues had mixed regional identity, with gastric and ileal features. CRISPR-mediated correction of RFX6 restored duodenal identity. We then used gain- and loss-of-function and transcriptomic approaches in HIOs and Xenopus embryos to identify that PDX1 is a downstream transcriptional target of RFX6 required for duodenal development. However, RFX6 had additional PDX1-independent transcriptional targets involving multiple components of signaling pathways that are required for establishing early regional identity in the GI tract. In summary, we have identified RFX6 as a key regulator in intestinal patterning that acts by regulating transcriptional and signaling pathways.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento , Proteínas de Homeodomínio , Organoides , Fatores de Transcrição de Fator Regulador X , Transativadores , Humanos , Fatores de Transcrição de Fator Regulador X/genética , Fatores de Transcrição de Fator Regulador X/metabolismo , Animais , Proteínas de Homeodomínio/metabolismo , Proteínas de Homeodomínio/genética , Transativadores/metabolismo , Transativadores/genética , Organoides/metabolismo , Organoides/embriologia , Duodeno/metabolismo , Duodeno/embriologia , Intestinos/embriologia , Atresia Intestinal/genética , Células-Tronco Pluripotentes Induzidas/metabolismo , Padronização Corporal/genética , Transdução de Sinais/genética , Mutação/genética
20.
Pharmacol Res ; 203: 107167, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38599470

RESUMO

Cancer has become a burgeoning global healthcare concern marked by its exponential growth and significant economic ramifications. Though advancements in the treatment modalities have increased the overall survival and quality of life, there are no definite treatments for the advanced stages of this malady. Hence, understanding the diseases etiologies and the underlying molecular complexities, will usher in the development of innovative therapeutics. Recently, YAP/TAZ transcriptional regulation has been of immense interest due to their role in development, tissue homeostasis and oncogenic transformations. YAP/TAZ axis functions as coactivators within the Hippo signaling cascade, exerting pivotal influence on processes such as proliferation, regeneration, development, and tissue renewal. In cancer, YAP is overexpressed in multiple tumor types and is associated with cancer stem cell attributes, chemoresistance, and metastasis. Activation of YAP/TAZ mirrors the cellular "social" behavior, encompassing factors such as cell adhesion and the mechanical signals transmitted to the cell from tissue structure and the surrounding extracellular matrix. Therefore, it presents a significant vulnerability in the clogs of tumors that could provide a wide window of therapeutic effectiveness. Natural compounds have been utilized extensively as successful interventions in the management of diverse chronic illnesses, including cancer. Owing to their capacity to influence multiple genes and pathways, natural compounds exhibit significant potential either as adjuvant therapy or in combination with conventional treatment options. In this review, we delineate the signaling nexus of YAP/TAZ axis, and present natural compounds as an alternate strategy to target cancer.


Assuntos
Neoplasias , Fatores de Transcrição , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional , Proteínas de Sinalização YAP , Animais , Humanos , Antineoplásicos/uso terapêutico , Antineoplásicos/farmacologia , Produtos Biológicos/uso terapêutico , Produtos Biológicos/farmacologia , Neoplasias/tratamento farmacológico , Neoplasias/metabolismo , Neoplasias/patologia , Transdução de Sinais/efeitos dos fármacos , Transativadores/metabolismo , Fatores de Transcrição/metabolismo , Proteínas com Motivo de Ligação a PDZ com Coativador Transcricional/metabolismo , Proteínas de Sinalização YAP/metabolismo
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