Dissecção endoscópica submucosa com incisão circunferencial versus túnel submucoso no tratamento da neoplasia superficial do esôfago / Endoscopic submucosal dissection with circumferential incision versus tunneling method for treatment of superficial esophageal cancer

ABSTRACT BACKGROUND: Endoscopic submucosal dissection (ESD) of esophageal superficial neoplasm is associated with a high en bloc R0 resection rate and low recurrence. OBJECTIVE: We aim to compare the performance and clinical outcomes of ESD via ESD after circumferential incision (ESD-C) versus submucosal tunneling (ESD-T). METHODS: Single-center retrospective analysis of all consecutive patients who underwent ESD for superficial esophageal cancer, between 2009 and 2018. ESD-T was defined as the technique of making the mucosal incisions followed by submucosal tunneling in the oral to anal direction. ESD-C consisted of completing a circumferential incision followed by ESD. Main study outcomes included en bloc and R0 resection rates. Secondary outcomes included procedural characteristics, curative resection rate, local recurrence and adverse events. RESULTS: A total of 65 procedures (23 ESD-T and 42 ESD-C) were performed for ESCC (40; 61.5%) and BE-neoplasia (25; 38.5%). There were no statistically significant differences between patients who underwent ESD-T versus ESD-C in en bloc (91.3% vs 100%, P=0.12), R0 (65.2% vs 78.6%, P=0.24), curative resection rates (65.2% vs 73.8%, P=0.47) and mean procedure time (118.7 min with vs 102.4 min, P=0.35). Adverse events for ESD-T and ESD-C were as follows: bleeding (0 versus 2.4%; P=0.53), perforation (4.3% vs 0; P=0.61), esophageal stricture (8.7% versus 9.5%; P=0.31). Local recurrence was encountered in 8.7% after ESD-T and 2.4% after ESD-C (P=0.28) at a mean follow-up of 8 and 2.75 years, respectively (P=0.001). CONCLUSION: ESD-T and ESD-C appear to be equally effective with similar safety profiles for the management of superficial esophageal neoplasms.

RESUMO CONTEXTO: A dissecção endoscópica submucosa (DES) no tratamento da neoplasia superficial do esôfago está associada a uma alta taxa de ressecção R0 em bloco e baixa taxa de recorrência. OBJETIVO: O objetivo deste estudo é comparar o desempenho e os resultados clínicos da DES com incisão circunferencial (DES-C) versus com DES com túnel submucoso (DES-TS). MÉTODOS: Estudo retrospectivo de banco de dados coletados prospectivamente de um centro especializado em DES, investigando pacientes consecutivos submetidos à DES por câncer de esôfago superficial, entre 2009 e 2018. DES-TS foi definida como a técnica de realizar primeiro incisões na mucosa seguida de tunelamento submucoso no sentido oral para anal. DES-C consistiu em completar uma incisão circunferencial seguida da dissecção submucosa. As principais variáveis do estudo incluíram taxas de ressecção em bloco e R0. Os resultados secundários incluíram características do procedimento, taxa de ressecção curativa, recorrência local e eventos adversos. RESULTADOS: Um total de 65 procedimentos (23 DES-TS e 42 DES-C) foram realizados para CCE de esôfago (40; 61,5%) e neoplasia associada ao EB (25; 38,5%). Não houve diferenças estatisticamente significativas entre os pacientes submetidos a DES-TS versus DES-C nas taxas de ressecção em bloco (91,3% vs 100%, P=0,12), R0 (65,2% vs 78,6%, P=0,24), taxas de ressecção curativa (65,2% vs 73,8%, P=0,47) e tempo médio do procedimento (118,7 min com vs 102,4 min, P=0,35). Os eventos adversos para DES-TS e DES-C foram os seguintes: sangramento (0 vs 2,4%; P=0,53), perfuração (4,3% vs 0; P=0,61), estenose esofágica (8,7% vs 9,5%; P=0,31). A recorrência local foi encontrada em 8,7% após DES-TS e 2,4% após DES-C (P=0,28) em um seguimento médio de 8 e 2,75 anos, respectivamente (P=0,001). CONCLUSÃO: DES-TS e DES-C demostram ser igualmente eficazes com perfil de segurança semelhante para o tratamento das neoplasias superficiais do esôfago.

Composition, density and biomass of fish community from the surf zone as a function of the lunar cycle at Miramar Beach in Cabedelo, Paraíba

The influence of the moon cycles on the ichthyofauna has been little studied in the surf zone. In this study, the number of species, density and biomass were evaluated as a function of the moon. A total of 49 species distributed in 24 families were captured in two areas of Miramar beach. The mean density was significant high in the weaning and low in the new moon, while density and biomass together showed differences for areas. The most abundant species were Anchoa tricolor and Trachinotus falcatus (new moon), and Anchovia clupeoides showed significant differences in the waning moon. The RDA indicates that turbidity influenced significantly the presence of two species group. The group I were represented by Stellifer brasiliensis, Trachinotus goodei, A. clupeoides, Chilomycterus spinosus and Conodon nobilis that occurred on the waning and new phases in both areas, while the group II were represented by Polydactylus virginicus and Haemulopsis corvinaeformis in the full moon. The surf zones may also be strongly governed by the lunar phases. Therefore, the results found in this study, showed that the biological interactions between the species with turbidity and moon might explain the density and biomass variations for some species in the surf zone.(AU)

A influência das fases lunares sobre a ictiofauna tem sido pouco estudada na zona de arrebentação. Nesse estudo, foram avaliadas, o número de espécies, densidade e a biomassa da ictiofauna em função da lua. Foram capturadas 49 espécies distribuídas em 24 famílias em duas áreas na Praia de Miramar. A densidade foi significativamente elevada nas luas minguante e nova. Além disso, a densidade e biomassa juntas mostraram diferenças entre as áreas. As espécies mais abundantes na lua nova foram Anchoa tricolor e Trachinotus falcatus, e Anchovia clupeoides teve uma maior abundancia na lua minguante. O RDA, indicou que a turbidez influenciou significativamente a presença de dois grupos distintos. O grupo I, representado por Stellifer brasiliensis, Trachinotus goodei, A. clupeoides, Chilomycterus spinosus e Conodon nobilis estiveram presentes nas luas minguante e nova em ambas as áreas, e o grupo II, representado por Polydactylus virginicus e Haemulopsis corvinaeformis na lua cheia. As zonas de arrebentação também podem ser reguladas fortemente pelas fases lunares. Os resultados mostraram que as interações biológicas entre as espécies com a turbidez e as fases lunares podem explicar as variações de densidade e biomassa para algumas espécies na zona de arrebentação.(AU)

Leishmanicidal compounds of Nectria pseudotrichia, an endophytic fungus isolated from the plant Caesalpinia echinata (Brazilwood)

BACKGROUND In a screen of extracts from plants and fungi to detect antileishmanial activity, we found that the ethyl acetate extract of the fungus Nectria pseudotrichia, isolated from the tree Caesalpinia echinata (Brazilwood), is a promising source of bioactive compounds. OBJECTIVES The aims of this study were to isolate and determine the chemical structures of the compounds responsible for the antileishmanial activity of the organic extract from N. pseudotrichia. METHODS Compounds were isolated by chromatographic fractionation using semi-preparative high-performance liquid chromatography, and their chemical structures were determined by analytical and spectral data and by comparison with published data. The antileishmanial activity of the isolated compounds was evaluated in intracellular amastigote forms of Leishmania (Viannia) braziliensis expressing firefly luciferase as reporter gene, and cytotoxicity was determined in Vero and THP-1 mammalian cell lines by MTT assay. FINDINGS Fractionation of the extract yielded seven compounds: 10-acetyl trichoderonic acid A (1), 6′-acetoxy-piliformic acid (2), 5′,6′-dehydropiliformic acid (3), piliformic acid (4), hydroheptelidic acid (5), xylaric acid D (6), and cytochalasin D (7). Compounds 1, 2 and 3 are reported here for the first time. Compounds 1, 2, and 5 were more active, with IC50 values of 21.4, 28.3, and 24.8 µM, respectively, and showed low toxicity to Vero and THP-1 cells. MAIN CONCLUSIONS N. pseudotrichia produces secondary metabolites that are more toxic to intracellular amastigote forms of L. (V.) braziliensis than to mammalian cells.

Synthesis and cytotoxicity evaluation of thiosemicarbazones and their thiazole derivatives

ABSTRACT The aims of this study were to synthesize a series of thiosemicarbazones and their thiazole derivatives, to investigate their cytotoxic activity against three human cancers and normal (Vero cells) cell lines, and to evaluate the pro-apoptotic potential of the most active compounds. Materials and Methods: The thiosemicarbazones were obtained by reacting an aromatic aldehyde with thiosemicarbazide (yield 71-96%), which were subjected to a cyclization with α-bromoacetophenone to yield the required thiazole heterocycles (yield 63-100%). All the synthesized compounds were screened at 50 µM concentration against three cell lines representing HL60 (promyelocytic leukemia), Jurkat (acute lymphoblastic leukemia), and MCF-7 (breast cancer). The pro-apoptotic effect was measured by flow cytometry as the percentage of cells with hypodiploid DNA. Results: Three thiazole compounds showed activity against at least one tumor cell line (IC50 = 43-76 µM) and low cytotoxicity against Vero cells (IC50 > 100 M). The most active compound of this series induced 91% and 51% DNA fragmentation in HL60 and MCF-7 cell lines, respectively, suggesting that this compound triggered apoptosis in these cells. Conclusion: Among the synthesized compounds, one in particular was found to exert antiproliferative and pro-apoptotic activity on tumor cells and can be considered promising as a lead molecule for the design of new analogues with improved activity.

RESUMO O estudo teve como objetivo a síntese de uma série de tiossemicarbazonas e seus derivados tiazólicos e a avaliação da atividade citotóxica contra três linhagens de células tumorais humanas e células normais (Vero), a fim de se avaliar o potencial pró-apoptótico dos compostos mais ativos. As tiossemicarbazonas foram obtidas por reação entre um aldeído aromático e tiossemicarbazida (rend. 71-96%), as quais foram submetidas à ciclização com α-bromoacetofenona, fornecendo os heterociclos tiazólicos desejados (rend. 63-100%). Todos os compostos sintetizados foram testados na concentração de 50 µM contra três linhagens de células tumorais: HL60 (leucemia promielocítica), Jurkat (leucemia linfoblástica aguda) e MCF-7 (câncer de mama). O efeito pró-apoptótico foi avaliado por citometria de fluxo como porcentagem de células com DNA hipodiplóide. Três compostos tiazólicos foram ativos contra, pelo menos, uma linhagem tumoral (CI50=43-76 µM), com baixa citotoxicidade contra células Vero (CI50 > 100 M). O composto mais ativo dessa série induziu fragmentação do DNA de 91% e 51% nas linhagens HL60 e MCF-7, respectivamente, sugerindo que este composto ativou a apoptose nessas células. Dentre os compostos sintetizados, um em particular apresentou atividade antiproliferativa e pró-apoptótica em células tumorais e pode ser considerado composto protótipo promissor na busca por novos análogos com atividade melhorada.