A cervical cancer tissue-derived decellularized extracellular matrix scaffold for cervical cancer tissue reconstruction in vitro / 南方医科大学学报

OBJECTIVE@#The prepare decellularized extracellular matrix (ECM) scaffold materials derived from human cervical carcinoma tissues for 3D culture of cervical carcinoma cells.@*METHODS@#Fresh human cervical carcinoma tissues were treated with sodium lauryl ether sulfate (SLES) solution to prepare decellularized ECM scaffolds. The scaffolds were examined for ECM microstructure and residual contents of key ECM components (collagen, glycosaminoglycan, and elastin) and genetic materials by pathological staining and biochemical content analysis. In vitro 3D culture models were established by injecting cultured cervical cancer cells into the prepared ECM scaffolds. The cells in the recellularized scaffolds were compared with those in a conventional 2D culture system for cell behaviors including migration, proliferation and epithelial-mesenchymal transition (EMT) wsing HE staining, immunohistochemical staining and molecular biological technology analysis. Resistance to 5-fluorouracil (5-Fu) of the cells in the two culture systems was tested by analyzing the cell apoptosis rates via flow cytometry.@*RESULTS@#SLES treatment effectively removed cells and genetic materials from human cervical carcinoma tissues but well preserved the microenvironment structure and biological activity of ECM. Compared with the 2D culture system, the 3D culture models significantly promoted proliferation, migration, EMT and 5-Fu resistance of human cervical cancer cells.@*CONCLUSION@#The decellularized ECM scaffolds prepared using human cervical carcinoma tissues provide the basis for construction of in vitro 3D culture models for human cervical cancer cells.

Hydroxysafflor yellow A inhibits proliferation, migration, and chemoresistance of colorectal cancer cells through Akt/mTOR-autophagy pathway / 中国中药杂志

In recent years, the clinical treatment of colorectal cancer(CRC) has made great progress, but chemoresistance is still one of the main reasons for reducing the survival rate of patients with colorectal cancer. Therefore, ameliorating chemotherapy resis-tance is an urgent problem to be solved. The purpose of this study was to investigate the regulatory role and related molecular mechanisms of hydroxysafflor yellow A(HSYA) in colorectal cancer cell proliferation, migration, and 5-fluorouracil(5-FU) chemoresistance. In this study, HCT116 and HT-29 cells were used as research subjects. Firstly, methyl thiazolyl tetrazolium(MTT) assay and colony formation assay were used to detect and analyze the effect of HSYA on the proliferation of CRC cells. Secondly, the effect of HSYA on the cell cycle in CRC cells was analyzed by cell cycle assay. Furthermore, the effect of HSYA on the migration of CRC cells was analyzed by wound-healing assay and Transwell assay. Based on the above, the influences of HSYA on 5-FU chemoresistance of CRC cells and related molecular mechanisms were explored and analyzed. The results showed that HSYA significantly inhibited the proliferation and migration of CRC cells, and arrested the cell cycle in G_0/G_1 phase. In addition, HSYA significantly ameliorated the chemoresistance of CRC cells to 5-FU. The results of acridine orange staining and Western blot showed that the autophagy activity of CRC cells in the HSYA and 5-FU combined treatment group was significantly higher than that in the 5-FU single drug treatment group. As compared with the 5-FU single drug treatment group, the phosphorylation levels of protein kinase B(Akt) and mammalian target of rapamycin(mTOR) in the HSYA and 5-FU combined treatment group were significantly reduced, indicating that the Akt/mTOR signaling pathway in the combined treatment group was down-regulated in CRC cells. In conclusion, HSYA may upregulate autophagy activity through the Akt/mTOR signaling pathway, thereby inhibiting the proliferation and migration of CRC cells and ameliorating the chemoresistance to 5-FU.

The efficacy and side effects of rigosertib combined with chemotherapy in KRAS mutant colorectal cancer mice / 中华肿瘤杂志

Objective: To investigate the effect of rigosertib (RGS) combined with classic chemotherapy drugs including 5-fluorouracil, oxaliplatin, and irinotecan in colorectal cancer. Methods: Explore the synergy effects of RGS and 5-fluorouracil (5-FU), oxaliplatin (OXA), and irinotecan (IRI) on colorectal cancer by subcutaneously transplanted tumor models of mice. The mice were randomly divided into control group, RGS group, 5-FU group, OXA group, IRI group, 5-FU+ RGS group, OXA+ RGS group and IRI+ RGS group. The synergy effects of RGS and OXA on KRAS mutant colorectal cancer cell lines in vitro was detected by CCK-8. Ki-67 immunohistochemistry and TdT-mediated dUTP nick-end labeling (TUNEL) staining were performed on the mouse tumor tissue sections, and the extracted tumor tissue was analyzed by western blot. The blood samples of mice after chemotherapy and RGS treatment were collected, blood routine and liver and kidney function analysis were conducted, and H&E staining on liver sections was performed to observe the side effects of chemotherapy and RGS. Results: The subcutaneously transplanted tumor models were established successfully in all groups. 55 days after administration, the fold change of tumor size of OXA+ RGS group was 37.019±8.634, which is significantly smaller than 77.571±15.387 of RGS group (P=0.029) and 92.500±13.279 of OXA group (P=0.008). Immunohistochemical staining showed that the Ki-67 index of tumor tissue in control group, OXA group, RGS group and OXA+ RGS group were (100.0±16.8)%, (35.6±11.3)%, (54.5±18.1)% and (15.4±3.9)%, respectively. The Ki-67 index of OXA+ RGS group was significantly lower than that in control group (P=0.014), but there was no significant difference compared to OXA group and RGS group (OXA: P=0.549; RGS: P=0.218). TUNEL fluorescence staining showed that the apoptotic level of OXA+ RGS group was 3.878±0.547, which was significantly higher than 1.515±0.442 of OXA group (P=0.005) and 1.966±0.261 of RGS group (P=0.008). Western blot showed that the expressions of apoptosis related proteins such as cleaved-PARP, cleaved-caspase 3 and cleaved-caspase 8 in the tumor tissues of mice in the OXA+ RGS group were higher than those in control group, OXA group and RGS group. After the mice received RGS combined with chemotherapy drugs, there was no significant effect on liver and kidney function indexes, but the combined use of oxaliplatin and RGS significantly reduced the white blood cells [(0.385±0.215)×10(9)/L vs (5.598±0.605)×10(9)/L, P<0.001] and hemoglobin[(56.000±24.000)g/L vs (153.333±2.231)g/L, P=0.001] of the mice. RGS, chemotherapy combined with RGS and chemotherapy alone did not significantly increase the damage to liver cells. Conclusions: The combination of RGS and oxaliplatin has a stronger anti-tumor effect on KRAS mutant colorectal cancer. RGS single agent will not cause significant bone marrow suppression and hepatorenal injury in mice, but its side effects may increase correspondingly after combined with chemotherapy.

Influence of 6-shogaol potentiated on 5-fluorouracil treatment of liver cancer by promoting apoptosis and cell cycle arrest by regulating AKT/mTOR/MRP1 signalling / 中国天然药物

Currently, chemoresistance seriously attenuates the curative outcome of liver cancer. The purpose of our work was to investigate the influence of 6-shogaol on the inhibition of 5-fluorouracil (5-FU) in liver cancer. The cell viability of cancer cells was determined by MTT assay. Liver cancer cell apoptosis and the cell cycle were examined utilizing flow cytometry. Moreover, qRT-PCR and western blotting was used to analyse the mRNA and protein expression levels, respectively. Immunohistochemistry assays were used to examine multidrug resistance protein 1 (MRP1) expression in tumour tissues. In liver cancer cells, we found that 6-shogaol-5-FU combination treatment inhibited cell viability, facilitated G0/G1 cell cycle arrest, and accelerated apoptosis compared with 6-shogaol or 5-FU treatment alone. In cancer cells cotreated with 6-shogaol and 5-FU, AKT/mTOR pathway- and cell cycle-related protein expression levels were inhibited, and MRP1 expression was downregulated. AKT activation or MRP1 increase reversed the influence of combination treatment on liver cancer cell viability, apoptosis and cell cycle arrest. The inhibition of AKT activation to the anticancer effect of 6-shogaol-5-FU could be reversed by MRP1 silencing. Moreover, our results showed that 6-shogaol-5-FU combination treatment notably inhibited tumour growth in vivo. In summary, our data demonstrated that 6-shogaol contributed to the curative outcome of 5-FU in liver cancer by inhibiting the AKT/mTOR/MRP1 signalling pathway.

Effect of Astragali Radix-Curcumae Rhizoma compatibility combined with 5-fluorouracil on Th17/Treg balance and tumor-related mRNA and protein expression in orthotopic xenograft model mice of CT26.WT colorectal carcinoma / 中国中药杂志

Astragali Radix-Curcumae Rhizoma(AR-CR) is a combination commonly used in the clinical treatment of tumors. Based on the T helper 17(Th17)/regulatory T cell(Treg) balance, the present study explored the possible mechanism of AR-CR combined with 5-fluorouracil(5-FU) on the tumor growth of orthotopic xenograft model mice of colorectal carcinoma. Ninety male BALB/c mice were randomly divided into nine groups, i.e., a blank group, a model group, a 5-FU group, high-, medium-, and low-dose AR-CR(2∶1) groups, and high-, medium-, and low-dose AR-CR+5-FU groups, with 10 mice in each group. The orthotopic xenograft model of CT26.WT colorectal carcinoma was induced in mice except those in the blank group. Twenty-four hours after the ope-ration, mice in the blank group and the model group received normal saline by gavage(10 mL·kg~(-1), once per day), and those in the 5-FU group received 5-FU by intraperitoneal injection(25 mg·kg~(-1), once every other day). Mice in the AR-CR groups received AR and CR decoctions by gavage(12, 6, and 3 g·kg~(-1), once a day) and those in the combination groups received AR and CR decoctions and 5-FU(doses and administration methods were the same as above). After intervention for three weeks, all mice were sacrificed and tumor tissues were collected. The tumor mass was weighed and the average tumor weight was calculated. The changing trend of Th17/Treg(%) in the CD4~+T lymphocytes of the spleen tissues of the mice in each group was detected. The mRNA expression in the blood and protein expression in the tumor tissues of transforming growth factor-β(TGF-β), tumor necrosis factor-α(TNF-α), interferon-γ(IFN-γ), Smad4, N-cadherin, matrix metalloproteinase-7(MMP-7) were detected. The experimental results revealed that compared with the model group, the groups with drug intervention showed reduced tumor mass(P<0.01), decreased CD4~+IL-17~+ in the spleen tissues to varying degrees(P<0.001), and increased proportion of CD4~+Foxp3~+(P<0.001 or P<0.05), indicating that Th17/Treg maintained dynamic balance, and the effect of the combination groups was predominant. Additionally, the mRNA expression in the blood and protein expression in the tumor tissues of TGF-β, TNF-α, IFN-γ, Smad4, N-cadherin, and MMP-7 declined to varying degrees in a dose-dependent manner(P<0.01 or P<0.001). The AR-CR combined with 5-FU can inhibit the tumor growth of orthotopic xenograft model mice of CT26.WT colorectal carcinoma. The mechanism may be related to maintenance of Th17/Treg dynamic balance in the body and down-regulation of TGF-β, TNF-α, IFN-γ, Smad4, N-cadherin, and MMP-7 expression.

Chemical composition, antiproliferative and antioxidant attributes of ethanolic extract of resinous sediment from Etlingera elatior (Jack. ) inflorescence

The ethanolic extract of resinous sediment (EERS) of Etlingera elatior young inflorescence was examined for its anticancer effect and potential antioxidant activity. The anticancer effect of the EERS was evaluated on four human cancer cell lines, HCT 116, HT-29, Hela, and MCF-7, using the MTT assay. GC-MS analysis showed that the main components found in the EERS were nonyl cyclopropane (4.44%), 1-tetradecane (3.66%), cyclotetradecane (2.41%), cyclododecane (1.92%), and 1-decene (1.72%). The antioxidant activity was determined through different methods. High amounts of TPC and TFC in the EERS were found. Moderate antioxidant capacity of the EERS was detected by DPPH and ABTS assays, with EC50 values of 44.19 and 56.61 µg/mL and a high FRAP value of 281.79 nmol Fe+2 equivalent/mg extract. In the MTT assay, the EERS showed potent anticancer activity, with IC50 values of 19.82, 37.001, 50.49, and 53.29 µg/mL against HT-29, HCT 116, Hela, and MCF-7 tumour cell lines, respectively. Moreover, the results were comparable to or less potent than the standard reference drug, 5-fluorouracil. The results showed that the EERS of Etlingera elatior inflorescence contained a high amount of polyphenols and flavonoids, which may to the selective antiproliferative effects towards colon cancer in vitro

Expression of Runt-related Transcription Factor 3 in Human Colon Cancer Cell Line HCT-116 Resistant to 5-Fluorouracil and the Mechanism of Drug Resistance / 中国医学科学院学报

Objective To establish a human colon cancer cell line HCT-116/5-FU resistant to 5-fluorouracil(5-FU)and explore the relationship between runt-related transcription factor 3(RUNX3)and drug resistance of colorectal cancer.Methods The human colon cancer cell line HCT-116/5-FU with resistance to 5-FU was established by low concentration gradient increment combined with high-dose intermittent shock.CCK-8 method was used to determine the half maximal inhibitory concentration(IC

Retrieval of Trichostrongylus colubriformis infective larvae from grass contaminated in winter and in spring / Recuperação de larvas infectantes de Trichostrongylus colubriformis em gramíneas contaminadas no inverno e na primavera

The survival of infective larvae (L3) of Trichostrongylus colubriformis was evaluated on Brachiaria, Coast-cross and Aruana forage grasses. Feces of sheep parasitized exclusively by T. colubriformis were deposited in winter and spring on experimental plots whose grasses were cut at two heights: 5 cm and 30 cm. One, two, four, eight, 12 and 16 weeks after depositing the feces, fecal and forage samples were collected for the retrieval and quantification of L3. Retrieval of L3 from feces and forage was negligible in winter due to the dry weather, although a few larvae were retrieved in the last larval collections. However, L3 retrieval from fecal samples was greater in spring, especially two weeks after feces were deposited on 30 cm high grasses. At this time, the L3 retrieval rate from the three forage grasses differed significantly (P <0.05), with Aruana grass showing the highest average L3 retrieval rate, followed by Coast-cross and Brachiaria. In conclusion, the winter drought proved very unfavorable for the presence of L3 in the environment, and the microclimate of Aruana pastureland was generally the most favorable for the retrieval of infective larvae.

A sobrevivência de larvas infectantes (L3) de Trichostrongylus colubriformis foi avaliada em pastagem de Braquiária, Coast-cross e Aruana. Fezes de ovinos parasitados exclusivamente por T. colubriformis foram depositadas no inverno e na primavera em parcelas experimentais com duas alturas de corte da forragem, 5 cm e 30 cm. Uma, duas, quatro, oito, 12 e 16 semanas após o depósito, amostras de fezes e de forragem foram coletadas para a recuperação e quantificação de L3. Devido à seca no inverno, a recuperação de L3 das fezes e da forragem foi ínfima, embora tenha havido recuperação de algumas larvas nas últimas coletas. Por outro lado, na primavera houve maior recuperação de L3 das amostras, especialmente duas semanas após a deposição das fezes em meio às pastagens com 30 cm de altura. Nesse momento, houve diferença significativa (P<0,05) entre as três forrageiras, com maior média de L3 no capim Aruana, seguido de Coast-cross e Braquiária. Em conclusão, a seca registrada no período de inverno se mostrou bastante desfavorável à presença de L3 no ambiente e, de forma geral, o microclima da pastagem de Aruana foi o que mais favoreceu a recuperação de larvas infectantes.

Adenosina trifosfato bioluminescência para avaliação da limpeza de superfícies: uma revisão integrativa / Adenosine triphosphate bioluminescence to evaluate the effectiveness of surface cleaning: an integrative review / Bioluminiscencia adenosina trifosfato para evaluar la eficacia de la limpieza de superficies: una revisión integrativa

Objetivo: Identificar na literatura indicações e controvérsias do ATP bioluminescência para avaliação da efetividade da limpeza de superfícies em estabelecimentos de saúde. Método: Revisão integrativa da literatura, entre 2000 e 2012, nas bases de dados MEDLINE, LILACS, Science Direct, SCOPUS e Isi Web of Knowledge. Resultados: Selecionou-se para esta revisão 15 artigos. O ATP bioluminescência foi apontado como importante recurso educacional e método complementar à inspeção visual e às análises microbiológicas na avaliação da efetividade da limpeza. A impossibilidade de indicar a contaminação da superfície por micro-organismos viáveis, a interferência por substâncias químicas e a dificuldade de interpretação dos resultados constituem as principais controvérsias para o uso deste nos serviços de saúde. Conclusão: Apesar de constituir importante recurso na avaliação da limpeza de superfícies, mais estudos são necessários para incorporação efetiva do método nos serviços de saúde. .

Objective: To identify indications and controversies in the literature of the use of ATP bioluminescence to evaluate the effectiveness of surface cleaning in healthcare facilities. Method: Integrative literature review between 2000 and 2012 in the following databases: MEDLINE, LILACS, Science Direct, SCOPUS and Isi Web of Knowledge. Results: were selected for this review 15 articles. The ATP bioluminescence was considered an important educational resource and complementary method to visual inspection and microbiological evaluation of the effectiveness of cleaning. The impossibility to indicate surface contamination by microorganisms, interference by chemicals and the difficulty of interpreting the results constitute the main controversies in the use of ATP in health services. Conclusion: Although this is an important resource in the evaluation of surface cleaning, more studies are necessary for effective incorporation of the method in health services. .

Objetivo: Identificar en la literatura las indicaciones y controversias sobre el uso de la bioluminiscencia ATP para evaluar la eficacia de la limpieza de superficies en los servicios de salud. Método: Revisión integrativa de la literatura, entre 2000 y 2012, en las siguientes bases de datos: MEDLINE, LILACS, Science Direct, SCOPUS e ISI Web of Knowledge. Resultados: Se seleccionaron para esta revisión 15 artículos. La bioluminiscencia del ATP se considera un importante recurso educativo y método complementario a la inspección visual y la análisis microbiológica de la evaluación de la efectividad de la limpieza. La imposibilidad de indicar contaminación de la superficie por los microorganismos, la interferencia por los productos químicos y la dificultad de interpretar los resultados constituyen las principales controversias en la utilización de ATP en los servicios de salud. Conclusión: Aunque esto es un elemento importante en la evaluación de limpieza de superficies, se necesitan más estudios para incorporación eficaz del método en los servicios de salud. .

Ziyuglycoside II-induced apoptosis in human gastric carcinoma BGC-823 cells by regulating Bax/Bcl-2 expression and activating caspase-3 pathway

Ziyuglycoside II is an active compound of Sanguisorba officinalis L. that has anti-inflammation, antioxidation, antibiosis, and homeostasis properties. We report here on the anticancer effect of ziyuglycoside II on human gastric carcinoma BGC-823 cells. We investigated the effects of ziyuglycoside II on cell growth, cell cycle, and cell apoptosis of this cell line. Our results revealed that ziyuglycoside II could inhibit the proliferation of BGC-823 cells by inducing apoptosis but not cell cycle arrest, which was associated with regulation of Bax/Bcl-2 expression, and activation of the caspase-3 pathway. Our study is the first to report the antitumor potential of ziyuglycoside II in BGC-823 gastric cancer cells. Ziyuglycoside II may become a potential therapeutic agent against gastric cancer in the future.

Identification of microRNAs and mRNAs associated with multidrug resistance of human laryngeal cancer Hep-2 cells

Multidrug resistance (MDR) poses a serious impediment to the success of chemotherapy for laryngeal cancer. To identify microRNAs and mRNAs associated with MDR of human laryngeal cancer Hep-2 cells, we developed a multidrug-resistant human laryngeal cancer subline, designated Hep-2/v, by exposing Hep-2 cells to stepwise increasing concentrations of vincristine (0.02-0.96'µM). Microarray assays were performed to compare the microRNA and mRNA expression profiles of Hep-2 and Hep-2/v cells. Compared to Hep-2 cells, Hep-2/v cells were more resistant to chemotherapy drugs (∼45-fold more resistant to vincristine, 5.1-fold more resistant to cisplatin, and 5.6-fold more resistant to 5-fluorouracil) and had a longer doubling time (42.33±1.76 vs 28.75±1.12'h, P<0.05), higher percentage of cells in G0/G1 phase (80.98±0.52 vs 69.14±0.89, P<0.05), increased efflux of rhodamine 123 (95.97±0.56 vs 12.40±0.44%, P<0.01), and up-regulated MDR1 expression. A total of 7 microRNAs and 605 mRNAs were differentially expressed between the two cell types. Of the differentially expressed mRNAs identified, regulator of G-protein signaling 10, high-temperature requirement protein A1, and nuclear protein 1 were found to be the putative targets of the differentially expressed microRNAs identified. These findings may open a new avenue for clarifying the mechanisms responsible for MDR in laryngeal cancer.

Retrovirus-mediated transduction of a cytosine deaminase gene preserves the stemness of mesenchymal stem cells

Human mesenchymal stem cells (MSCs) have emerged as attractive cellular vehicles to deliver therapeutic genes for ex-vivo therapy of diverse diseases; this is, in part, because they have the capability to migrate into tumor or lesion sites. Previously, we showed that MSCs could be utilized to deliver a bacterial cytosine deaminase (CD) suicide gene to brain tumors. Here we assessed whether transduction with a retroviral vector encoding CD gene altered the stem cell property of MSCs. MSCs were transduced at passage 1 and cultivated up to passage 11. We found that proliferation and differentiation potentials, chromosomal stability and surface antigenicity of MSCs were not altered by retroviral transduction. The results indicate that retroviral vectors can be safely utilized for delivery of suicide genes to MSCs for ex-vivo therapy. We also found that a single retroviral transduction was sufficient for sustainable expression up to passage 10. The persistent expression of the transduced gene indicates that transduced MSCs provide a tractable and manageable approach for potential use in allogeneic transplantation.

Functional impairment in submandibular gland of rats induced by 5-fluorouracil and calcium leucovorin

One of the main clinical problems during chemotherapy is the occurrence of severe systemic toxicities, including those related to the stomatognathic system, which contribute to reducing the patient's quality of life. The most frequent oral complications are mucositis, dysgeusia, inflammation, gingival bleeding and decreased salivary flow or hyposalivation, a factor that predisposes to xerostomia, and other local complications that alter the homeostasis of the system. The purpose of this study was to evaluate the functional activity of salivary glands in Wistar rats subject to chemotherapy by measuring salivary flow, glycogen levels and glandular tissue response to autonomic nervous system agonists. Five experimental groups were used: 1) Control group fed "ad libitum"; 2) 5-fluorouracil (20mg/ kg body weight); 3) Calcium leucovorin (10 mg/kg body weight); 4) 5-fluorouracil + calcium leucovorin (20 and 10 mg / kg, respectively) by intraperitoneal injection for five consecutive days and 5) control with paired diet. Groups 1 and 5 did not receive drugs. Treatment with fluorouracil + leucovorin produced an increase in stimulated salivary flow and a higher response to increasing doses of beta agonists compared to other experimental groups. In both groups treated with cytostatic drugs, blocking of glycogen consumption at the end of the experimental period was observed. Our work suggests that salivary secretion may be affected by a dual mechanism: the first would be toxicity induced by 5-FU, which would cause depression of the process of glucose utilization. The second mechanism would affect the sympathetic autonomic reflex arc. In this instance, the synergistic action of 5-FU + LV would have a negative effect on the nerve activity with a reduction of salivary secretion. This would explain the hyposalivation, cited by several authors in patients undergoing the 5-FU+LV scheme in the treatment of colon carcinoma.

Uno de los principales problemas clinicos durante la quimioterapia es la aparicion de graves efectos toxicos sistemicos, incluidos los relacionados con el sistema estomatognatico, que contribuyen a la reduccion de la calidad de vida del paciente. Las complicaciones orales mas frecuentes son la mucositis, disgeusia, inflamacion, sangrado gingival y la disminucion del flujo salival o hiposalivacion, un factor que predispone a la xerostomia, y otras complicaciones locales que alteran la homeostasis del sistema. El objetivo de este estudio fue evaluar la actividad funcional de las glandulas salivales de ratas Wistar sometidas a quimioterapia, a traves de la medicion del flujo salival, los niveles de glucogeno y la respuesta del tejido glandular a agonistas del sistema nervioso autonomo. Se utilizaron cinco grupos experimentales: 1) Control con alimentacion "ad libitum"; 2) 5 - fluorouracilo (20 mg / kg de peso corporal); 3) Leucovorina calcica (10 mg/ kg de peso corporal); 4) 5 - fluorouracilo + leucovorina calcica (20 y 10 mg / kg, respectivamente) por via intraperitoneal durante cinco dias consecutivos, y 5) control con dieta apareada. Grupos 1 y 5 no recibieron drogas. El tratamiento con 5 - fluorouracilo + leucovorina produjo un aumento de flujo salival estimulado y una mayor respuesta a dosis crecientes de agonistas beta en comparacion con otros grupos experimentales. En ambos grupos tratados con citostaticos, se observo bloqueo del consumo de glucogeno al final del periodo. Nuestro trabajo sugiere que la secrecion salival puede estar afectada por un doble mecanismo: el primero seria la toxicidad inducida por 5-FU que causaria depresion del proceso de utilizacion de la glucosa. El segundo mecanismo afectaria el arco reflejo autonomo simpatico. En este caso, la accion sinergica de ambos farmacos de 5-FU + LV repercutiria negativamente sobre la actividad nerviosa con una reduccion de la secrecion salival. Esto explicaria la hiposalivacion citada por varios autores en pacientes sometidos al esquema 5-FU + LV en el tratamiento del carcinoma colorrectal.

Cardiotoxicidade e quimioterapia / Cardiotoxicity and chemotherapy

JUSTIFICATIVA E OBJETIVOS: Muitos esquemas de quimioterapia são relacionados a efeitos cardiotóxicos, particularmente no seguimento em longo prazo. A avaliação cardiológica é necessária, mas o treinamento específico neste campo em particular é escasso. O objetivo deste estudo foi apresentar os mecanismos de ação e efeitos adversos, principalmente cardíacos, de diferentes fármacos usados frequentemente em oncologia. CONTEÚDO: Recomendações gerais para prevenção, diagnóstico precoce e estratégias terapêuticas serão discutidas. CONCLUSÃO: Pesquisas adicionais são necessárias para desenvolver novas estratégias de prevenção e tratamento das principais complicações.

En bloc Resection for Right Colon Cancer Directly Invading Duodenum or Pancreatic Head

PURPOSE: We undertook this study to analyze clinical features and surgical outcome of en bloc resections of the right side colon cancer directly invading duodenum and/or pancreatic head. MATERIALS AND METHODS: The records of all patients who underwent en bloc resection of duodenum and/or pancreas for right colon cancers were analyzed retrospectively. From September 1994 to September 2006, 1,016 patients underwent curative right hemicolectomy. Nine patients (0.9%) had en bloc resection of a right side colon cancer with duodenum or pancreatic head invasion. RESULTS: The median operative time was 320 minutes (range, 200-420) and the median blood loss was 700 mL (range, 100-2,000). The mean size of tumor was 6.6 cm (range, 3.2-10.7). The mean preoperative carcinoembryonic antigen (CEA) was 10.6 ng/mL (range, 0.2-50.8). There was no 30 day perioperative mortality. The median disease-free survival was 23.5 months [95% confidence interval (CI) 5.2-41.8] and the median overall survival was 28.1 months (95% CI 9.7-46.5). CONCLUSIONS: In patients with locally advanced right side colon cancer that directly invades the duodenum or pancreas can be safely resected with curative potential with minimum morbidity and mortality. Long term disease free survival can occur in a significant number of patients undergoing curative en bloc resection in this particular subset of patients.

In vitro chemosensitivity profile of oral squamous cell cancer and its correlation with clinical response to chemotherapy.

CONTEXT: Oral cancers represent a disparate group of tumors with diverse clinical behavior and chemosensitivity profile. Currently, it is difficult to predict whether a tumor will respond to chemotherapy and which drug(s) will achieve the maximum clinical response. AIMS: To study in vitro chemosensitivity profile of oral cancers and to correlate the in vitro chemosensitivity of oral cancer to clinical response to chemotherapy. SETTINGS AND DESIGN: Prospective study in a tertiary cancer care center. METHODS AND MATERIAL: We prospectively studied the chemosensitivity profile of 57 untreated, advanced, unresectable oral cancers to cisplatin, methotrexate, 5-fluorouracil and their combinations by using histoculture drug response assay (HDRA) and correlated them to the clinical response to chemotherapy. STATISTICAL ANALYSIS USED: Chi Square test. RESULTS: Biopsy samples were successfully histocultured in 52/57 (91%) cases. Of these 52 evaluable patients, 47 had primary gingivo-buccal cancers and five had tongue / floor of mouth cancers. Based on the assay, 27 (52%) tumors were sensitive to cisplatin, 27 (52%) to methotrexate, 24 (46%) to 5-fluorouracil, 38 (73%) to combination of cisplatin and methotrexate and 36 (69%) to combination of cisplatin and 5-fluorouracil. Of these, 31 patients with good performance status received two cycles of chemotherapy using one or more of these test drugs. There was a significant correlation (p=0.03) between the in vitro chemosensitivity and the clinical response. Negative predictive value of the test was 80%, positive predictive value-69%, sensitivity-79% and specificity -71%. The overall accuracy of the assay was 74%. CONCLUSIONS: We found HDRA to be a fairly good predictor of chemo-response of oral cancer.

Exposição de fibroblastos da cápsula de Tenon normal de portadores de pterígio ao 5-fluorouracil e à mitomicina C / Exposure of normal Tenon's capsule fibroblasts from pterygium to 5-fluorouracil and mitomycin C

OBJETIVO: Avaliar a atividade proliferativa dos fibroblastos da cápsula de Tenon normal, proveniente de portadores de pterígios primários e recidivados. MÉTODOS: Foi realizado estudo prospectivo, aleatório, avaliando-se fragmentos da cápsula de Tenon normal, removidos de 20 portadores de pterígios primários e 21, recidivados. A taxa de proliferação foi avaliada em fibroblastos de terceira passagem, quando as culturas foram expostas a agentes antimitóticos: mitomicina C e 5-fluorouracil. Os dados obtidos foram submetidos à análise estatística. RESULTADOS: Dentre os 41 espécimes cultivados, apenas 1 de pterígio primário e 2 de recidivado proliferaram. Quando expostos a mitomicina C e ao 5-fluorouracil não houve diferença estatisticamente significativa quanto a inibição de proliferação celular. CONCLUSÃO: Desta forma, in vitro, ambos os antimitóticos estudados têm a mesma eficácia na inibição da proliferação sobre os fibroblastos de cápsulas de Tenon normal.

PURPOSE: To evaluate the fibroblast proliferation activity of normal Tenon's capsule from primary and recurrent patients with pterygium. METHODS: A randomized prospective study was performed with 41 normal Tenon's capsule fragments from 21 primary and 20 recurrent patients with pterygium. The sample was collected from the inferior cul-de-sac. Proliferation rate from fibroblasts were evaluated after mitomycin C and 5-fluorouracil exposition. Data were submitted to statistical analysis. RESULTS: Of the 41 cultivated normal Tenon's capsules, only 1 from primary and 2 from recurrent pterygium patients proliferated. After antimitotic exposition, the proliferation rate was similar with both drugs. CONCLUSION: Mitomycin and 5-fluorouracil promote similar inhibition regarding proliferation of normal Tenon's fibroblast cultures.

Change of the Expression of Human Telomerase Reverse Transcriptase mRNA and Human Telomerase RNA after Cisplatin and 5-Fluorouracil Exposure in Head and Neck Squamous Cell Carcinoma Cell Lines

Telomerase activity appears to be associated with cell immortalization and malignant progression. Understanding how telomerase activity is regulated in vivo is important not only for understanding the molecular biology of telomerase but also for the potential clinical application of anticancer drugs. This study evaluated telomerase activity and quantified the expression of human telomerase reverse transcriptase (hTERT) mRNA and human telomerase RNA (hTR) using a real-time reverse transcriptase-polymerase chain reaction (RT-PCR) method before and after the exposure of cisplatin and 5-fluorouracil (5-FU) in two head and neck squamous cell carcinoma (HNSCC) cell lines. Two human HNSCC cell lines (PNUH-12 and SNU-899) were studied. Cell cytotoxicity, the change of telomerase activity, and hTERT mRNA and hTR expression by 5-FU and cisplatin exposure were assessed by MTT assay, TRAP assay, and real-time RT-PCR, respectively. In two cell lines, after cisplatin exposure, the telomerase activity and hTERT mRNA expression decreased, but hTR expression in- creased according to the concentration of drug. However, in both cell lines, the telomerase activity and hTR did not show any significant change after 5-FU treatment, but the expression of hTERT mRNA decreased. These results suggest that there may be other important regulating mechanism except hTERT mRNA as the regulation factor of telomerase activity in HNSCC cell lines.

The Inhibitory Effect of Curcumin on the Growth of Human Colon Cancer Cells (HT-29, WiDr) in vitro / 대한소화기학회지

BACKGROUND/AIMS: The effects of curcumin on the growth of human colon cancer cell lines, HT-29 and WiDr cells were examined and the effects of 5-fluorouracil (5-FU) were also studied. METHODS: The growth of HT-29 and WiDr cells were examined by counting cell number on two and four days treatment with 1-40 micrometer of curcumin, and 0.1 microgram/mL, 0.3 microgram/mL of 5-FU. The reversibility of curcumin was examined on one day to seven days treatment with 10 micrometer curcumin after seeding to 2 10(4) cells/well. To examine the inhibitory effects of curcumin, cell cycle analysis was done on the HT-29 cells after four days treatment with 20 micrometer curcumin. RESULTS: Curcumin inhibited the growth of HT-29 and WiDr cells in a dose-dependent fashion. The growth rate of the group in which curcumin was removed by media change 24 hours after the treatment of curcumin was not different from that of control group. Curcumin combined with 5-FU markedly inhibited the growth of HT-29 and WiDr cells compared to curcumin or 5-FU alone. After four days treatment of HT-29 cells with 20 micrometer curcumin, the fraction of cells in G2-M phase was 35.3% in curcumin group, much higher than 13.8% of the control group. CONCLUSIONS: Curcumin significantly inhibited the growth of HT-29 and WiDr cells in a dose- dependent, reversible fashion.

Valor preditivo da quimiosensibilidade in vitro na quimioterapia do câncer gástrico avançado / Preditive value of the chemosensitivy test in the chemoterapy for advanced gastric cancer

Racional - Existem controvérsias em relação ao emprego de quimioterapia em pacientes com câncer gástrico. No sentido de se tentar identificar os que poderiam se beneficiar com este tratamento, surgiram os testes de quimiosensibilidade. Objetivo - Avaliar a eficácia de drogas quimioterápicas através do teste in vitro, denominado MTT [3-(4,5 dimetiltiazol-2yl)-2-5-difenil-2h tetrazolato de bromo], sobre células tumorais de pacientes com câncer gástrico avançado, submetidos a tratamento cirúrgico, além de correlacionar os resultados do teste com aspectos anatomopatológicos, estágio, resposta clínica ao tratamento quimioterápico e sobrevida. Material e Métodos - O teste foi realizado em 112 pacientes com câncer gástrico avançado submetidos a tratamento cirúrgico, estudando-se in vitro as seguintes drogas: mitomicina C, doxorrubicina, cisplatina e 5-fluorouracil. Resultados - Os índices de eficácia observados foram: 12,5% para a mitomicina, 6,3% para a doxorrubicina, 13,4% para a cisplatina e 5,4% para o 5-fluorouracil. O teste demostrou sensibilidade de 86%, especificidade de 76%, valor preditivo positivo de 40%, valor preditivo negativo de 97% e acurácia de 78%, quando comparado com resultados clínicos de tratamento quimioterápico que incluía essas drogas. A ação dos quimioterápicos estudados não teve relação com idade, sexo ou estádio anatomopatológico. As células dos tumores diferenciados foram sensíveis à ação das drogas estudadas. Conclusões - No presente estudo, o teste de sensibilidade in vitro como fator preditivo da resposta à quimioterapia, parece ser eficiente em termos de sobrevida somente quando a quimioterapia é realizada em pacientes submetidos a tratamento cirúrgico curativo. Novos métodos juntamente com a descoberta de agentes quimioterápicos mais efetivos, associados à ressecção radical do tumor, poderão trazer novos horizontes para o tratamento do câncer gástrico avançado.