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1.
Am J Hypertens ; 35(1): 54-64, 2022 01 05.
Artigo em Inglês | MEDLINE | ID: mdl-34505630

RESUMO

OBJECTIVE: To address to what extent central hemodynamic measurements, improve risk stratification, and determine outcome-based diagnostic thresholds, we constructed the International Database of Central Arterial Properties for Risk Stratification (IDCARS), allowing a participant-level meta-analysis. The purpose of this article was to describe the characteristics of IDCARS participants and to highlight research perspectives. METHODS: Longitudinal or cross-sectional cohort studies with central blood pressure measured with the SphygmoCor devices and software were included. RESULTS: The database included 10,930 subjects (54.8% women; median age 46.0 years) from 13 studies in Europe, Africa, Asia, and South America. The prevalence of office hypertension was 4,446 (40.1%), of which 2,713 (61.0%) were treated, and of diabetes mellitus was 629 (5.8%). The peripheral and central systolic/diastolic blood pressure averaged 129.5/78.7 mm Hg and 118.2/79.7 mm Hg, respectively. Mean aortic pulse wave velocity was 7.3 m per seconds. Among 6,871 participants enrolled in 9 longitudinal studies, the median follow-up was 4.2 years (5th-95th percentile interval, 1.3-12.2 years). During 38,957 person-years of follow-up, 339 participants experienced a composite cardiovascular event and 212 died, 67 of cardiovascular disease. CONCLUSIONS: IDCARS will provide a unique opportunity to investigate hypotheses on central hemodynamic measurements that could not reliably be studied in individual studies. The results of these analyses might inform guidelines and be of help to clinicians involved in the management of patients with suspected or established hypertension.


Assuntos
Doenças Cardiovasculares , Hipertensão , Pressão Sanguínea/fisiologia , Doenças Cardiovasculares/diagnóstico , Doenças Cardiovasculares/epidemiologia , Estudos Transversais , Feminino , Humanos , Hipertensão/diagnóstico , Hipertensão/epidemiologia , Masculino , Pessoa de Meia-Idade , Análise de Onda de Pulso
2.
Braz J Microbiol ; 52(1): 19-31, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32772310

RESUMO

Melanin is a Sporothrix virulence factor that can inhibit the innate immune functions of macrophages such as phagocytosis and killing. However, no data on melanin's influence on antigen presentation by macrophages are available. In this study, we used conidia, yeasts, and melanin ghosts (MGs) from a black Sporothrix globosa strain (MEL+) and its ultraviolet-induced albino mutant (MEL-), to study the influence of melanin on expression of molecules involved in antigen presentation by mouse macrophages (MHC class II, CD80, CD86), as well as on levels of transcription factors regulating their expression (CIITA and promoters I, III, and IV). A murine infection model was used to assess the virulence of both strains and differences in expression of MHC class II and CD80/86 in vivo. MHC class II, CD86 CIITA, and PIV expressions were lower in macrophages infected with MEL+ than in macrophages infected with MEL- conidia, while CD80 expression was similar. No statistical difference in gene expression was observed between macrophages infected by MEL+ and MEL- yeasts. Infection by MGs alone had no clear effect on expression of antigen presentation-associated molecules. Mice infected with MEL+ S. globosa had significantly higher fungal burdens in the lung, liver, spleen, kidney, and testicle compared with mice infected with MEL- S. globosa 21 days post-infection. MHC class II expression changes in the animal study were similar to those observed in the in vitro experiment. Our results indicate that S. globosa melanin can inhibit expression of antigen presentation-associated molecules during both the early and late stages of infection, representing a new mechanism to evade host immunity and to enhance dissemination. Further investigations of melanin's impact on adaptive immunity will be helpful in understanding this fungal virulence factor.


Assuntos
Macrófagos Peritoneais/imunologia , Melaninas/imunologia , Sporothrix/imunologia , Esporotricose/microbiologia , Animais , Apresentação de Antígeno , Antígenos de Histocompatibilidade Classe II/genética , Antígenos de Histocompatibilidade Classe II/imunologia , Interações Hospedeiro-Patógeno , Humanos , Fígado/microbiologia , Pulmão/microbiologia , Macrófagos Peritoneais/microbiologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Sporothrix/genética , Esporotricose/genética , Esporotricose/imunologia
3.
Braz J Microbiol ; 52(1): 81-90, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32557246

RESUMO

The dimorphic fungus Sporothrix globosa is the predominant etiologic agent causing sporotrichosis in China, particularly in the northeast. It has been demonstrated that the incubation temperature and growth phase can influence in vitro antifungal susceptibility profiles of S. schenckii sensu stricto and S. brasiliensis (sibling species of S. globosa). Few studies have reported on the antifungal susceptibility of S. globosa, especially using large numbers of isolates. In this study, we assessed the susceptibility of 80 isolates of S. globosa originating from Jilin Province, northeastern China, to six antifungal agents (itraconazole, terbinafine, voriconazole, posaconazole, fluconazole, and amphotericin B), at varying incubation temperatures and in different fungal growth phases. The isolates were most sensitive to terbinafine (geometric mean [GM] of the minimum inhibitory concentration [MIC]: 0.0356 µg/ml for the mycelial phase at 30 °C, 0.0332 µg/ml for the mycelial phase at 35 °C, and 0.031 µg/ml for the yeast phase, respectively), followed by posaconazole (GM of the MIC: 4.2501 µg/ml for the mycelial phase at 30 °C, 1.4142 µg/ml for the mycelial phase at 35 °C, and 0.7195 µg/ml for the yeast phase, respectively) and itraconazole (GM of the MIC: 6.8448 µg/ml for the mycelial phase at 30 °C, 3.1383 µg/ml for the mycelial phase at 35 °C, and 1.0263 µg/ml for the yeast phase, respectively). The isolates were relatively resistant to fluconazole (GM of the MIC: 76.7716 µg/ml for the mycelial phase at 30 °C, 66.2570 µg/ml for the mycelial phase at 35 °C, and 24.4625 µg/ml for the yeast phase, respectively) and voriconazole (GM of the MIC: 26.2183 µg/ml for the mycelial phase at 30 °C, 13.6895 µg/ml for the mycelial phase at 35 °C, and 1.3899 µg/ml for the yeast phase, respectively). For all the tested azole drugs, the MICs at 30 °C were significantly higher than those at 35 °C (P < 0.001); for all agents except terbinafine, the MICs of S. globosa in the yeast phase were significantly lower than those of the strains in the mycelial phase (P < 0.001). These results show that the sensitivities of S. globosa to antifungal compounds are dependent on incubation temperature and growth phase. To the best of our knowledge, this is the largest study of antifungal susceptibility of S. globosa isolates reported to date. To establish epidemiological cutoff values for S. globosa, further antifungal susceptibility testing studies by independent laboratories located in different regions and using uniform conditions are required.


Assuntos
Antifúngicos/farmacologia , Saccharomyces cerevisiae/efeitos dos fármacos , Sporothrix/efeitos dos fármacos , Anfotericina B/farmacologia , China , Fluconazol/farmacologia , Humanos , Itraconazol/farmacologia , Testes de Sensibilidade Microbiana , Micélio/efeitos dos fármacos , Micélio/crescimento & desenvolvimento , Filogenia , Saccharomyces cerevisiae/crescimento & desenvolvimento , Sporothrix/crescimento & desenvolvimento , Sporothrix/fisiologia , Esporotricose/microbiologia , Terbinafina/farmacologia , Triazóis/farmacologia
4.
Braz J Med Biol Res ; 52(4): e7728, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30994730

RESUMO

Pituitary adenoma is one of the most common tumors in the neuroendocrine system. This study investigated the effects of long non-coding RNAs (lncRNAs) highly up-regulated in liver cancer (HULC) on rat secreting pituitary adenoma GH3 cell viability, migration, invasion, apoptosis, and hormone secretion, as well as the underlying potential mechanisms. Cell transfection and qRT-PCR were used to change and measure the expression levels of HULC, miR-130b, and FOXM1. Cell viability, migration, invasion, and apoptosis were assessed using trypan blue staining assay, MTT assay, two-chamber transwell assay, Guava Nexin assay, and western blotting. The concentrations of prolactin (PRL) and growth hormone (GH) in culture supernatant of GH3 cells were assessed using ELISA. The targeting relationship between miR-130b and FOXM1 was verified using dual luciferase activity. Finally, the expression levels of key factors involved in PI3K/AKT/mTOR and JAK1/STAT3 pathways were evaluated using western blotting. We found that HULC was highly expressed in GH3 cells. Overexpression of HULC promoted GH3 cell viability, migration, invasion, PRL and GH secretion, as well as activated PI3K/AKT/mTOR and JAK1/STAT3 pathways. Knockdown of HULC had opposite effects and induced cell apoptosis. HULC negatively regulated the expression of miR-130b, and miR-130b participated in the effects of HULC on GH3 cells. FOXM1 was a target gene of miR-130b, which was involved in the regulation of GH3 cell viability, migration, invasion, and apoptosis, as well as PI3K/AKT/mTOR and JAK1/STAT3 pathways. In conclusion, HULC tumor-promoting roles in secreting pituitary adenoma might be via down-regulating miR-130b, up-regulating FOXM1, and activating PI3K/AKT/mTOR and JAK1/STAT3 pathways.


Assuntos
Adenoma/patologia , Neoplasias Hipofisárias/patologia , RNA Longo não Codificante/fisiologia , Adenoma/genética , Adenoma/metabolismo , Animais , Apoptose/fisiologia , Western Blotting , Linhagem Celular Tumoral , Ensaios de Migração Celular , Movimento Celular/fisiologia , Sobrevivência Celular/fisiologia , Ensaio de Imunoadsorção Enzimática , Proteína Forkhead Box M1/análise , Proteína Forkhead Box M1/metabolismo , Humanos , Janus Quinase 1/análise , Janus Quinase 1/metabolismo , Luciferases , MicroRNAs/análise , MicroRNAs/metabolismo , Fosfatidilinositol 3-Quinases/análise , Fosfatidilinositol 3-Quinases/metabolismo , Neoplasias Hipofisárias/genética , Neoplasias Hipofisárias/metabolismo , Proteínas Proto-Oncogênicas c-akt/análise , Proteínas Proto-Oncogênicas c-akt/metabolismo , RNA Longo não Codificante/análise , Ratos , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Fator de Transcrição STAT3/análise , Fator de Transcrição STAT3/metabolismo , Serina-Treonina Quinases TOR/análise , Serina-Treonina Quinases TOR/metabolismo , Transfecção
5.
Rev. bras. pesqui. méd. biol ; Braz. j. med. biol. res;52(4): e7728, 2019. graf
Artigo em Inglês | LILACS | ID: biblio-1001506

RESUMO

Pituitary adenoma is one of the most common tumors in the neuroendocrine system. This study investigated the effects of long non-coding RNAs (lncRNAs) highly up-regulated in liver cancer (HULC) on rat secreting pituitary adenoma GH3 cell viability, migration, invasion, apoptosis, and hormone secretion, as well as the underlying potential mechanisms. Cell transfection and qRT-PCR were used to change and measure the expression levels of HULC, miR-130b, and FOXM1. Cell viability, migration, invasion, and apoptosis were assessed using trypan blue staining assay, MTT assay, two-chamber transwell assay, Guava Nexin assay, and western blotting. The concentrations of prolactin (PRL) and growth hormone (GH) in culture supernatant of GH3 cells were assessed using ELISA. The targeting relationship between miR-130b and FOXM1 was verified using dual luciferase activity. Finally, the expression levels of key factors involved in PI3K/AKT/mTOR and JAK1/STAT3 pathways were evaluated using western blotting. We found that HULC was highly expressed in GH3 cells. Overexpression of HULC promoted GH3 cell viability, migration, invasion, PRL and GH secretion, as well as activated PI3K/AKT/mTOR and JAK1/STAT3 pathways. Knockdown of HULC had opposite effects and induced cell apoptosis. HULC negatively regulated the expression of miR-130b, and miR-130b participated in the effects of HULC on GH3 cells. FOXM1 was a target gene of miR-130b, which was involved in the regulation of GH3 cell viability, migration, invasion, and apoptosis, as well as PI3K/AKT/mTOR and JAK1/STAT3 pathways. In conclusion, HULC tumor-promoting roles in secreting pituitary adenoma might be via down-regulating miR-130b, up-regulating FOXM1, and activating PI3K/AKT/mTOR and JAK1/STAT3 pathways.


Assuntos
Humanos , Animais , Ratos , Neoplasias Hipofisárias/patologia , Adenoma/patologia , RNA Longo não Codificante/fisiologia , Ensaio de Imunoadsorção Enzimática , Transfecção , Adenoma/genética , Adenoma/metabolismo , Movimento Celular/fisiologia , Sobrevivência Celular/fisiologia , Western Blotting , Apoptose/fisiologia , MicroRNAs/análise , Linhagem Celular Tumoral , Fator de Transcrição STAT3/análise , Janus Quinase 1/análise , Janus Quinase 1/metabolismo , Ensaios de Migração Celular , Proteína Forkhead Box M1/análise , Proteína Forkhead Box M1/metabolismo , Luciferases
6.
Artigo em Inglês | MEDLINE | ID: mdl-27042172

RESUMO

BACKGROUND: Rabies is very common in People's Republic of China. Each year thousands of people die because of this disease, but rabies diagnosed in pregnancy is very rare. CASE PRESENTATION: In this study, we report the case of a pregnant woman who was infected with the rabies virus after a dog bite. The symptoms of rabies appeared in labor and she died after pregnancy. Her baby and husband did not develop the disease. CONCLUSION: The phenomenon that the newborn infant was healthy may be related to the protective role of placenta in resisting the invasion of the rabies virus or the absence of systemic viremia. The prompt administration of vaccines and anti-rabies immunoglobulin to the infant may have also contributed to his survival.

7.
J. venom. anim. toxins incl. trop. dis ; J. venom. anim. toxins incl. trop. dis;22: 14, 2016. tab
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-954799

RESUMO

Background Rabies is very common in People's Republic of China. Each year thousands of people die because of this disease, but rabies diagnosed in pregnancy is very rare. Case Presentation In this study, we report the case of a pregnant woman who was infected with the rabies virus after a dog bite. The symptoms of rabies appeared in labor and she died after pregnancy. Her baby and husband did not develop the disease. Conclusion The phenomenon that the newborn infant was healthy may be related to the protective role of placenta in resisting the invasion of the rabies virus or the absence of systemic viremia. The prompt administration of vaccines and anti-rabies immunoglobulin to the infant may have also contributed to his survival.(AU)


Assuntos
Humanos , Feminino , Gravidez , Recém-Nascido , Raiva , Vírus da Raiva , Mordeduras e Picadas , Imunoglobulinas , Gestantes , Relatório de Pesquisa
8.
J. venom. anim. toxins incl. trop. dis ; J. venom. anim. toxins incl. trop. dis;22: [1-3], 2016. tab
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1484664

RESUMO

Rabies is very common in Peoples Republic of China. Each year thousands of people die because of this disease, but rabies diagnosed in pregnancy is very rare. Case Presentation In this study, we report the case of a pregnant woman who was infected with the rabies virus after a dog bite. The symptoms of rabies appeared in labor and she died after pregnancy. Her baby and husband did not develop the disease. Conclusion The phenomenon that the newborn infant was healthy may be related to the protective role of placenta in resisting the invasion of the rabies virus or the absence of systemic viremia. The prompt administration of vaccines and anti-rabies immunoglobulin to the infant may have also contributed to his survival.


Assuntos
Feminino , Humanos , Gravidez , Recém-Nascido , Análise de Sobrevida , Vacinas/administração & dosagem , Vacinas/análise , Vírus da Raiva/classificação , Vírus da Raiva/imunologia
9.
J. Venom. Anim. Toxins incl. Trop. Dis. ; 22: [1-3], Maio 20, 2016. tab
Artigo em Inglês | VETINDEX | ID: vti-16086

RESUMO

Rabies is very common in Peoples Republic of China. Each year thousands of people die because of this disease, but rabies diagnosed in pregnancy is very rare. Case Presentation In this study, we report the case of a pregnant woman who was infected with the rabies virus after a dog bite. The symptoms of rabies appeared in labor and she died after pregnancy. Her baby and husband did not develop the disease. Conclusion The phenomenon that the newborn infant was healthy may be related to the protective role of placenta in resisting the invasion of the rabies virus or the absence of systemic viremia. The prompt administration of vaccines and anti-rabies immunoglobulin to the infant may have also contributed to his survival.(AU)


Assuntos
Humanos , Feminino , Gravidez , Recém-Nascido , Análise de Sobrevida , Vacinas/administração & dosagem , Vacinas/análise , Vírus da Raiva/classificação , Vírus da Raiva/imunologia
10.
Artigo em Inglês | MEDLINE | ID: mdl-26336373

RESUMO

BACKGROUND: Rabies is very common in People's Republic of China. Henan province, in the central portion of China, is one of the most densely populated provinces in the entire country. With the new rabies epidemic trend noted in northern and western China, it is necessary to investigate the characteristics of human rabies in this area and control the disease. METHODS: We chose patients in hospital isolation in 18 municipalities in Henan province as the investigation subjects. Data were collected through systematic reporting from these hospitals, whereas a questionnaire was applied to the relatives of patients. RESULTS: A total of 1022 rabies cases were reported. The incidence of human rabies in Henan has increased rapidly since 2005, having peaked in 2007, and maintained a high level in the remaining years. The cases were found mainly in rural areas in the south and east of the province. Rabies was often noted in summer and with the highest number in August. Most cases were noted in males and often in farmers. The patients aged between 40 and 60 years accounted for 36.8 % of all the cases. The wound treatment rate (12.2 %) and vaccination rate (2.6 %) of rabies cases after exposure were relatively low, while the rabies immunoglobulin utilization rate was only 2.8 %. CONCLUSIONS: Rabies epidemic cases at the county level overall were increasing in Henan province during the period of 2005-2013; the epidemic has spread quickly. The data in this study imply that the disease could be better managed by more integrated surveillance across human health and veterinary sectors, improved education and better government policies.

11.
J. Venom. Anim. Toxins incl. Trop. Dis. ; 21: 1-6, Sept. 29, 2015. mapas, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-28021

RESUMO

Background Rabies is very common in Peoples Republic of China. Henan province, in the central portion of China, is one of the most densely populated provinces in the entire country. With the new rabies epidemic trend noted in northern and western China, it is necessary to investigate the characteristics of human rabies in this area and control the disease.Methods We chose patients in hospital isolation in 18 municipalities in Henan province as the investigation subjects. Data were collected through systematic reporting from these hospitals, whereas a questionnaire was applied to the relatives of patients.Results A total of 1022 rabies cases were reported. The incidence of human rabies in Henan has increased rapidly since 2005, having peaked in 2007, and maintained a high level in the remaining years. The cases were found mainly in rural areas in the south and east of the province. Rabies was often noted in summer and with the highest number in August. Most cases were noted in males and often in farmers. The patients aged between 40 and 60 years accounted for 36.8 % of all the cases. The wound treatment rate (12.2 %) and vaccination rate (2.6 %) of rabies cases after exposure were relatively low, while the rabies immunoglobulin utilization rate was only 2.8 %.Conclusions Rabies epidemic cases at the county level overall were increasing in Henan province during the period of 20052013; the epidemic has spread quickly. The data in this study imply that the disease could be better managed by more integrated surveillance across human health and veterinary sectors, improved education and better government policies.(AU)


Assuntos
Humanos , Raiva/epidemiologia , Raiva/prevenção & controle , Zoonoses , China/epidemiologia
12.
J. venom. anim. toxins incl. trop. dis ; J. venom. anim. toxins incl. trop. dis;21: 34, 31/03/2015. tab, graf, mapas
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-954740

RESUMO

Background Rabies is very common in People's Republic of China. Henan province, in the central portion of China, is one of the most densely populated provinces in the entire country. With the new rabies epidemic trend noted in northern and western China, it is necessary to investigate the characteristics of human rabies in this area and control the disease.Methods We chose patients in hospital isolation in 18 municipalities in Henan province as the investigation subjects. Data were collected through systematic reporting from these hospitals, whereas a questionnaire was applied to the relatives of patients.Results A total of 1022 rabies cases were reported. The incidence of human rabies in Henan has increased rapidly since 2005, having peaked in 2007, and maintained a high level in the remaining years. The cases were found mainly in rural areas in the south and east of the province. Rabies was often noted in summer and with the highest number in August. Most cases were noted in males and often in farmers. The patients aged between 40 and 60 years accounted for 36.8 % of all the cases. The wound treatment rate (12.2 %) and vaccination rate (2.6 %) of rabies cases after exposure were relatively low, while the rabies immunoglobulin utilization rate was only 2.8 %.Conclusions Rabies epidemic cases at the county level overall were increasing in Henan province during the period of 2005-2013; the epidemic has spread quickly. The data in this study imply that the disease could be better managed by more integrated surveillance across human health and veterinary sectors, improved education and better government policies.(AU)


Assuntos
Humanos , Raiva , Inquéritos e Questionários , Epidemias , Zoonoses/epidemiologia
13.
J. venom. anim. toxins incl. trop. dis ; J. venom. anim. toxins incl. trop. dis;21: 1-6, 31/03/2015. map, tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1484633

RESUMO

Background Rabies is very common in Peoples Republic of China. Henan province, in the central portion of China, is one of the most densely populated provinces in the entire country. With the new rabies epidemic trend noted in northern and western China, it is necessary to investigate the characteristics of human rabies in this area and control the disease.Methods We chose patients in hospital isolation in 18 municipalities in Henan province as the investigation subjects. Data were collected through systematic reporting from these hospitals, whereas a questionnaire was applied to the relatives of patients.Results A total of 1022 rabies cases were reported. The incidence of human rabies in Henan has increased rapidly since 2005, having peaked in 2007, and maintained a high level in the remaining years. The cases were found mainly in rural areas in the south and east of the province. Rabies was often noted in summer and with the highest number in August. Most cases were noted in males and often in farmers. The patients aged between 40 and 60 years accounted for 36.8 % of all the cases. The wound treatment rate (12.2 %) and vaccination rate (2.6 %) of rabies cases after exposure were relatively low, while the rabies immunoglobulin utilization rate was only 2.8 %.Conclusions Rabies epidemic cases at the county level overall were increasing in Henan province during the period of 20052013; the epidemic has spread quickly. The data in this study imply that the disease could be better managed by more integrated surveillance across human health and veterinary sectors, improved education and better government policies.


Assuntos
Humanos , China/epidemiologia , Raiva/epidemiologia , Raiva/prevenção & controle , Zoonoses
14.
Braz. j. microbiol ; Braz. j. microbiol;40(2): 373-379, Apr.-June 2009. ilus, graf, tab
Artigo em Inglês | LILACS | ID: lil-520226

RESUMO

A lipopeptide biosurfactant produced by Bacillus natto TK-1 has a strong surface activity. The biosurfactant was found to be an anti-adhesive agent against several bacterial strains, and also showed a broad spectrum of antimicrobial activity. The biosurfactant induced a significant reduction in tumor cells viability in a dose- dependent manner.


Um lipopeptídio biosurfactante produzido por Bacillus natto TK-1 apresenta intensa atividade de superfície. Verificou-se que o biosurfactante apresentou atividade antiadesiva contra várias cepas bacterianas, e também atividade antimicrobiana de amplo espectro. O biosurfactante causou uma redução significativa na viabilidade de células tumorais, de forma dose-dependente.


Assuntos
Humanos , Bacillus subtilis , Peptídeos/análise , Células Tumorais Cultivadas , Métodos , Métodos
15.
Braz J Microbiol ; 40(2): 373-9, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24031375

RESUMO

A lipopeptide biosurfactant produced by Bacillus natto TK-1 has a strong surface activity. The biosurfactant was found to be an anti-adhesive agent against several bacterial strains, and also showed a broad spectrum of antimicrobial activity. The biosurfactant induced a significant reduction in tumor cells viability in a dose-dependent manner.

16.
Artigo em Inglês | VETINDEX | ID: vti-444396

RESUMO

A lipopeptide biosurfactant produced by Bacillus natto TK-1 has a strong surface activity. The biosurfactant was found to be an anti-adhesive agent against several bacterial strains, and also showed a broad spectrum of antimicrobial activity. The biosurfactant induced a significant reduction in tumor cells viability in a dose- dependent manner.


Um lipopeptídio biosurfactante produzido por Bacillus natto TK-1 apresenta intensa atividade de superfície. Verificou-se que o biosurfactante apresentou atividade antiadesiva contra várias cepas bacterianas, e também atividade antimicrobiana de amplo espectro. O biosurfactante causou uma redução significativa na viabilidade de células tumorais, de forma dose-dependente.

17.
Artigo em Inglês | LILACS | ID: lil-339347

RESUMO

Abstract. To explore the mechanism of technetium-99m-methylene diphosphonate (MDP) uptake within tumor through analyze a distribution of Tc-99m MDP in mice bearing tumor cell lines. Methods: The uptake of Tc-99m MDP was analyzed in seven human tumor cell lines ( SPC-A1 adenocarcinoma of lung cancer, Bcap-37 Breast cancer, T-24 Bladder cancer, SKOV3 Ovary carcinoma, Hela-229 Cervical carcinoma, SCI-OS Osteosarcoma, SCI-375 Melanoma) and mouse Lewis lung cancer cell line. They were transplanted into athymic mice, SCID nude mice and C57BL/6 mice, respectively. Approximately 10(6) cells of each cell line were injected subcutaneously into a right chest of mouse. After 4&5 weeks, the Tc-99m MDP scintigraphy were determined 6 hours after tail vein injection of 74MBq in 0.05ml every mouse. Result: Biodistribution and tumor uptake MDP was different in the various cell types investigated. According to the RegionRatio program of Siemens Power Macintosh 9500 Computer System, region of interests (RIOs) placed on a small part of the tumor and horizontal copied to left background (T/B) and thoracic spine (T/N) of mice in Tc-99m MDP imaging. The average cpm/pixel ratios were calculated by standardized uptake measure (SUM) and determined the tumor-positive value (T/B) greater than or equal to 1.2. T/B of cell lines were sorted from higher to lower as follows: SCI-OS, Lewis, SKOV3, SCI-375, T-24, SPC-A1, Bcap-37, Hela-229. T/N: SCI-OS, SKOV3, T-24, SCI-375, Lewis, SPC-A1, Bcap-37, Hela-229. The biodistribution data of 99Tcm-MDP in SPC-A1 tumor-bearing BALB/c nude mice were given as ID/g and represent the meansñSD (n=13) in 30 hours after injection of Tc-99m MDP. ID/g of major tissue were sorted from higher to lower as follows: thoracic spine, lumbar, ribs, kidneys, the center of tumor, the ulcer of tumor, the surrounding of tumor, lymph node, blood, lungs, heart, liver. Conclusions: Most of tumor can uptake Tc-99m MDP including human adenocarcinoma. The uptake rate in the center tissue of tumor is higher than other part of tumor. The uptake rate of tumor is higher than non-skeletal tissue unless kidneys. It maybe connected with necrosis or calcification of tumor. Calcium and phosphorus ions were seen frequently in larger tumor. Not only it was caused by fibrous scar and/or surrounding tissues of granuloma but also intra-tumor coagulation and liquefaction necrosis


Assuntos
Animais , Camundongos , Radiometria , Tecnécio , Neoplasias , Animais de Laboratório
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