RODRIGO ESAKI TAMURA
Projetos de Pesquisa
Unidades Organizacionais
LIM/24 - Laboratório de Oncologia Experimental, Hospital das Clínicas, Faculdade de Medicina
16 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 16
- p53 and metabolism: From mechanism to therapeutics(2018) SIMABUCO, F. M.; MORALE, M. G.; PAVAN, I. C. B.; MORELLI, A. P.; SILVA, F. R.; TAMURA, R. E.The tumor cell changes itself and its microenvironment to adapt to different situations, including action of drugs and other agents targeting tumor control. Therefore, metabolism plays an important role in the activation of survival mechanisms to keep the cell proliferative potential. The Warburg effect directs the cellular metabolism towards an aerobic glycolytic pathway, despite the fact that it generates less adenosine triphosphate than oxidative phosphorylation; because it creates the building blocks necessary for cell proliferation. The transcription factor p53 is the master tumor suppressor; it binds to more than 4,000 sites in the genome and regulates the expression of more than 500 genes. Among these genes are important regulators of metabolism, affecting glucose, lipids and amino acids metabolism, oxidative phosphorylation, reactive oxygen species (ROS) generation and growth factors signaling. Wild-type and mutant p53 may have opposing effects in the expression of these metabolic genes. Therefore, depending on the p53 status of the cell, drugs that target metabolism may have different outcomes and metabolism may modulate drug resistance. Conversely, induction of p53 expression may regulate differently the tumor cell metabolism, inducing senescence, autophagy and apoptosis, which are dependent on the regulation of the PI3K/AKT/mTOR pathway and/or ROS induction. The interplay between p53 and metabolism is essential in the decision of cell fate and for cancer therapeutics. © Simabuco et al.
- Use of p19Arf/interferon-beta immunotherapy in association with chemotherapy permits reduced drug dosage and avoids cardiotoxicity associated with doxorubicin(2019) STRAUSS, Bryan E.; MEDRANO, Ruan F. V.; TAMURA, Rodrigo; MENDONCA, Samir A.; FEITOSA, Valker A.; DARIOLLI, Rafael; SALLES, Thiago A.; HUNGER, Aline; CATANI, Joao P. P.; RODRIGUES, Elaine G.
conferenceObject Gene therapy and chemotherapy cooperate to inhibit prostate cancer progression in an animal model(2018) TAMURA, Rodrigo Esaki; STRAUSS, Bryan Eric- Distinct Roles of Direct Transduction Versus Exposure to the Tumor Secretome on Murine Endothelial Cells After Melanoma Gene Therapy with Interferon-beta and p19Arf(2019) VIEIRA, Igor de Luna; TAMURA, Rodrigo Esaki; HUNGER, Aline; STRAUSS, Bryan E.Tumor vasculature plays a central role in tumor progression, making it an attractive therapeutic target. In this study, we explore the antiangiogenic potential of our melanoma gene therapy approach combining interferon beta (IFN beta) and p19Arf gene transfer. Since these proteins are modulators of tumor vasculature, we explore the impact of IFN beta and p19Arf gene transfer on murine endothelial cells (tEnd). Adenovirus-mediated gene transfer of p19Arf to tEnd cells inhibited proliferation, tube formation, migration, and led to increased expression of genes related to the p53 cell death pathway, yet IFN beta gene transfer had no significant impact on tEnd viability. Alternatively, tEnd cells were exposed to the factors generated by transduced B16 (mouse melanoma) cells using either coculture or conditioned medium. In either case, transduction of B16 cells with the IFN beta vector, whether alone or in combination with p19Arf, resulted in endothelial cell death. Strikingly, treatment of tEnd cells with recombinant IFN beta did not induce death, demonstrating that additional factors produced by B16 cells contributed to the demise of tEnd cells. In this work, we have shown that our melanoma gene therapy strategy produces desirable negative effects on endothelial cells, possibly correlating with antiangiogenic activity.
bookPart Angiogênese tumoral(2015) VIEIRA, Igor de Luna; TAMURA, Rodrigo Esaki; CHAMMAS, Roger- Combination of cabazitaxel and p53 gene therapy abolishes prostate carcinoma tumor growth(2020) TAMURA, Rodrigo Esaki; LANA, Marlous G.; COSTANZI-STRAUSS, Eugenia; STRAUSS, Bryan E.For patients with metastatic prostate cancer, the 5-year survival rate of 31% points to a need for novel therapies and improvement of existing modalities. We propose that p53 gene therapy and chemotherapy, when combined, will provide superior tumor cell killing for the treatment of prostate carcinoma. To this end, we have developed the AdRGD-PGp53 vector which offers autoregulated expression of p53, resulting in enhanced tumor cell killing in vitro and in vivo. Here, we combined AdRGD-PGp53 along with the chemotherapy drugs used in the clinical treatment of prostate carcinoma, mitoxantrone, docetaxel, or cabazitaxel. Our results indicate that all drugs increase phosphorylation of p53, leading to improved induction of p53 targets. In vitro experiments reveal that AdRGD-PGp53 sensitizes prostate cancer cells to each of the drugs tested, conferring increased levels of cell death. In a xenograft mouse model of in situ gene therapy, AdRGD-PGp53 treatment, when combined with cabazitaxel, drastically reduced tumor progression and increased survival rates to 100%. Strikingly, we used a sub-therapeutic dose of cabazitaxel thus avoiding leukopenia, yet still showed potent anti-tumor effects when combined with AdRGD-PGp53 in this mouse model. The AdRGD-PGp53 approach warrants further development for its application in gene therapy of prostate carcinoma.
- Improving adenoviral vectors and strategies for prostate cancer gene therapy(2018) TAMURA, Rodrigo Esaki; LUNA, Igor Vieira de; LANA, Marlous Gomes; STRAUSS, Bryan E.Gene therapy has been evaluated for the treatment of prostate cancer and includes the application of adenoviral vectors encoding a suicide gene or oncolytic adenoviruses that may be armed with a functional transgene. In parallel, versions of adenoviral vector expressing the p53 gene (Ad-p53) have been tested as treatments for head and neck squamous cell carcinoma and non-small cell lung cancer. Although Ad-p53 gene therapy has yielded some interesting results when applied to prostate cancer, it has not been widely explored, perhaps due to current limitations of the approach. To achieve better functionality, improvements in the gene transfer system and the therapeutic regimen may be required. We have developed adenoviral vectors whose transgene expression is controlled by a p53-responsive promoter, which creates a positive feedback mechanism when used to drive the expression of p53. Together with improvements that permit efficient transduction, this new approach was more effective than the use of traditional versions of Ad-p53 in killing prostate cancer cell lines and inhibiting tumor progression. Even so, gene therapy is not expected to replace traditional chemotherapy but should complement the standard of care. In fact, chemotherapy has been shown to assist in viral transduction and transgene expression. The cooperation between gene therapy and chemotherapy is expected to effectively kill tumor cells while permitting the use of reduced chemotherapy drug concentrations and, thus, lowering side effects. Therefore, the combination of gene therapy and chemotherapy may prove essential for the success of both approaches.
conferenceObject Death of endothelial cells induced by paracrine exposure to factors derived from murine melanoma cells upon interferon-beta gene therapy.(2018) VIEIRA, Igor de Luna; TAMURA, Rodrigo Esaki; STRAUSS, Bryan Eric- Bicistronic transfer of CDKN2A and p53 culminates in collaborative killing of human lung cancer cells in vitro and in vivo(2020) XANDE, Juliana G.; DIAS, Ana P.; TAMURA, Rodrigo E.; CRUZ, Mario C.; BRITO, Barbara; FERREIRA, Robledo A.; STRAUSS, Bryan E.; COSTANZI-STRAUSS, EugeniaCancer therapies that target a single protein or pathway may be limited by their specificity, thus missing key players that control cellular proliferation and contributing to the failure of the treatment. We propose that approaches to cancer therapy that hit multiple targets would limit the chances of escape. To this end, we have developed a bicistronic adenoviral vector encoding both the CDKN2A and p53 tumor suppressor genes. The bicistronic vector, AdCDKN2A-I-p53, supports the translation of both gene products from a single transcript, assuring that all transduced cells will express both proteins. We show that combined, but not single, gene transfer results in markedly reduced proliferation and increased cell death correlated with reduced levels of phosphorylated pRB, induction of CDKN1A and caspase 3 activity, yet avoiding the induction of senescence. Using isogenic cell lines, we show that these effects were not impeded by the presence of mutant p53. In a mouse model of in situ gene therapy, a single intratumoral treatment with the bicistronic vector conferred markedly inhibited tumor progression while the treatment with either CDKN2A or p53 alone only partially controlled tumor growth. Histologic analysis revealed widespread transduction, yet reduced proliferation and increased cell death was associated only with the simultaneous transfer of CDKN2A and p53. We propose that restoration of two of the most frequently altered genes in human cancer, mediated by AdCDKN2A-I-p53, is beneficial since multiple targets are reached, thus increasing the efficacy of the treatment.
- S6Ks isoforms contribute to viability, migration, docetaxel resistance and tumor formation of prostate cancer cells(2016) AMARAL, Camila L.; FREITAS, Lidia B.; TAMURA, Rodrigo E.; TAVARES, Mariana R.; PAVAN, Isadora C. B.; BAJGELMAN, Marcio C.; SIMABUCO, Fernando M.Background: The S6 Kinase (S6K) proteins are some of the main downstream effectors of the mammalian Target Of Rapamycin (mTOR) and act as key regulators of protein synthesis and cell growth. S6K is overexpressed in a variety of human tumors and is correlated to poor prognosis in prostate cancer. Due to the current urgency to identify factors involved in prostate cancer progression, we aimed to reveal the cellular functions of three S6K isoforms-p70-S6K1, p85-S6K1 and p54-S6K2-in prostate cancer, as well as their potential as therapeutic targets. Methods: In this study we performed S6K knockdown and overexpression and investigated its role in prostate cancer cell proliferation, colony formation, viability, migration and resistance to docetaxel treatment. In addition, we measured tumor growth in Nude mice injected with PC3 cells overexpressing S6K isoforms and tested the efficacy of a new available S6K1 inhibitor in vitro. Results: S6Ks overexpression enhanced PC3-luc cell line viability, migration, resistance to docetaxel and tumor formation in Nude mice. Only S6K2 knockdown rendered prostate cancer cells more sensitive to docetaxel. S6K1 inhibitor PF-4708671 was particularly effective for reducing migration and proliferation of PC3 cell line. Conclusions: These findings demonstrate that S6Ks play an important role in prostate cancer progression, enhancing cell viability, migration and chemotherapy resistance, and place both S6K1 and S6K2 as a potential targets in advanced prostate cancer. We also provide evidence that S6K1 inhibitor PF-4708671 may be considered as a potential drug for prostate cancer treatment.