Estudo das interações de peptídeos antimicrobianos e sistemas miméticos de membrana por dinâmica molecular

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Modelo experimental de conjuntivite alérgica: efeito do tratamento farmacológico com a proteína anti-inflamatória galectina - 1

Pós-graduação em Genética - IBILCE

Diabetes reduces mesenchymal stem cells in fracture healing through a TNF alpha-mediated mechanism

Diabetes interferes with bone formation and impairs fracture healing, an important complication in humans and animal models. The aim of this study was to examine the impact of diabetes on mesenchymal stem cells (MSCs) during fracture repair.Fracture of the long bones was induced in a streptozotocin-induced type 1 diabetic mouse model with or without insulin or a specific TNF alpha inhibitor, pegsunercept. MSCs were detected with cluster designation-271 (also known as p75 neurotrophin receptor) or stem cell antigen-1 (Sca-1) antibodies in areas of new endochondral bone formation in the calluses. MSC apoptosis was measured by TUNEL assay and proliferation was measured by Ki67 antibody. In vitro apoptosis and proliferation were examined in C3H10T1/2 and human-bone-marrow-derived MSCs following transfection with FOXO1 small interfering (si)RNA.Diabetes significantly increased TNF alpha levels and reduced MSC numbers in new bone area. MSC numbers were restored to normal levels with insulin or pegsunercept treatment. Inhibition of TNF alpha significantly reduced MSC loss by increasing MSC proliferation and decreasing MSC apoptosis in diabetic animals, but had no effect on MSCs in normoglycaemic animals. In vitro experiments established that TNF alpha alone was sufficient to induce apoptosis and inhibit proliferation of MSCs. Furthermore, silencing forkhead box protein O1 (FOXO1) prevented TNF alpha-induced MSC apoptosis and reduced proliferation by regulating apoptotic and cell cycle genes.Diabetes-enhanced TNF alpha significantly reduced MSC numbers in new bone areas during fracture healing. Mechanistically, diabetes-enhanced TNF alpha reduced MSC proliferation and increased MSC apoptosis. Reducing the activity of TNF alpha in vivo may help to preserve endogenous MSCs and maximise regenerative potential in diabetic patients.

Beneficial effect of annexin A1 in a model of experimental allergic conjunctivitis

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

Role of peptide peptide interactions in aggregation: protonectins observed in equilibrium and replica exchange molecular dynamics simulations

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

Structural characterization of novel chemotactic and mastoparan peptides from the venom of the social wasp Agelaia pallipes pallipes by high-performance liquid chromatography/electrospray ionization tandem mass spectrometry

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Peptidome profiling of venom from the social wasp Polybia paulista

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

Structure-activity relationship of mastoparan analogs: effects of the number and positioning of Lys residues on secondary structure, interaction with membrane-mimetic systems and biological activity

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

Proteômica como estratégia para estudos dos mecanismos de ativação de mastócitos de ratos causados pelo peptídeo Protopolybia MP-III

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

Importância dos mastócitos na patogênese da distrofia muscular de Duchenne em cães Golden Retriever

Pós-graduação em Medicina Veterinária - FCAV

Alterações no fenômeno da coagulação na vigência do mastocitoma cutâneo em cães

Pós-graduação em Medicina Veterinária - FCAV

Síntese e caracterização de pequenos peptídeos lineares do veneno de Tityus serrulatus (Buthidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo retrospectivo (2007-2011) da casuística de cães com mastocitomas cutâneos atendidos em um hospital-escola

Neoplasms of mast cell origin are uncommon in most animal species. Although cases of cutaneous mastocitoma (CM) are rare in humans, it is the second most diagnosed cancer in dogs, accounting for approximately 20% of cutaneous tumors in this species. The age group most frequently affected is between eight and nine years, but it may occur in animals up to three weeks old. This study aimed to describe the epidemiological, hematological and histopathological characteristics of 73 dogs with cutaneous mast cell tumors attended between 2007 and 2011 by the Oncology Service of a teaching hospital in the state of São Paulo. Data collected included race, age, sex, weight, skin region affected, blood tests results at the first consultation and histopathological grading of dogs diagnosed with this neoplasia.

Inibidores de tirosina-quinase no tratamento de mastocitomas cutâneos em cães: revisão

The mast cell tumor (MCT) is the second most common type of tumor in dogs. It is characterized by uncontrolled proliferation of mast cells in the skin. Treatment involves surgical resection, chemotherapy and radiotherapy. Recently, new treatment protocols have been developed, such as the use of tyrosine kinase inhibitors. With the increasing knowledge about the genome and the evolution of methods in molecular genetics, drugs with specific molecular targets are surely going to become promising therapeutic modalities in the near future. Besides being involved in the normal cell cycle, some studies suggest that tyrosine kinases have a fundamental role in neoplastic processes. Therefore, some strategies such as the development of antibodies anti-receptors for tyrosine kinases and small-molecule tyrosine kinase receptor inhibitors have been developed in an attempt to inhibit tumor development. The purpose of this review is to describe the use of tyrosine kinase inhibitors in the treatment of mast cell tumors in dogs.

Estudo peptídico e determinação do perfil de metabólitos de venenos de escorpiões da família buthidae: Tityus serrulatus, Tityus bahiensis e Tityus obscurus

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)