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1.
Pediatr Blood Cancer ; 68(8): e28930, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-33565268

RESUMO

BACKGROUND: Ependymoma is the third most common malignant CNS tumor in children. Despite multimodal therapy, prognosis of relapsed ependymoma remains poor. Approaches to therapy for relapsed ependymoma are varied. We present a single-institution retrospective review of the outcomes after first relapse of intracranial ependymoma in children. PROCEDURE: We performed a retrospective, IRB-approved chart review of patients with recurrent intracranial ependymoma treated at Dana-Farber/Boston Children's Cancer and Blood Disorders Center from 1990 to 2019. RESULTS: Thirty-four patients with relapsed intracranial ependymoma were identified. At initial diagnosis, 11 patients had supratentorial disease, 22 with posterior fossa disease and one with metastatic disease. Median time-to-first relapse was 14.9 months from initial diagnosis (range 1.4-52.5). Seven patients had metastatic disease at first relapse. Gross total resection (GTR) was associated with improved 5-year progression-free survival (PFS) relative to subtotal resection (STR) and no surgery (p = .005). Localized disease at relapse was associated with improved 5-year overall survival (OS) when compared to metastatic disease (p = .02). Irradiation at first relapse seemed to delay progression but was not associated with statistically prolonged PFS or OS. Tumor location, histology, and chromosomal 1q status did not impact outcome at first relapse, although available molecular data were limited making definitive conclusions difficult. Median time-to-second relapse was 10 months (range 0.7-124). Five-year PFS and OS after first relapse were 19.9% and 45.1%, respectively. Median PFS and OS were 10.0 and 52.5 months after first relapse, respectively. CONCLUSIONS: Relapsed intracranial ependymoma has a poor prognosis despite multimodal therapy. Novel therapeutic strategies are desperately needed for this disease.


Assuntos
Neoplasias Encefálicas , Ependimoma , Neoplasias Encefálicas/terapia , Pré-Escolar , Doença Crônica , Ependimoma/terapia , Humanos , Lactente , Recidiva Local de Neoplasia/terapia , Estudos Retrospectivos
2.
J Neurooncol ; 149(1): 113-122, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32627129

RESUMO

INTRODUCTION: Immune checkpoint inhibition through PD-1 and CTLA-4 blockade has shown efficacy in some adult malignancies and generated interest in pediatrics, including central nervous system (CNS) tumors. We describe our experience with immune checkpoint inhibition in recurrent/refractory pediatric CNS tumors. METHODS: We performed a retrospective chart review of pediatric patients with recurrent or refractory CNS tumors treated with ipilimumab, nivolumab and/or pembrolizumab at Dana-Farber/Boston Children's Hospital between 2018 and 2019. RESULTS: Eleven patients were identified. Diagnoses included diffuse intrinsic pontine glioma (DIPG) (n = 2), high-grade glioma (HGG) (n = 5), ependymoma (n = 1), craniopharyngioma (n = 1), high-grade neuroepithelial tumor (n = 1) and non-germinomatous germ cell tumor (NGGCT) (n = 1). Eight patients had recurrent disease, while three had refractory disease. Nine patients received combination therapy (ipilimumab/nivolumab); two patients received either nivolumab or pembrolizumab. Median time from diagnosis-to-treatment was 8 months (range 0.8-156). All patients received prior radiation therapy (RT), with median time from RT-to-immunotherapy was 3.8 years. One patient received concurrent then adjuvant immunotherapy with RT. Median duration of treatment was 6.1 months (range 1-25). Therapy was discontinued in nine patients: seven due to disease progression and two due to toxicity (colitis; transaminitis). Other pertinent toxicities included Type 1 diabetes mellitus, hypothyroidism and skin toxicity. Based on iRANO criteria, best responses included partial response (n = 3), stable disease (n = 7) and progressive disease (n = 1). Durable response was noted in two patients. CONCLUSION: Immune checkpoint inhibition was relatively well tolerated in a cohort of pediatric patients spanning several CNS tumor diagnoses. Results from prospective clinical trials will be critical to inform clinical decisions.


Assuntos
Neoplasias do Sistema Nervoso Central/tratamento farmacológico , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Inibidores de Checkpoint Imunológico/uso terapêutico , Recidiva Local de Neoplasia/tratamento farmacológico , Terapia de Salvação , Adolescente , Adulto , Neoplasias do Sistema Nervoso Central/imunologia , Neoplasias do Sistema Nervoso Central/patologia , Criança , Pré-Escolar , Feminino , Seguimentos , Humanos , Masculino , Recidiva Local de Neoplasia/imunologia , Recidiva Local de Neoplasia/patologia , Prognóstico , Estudos Retrospectivos , Adulto Jovem
3.
J Neurooncol ; 149(2): 253-262, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32780261

RESUMO

PURPOSE: Pediatric low-grade gliomas (pLGGs) are the most common CNS tumor of childhood and comprise a heterogenous group of tumors. Children with progressive pLGG often require numerous treatment modalities including surgery, chemotherapy, rarely radiation therapy and, more recently, molecularly targeted therapy. We describe our institutional experience using the MEK inhibitor, trametinib, for recurrent/progressive pLGGs. METHODS: We performed a retrospective, IRB-approved, chart review of all pediatric patients treated with trametinib for recurrent/progressive pLGGs at Dana-Farber/Boston Children's Cancer and Blood Disorder Center between 2016 and 2018. RESULTS: Eleven patients were identified, of which 10 were evaluable for response. Median age at commencement of trametinib treatment was 14.7 years (range 7.3-25.9 years). Tumor molecular status included KIAA1549-BRAF fusion (n = 4), NF1 mutation (n = 4), FGFR mutation (n = 1) and CDKN2A loss (n = 1). Median number of prior treatment regimens was 5 (range 1-12). Median duration of treatment with trametinib was 19.2 months (range 3.8-29.8 months). Based on modified RANO criteria, best responses included partial (n = 2), minor response (n = 2) and stable disease (n = 6). Two patients remain on therapy (29.8 and 25.9 months, respectively). The most common toxicities attributable to trametinib were rash, fatigue and gastrointestinal disturbance. Five patients required dose reduction for toxicities. Two patients experienced significant intracranial hemorrhage (ICH) while on trametinib. While it is unclear whether ICH was directly attributable to trametinib, therapy was discontinued. CONCLUSION: Trametinib appears to be an effective treatment for patients with recurrent/progressive pLGG. The toxicities of this therapy warrant further investigation, with particular attention to the potential risk for intracranial hemorrhage. Early phase multi-institutional clinical trials are underway.


Assuntos
Antineoplásicos/uso terapêutico , Neoplasias Encefálicas/tratamento farmacológico , Glioma/tratamento farmacológico , Recidiva Local de Neoplasia/tratamento farmacológico , Piridonas/uso terapêutico , Pirimidinonas/uso terapêutico , Adolescente , Adulto , Neoplasias Encefálicas/patologia , Criança , Feminino , Seguimentos , Glioma/patologia , Humanos , Masculino , Recidiva Local de Neoplasia/patologia , Prognóstico , Estudos Retrospectivos , Adulto Jovem
4.
Int J Med Sci ; 17(17): 2831-2843, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33162811

RESUMO

Mammalian target of rapamycin (mTOR) is upregulated in a high percentage of glioblastomas. While a well-known mTOR inhibitor, rapamycin, has been shown to reduce glioblastoma survival, the role of mitochondria in achieving this therapeutic effect is less well known. Here, we examined mitochondrial dysfunction mechanisms that occur with the suppression of mTOR signaling. We found that, along with increased apoptosis, and a reduction in transformative potential, rapamycin treatment significantly affected mitochondrial health. Specifically, increased production of reactive oxygen species (ROS), depolarization of the mitochondrial membrane potential (MMP), and altered mitochondrial dynamics were observed. Furthermore, we verified the therapeutic potential of rapamycin-induced mitochondrial dysfunction through co-treatment with temzolomide (TMZ), the current standard of care for glioblastoma. Together these results demonstrate that the mitochondria remain a promising target for therapeutic intervention against human glioblastoma and that TMZ and rapamycin have a synergistic effect in suppressing glioblastoma viability, enhancing ROS production, and depolarizing MMP.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/farmacologia , Neoplasias Encefálicas/tratamento farmacológico , Glioblastoma/tratamento farmacológico , Sirolimo/farmacologia , Temozolomida/farmacologia , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Apoptose/efeitos dos fármacos , Neoplasias Encefálicas/patologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Sinergismo Farmacológico , Glioblastoma/patologia , Humanos , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Mitocôndrias/efeitos dos fármacos , Mitocôndrias/patologia , Dinâmica Mitocondrial/efeitos dos fármacos , Espécies Reativas de Oxigênio , Transdução de Sinais/efeitos dos fármacos , Sirolimo/uso terapêutico , Serina-Treonina Quinases TOR/antagonistas & inibidores , Serina-Treonina Quinases TOR/metabolismo , Temozolomida/uso terapêutico
5.
BMC Neurosci ; 19(1): 82, 2018 Dec 29.
Artigo em Inglês | MEDLINE | ID: mdl-30594149

RESUMO

BACKGROUND: Cobalt chloride (CoCl2) induces chemical hypoxia through activation of hypoxia-inducible factor-1 alpha (HIF-1α). Mammalian target of rapamycin (mTOR) is a multifaceted protein capable of regulating cell growth, angiogenesis, metabolism, proliferation, and survival. In this study, we tested the efficacy of a well-known mTOR inhibitor, rapamycin, in reducing oxidative damage and increasing cell viability in the mouse hippocampal cell line, HT22, during a CoCl2-simulated hypoxic insult. RESULTS: CoCl2 caused cell death in a dose-dependent manner and increased protein levels of cleaved caspase-9 and caspase-3. Rapamycin increased viability of HT22 cells exposed to CoCl2 and reduced activation of caspases-9 and -3. Cells exposed to CoCl2 displayed increased reactive oxygen species (ROS) production and hyperpolarization of the mitochondrial membrane, both of which rapamycin successfully blocked. mTOR protein itself, along with its downstream signaling target, phospho-S6 ribosomal protein (pS6), were significantly inhibited with CoCl2 and rapamycin addition did not significantly lower expression further. Rapamycin promoted protein expression of Beclin-1 and increased conversion of microtubule-associated protein light chain 3 (LC3)-I into LC3-II, suggesting an increase in autophagy. Pro-apoptotic protein, Bcl-2 associated × (Bax), exhibited a slight, but significant decrease with rapamycin treatment, while its anti-apoptotic counterpart, B cell lymphoma-2 (Bcl-2), was to a similar degree upregulated. Finally, the protein expression ratio of phosphorylated mitogen-activated protein kinase (pMAPK) to its unphosphorylated form (MAPK) was dramatically increased in rapamycin and CoCl2 co-treated cells. CONCLUSIONS: Our results indicate that rapamycin confers protection against CoCl2-simulated hypoxic insults to neuronal cells. This occurs, as suggested by our results, independent of mTOR modification, and rather through stabilization of the mitochondrial membrane with concomitant decreases in ROS production. Additionally, inhibition of caspase-9 and -3 activation and stimulation of protective autophagy reduces cell death, while a decrease in the Bax/Bcl-2 ratio and an increase in pMAPK promotes cell survival during CoCl2 exposure. Together these results demonstrate the therapeutic potential of rapamycin against hypoxic injury and highlight potential pathways mediating the protective effects of rapamycin treatment.


Assuntos
Sobrevivência Celular/efeitos dos fármacos , Cobalto/toxicidade , Hipocampo/efeitos dos fármacos , Fármacos Neuroprotetores/farmacologia , Sirolimo/farmacologia , Animais , Autofagia/efeitos dos fármacos , Autofagia/fisiologia , Caspase 3/metabolismo , Caspase 9/metabolismo , Linhagem Celular , Sobrevivência Celular/fisiologia , Relação Dose-Resposta a Droga , Hipocampo/metabolismo , Potencial da Membrana Mitocondrial/efeitos dos fármacos , Potencial da Membrana Mitocondrial/fisiologia , Camundongos , Quinases de Proteína Quinase Ativadas por Mitógeno/metabolismo , Proteínas Proto-Oncogênicas c-bcl-2/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Serina-Treonina Quinases TOR/antagonistas & inibidores , Serina-Treonina Quinases TOR/metabolismo , Proteína X Associada a bcl-2/metabolismo
6.
Int J Med Sci ; 15(12): 1384-1396, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30275767

RESUMO

Cerebral hypoxia as often occurs in cases of stroke, hemorrhage, or other traumatic brain injuries, is one of the leading causes of death worldwide and a main driver of disabilities in the elderly. Using a chemical mimetic of hypoxia, cobalt chloride (CoCl2), we tested the ability of a novel small molecule, 4-chloro-N-(naphthalen-1-ylmethyl)-5-(3-(piperazin-1-yl)phenoxy)thiophene-2-sulfonamide (B355252), to alleviate CoCl2-induced damage in mouse hippocampal HT22 cells. A dose-dependent decrease in cell viability was observed during CoCl2 treatment along with increases in mitochondrial membrane potential and generation of reactive oxygen species (ROS). B355252 conferred protection against these changes. We further found that mitochondrial dynamics, the balance between mitochondrial fusion and fission, were perturbed by CoCl2 treatment. Mitochondrial fusion, which was assessed by measuring the expression of proteins optic atrophy protein 1 (OPA1) and mitofusin 2 (Mfn2), declined due to CoCl2 exposure, but B355252 addition was able to elevate Mfn2 expression while OPA1 expression was unchanged. Mitochondrial fission, measured by phosphorylated dynamin-related protein 1 (p-DRP1) and fission protein 1 (FIS1) expression, also decreased following CoCl2 exposure, and was stabilized by B355252 addition. Finally, autophagy was assessed by measuring the conversion of cytosolic microtubule-associated protein 1A/1B-light chain three-I (LC3-I) to autophagosome-bound microtubule-associated protein 1A/1B-light chain three-II (LC3-II) and was found to be increased by CoCl2. B355252 addition significantly reduced autophagy induction. Taken together, our results indicate B355252 has therapeutic potential to reduce the damaging effects caused by CoCl2 and should be further evaluated for applications in cerebral ischemia therapy.


Assuntos
Autofagia/efeitos dos fármacos , Cobalto/toxicidade , Hipocampo/efeitos dos fármacos , Dinâmica Mitocondrial/efeitos dos fármacos , Fármacos Neuroprotetores/farmacologia , Tiofenos/farmacologia , Animais , Camundongos , Mitocôndrias , Neuroproteção , Espécies Reativas de Oxigênio
7.
Neurochem Res ; 42(4): 1096-1103, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28190227

RESUMO

Parkinson's disease is a neurodegenerative disorder characterized by mitochondrial dysfunction and oxidative stress. It is usually accompanied by an imbalance in mitochondrial dynamics and changes in mitochondrial morphology that are associated with impaired function. The objectives of this study were to identify the effects of rotenone, a drug known to mimic the pathophysiology of Parkinson's disease, on mitochondrial dynamics. Additionally, this study explored the protective effects of water-soluble Coenzyme Q10 (CoQ10) against rotenone-induced cytotoxicity in murine neuronal HT22 cells. Our results demonstrate that rotenone elevates protein expression of mitochondrial fission markers, Drp1 and Fis1, and causes an increase in mitochondrial fragmentation as evidenced through mitochondrial staining and morphological analysis. Water-soluble CoQ10 prevented mitochondrial dynamic imbalance by reducing Drp1 and Fis1 protein expression to pre-rotenone levels, as well as reducing rotenone treatment-associated mitochondrial fragmentation. Hence, water-soluble CoQ10 may have therapeutic potential in treating patients with Parkinson's disease.


Assuntos
Sobrevivência Celular/efeitos dos fármacos , Dinâmica Mitocondrial/efeitos dos fármacos , Rotenona/toxicidade , Ubiquinona/análogos & derivados , Animais , Linhagem Celular , Sobrevivência Celular/fisiologia , Hipocampo/citologia , Hipocampo/efeitos dos fármacos , Hipocampo/fisiologia , Camundongos , Dinâmica Mitocondrial/fisiologia , Solubilidade , Ubiquinona/metabolismo , Ubiquinona/farmacologia , Água/metabolismo
8.
BMC Cancer ; 14: 24, 2014 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-24422988

RESUMO

BACKGROUND: Ceramide is a bioeffector that mediates various cellular processes, including apoptosis. However, the mechanism underlying ceramide function in apoptosis is apparently cell type-dependent and is not well-understood. We aimed at identifying molecular targets of ceramide in metastatic human colon and breast cancer cells, and determining the efficacy of ceramide analog in suppression of colon and breast cancer metastasis. METHODS: The activity of and mechanism underlying ceramide as a cytotoxic agent, and as a sensitizer for Fas-mediated apoptosis was analyzed in human cell lines established from primary or metastatic colon and breast cancers. The efficacy of ceramide analog LCL85 in suppression of metastasis was examined in preclinical mouse tumor models. RESULTS: Exposure of human colon carcinoma cells to ceramide analog LCL85 results in apoptosis in a dose-dependent manner. Interestingly, a sublethal dose of LCL85 increased C16 ceramide content and overcame tumor cell resistance to Fas-mediated apoptosis. Subsequently, treatment of tumor cells with exogenous C16 ceramide resulted in increased tumor cell sensitivity to Fas-mediated apoptosis. LCL85 resembles Smac mimetic BV6 in sensitization of colon carcinoma cells to Fas-mediated apoptosis by inducing proteasomal degradation of cIAP1 and xIAP proteins. LCL85 also decreased xIAP1 and cIAP1 protein levels and sensitized metastatic human breast cancer cells to Fas-mediated apoptosis. Silencing xIAP and cIAP1 with specific siRNAs significantly increased the metastatic human colon carcinoma cell sensitivity to Fas-mediated apoptosis, suggesting that IAP proteins mediate apoptosis resistance in metastatic human colon carcinoma cells and ceramide induces IAP protein degradation to sensitize the tumor cells to apoptosis induction. Consistent with its apoptosis sensitization activity, subtoxic doses of LCL85 suppressed colon carcinoma cell metastatic potential in an experimental lung metastasis mouse model, as well as breast cancer growth and spontaneous lung metastasis in an orthotopic breast cancer mouse model. CONCLUSION: We have identified xIAP and cIAP1 as molecular targets of ceramide and determined that ceramide analog LCL85 is an effective sensitizer in overcoming resistance of human cell lines established from metastatic colon and breast cancers to apoptosis induction to suppress metastasis in vivo.


Assuntos
Antineoplásicos/farmacologia , Apoptose/efeitos dos fármacos , Neoplasias da Mama/tratamento farmacológico , Ceramidas/farmacologia , Neoplasias do Colo/tratamento farmacológico , Proteínas Inibidoras de Apoptose/metabolismo , Propanolaminas/farmacologia , Compostos de Piridínio/farmacologia , Animais , Neoplasias da Mama/genética , Neoplasias da Mama/metabolismo , Neoplasias da Mama/secundário , Linhagem Celular Tumoral , Neoplasias do Colo/genética , Neoplasias do Colo/metabolismo , Neoplasias do Colo/secundário , Progressão da Doença , Relação Dose-Resposta a Droga , Resistencia a Medicamentos Antineoplásicos , Feminino , Humanos , Proteínas Inibidoras de Apoptose/genética , Camundongos , Camundongos Endogâmicos BALB C , Terapia de Alvo Molecular , Interferência de RNA , Transdução de Sinais/efeitos dos fármacos , Transfecção , Ubiquitina-Proteína Ligases , Proteínas Inibidoras de Apoptose Ligadas ao Cromossomo X/genética , Proteínas Inibidoras de Apoptose Ligadas ao Cromossomo X/metabolismo , Ensaios Antitumorais Modelo de Xenoenxerto , Receptor fas/metabolismo
9.
Pediatr Blood Cancer ; 61(4): 636-42, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24123865

RESUMO

BACKGROUND: Preclinical models show that an antiangiogenic regimen at low-dose daily (metronomic) dosing may be effective against chemotherapy-resistant tumors. We undertook a prospective, open-label, single-arm, multi-institutional phase II study to evaluate the efficacy of a "5-drug" oral regimen in children with recurrent or progressive cancer. PROCEDURE: Patients ≤21 years old with recurrent or progressive tumors were eligible. Treatment consisted of continuous oral celecoxib, thalidomide, and fenofibrate, with alternating 21-day cycles of low-dose cyclophosphamide and etoposide. Primary endpoint was to assess, within eight disease strata, activity of the 5-drug regimen over 27 weeks. Blood and urine angiogenesis markers were assessed. RESULTS: One hundred one patients were enrolled; 97 began treatment. Median age was 10 years (range: 191 days-21 years); 47 (49%) were female. Disease strata included high-grade glioma (HGG, 21 patients), ependymoma (19), low-grade glioma (LGG, 12), bone tumors (12), medulloblastoma/primitive neuroectodermal tumor (PNET, 8), leukemia (4), neuroblastoma (3), and miscellaneous tumors (18). Treatment was generally well tolerated; most common toxicities were hematologic. Twenty-four (25%) patients completed 27 weeks therapy without progression, including HGG: 1 (5%), ependymoma: 7 (37%), LGG: 7 (58%), medulloblastoma/PNET: 1, neuroblastoma: 1, and miscellaneous tumors: 7 (39%). Best response was complete response (one patient with medulloblastoma), partial response (12), stable disease (36), progressive disease (47), and inevaluable (1). Baseline serum thrombospondin levels were significantly higher in patients successfully completing therapy than in those who progressed (P = 0.009). CONCLUSION: The 5-drug regimen was well tolerated. Clinical activity was demonstrated in some but not all tumor strata.


Assuntos
Inibidores da Angiogênese/uso terapêutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Recidiva Local de Neoplasia/tratamento farmacológico , Neoplasias/tratamento farmacológico , Neovascularização Patológica/tratamento farmacológico , Adolescente , Adulto , Celecoxib , Criança , Pré-Escolar , Ciclofosfamida/administração & dosagem , Etoposídeo/administração & dosagem , Feminino , Fenofibrato/administração & dosagem , Seguimentos , Humanos , Lactente , Masculino , Recidiva Local de Neoplasia/patologia , Estadiamento de Neoplasias , Neoplasias/patologia , Prognóstico , Estudos Prospectivos , Pirazóis/administração & dosagem , Sulfonamidas/administração & dosagem , Taxa de Sobrevida , Talidomida/administração & dosagem , Adulto Jovem
10.
J Immunol ; 188(9): 4441-9, 2012 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-22461695

RESUMO

The death receptor Fas and its physiological ligand (FasL) regulate apoptosis of cancerous cells, thereby functioning as a critical component of the host cancer immunosurveillance system. To evade Fas-mediated apoptosis, cancer cells often downregulate Fas to acquire an apoptosis-resistant phenotype, which is a hallmark of metastatic human colorectal cancer. Therefore, targeting Fas resistance is of critical importance in Fas-based cancer therapy and immunotherapy. In this study, we demonstrated that epigenetic inhibitors decitabine and vorinostat cooperate to upregulate Fas expression in metastatic human colon carcinoma cells. Decitabine also upregulates BNIP3 and Bik expression, whereas vorinostat decreased Bcl-x(L) expression. Altered expression of Fas, BNIP3, Bik, and Bcl-x(L) resulted in effective sensitization of the metastatic human colon carcinoma cells to FasL-induced apoptosis. Using an experimental metastasis mouse model, we further demonstrated that decitabine and vorinostat cooperate to suppress colon carcinoma metastasis. Analysis of tumor-bearing lung tissues revealed that a large portion of tumor-infiltrating CD8(+) T cells are FasL(+), and decitabine and vorinostat-mediated tumor-suppression efficacy was significantly decreased in Fas(gld) mice compared with wild-type mice, suggesting a critical role for FasL in decitabine and vorinostat-mediated tumor suppression in vivo. Consistent with their function in apoptosis sensitization, decitabine and vorinostat significantly increased the efficacy of CTL adoptive transfer immunotherapy in an experimental metastasis mouse model. Thus, our data suggest that combined modalities of chemotherapy to sensitize the tumor cell to Fas-mediated apoptosis and CTL immunotherapy is an effective approach for the suppression of colon cancer metastasis.


Assuntos
Protocolos de Quimioterapia Combinada Antineoplásica/farmacologia , Apoptose/efeitos dos fármacos , Azacitidina/análogos & derivados , Neoplasias do Colo/tratamento farmacológico , Proteína Ligante Fas/imunologia , Ácidos Hidroxâmicos/farmacologia , Proteínas Adaptadoras de Transdução de Sinal/imunologia , Transferência Adotiva/métodos , Animais , Apoptose/imunologia , Proteínas Reguladoras de Apoptose/imunologia , Azacitidina/farmacologia , Linfócitos T CD8-Positivos/imunologia , Linfócitos T CD8-Positivos/patologia , Linhagem Celular Tumoral , Neoplasias do Colo/imunologia , Neoplasias do Colo/patologia , Decitabina , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica/imunologia , Humanos , Proteínas de Membrana/imunologia , Camundongos , Proteínas Mitocondriais/imunologia , Metástase Neoplásica/patologia , Neoplasias Experimentais/tratamento farmacológico , Neoplasias Experimentais/imunologia , Neoplasias Experimentais/patologia , Proteínas Proto-Oncogênicas/imunologia , Evasão Tumoral/efeitos dos fármacos , Evasão Tumoral/imunologia , Vorinostat , Proteína bcl-X/imunologia
11.
J Immunol ; 187(9): 4426-30, 2011 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-21949018

RESUMO

A prominent phenotype of IRF8 knockout (KO) mice is the uncontrolled expansion of immature myeloid cells. The molecular mechanism underlying this myeloproliferative syndrome is still elusive. In this study, we observed that Bax expression level is low in bone marrow preginitor cells and increases dramatically in primary myeloid cells in wt mice. In contrast, Bax expression level remained at a low level in primarymyeloid cells in IRF8 KO mice. However, in vitro IRF8 KO bone marrow-differentiated myeloid cells expressed Bax at a level as high as that in wild type myeloid cells. Furthermore, we demonstrated that IRF8 specifically binds to the Bax promoter region in primary myeloid cells. Functional analysis indicated that IRF8 deficiency results in increased resistance of the primary myeloid cells to Fas-mediated apoptosis. Our findings show that IRF8 directly regulates Bax transcription in vivo, but not in vitro during myeloid cell lineage differentiation.


Assuntos
Fatores Reguladores de Interferon/fisiologia , Células Mieloides/imunologia , Células Mieloides/metabolismo , Transcrição Gênica/imunologia , Proteína X Associada a bcl-2/genética , Proteína X Associada a bcl-2/metabolismo , Animais , Apoptose/imunologia , Diferenciação Celular/genética , Diferenciação Celular/imunologia , Linhagem da Célula/imunologia , Fatores Reguladores de Interferon/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Células Mieloides/citologia , Cultura Primária de Células , Regiões Promotoras Genéticas/imunologia , Ligação Proteica/genética , Ligação Proteica/imunologia , Esplenomegalia/imunologia , Esplenomegalia/metabolismo , Esplenomegalia/patologia
12.
Womens Health Rep (New Rochelle) ; 4(1): 103-110, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36874238

RESUMO

Background: Orthopedic residency programs increasingly use websites and social media to reach students. This accelerated during the COVID-19 pandemic, especially as away rotations became limited. Women remain a minority of orthopedic residents, and there are no data that indicate the correlation between department/program website content or social media presence on the gender diversity of residency classes. Methods: Orthopedic department websites were assessed between June 2021 and January 2022 to identify program director's gender, as well as the gender composition of the faculty and residents. Instagram presence for the department and/or program was also identified. Results: There was no correlation found between the residency program director's gender and the gender diversity of residents in a given program. The percentage of women faculty identified on a department website was significantly correlated with the percentage of women residents in the program, regardless of the program director's gender. While there was an increase in the percentage of women residents among programs with Instagram accounts for the class that started in 2021, this was negated when the percentage of women faculty was taken into account. Conclusion: Efforts on multiple fronts will be needed to increase the number and percentage of women applying for and training in orthopedic surgery. Given the increasing use of digital media, we need a better understanding of what information, including faculty gender diversity, can be conveyed through this format that is useful for women medical students interested in orthopedic surgery to address their concerns about the field.

13.
Am J Physiol Gastrointest Liver Physiol ; 302(12): G1405-15, 2012 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-22517765

RESUMO

Butyrate, an intestinal microbiota metabolite of dietary fiber, has been shown to exhibit protective effects toward inflammatory diseases such as ulcerative colitis (UC) and inflammation-mediated colorectal cancer. Recent studies have shown that chronic IFN-γ signaling plays an essential role in inflammation-mediated colorectal cancer development in vivo, whereas genome-wide association studies have linked human UC risk loci to IFNG, the gene that encodes IFN-γ. However, the molecular mechanisms underlying the butyrate-IFN-γ-colonic inflammation axis are not well defined. Here we showed that colonic mucosa from patients with UC exhibit increased signal transducer and activator of transcription 1 (STAT1) activation, and this STAT1 hyperactivation is correlated with increased T cell infiltration. Butyrate treatment-induced apoptosis of wild-type T cells but not Fas-deficient (Fas(lpr)) or FasL-deficient (Fas(gld)) T cells, revealing a potential role of Fas-mediated apoptosis of T cells as a mechanism of butyrate function. Histone deacetylase 1 (HDAC1) was found to bind to the Fas promoter in T cells, and butyrate inhibits HDAC1 activity to induce Fas promoter hyperacetylation and Fas upregulation in T cells. Knocking down gpr109a or slc5a8, the genes that encode for receptor and transporter of butyrate, respectively, resulted in altered expression of genes related to multiple inflammatory signaling pathways, including inducible nitric oxide synthase (iNOS), in mouse colonic epithelial cells in vivo. Butyrate effectively inhibited IFN-γ-induced STAT1 activation, resulting in inhibition of iNOS upregulation in human colon epithelial and carcinoma cells in vitro. Our data thus suggest that butyrate delivers a double-hit: induction of T cell apoptosis to eliminate the source of inflammation and suppression of IFN-γ-mediated inflammation in colonic epithelial cells, to suppress colonic inflammation.


Assuntos
Apoptose/efeitos dos fármacos , Butiratos/farmacologia , Colo/efeitos dos fármacos , Histona Desacetilase 1/metabolismo , Linfócitos T/efeitos dos fármacos , Regulação para Cima/efeitos dos fármacos , Receptor fas/metabolismo , Acetilação , Animais , Linhagem Celular , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Colo/metabolismo , Colo/patologia , Humanos , Inflamação/metabolismo , Inflamação/patologia , Interferon gama/metabolismo , Mucosa Intestinal/efeitos dos fármacos , Mucosa Intestinal/metabolismo , Mucosa Intestinal/patologia , Camundongos , Regiões Promotoras Genéticas , Transdução de Sinais/efeitos dos fármacos , Linfócitos T/metabolismo , Linfócitos T/patologia
14.
Exp Ther Med ; 22(5): 1295, 2021 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-34630650

RESUMO

Glutamate-induced excitotoxicity is a well-recognized cause of neuronal cell death. Nutritional supplementation with Coenzyme Q10 (CoQ10) has been previously demonstrated to serve neuro-protective effects against glutamate-induced excitotoxicity. The aim of the present study was to determine whether the protective effect of CoQ10 against glutamate toxicity could be attributed to stimulating mitochondrial biogenesis. Mouse hippocampal neuronal HT22 cells were incubated with glutamate with or without ubisol Q10. The results revealed that glutamate significantly decreased levels of mitochondrial biogenesis related proteins, including peroxisome proliferator-activated receptor gamma coactivator (PGC)-1α and nuclear respiratory factor (NRF)2. Additionally, glutamate reduced mitochondrial biogenesis, as determined using a mitochondrial biogenesis kit. Pretreatment with CoQ10 prevented decreases in phosphorylated (p)-Akt, p-cAMP response element-binding protein, PGC-1α, NRF2 and mitochondrial transcription factor A, increasing mitochondrial biogenesis. Taken together, the results described a novel mechanism of CoQ10-induced neuroprotection and indicated a central role for mitochondrial biogenesis in protecting against glutamate-induced excitotoxicity.

15.
Qual Health Res ; 20(8): 1101-15, 2010 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-20448273

RESUMO

In this article, we analyze the process of redefining marital relations within the context of couples dealing with Alzheimer's disease and related disorders (ADRDs), drawing on intensive interviews with 13 caregiver husbands and 15 caregiver wives. Men were slower to recognize the symptoms of ADRDs, with social others usually bringing the problems to their attention. They often attributed symptoms to a less-problematic cause and engaged in extended normalization of their wife's condition. Women were quicker to recognize symptoms and often noticed subtle changes in their husbands but failed to take action quickly. They were reluctant to disclose their concerns to their impaired husbands, which might have protected the husband's masculine identity and served to maintain the wife's own sense of self in relation to him. We suggest that husbands were able to normalize because the wife's symptoms did not change marital authority dynamics, but authority relations were reversed by the illness for caregiver wives.


Assuntos
Doença de Alzheimer/diagnóstico , Fatores Sexuais , Cônjuges/psicologia , Revelação da Verdade , Adaptação Psicológica , Idoso , Idoso de 80 Anos ou mais , Doença de Alzheimer/psicologia , Conscientização , Cuidadores/psicologia , Feminino , Grupos Focais , Comportamentos Relacionados com a Saúde , Educação em Saúde , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Relações Interpessoais , Entrevista Psicológica , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Apoio Social , Estresse Psicológico , Gravação em Fita
16.
Pediatr Blood Cancer ; 53(3): 343-7, 2009 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-19422022

RESUMO

BACKGROUND: Abnormal expression of A-PROTEIN has been identified in a number of tumors including carcinoma of the lung, breast, colon, prostate, and cervix. Brain tumors have been reported to express high plasma levels of A-PROTEIN, suggesting that it may be of significant diagnostic and prognostic value. PROCEDURE: This prospective study evaluated the sensitivity and specificity of A-PROTEIN levels in pediatric brain tumor patients. Patients included those with newly diagnosed disease pre- and post-surgery, during treatment, during routine follow-up, and at recurrence or progression. A total of 154 A-PROTEIN levels from 54 patients were evaluated. RESULTS: For patients without evidence of disease, 42% had normal A-PROTEIN levels, 35% were elevated, and 23% were equivocal. For patients with stable disease, 53% demonstrated normal A-PROTEIN levels, 19% were elevated, and 28% were equivocal. For patients with progressive disease, 53% had normal A-PROTEIN levels, 35% were elevated, and 12% were equivocal. The sensitivity was 35% and the specificity was 50%. A correlation of increased A-PROTEIN levels in patients with increased disease in glial tumors was also identified. CONCLUSIONS: A-PROTEIN levels were not predictive of disease status in children with most brain tumors. However, in patients with glial tumors there was a correlation with increased disease and elevated A-PROTEIN levels. This could represent variability of A-PROTEIN during growth, development, or tumor cell origin and needs further evaluation.


Assuntos
Neoplasias Encefálicas/sangue , Recoverina/sangue , Biomarcadores Tumorais/sangue , Criança , Humanos , Estudos Prospectivos , Sensibilidade e Especificidade
19.
Disabil Health J ; 10(3): 419-425, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28487170

RESUMO

BACKGROUND: Women with disabilities report fewer pregnancies than those without disabilities. OBJECTIVE: To explore the range of factors involved in pregnancy decision-making among women with disabilities, and give insight into the decision making process. METHODS: Data were obtained from 4 focus groups conducted with 22 women of child-bearing age, who had a chronic physical or mental health condition or disability that influenced their pregnancy decisions. Group transcripts were analyzed using conventional content analysis to identify the types of factors that influence pregnancy decisions and themes related to pregnancy decision-making. RESULTS: Most had a strong desire for motherhood, although there were varied decisions and some ambivalence over whether or not to attempt pregnancy. Decisions were influenced by an interplay of biomedical, social and personal factors that shaped assessments of three key areas of consideration: importance, feasibility, and costs of pregnancy/motherhood. CONCLUSIONS: It is not just the 'biomedical facts' of health conditions that are relevant, but rather the meaning attributed to these facts and how they are weighed in relation to other significant non-medical factors. By moving beyond the medical model of disability to recognize the importance of social and personal factors, and engaging in patient-centered communication, healthcare providers can facilitate pregnancy decision-making that is consistent with the values and preferences of women with disabilities and improve quality of care and support. In order to make motherhood a more viable option for women with disabilities, societal attitudes and a lack of role models for these women also need to be addressed.


Assuntos
Tomada de Decisões , Pessoas com Deficiência/psicologia , Pessoas com Deficiência/estatística & dados numéricos , Mães/estatística & dados numéricos , Comportamento Reprodutivo/psicologia , Comportamento Reprodutivo/estatística & dados numéricos , Adolescente , Adulto , Feminino , Grupos Focais , Humanos , Entrevistas como Assunto , Kansas , Mães/psicologia , Gravidez , Adulto Jovem
20.
J Health Care Poor Underserved ; 28(1): 46-57, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28238985

RESUMO

The Marketplace Coverage Initiative (MCI) sought to expand awareness and ACA Marketplace enrollment in the greater Kansas City Area. The MCI was evaluated through interviews, surveys, and focus groups. Two main findings are particularly relevant for future Marketplace enrollment efforts. First, the link between contacting someone and actual enrollment is tenuous as follow-up is challenging. Outreach efforts that only track contacts, such as appointments and email addresses, lack information needed to assess enrollment. Linking outreach activities to enrollment outcomes leads us to a dramatically different conclusion about using big data and campaign-style tactics than evaluations of similar techniques such as that pioneered by Enroll America in 11 states. Second, there is a large chasm between the knowledge levels of the uninsured and the decisions they face on the Marketplace. Based on these findings, outreach efforts were redesigned for the 2014 open enrollment period to focus on smaller, community-driven projects.


Assuntos
Trocas de Seguro de Saúde/organização & administração , Trocas de Seguro de Saúde/estatística & dados numéricos , Pessoas sem Cobertura de Seguro de Saúde/estatística & dados numéricos , Patient Protection and Affordable Care Act/organização & administração , Patient Protection and Affordable Care Act/estatística & dados numéricos , Humanos , Kansas , Conhecimento , Avaliação de Programas e Projetos de Saúde , Estados Unidos
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