Browsing by Author "Matos, Manuela"
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- Furry hosts and fungal guests: Investigating dermatophyte carriage in shelter and clinic cats and dogs of northern PortugalPublication . Afonso, Paulo; Quintas, Helder; Vieira, Ana Filipa; Pinto, Eduardo; Matos, Manuela; Soares, Ana; Cardoso, Luís Miguel; Coelho, Ana CláudiaDermatophytosis is a widespread fungal infection affecting both animals and humans, commonly known as ringworm. Dermatophytosis results in the breakdown of keratin, leading to skin, hair, and claw lesions, and has an important global prevalence that is often underestimated. While typically self-limiting, dermatophytosis can pose a severe risk due to its contagious nature, particularly in shelters. This study aimed to assess the prevalence of dermatophytes in the fur of dogs and cats in animal shelters and pet clinics, shedding light on the importance of understanding and managing this infectious disease in both animal and human populations. To better understand the epidemiology of dermatophytes in Portugal, a study was conducted from March to May 2022. The prevalence of dermatophyte isolation in culture was evaluated. A total of 341 animals, 286 (83.9%) dogs and 55 (16.1%) cats were studied, and 45.0% (n=157) of the animals were from shelters, while 54.0% (n=184) were from clinics. Twenty-eight (8.2%) animals had skin lesions, and of these, four (14.3%) tested positive for dermatophytes. Dermatophytes were isolated from 12/341 studied animals. The prevalence of Microsporum canis was 3.2% (confidence interval [CI] 95%: 1.6-5.7%), and the prevalence of Microsporum audouinii was 0.3% (CI 95%: 0.0-1.6%). Healthy dogs and cats without clinical signs were found to carry dermatophytes, stressing the potential for these animals to act as subclinical carriers and emphasizing the importance of pet-owner awareness regarding zoonotic risks and the need for ongoing research and surveillance to mitigate the risks associated with fungal infections.
- The role of natural compounds in rat mammary cancer: the beneficial effects of Santolina chamaecyparissus L. aqueous extractPublication . Azevedo, Tiago; Silva, Jessica; Peixoto, Francisco P.; Silvestre-Ferreira, Ana C.; Gama, Adelina; Seixas, Fernanda; Finimundy, Tiane C.; Barros, Lillian; Matos, Manuela; Oliveira, Paula A.; Faustino-Rocha, Ana; Valada, Abigaël; Anjos, Lara; Moura, Tânia; Ferreira, Rafaela; Santos, Marlene; Pires, Maria João; Neuparth, Maria JoãoBreast cancer is the most diagnosed cancer among women, and a leading cause of death worldwide. Santolina chamaecyparissus L. is a plant with multiple health benefits, including anticancer and anti-diabetic properties. This study aimed to assess the chemopreventive effects of S. chamaecyparissus aqueous extract (SCE) in an animal model of mammary cancer. A total of 28 four-week-old female Wistar rats were divided into four groups: control, MNU-induced (IND), SCE-supplemented (SCE), and SCE+IND. SCE was added to drinking water (12.72 mg/kg body weight) ad libitum. MNU was administered via the intraperitoneal route at 50 days of age. Weekly monitoring of body weight, food/drink intake, humane endpoints, and number of mammary tumours were recorded. Twenty weeks after MNU administration, animals were sacrificed by anaesthetic overdose and a necropsy was performed. Blood samples were used to determine blood count and serum biochemistry analysis, while kidney and liver samples were analysed for oxidative stress. Tumour samples were collected for gene expression and histology studies. SCE chemical composition was analysed by LC-MS and contained 19 phenolic compounds, with the most abundant being myricetin-O-glucuronide and 1,3-O-dicaffeoylquinic acid. Two animals in the IND group were sacrificed due to exceeding the humane endpoint limits. SCE supplementation delayed mammary tumour development, reducing its volume and weight. SCE had a positive impact on haematological parameters, particularly the neutrophil-lymphocyte ratio (P=0.026). No significant differences were observed in serum biochemistry, except for creatinine kinase MB, or in oxidative stress markers. Gene expression analysis showed significantly reduced VEGF expression levels (P=0.0158) in tumours from SCE+IND. These findings suggest that SCE is deserving of further study to identify the individual compounds and to understand its influence on animal models during cancer development.