Histological and Histochemical Description of the Pancreas in the Adult Lesser Capybara (Hydrochoerus isthmius) / Descripción histológica e histoquímica del páncreas en cacós (Hydrochoerus isthmius) adultos

Abstract The aim of this study was to describe histologically and histochemically the pancreas of three adult Hydrochoerus isthmius, attacked by feral dog in Buenavista, Córdoba, Colombia. A complete necropsy was performed and pancreatic fragments were collected and stored in 10% buffered formalin and Bouin liquid. Then, they were dehydrated, diaphanized and embedded in paraffin, stained with Hematoxylin & Eosin, P.A.S., Gomori trichrome, Grimelius and Masson Fontana modified. The H. isthmius pancreas presented a duodenal mesenteric pattern. The exocrine portion was described as a composite tubuloacinar gland. The endocrine portion of the pancreas was constituted by pancreatic islets of Langerhans and a diffuse neuroendocrine system. The histological and histochemical techniques used allowed us to identify the exocrine and endocrine portion of the organ. It is suggested to complement this study with some special techniques for the identification of specific endocrine cells, such as Beta, Alpha, Delta, Epsilon, PP or Gamma.

Resumen El objetivo del presente estudio fue describir histológica e histoquímicamente el páncreas de tres individuos adultos de Hydrochoerus isthmius atacados por perros ferales en Buenavista, Córdoba, Colombia. Se realizó una necropsia completa y se recolectaron fragmentos pancreáticos, los cuales se almacenaron en formol tamponado al 10 % y líquido Bouin. Luego, fueron deshidratados, diafanizados y embebidos en parafina; teñidos con hematoxilina y eosina, P.A.S., tricrómico Gomori, Grimelius y Masson Fontana modificado. El páncreas de H. isthmius presentó un patrón mesentérico duodenal. La porción exocrina fue descrita como una glándula tubuloacinar compuesta. La porción endocrina del páncreas estaba constituida por islotes pancreáticos o Langerhans, y un sistema neuroendocrino difuso. En ese contexto, las técnicas histológicas e histoquímicas utilizadas permitieron identificar la porción exocrina y endocrina del órgano. Se sugiere complementar este estudio con algunas técnicas especiales para la identificación de células endocrinas específicas, como Beta, Alpha, Delta, Epsilon, PP o Gamma.

In vivo phase II-enzymes inducers, as potential chemopreventive agents, based on the chalcone and furoxan skeletons.

Cancer chemoprevention involves prevention/delay/reverse of the carcinogenic process through administration of cancer chemopreventive agents (CCA). Compounds which are able to induce detoxification-enzymes, especially monofunctional phase II enzymes, have become in excellent approaches for new CCA. Herein, we report the synthesis of new furoxanyl chalcone-like hybrid compounds as CCA. In vitro studies showed that phenylfuroxanyl derivatives 6 and 9 displayed the best activities being 9 the greatest monofunctional-inducer. Additionally, compounds were non-mutagenic against TA98 Salmonella typhimurium strain (Ames test) and could be used in the prevention of the progression of pre-malignant lesions for their cytotoxic activity against tumoral cells. In vivo proof of concept showed increment on phase II-enzymes activities in liver, colon and mammary gland having derivative 9 the best induction profiles. We probed Nrf2 nuclear translocation is operative for both compounds allowing to exert protective effects via expression of downstream phase-II enzymes.

Caracterización hematológica de hicoteas (Trachemys callirostris Gray, 1856) en Córdoba, Colombia / Hematological Characterization of Hicotea Turtles (Trachemys callirostris Gray, 1856) in Córdoba (Colombia) / Caracterização hematológica de hicoteas (Trachemys callirostris Gray, 1856) em Córdoba, na Colômbia

Se recolectaron 69 muestras de Trachemys callirostris en condiciones ex situ e in situ, para determinar sus parámetros hematológicos, comparar estos valores (considerando sexo, edad y condición) y establecer la morfología de sus células. A los animales se les extrajo sangre de la vena yugular. Se determinaron hematocrito, concentración de hemoglobina, recuentos total de eritrocitos, leucocitos y trombocitos e índices eritrocitarios (volumen corpuscular medio, hemoglobina corpuscular media y concentración de hemoglobina corpuscular media). En extendidos sanguíneos se realizaron el conteo diferencial de leucocitos y la descripción de la morfología de las células encontradas. Los valores promedio encontrados para todos los individuos fueron: hematocrito (29,9% ± 5,1), hemoglobina (4,0 ± 1,0 g/dl), VCM (327 ± 15,3 fl), HCM (45 ± 17,5 pg), CMHC (14 ± 6%), conteo total de trombocitos (15,0 ± 5,4 X 10³ µL), conteo total de eritrocitos (0,92 x 10(6)/µL ± 0,12), conteo total de leucocitos (12,10 ± 5,0 x 10³ µL). Al aplicar el análisis de varianza se encontró que no existe diferencia estadísticamente significativa (p < 0,05) entre Trachemys callirostris de distintos pesos (500 a 2000 g). Sin embargo, existen diferencias significativas (p < 0,05) y altamente significativas (p < 0,01) de la mayoría de las variables hematológicas entre sexos y entre hicoteas mantenidas en condición in situ y ex situ. De esta forma, las diferencias encontradas entre individuos, dependiendo su peso, sexo y condición de mantenimiento (in situ o ex situ), sirven como referencia para el establecimiento de protocolos de manejo de la especie en cautiverio.

69 samples from Trachemys callirostris were collected in situ and ex situ, to determine their hematological parameters, to compare these values (considering sex, age, and condition), and to establish the morphology of their cells. Blood was collected from the jugular vein of the animals. Hematocrit, hemoglobin concentration, total counts of erythrocytes, leukocytes and thrombocytes, and red cell indices were determined (mean corpuscular volume, mean corpuscular hemoglobin, and mean corpuscular hemoglobin concentration). Differential leukocyte count was performed, and the morphology of cells found in blood smears was described. The average values found for all individuals were: hematocrit (29.9% ± 5.1), hemoglobin (4.0 ± 1.0 g / dl), MCV (327 ± 15.3 fL), MCH (45 ± 17.5 pg), MCHC (14 ± 6%), total count of thrombocytes (15.0 ± 5.4 x 10³ µL), total count of erythrocytes (0.92 x 10(6) µL ± 0.12), and total count of leukocytes (12.10 ± 5.0 x 10³ µL). Analysis of variance showed no statistically significant difference (p < 0.05) between Trachemys callirostris of different weights (500 to 2000 g). Nevertheless, it showed significant (p <0.05) and highly significant differences (p <0.01) for most hematologic variables between sexes and hicotea turtles maintained in situ and ex situ. Thus, differences found between individuals, depending on weight, sex and condition of maintenance (in situ or ex situ), serve as a reference to establish protocols for maintaining turtles in captivity.

Coletaram-se 69 amostras de Trachemys callirostris em condições ex situ e in situ, para determinar seus parâmetros hematológicos, comparar estes valores (considerando sexo, idade e condição) e estabelecer a morfologia de suas células. Aos animais lhes foi extraído sangue da veia jugular. Determinara-se hematócrito, concentração de hemoglobina, recontagens total de eritrócitos, leucócitos e trombócitos e índices eritrocitários (volume corpuscular médio, hemoglobina corpuscular média e concentração de hemoglobina corpuscular média). No sangue estendido foi realizada a contagem diferencial de leucócitos e a descrição da morfologia das células encontradas. Os valores médios encontrados para todos os indivíduos foram: hematócrito (29,9% ± 5,1), hemoglobina (4,0 ± 1,0 g/dl), VCM (327 ± 15,3 fl), HCM (45 ± 17,5 pg), CMHC (14 ± 6%), contagem total de trombócitos (15,0 ± 5,4 x 10³ µL), contagem total de eritrocitos (0,92 x 10(6) µL ± 0,12), contagem total de leucócitos (12,10 ± 5,0 x 10³ µL). Ao aplicar a análise de variância se encontrou que não existe diferença estatisticamente significativa (p < 0,05) entre Trachemys callirostris de diferentes pesos (500 a 2000 g). Porém, existem diferenças significativas (p < 0,05) e altamente significativas (p < 0,01) da maioria das variáveis hematológicas entre sexos e entre hicoteas mantidas em condição in situ e ex situ. Desta forma, as diferenças encontradas entre indivíduos, dependendo seu peso, sexo e condição de manutenção (in situ ou ex situ), servem como referência para o estabelecimento de protocolos de manejo da espécie em cativeiro.

Histopatología de órganos y lesiones en hicoteas Trachemys callirostris callirostris (Gray, 1856) mantenidas en cautiverio en Córdoba, Colombia / Histopathology of organs and lesions in captive Colombian slider turtles (Trachemys callirostris callirostris) from Cordoba, Colombia / Histopatologia de órgãos e lesões em tartarugas icoteas Trachemys callirostris callirostris (Gray, 1856) em Córdoba, Colômbia

Resumen Se hizo una evaluación posmortem de 41 individuos de T. callirostris, mantenidos en cautiverio durante el 2009 en el Centro de Atención de Fauna (CAV-CVS), a través de exámenes histopatológicos de los principales órganos y lesiones encontradas. Para esto se realizó un examen clínico externo de los individuos y se evaluó cada uno de los órganos macroscópicamente. Los órganos que presentaron anomalías fueron colectados para histopatología con la tinción Hematoxilina-Eosina. De los individuos evaluados, el principal hallazgo patológico externo correspondió a la enfermedad septicémica ulcerativa cutánea (SCUD), el cual se presentó en el 90% de los individuos. A la evaluación macroscópica de los órganos internos, se observaron anomalías en la cavidad celómica, hígado, bazo y pulmones. Se presentaron lesiones en el 71% de los hígados, 92% de los bazos, 41% de los riñones y 40% de los pulmones. Lo anterior demuestra el efecto negativo que tiene el cautiverio sobre los individuos silvestres de esta especie que han sido decomisados producto del tráfico ilegal.

A postmortem evaluation of 41 T. callirostris kept in captivity during the year 2009 was conducted at CAV-CVS Wildlife Care Center. The evaluation was performed in animals confiscated as a result of illegal trafficking. Histopathological examination of main organs and lesions was conducted in all animals. External clinical examination was also conducted and organs were macroscopically evaluated. Organs with anomalies were collected for histopathology and stained with hematoxylin-eosin stain. The most common external pathology found was Septicemic Cutaneous Ulcerative Disease (SCUD), present in 90% of the individuals. Abnormalities in the coelomic cavity, liver, spleen and lungs were observed while performing the macroscopic evaluation of internal organs. Lesions were present in 71% of livers, 92% of spleens, 41% of kidneys, and 40% of the lungs. This study shows the negative effects of captivity on wild individuals of this species.

Avaliou-se o estado sanitário post-mortem de 41 indivíduos de T.callirostris, mantidos em cativeiro durante o 2009 no centro de atenção de fauna Silvestre (CAV-CVS). A avaliação se fez a traves de analise histopatológica dos principais órgãos e lesões encontradas. Para isto, realizou-se uma avaliação clinica externa dos indivíduos e avaliaram-se cada um dos órgãos macroscopicamente. Os órgãos que apresentaram anomalias foram coletados para histopatologia com Hematoxilina-Eosina. Dos indivíduos avaliados, a principal descoberta no exame patológico externo correspondeu a doença septicêmica ulcerativa cutânea (SCUD), o qual apresentou-se no 90% dos indivíduos (37/41). Na avaliação macroscópica dos órgãos internos, observaram-se anomalias na cavidade celômica, fígado, baço e pulmões. Apresentaram-se lesões no 71% dos fígados, 92% dos baços, 41% dos rins e 40% dos pulmões. O anterior demonstra o efeito negativo que tem o cativeiro sob os indivíduos silvestres desta espécie que tem sido decomisados como produto do trafego ilegal.

Aplidin, a marine organism-derived compound with potent antimyeloma activity in vitro and in vivo.

Despite recent progress in its treatment, multiple myeloma (MM) remains incurable, thus necessitating identification of novel anti-MM agents. We report that the marine-derived cyclodepsipeptide Aplidin exhibits, at clinically achievable concentrations, potent in vitro activity against primary MM tumor cells and a broad spectrum of human MM cell lines, including cells resistant to conventional (e.g., dexamethasone, alkylating agents, and anthracyclines) or novel (e.g., thalidomide and bortezomib) anti-MM agents. Aplidin is active against MM cells in the presence of proliferative/antiapoptotic cytokines or bone marrow stromal cells and has additive or synergistic effects with some of the established anti-MM agents. Mechanistically, a short in vitro exposure to Aplidin induces MM cell death, which involves activation of p38 and c-jun NH(2)-terminal kinase signaling, Fas/CD95 translocation to lipid rafts, and caspase activation. The anti-MM effect of Aplidin is associated with suppression of a constellation of proliferative/antiapoptotic genes (e.g., MYC, MYBL2, BUB1, MCM2, MCM4, MCM5, and survivin) and up-regulation of several potential regulators of apoptosis (including c-JUN, TRAIL, CASP9, and Smac). Aplidin exhibited in vivo anti-MM activity in a mouse xenograft model. The profile of the anti-MM activity of Aplidin in our preclinical models provided the framework for its clinical testing in MM, which has already provided favorable preliminary results.

DNA and non-DNA targets in the mechanism of action of the antitumor drug trabectedin.

We have analyzed the DNA binding properties of the antitumor agent trabectedin (ET-743, Yondelis) and different analogs, namely, ET-745, lacking the C21-hydroxyl group, and ET-637, ET-594, ET-637-OBu, with modifications at the trabectedin C domain, versus their effects on cell cycle, apoptosis, and gene expression. ET-745 failed to bind DNA, highlighting the importance of the C21-hydroxyl group for DNA binding. Analogs ranked trabectedin >> ET-637 approximately ET-594 > ET-637-OBu >> ET-745 for their DNA binding capacity; ET-637 and ET-594 display very different biological activities. Drugs were clustered in three major groups showing high (trabectedin, ET-637), intermediate (ET-637-OBu), and low (ET-594, ET-745) cytotoxic activity and similar transcriptional profiling responses. C21-hydroxyl-deficient analogs of the above-mentioned compounds showed a dramatic decrease in biological activity. Our data suggest that trabectedin interacts with an additional non-DNA target to raise an effective antitumor response, and that this interaction is favored through trabectedin-DNA complexes.

Lamellarin D: a novel pro-apoptotic agent from marine origin insensitive to P-glycoprotein-mediated drug efflux.

Lamellarin D (LAM-D) is a marine alkaloid endowed with potent cytotoxic activities against various tumor cells, in particular human prostate cancer cells and leukemia cells. Its cytotoxic action is dependent, at least in part, to its capacity to inhibit topoisomerase I. P388CPT5 murine leukemia cells resistant to the reference topoisomerase I poison camptothecin (CPT) are cross-resistant to LAM-D but the relative resistance index (RRI) is significantly reduced with LAM-D (RRI=21) compared to CPT (RRI=103). To comprehend further the mechanism of action of this novel marine antitumor agent, we have investigated the influence of the P glycoprotein (Pgp) on the cytotoxicity of LAM-D and the proapoptotic effects induced by the alkaloid. P388CPT5 cells, expressing a mutated top1 gene, display a functional Pgp, as judged from cytometry experiments performed with cells treated with rhodamine 123 or calcein-ester whereas no Pgp activity was detected with the parental P388 cells. P388CPT5 cells are also cross-resistant to the topoisomerase II poisons doxorubicin and etoposide but the resistance is abolished in the presence of verapamil or quinine (at non toxic concentrations) which reverse the multidrug resistance (MDR) phenotype. In contrast, the RRI measured with LAM-D and CPT remain unchanged in the presence of the two MDR reversal agents. The effects of LAM-D on the cell cycle progression were different in the parental P388 cells compared with the CPT-resistant which were blocked in the S and subsequently G2-M phases of the cell cycle. Cytometry experiments with the JC-1 fluorescent marker revealed that LAM-D and CPT promoted apoptosis in parental P388 cells via an activation of the mitochondrial pathway. In contrast, a massive depolarisation of the mitochondrial membrane potential and a nuclear fragmentation were detected only with LAM-D on P388CPT5 cells. This in vitro work identifies LAM-D as a potent pro-apoptotic agent and its cytotoxic action is fully maintained in multidrug-resistant cells compared to the sensitive parental cell line.