Histopatologia e imunoistoquímica do bulbo do olho de equinos (Equus caballus, Linnaeus, 1758) soropositivos ou soronegativos para leptospirose

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeitos da ciclosporina, fenitoína e nifedipina sobre a síntese e degradação de colágeno da gengiva de macacos-prego (Cebus apella): estudo histoquímico e através de RT-PCR

Pós-graduação em Odontologia - FOA

Regulação da expressão de fatores secretados pelo oócito (FSOs) e seus receptores durante a maturação in vitro (MIV) bovina e ações no controle da expressão de cumulus

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo comparativo dos efeitos de esculetina, 4-metilesculetina, prednisolona e sulfassalazina no modelo de doença inflamatória intestinal induzida por TNBS em ratos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Efeito da hipertensão e do atenolol sobre a atividade salivar e a microdureza dental: estudo experimental em filhotes de ratas espontaneamente hipertensas (SHR)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência do consumo do café (com e sem cafeína) ou da cafeína isolada sobre a fibrose e a promoção da hepatocarcinogênese química em ratos Wistar machos

Pós-graduação em Patologia - FMB

Influência do extrato de chá verde na remodelação cardíaca após o infarto agudo do miocárdio

Pós-graduação em Fisiopatologia em Clínica Médica - FMB

Influência da suplementação de vitamina D na remodelação ventricular após o infarto do miocárdio

Pós-graduação em Fisiopatologia em Clínica Médica - FMB

Aspectos clínicos, histopatológicos e moleculares da dermatosparaxia em ovinos White Dorper

Dermatosparaxis in animals is an autosomal recessive disorder of the connective-tissue clinically characterized by skin fragility and hiperextensibility. The disease in White Dorper sheep is caused by mutation (c.421G>T) in the ADAM metalloproteinase with thrombospondin type 1 motif, 2 (ADAMTS2) gene. This study describes the dermatological, histological and the molecular findings of the dermatosparaxis in White Dorper sheep from a herd located in the center-west of São Paulo State. The herd consisted of one ram, four ewe and their lambs. In this herd two lambs had clinical signs consistent with dermatosparaxis. Histopathological evaluation of the affected skin of these two animals also revealed consistent findings with dermatosparaxis, characterized by dysplasia of the collagen, which were arranged in small and fragmented collagen bundles and with foci of degeneration of collagen. Prominent cutaneous appendages and severe hemorrhagic focus in dermis region associated with mild neutrophilic infiltrate in the deep dermis. PCR using DNA blood and specific primers to amplify the mutation region c.421G>T was optimized in order to perform molecular diagnosis of the disease. The direct sequencing of the PCR products proved that the two clinically affected animals had the mutation responsible for dermatosparaxis, previously described for this breed and allowed the definitive diagnosis of the disease. This is the first report of the dermatosparaxis in White Dorper sheep in Brazil and the methodology used to confirm the diagnosis could be used in future studies to assess the prevalence of this mutation in Brazil, allowing the adoption of measures to prevent the spread of this mutation in the Brazilian White Dorper herd.

Efeito da amoxicilina e do fluoreto no desenvolvimento do esmalte dentário de ratos

Pós-graduação em Ciências Odontológicas - FOAR

Vitamin D Induces Increased Systolic Arterial Pressure via Vascular Reactivity and Mechanical Properties

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

A Novel Chemically Modified Curcumin Reduces Severity of Experimental Periodontal Disease in Rats: Initial Observations

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Protective effect of gamma-tocopherol-enriched diet on N-methyl-N-nitrosourea-induced epithelial dysplasia in rat ventral prostate

Despite recent advances in understanding the biological basis ofprostate cancer (PCa), the management of this disease remains a challenge. Chemoprotective agents have been usedto protect against or eradicateprostatemalignancies. Here, we investigated the protective effect of -tocopherol on N-methyl-N-nitrosourea (MNU)-induced epithelial dysplasia in the rat ventral prostate (VP). Thirty-two male Wistar rats were divided into four groups (n=8): control (CT): healthy control animals fed a standard diet; control+-tocopherol (CT+T): healthy control animals without intervention fed a -tocopherol-enriched diet (20mg/kg); N-methyl-N-nitrosourea (MNU): rats that received a single dose of MNU (30mg/kg) plus testosterone propionate (100mg/kg) and were fed a standard diet; and MNU+-tocopherol (MNU+T): rats that received the same treatment of MNU plus testosterone and were fed with a -tocopherol-enriched diet (20mg/kg). After 4months, the VPs were excised to evaluate morphology, cell proliferation and apoptosis, as well as cyclooxygenase-2 (Cox-2), glutathione-S-transferase-pi (GST-pi) and androgen receptor (AR) protein expression, and matrix metalloproteinase-9 (MMP-9) activity. An increase in the incidence of epithelial dysplasias, such as stratified epithelial hyperplasia and squamous metaplasia, in the MNU group was accompanied by augmented cell proliferation, GST-pi and Cox-2 immunoexpression and pro-MMP-9 activity. Stromal thickening and inflammatory foci were also observed. The administration of a -tocopherol-enriched diet significantly attenuated the adverse effects of MNU in the VP. The incidence of epithelial dysplasia decreased, along with the cell proliferation index, GST-pi and Cox-2 immunoexpression. The gelatinolytic activity of pro-MMP-9 returned to the levels observed for the CT group. These results suggest that -tocopherol acts as a protective agent against MNU-induced prostatic disorders in the rat ventral prostate.

Effects of maternal diabetes on male offspring: high cell proliferation and increased activity of MMP-2 in the ventral prostate

This study presents a comprehensive view of the histological and functional status of the prostate of adult rat offspring of mothers subjected to gestational diabetes induced by alloxan. The ventral prostate of male adult offspring of diabetic (DP) or normal (CP) mothers was evaluated for collagen fibres, cell death, fibroblasts, smooth muscle cells, cell proliferation, matrix metalloproteinases (MMPs), androgen receptors (AR), transforming growth factor beta 1 (TGF beta-1), catalase and total antioxidant activity. The prostates of DP animals were lower in weight than those of the CP group. The DP group also exhibited hyperglycaemia and hypotestosteronemia, higher cell proliferation and AR expression, a reduction in alpha-actin (possibly interfering with the reproductive function of the prostate), and enhanced activity of MMP-2, although the absolute content of MMP-2 was lower in this group. These findings were associated with increased TGF beta-1 and decreased collagen distribution. The prostates of DP rats additionally exhibited reductions in catalase and total antioxidant activity. Thus, rats developing in a diabetic intrauterine environment have glycaemic and hormonal changes that impact on the structure and physiology of the prostate in adulthood. The increased AR expression possibly leads to elevated cell proliferation. Stromal remodelling was characterized by enhanced activity of MMP-2 and collagen degradation, even with increased TGF beta-1 activation. These changes associated with increased oxidative stress might interfere with tissue architecture and glandular homeostasis.

Extracellular matrix remodeling of the testes through the male reproductive cycle in Teleostei fish

During the fish reproductive cycle, testes undergo morphological changes related to germinal epithelium and remodeling of extracellular matrix components (ECM). ECM is degraded mainly by action of matrix metalloproteinases (MMPs). Due to the natural renewal of ECM in fish testes, we choose Pimelodus maculatus to study remodeling of ECM throughout reproductive cycle, using picrosirius (to identify type I, II, III collagen) and reticulin (type III collagen), and to immunolocalize MT1-MMP (membrane type 1-matrix metalloproteinase) and MMP-2 in testis cells. Testes were classified in four reproductive phases: regenerating, development, spawning capable and regressing. Picrosirius and reticulin demonstrated a differential distribution of total collagen fibers during the reproductive cycle. Immunohistochemistry showed MT1-MMP only in acidophilic granulocyte cells mainly inside blood vessels, in connective tissue of capsule close to the germinal compartment, and also infiltrated in interstitial connective tissue. MMP-2 was detected in fibroblast and endothelial cells of interstitial and capsule blood vessels, in epithelial cells of capsule, and in acidophilic granulocyte cells at same description for MT1-MMP. The fish testes ECM were remodeled throughout reproductive cycle in according to morphophysiological alterations. During reproductive season (spawning capable), the interstitium increased in total collagen fibers (type I, II, III). After spermiation period (regression and regenerating), the amount of collagen fibers decreased in response to action of MMPs on collagen degradation and other interstitial components (not assessed in this study). MMPs seem to be indispensable components for natural cyclic events of ECM remodeling of fish testes and for guarantee tissue homeostasis throughout reproductive cycle.