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Publications

2021

Refinement of Animal Model of Colorectal Carcinogenesis through the Definition of Novel Humane Endpoints

Authors
Silva-Reis, R; Faustino-Rocha, AI; Gonçalves, M; Ribeiro, CC; Ferreira, T; Ribeiro-Silva, C; Gonçalves, L; Antunes, L; Venâncio, C; Ferreira, R; Gama, A; Oliveira, PA;

Publication
Animals

Abstract
This study aimed to define appropriate humane endpoints (HEs) for an animal model of colorectal carcinogenesis (CRC). Twenty-nine male Wistar rats were divided into two control groups (CTRL1 and CTRL2) injected with ethylenediamine tetraacetic acid (EDTA)–saline solutions and two induced groups (CRC1 and CRC2) injected with 1,2-dimethylhydrazine (DMH) for seven weeks. A score sheet with 14 biological parameters was used to assess animal welfare. Groups CRC1 and CTRL1 and groups CRC2 and CTRL2 were euthanized 11 and 17 weeks after the first DMH administration, respectively. Five animals from the induced groups died unexpectedly during the protocol (survival rates of 75.0% and 66.7% for groups CRC1 and CRC2, respectively). The final mean body weight (BW) was smaller in the CRC groups when compared with that in the CTRL groups. A uniformity of characteristics preceding the premature animals’ death was observed, namely an increase of 10% in mean BW, swollen abdomen, diarrhea, and priapism. The surface abdominal temperature of group CRC2 was significantly higher, when compared with that of group CTRL2. The parameters already described in other cancer models proved to be insufficient. For the CRC model, we considered assessing the abdominal temperature, priapism, and sudden increase in the BW.

2021

Refinement of animal model of colorectal carcinogenesis through the definition of novel humane endpoints

Authors
Silva Reis, R; Faustino Rocha, AI; Goncalves, M; Ribeiro, CC; Ferreira, T; Ribeiro Silva, C; Goncalves, L; Antunes, L; Venancio, C; Ferreira, R; Gama, A; Oliveira, PA;

Publication
Animals

Abstract
This study aimed to define appropriate humane endpoints (HEs) for an animal model of colorectal carcinogenesis (CRC). Twenty-nine male Wistar rats were divided into two control groups (CTRL1 and CTRL2) injected with ethylenediamine tetraacetic acid (EDTA)–saline solutions and two induced groups (CRC1 and CRC2) injected with 1,2-dimethylhydrazine (DMH) for seven weeks. A score sheet with 14 biological parameters was used to assess animal welfare. Groups CRC1 and CTRL1 and groups CRC2 and CTRL2 were euthanized 11 and 17 weeks after the first DMH administration, respectively. Five animals from the induced groups died unexpectedly during the protocol (survival rates of 75.0% and 66.7% for groups CRC1 and CRC2, respectively). The final mean body weight (BW) was smaller in the CRC groups when compared with that in the CTRL groups. A uniformity of characteristics preceding the premature animals’ death was observed, namely an increase of 10% in mean BW, swollen abdomen, diarrhea, and priapism. The surface abdominal temperature of group CRC2 was significantly higher, when compared with that of group CTRL2. The parameters already described in other cancer models proved to be insufficient. For the CRC model, we considered assessing the abdominal temperature, priapism, and sudden increase in the BW. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

2020

Distraction index measurement on the dog's hip joint using a dedicated software

Authors
Alves Pimenta, S; Santana, A; Martins, J; Colaco, B; Goncalves, L; Ginja, M;

Publication
ARQUIVO BRASILEIRO DE MEDICINA VETERINARIA E ZOOTECNIA

Abstract
The aim of this study was to test the accuracy of a new automated computer software tool for the assessment of passive hip laxity. The hip laxity was estimated using the dedicated computer software by two blinded evaluators, one previously trained and one without specific training for distraction index measurement, in two independent sessions using 230 hip joints from 115 dogs that underwent screening for passive hip laxity using the distraction view. Previously, all of these radiographs were sent to PennHIP Analysis Center for an official distraction index record. The measurement repeatability of the two sessions was adequate for both evaluators. The reproducibility of the official distraction index measurement, mean distraction index +/- standard deviation 0.44 +/- 0.15, was adequate (P>0.05) for the trained evaluator, 0.44 +/- 0.15, and non-adequate (P<0.05), for the non-trained evaluator 0.47 +/- 0.17. The distraction index measurement tool proposed can be used with confidence for hip laxity evaluation by trained evaluators, as it provided good repeatability and reproducibility of official reports. The simplicity of the process described leads to a less time-consuming and more affordable procedure.

2020

Distraction index measurement on the dog's hip joint using a dedicated software

Authors
Alves-Pimenta, S; Santana, A; Martins, J; Colaço, B; Gonçalves, L; Ginja, M;

Publication
Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Abstract
ABSTRACT The aim of this study was to test the accuracy of a new automated computer software tool for the assessment of passive hip laxity. The hip laxity was estimated using the dedicated computer software by two blinded evaluators, one previously trained and one without specific training for distraction index measurement, in two independent sessions using 230 hip joints from 115 dogs that underwent screening for passive hip laxity using the distraction view. Previously, all of these radiographs were sent to PennHIP Analysis Center for an official distraction index record. The measurement repeatability of the two sessions was adequate for both evaluators. The reproducibility of the official distraction index measurement, mean distraction index±standard deviation 0.44±0.15, was adequate (P>0.05) for the trained evaluator, 0.44±0.15, and non-adequate (P<0.05), for the non-trained evaluator 0.47±0.17. The distraction index measurement tool proposed can be used with confidence for hip laxity evaluation by trained evaluators, as it provided good repeatability and reproducibility of official reports. The simplicity of the process described leads to a less time-consuming and more affordable procedure.

2017

Synergistic effect of carboplatin and piroxicam on two bladder cancer cell lines

Authors
Silva, J; Arantes Rodrigues, R; Pinto Leite, R; Faustino Rocha, AI; Fidalgo Goncalves, L; Santos, L; Oliveira, PA;

Publication
Anticancer Research

Abstract
Background/Aim: This study aimed to evaluate the in vitro efficacy of carboplatin and piroxicam, both in isolation and combined, against T24 and 5637 human urinary bladder cancer cell lines. Materials and Methods: Cell viability, drug interaction, cell morphology, cell proliferation, apoptosis and autophagy were analyzed after 72 h of drug exposure. Statistical analysis was performed and values of p<0.05 were considered statistically significant. Results: Drug exposure in combination led to a significant reduction of cell viability comparatively to single-drug exposure. These combinations resulted in a synergistic interaction in the T24 (combination index for 50% effect (CI50)=0.65) and 5637 (CI50=0.17) cell lines. Notable increase of morphological alterations, a marked decrease of Ki-67 expression, a considerable enhancement of autophagic vacuoles and a minimal effect on apoptosis was observed in both cell lines treated with combined drugs. Conclusion: Data showed that in vitro combination of carboplatin and piroxicam produced a more potent antiproliferative effect when compared to single drugs.

Supervised
thesis

2017

Monitorização não invasiva do nível de lactato

Author
Sónia Isabel Martins Pereira

Institution

2016

Desenvolvimento de um sistema wearable para a monitorização da taxa de alcoolemia

Author
Ana Patrícia Queirós Gomes

Institution
UTAD

2016

Monitorização não invasiva do nível de lactato

Author
Sónia Isabel Martins Pereira

Institution
UTAD

2015

Desenvolvimento da aplicação informática interpharm para estudar a interção entre fármacos

Author
Ana Rita Fernandes de Sousa

Institution
UTAD