Person: Pérez Alenza, María De Los Dolores
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First Name
María De Los Dolores
Last Name
Pérez Alenza
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Veterinaria
Department
Medicina y Cirugía Animal
Area
Medicina y Cirugía Animal
Identifiers
8 results
Search Results
Now showing 1 - 8 of 8
Item Histopathological and immunohistochemical findings in lymphoid tissues of the endangered Iberian lynx (Lynx pardinus)(Comparative Immunology, Microbiology and Infectious Diseases, 2006) Peña Fernández, Laura Luisa; García Palencia, María Del Pilar; Jiménez Martínez, María De Los Ángeles; Benito, Alberto; Pérez Alenza, María De Los Dolores; Sánchez Maldonado, María BelénThe Iberian lynx (Lynx pardinus) is the most threatened wild feline in the world. Little is known about the diseases and pathology that affect this animal. The aim of this study was to evaluate the histopathological status of the peripheral lymphoid tissues and thymus of Iberian lynxes necropsied between 1998 and 2003. Seventeen animals including females (n=8) and males (n=9), age range of 10 months to 16 years, with different causes of death were histopathologically and immunohistochemically (anti-CD3, CD79, MAC387, CD68) studied. Feline immunosuppressive virus laboratorial tests were negative. Five individuals presented neoplasia and/or tuberculosis. All animals presented some degree of both B and T cells depletion in peripheral lymphoid tissues and follicular hyalinosis in the center of depleted follicles. A viral origin of the lymphoid depletion is postulated although other causes (inbreeding, stress, toxic) are not ruled out. The loss of the effectiveness of the immune system increases the vulnerability of the critically endangered Iberian lynx to pathogensItem Steroids and receptors in canine mammary cancer(Steroids, 2006) Illera Del Portal, Juan Carlos; Pérez Alenza, María De Los Dolores; Nieto Ruiz De Zárate, Ana Isabel; Jiménez, María; Silván Granado, Gema; Dunner Boxberger, Helene Susana; Peña Fernández, Laura LuisaThe aims of this study were to investigate the serum and tissue content of androgens and estrogens in canine inflammatory mammary carcinomas (IMC) as well as in non-inflammatory malignant mammary tumors (MMT), and assessed the immunoexpression of estrogen and androgen receptors using immunohistochemistry. Profiles for the androgens dehydroepiandrosterone (DHEA), androstenedione (A4), and testosterone (T), and for the estrogens 17β estradiol (E2) and estrone-sulphate (SO4E1) were measured both in tissue homogenates and in serum of MMT and IMC by EIA techniques in 42 non-inflammatory malignant mammary tumors (MMT) and in 14 inflammatory mammary carcinomas (IMC), prospectively collected from 56 female dogs. Androgen receptor (AR) and estrogen receptor alpha (ERα) and beta (ERβ) expression was studied using immunohistochemistry (strepavidin–biotin-peroxidase method) in samples of 32 MMT and 14 IMC, and counted by a computer image analyzer. IMC serum and tissue levels of androgens were significantly higher than MMT levels. Tissue content of estrogens was also significantly higher in IMC than in MMT. Serum values of SO4E1 were significantly higher in IMC, but serum levels of E2 were significantly lower in IMC compared to MMT cases. Medium-high androgen receptor intensity was observed in 64.28% of IMC and 40.62% of MMT. No important differences were found between ERα expression in IMC (100% negative) and MMT (90% negative). ERβ and AR were intensely expressed in highly malignant inflammatory mammary carcinoma cells. To our knowledge, this is the first report relative to AR immunohistochemistry in canine mammary cancer and to estrogens or androgens in serum of dogs with benign or malignant mammary tumors.Item Steroid pathway and oestrone sulphate production in canine inflammatory mammary carcinoma(The Journal of Steroid Biochemistry and Molecular Biology, 2007) Sánchez-Archidona, Ana R.; Jiménez Martínez, María De Los Ángeles; Pérez Alenza, María De Los Dolores; Silván Granado, Gema; Illera Del Portal, Juan Carlos; Peña Fernández, Laura Luisa; Dunner Boxberger, Helene SusanaSpontaneous canine mammary inflammatory carcinoma (IMC) shares epidemiologic, histopathologic and clinical characteristics with the inflammatory breast carcinoma (IBC) disease in humans. We have analysed the steroids levels in serum and in tissue homogenates of IMC, the expression of two of their receptors (androgen and β-estrogen) and of three enzymes included in the steroidogenesis pathway (aromatase (CYP19A1), steroid sulphatase (STS) and estrogen sulfotransferase (EST)) trying to explain the specific accumulation of steroids in IMC tissues generating deposits in the form of lipid droplets whose presence can be attributed to steroids secreted by IMC cells. According to our working hypothesis, oestrone sulphate would be the main component of these lipid droplets. The presence of these steroid deposits would contribute to the intense proliferation and invasive behaviour of IMC and IBC, although their involvement in angiogenesis is yet to be demonstrated.Item Comparison of non-selective adrenocorticolysis with mitotane or trilostane for the treatment of dogs with pituitary-dependent hyperadrenocorticism(Veterinary Record, 2007) Clemente, Mónica; Andrés Gamazo, Paloma Jimena De; Arenas, Carolina; Melián, Carlos; Morales, Manuel; Pérez Alenza, María De Los DoloresForty-six dogs with pituitary-dependent hyperadrenocorticism were treated with mitotane by the non-selective adrenocorticolysis protocol and 40 were treated twice a day with trilostane. The treatment groups were compared by chi-squared tests, and survival data were analysed using Kaplan-Meier survival plots and a Cox proportional hazard method. The non-selective adrenocorticolysis protocol was very effective (89 per cent), its toxicity was moderate (24 per cent) and there were fewer recurrences (29 per cent) than reported with the classical selective adrenocorticolysis protocol (58 per cent). In a multivariate model, age and bodyweight at diagnosis were significantly negatively correlated with survival time. The median survival time of the dogs treated with trilostane twice a day (900 days) was longer (P=0·05) than that of the dogs treated with mitotane (720 days).Item Membranous glomerulonephritis in the Iberian lynx (Lynx pardinus)(Veterinary Immunology and Immunopathology, 2008) Jiménez Martínez, María De Los Ángeles; Sánchez Maldonado, María Belén; Pérez Alenza, María De Los Dolores; García, Pilar; López, Jose Vicente; Rodriguez, Alejandro; Muñoz, Álvaro; Martínez, Fernando; Vargas, Astrid; Peña Fernández, Laura LuisaThe Iberian lynx is the most endangered felid species in the world, confined nowadays to two isolated metapopulations in the southwest of Spain, where less than 200 individuals survive. Little is known about the diseases that affect these animals in the wild or in captivity. Kidney samples from necropsies of 27 Iberian lynxes, wild and captive, were examined by histopathology, immunohistochemistry (IgG, IgM, IgA, laminin, type IV collagen, and fibronectin), electron microscopy (n = 8) and immunogold labelling for IgM, IgG and IgA in one case, in order to characterize the glomerulopathy prevalent in this species. Urinalyses from records were available for 9 of the necropsied animals and blood and urine samples from 23 free ranging and captive Iberian lynxes were prospectively obtained in order to evaluate the renal function of the living population. A focal, diffuse membranous glomerulonephritis (MGN) that progressed with age was diagnosed in all but one of the animals in different stages not associated to concurrently known infectious diseases. Positive immunoexpression of IgM and IgG was observed in the glomerular capillary basement membranes and intramembranous electron-dense deposits, compatible with immune complexes (ICs) were seen with electron microscopy. The immunogold labelling was also positive for IgM and IgG in the electron-dense areas. The serum biochemistry and urinalyses also revealed signs of mild chronic kidney disease in 16 of the 23 animals evaluated. In conclusion, the membranous glomerulopathy affecting the Iberian lynx is a progressive disease of immune origin. We postulate a possible genetic predisposition towards the disease, enhanced by inbreeding and a possible connection to an immune-mediated systemic disease.Item Influencia de la nutrición : alteraciones genéticas y aspectos clínicos en los tumores mamarios caninos(2002) Pérez Alenza, María De Los Dolores; Rutteman, Gerard R.; Peña Fernández, Laura; Misdorp, Wim; Beynen, Anton CEn el presente trabajo se ha realizado un estudio sobre aspectos clínicos genéticos y nutricionales en 102 perros con tumores mamarios y 89 animales control. El análisis de adn tumoral mediante citología de flujo ha revelado que la incidencia de anuploidia es superior en los tumores malignos que en las displasias y tumores benignos. Se ha observado hipoploidia en un 7,3% de las neoplasias. El valor de la fracción de fase s es mayor en tumores malignos. Los valores mas elevados de fracción de fase s corresponden a tumores de alto grado de malignidad histologíca. El valor de fase s es inferior en animales con estadio clínico local que con afectación ganglionar. Por otro lado, la existencia de obesidad durante la etapa juvenil y durante un periodo de 1 año anterior al diagnostico se relaciona con una mayor incidencia de neoplasias mamarias. El consumo de dietas caseras, de carnes de vacuno y porcino en lugar de dietas comerciales y carne de aves se relaciona con un incremento en la incidencia. El análisis del perfil de ácidos grasos subcutáneos así como el valor de selenio serico no revelan diferencias entre los animales control y los casos. Los animales con tumores presentan niveles de retinol inferior a los animales controlItem Survival time of dogs with inflammatory mammary cancer treated with palliative therapy alone or palliative therapy plus chemotherapy(Veterinary Record, 2009) Clemente, Mónica; Andrés Gamazo, Paloma Jimena De; Peña Fernández, Laura Luisa; Pérez Alenza, María De Los DoloresSeven of 30 female dogs diagnosed with inflammatory mammary cancer were given chemotherapy and palliative treatment, and the other 23 received only palliative treatment. The median survival time of the seven dogs given chemotherapy was 57 days, compared with 35 days for the 23 given only palliative treatment.Item First description of feline inflammatory mammary carcinoma: clinicopathological and immunohistochemical characteristics of three cases(2004) Pérez Alenza, María De Los Dolores; Jiménez Martínez, María De Los Ángeles; Nieto Ruiz De Zárate, Ana Isabel; Peña Fernández, Laura LuisaINTRODUCTION: Inflammatory breast cancer is a special type of locally advanced mammary cancer that is associated with particularly aggressive behaviour and poor prognosis. The dog was considered the only natural model in which to study the disease because, until now, it was the only species known to present with inflammatory mammary carcinoma (IMC) spontaneously. In the present study we describe clinicopathological and immunohistochemical findings of three cats with IMC, in order to evaluate its possible value as an animal model. METHODS: We prospectively studied three female cats with clinical symptoms of IMC, identified over a period of 3 years. Clinicopathological and immunohistochemical evaluations of Ki-67, and oestrogen, progesterone and androgen receptors were performed. RESULTS: All three animals presented with secondary IMC (postsurgical) characterized by a rapid onset of erythema, severe oedema, extreme local pain and firmness, absence of subjacent mammary nodules, and involvement of extremities. Rejection of the surgical suture was observed in two of the cats. Histologically, highly malignant papillary mammary carcinomas, dermal tumour embolization of superficial lymphatic vessels, and severe secondary inflammation were observed. The animals were put to sleep at 10, 15 and 45 days after diagnosis. Metastases were detected in regional lymph nodes and lungs in the two animals that were necropsied. All tumours had a high Ki-67 proliferation index and were positive for oestrogen, progesterone and androgen receptors. CONCLUSION: Our findings in feline IMC (very low prevalence, only secondary IMC, frequent association of inflammatory reaction with surgical suture rejection, steroid receptor positivity) indicate that feline IMC could be useful as an animal model of human inflammatory breast cancer, although the data should be considered with caution.