Distribuição do ácido hialurônico na pele de ratas ooforectomizadas após administração de glicosamina sulfato e condroitim sulfato

• Ano de defesa: 2009
• Autor(a) principal: Moura, Márcio Luis Alves [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: Acido hialuronico; Glucosamina; Ovariectomia; Ratos; Sulfatos de condroitina; Pele
• Link de acesso: http://repositorio.unifesp.br/handle/11600/9339

Several factors contribute to the skin changes that are associated with menopause, including chronologic aging of the organism and the withdrawal of steroid hormones. It is known that sexual hormone suppression leads to alterations in the skin extracellular matrix. Hyaluronic acid (HA) high molecular weight glycosaminoglycan and a major component of the extracellular matrix. In the skin, which contains 50% of the total body HA. Several biological functions have been assigned to HA, among them the stabilization of the extracellular matrix, water homeostasis, joint lubrification, proliferation cell and regulation of the cellular activities. Glucosamine sulfate (Glc) and chondroitin sulfate (CS), both components to the extracellular matrix, have been used for treatment of osteoarthritis. The Glucosamine sulfate is an amino monosaccharide that is present in all human tissues and is precursors for the biosynthesis of the glycosaminoglycan and ploteoglycans. The chondroitin sulfate is a glycosaminoglycan formed for repeating disaccharide units containing galactosamine sulfate and glucuronic acid. However, the glucosamine sulfate and its association with chondroitin sulfate (Glc/CS) and their effects on the aged skin tissue are still unknown. This study was done to observe the profile of the hyaluronic acid in the skin after ovariectomy in rats treated and untreated with Glc or Glc/CS. Wistar rats (n = 50) were divided in two groups: not ovariectomized (control) and ovariectomized (experimental). The animals received by gavage either water (0,25ml) or 0,0214 mg/g of animal weight of Dinaflex® 1,5g (glucosamine sulfate) or Condroflex® 1,5g + 1,2g (glucosamine sulfate + chondroitin sulfate) during 45 and 60 days. Their skins were dissected and analyzed the following parameters: 1) thickness of dermis and epidermis; 2) histochemical localization of the hyaluronic acid; 3) biochemical quantification of the hyaluronic acid. Through this study we conclude that: 1) ovariectomized animals decreased the amount of hyaluronic acid in the skin; 2) ovariectomized animals and treated with water or Glc or Glc/CS for 45 and 60 days to administration they do not present alterations in the acid hyaluronic concentration: 3) the therapeutical administration of these composites must take in consideration the peculiarities of each tissue.