RESUMO
The objectives of this study were to evaluate the effect of different functional groups of sulfate, amine, and hydroxyl and/or their ionized groups on in vitro antioxidant capacities of low-molecular-weight polysaccharides (LMPS) prepared from agar (LMAG), chitosan (LMCH), and starch (LMST), respectively, and to elucidate their structure-activity relationship. Ascorbic acid and ethylenediaminetetraacetic acid (EDTA) were used as positive controls. The in vitro antioxidant capacities of LMAG and LMCH were higher than that of LMST in the DPPH radical, superoxide radical, hydrogen peroxide, and nitric oxide radical scavenging and ferrous metal-chelating capacities. The different scavenging capacities may be due to the combined effects of the different sizes of the electron-cloud density and the different accessibility between free radical and LMPS, which, in turn, depends upon the different hydrophobicities of the constituent sugars.
Assuntos
Antioxidantes/farmacologia , Polissacarídeos/química , Polissacarídeos/farmacologia , Ágar/química , Ágar/farmacologia , Compostos de Bifenilo , Quitosana/química , Quitosana/farmacologia , Compostos Ferrosos/química , Sequestradores de Radicais Livres/farmacologia , Interações Hidrofóbicas e Hidrofílicas , Quelantes de Ferro/química , Peso Molecular , Picratos , Amido/química , Amido/farmacologia , Relação Estrutura-AtividadeRESUMO
OBJECTIVE: To evaluate the expression of DAZAP1 (deleted in azoospermia-associated protein 1) in rat and human ovaries. DESIGN: Experimental study. SETTING: University hospital. PATIENT(S): Twelve corpus luteum (CL) specimens were collected during operation, either by laparoscopic surgery for CL rupture or by laparotomy for benign gynecologic conditions. INTERVENTION(S): Surgical excision of 12 human CL. MAIN OUTCOME MEASURE(S): Proteins analyzed by immunohistochemical staining, Western blotting, and co-immunoprecipitation experiments. RESULT(S): DAZAP1 is expressed in rat and human luteal cells. Expression of DAZAP1 decreases with advancing stages of CL. Co-immunoprecipitation experiments show in vivo interaction of DAZ-like (DAZL) protein with DAZAP1 in the ovarian tissues. CONCLUSION(S): The expression patterns of DAZAP1 and DAZL are identical within rat and human ovaries. In mammalian species, DAZAP1 may be involved in diverse reproductive functions, ranging from cell cycle regulation and maturation of oocytes to differentiation of luteal cells.
