RESUMO
Aqueous extract of human placenta, used as wound healer, has shown significant cell adhesion property on mouse peritoneal macrophages and P388D1 cultured macrophage cell line. This property was offered primarily by fibronectin type III like peptide present in the extract and is comparable to fibronectin on a molar basis. The peptide induce adhesion of cell through cell surface receptors having K(d) = 2.8 +/- 0.9 x 10(-5) M suggesting weak binding. This is in support of integrins receptors that typically exhibit low affinities. Cell adhesion was partially inhibited by Arg-Gly-Asp (RGD) peptide, anti-beta1 integrin suggesting that integrin beta1 receptors have roles to play in the process.
Assuntos
Animais , Integrina beta1/efeitos dos fármacos , Adesão Celular/efeitos dos fármacos , Feminino , Fibronectinas/farmacologia , Humanos , Macrófagos Peritoneais/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos BALB C , Oligopeptídeos/farmacologia , Extratos Placentários/farmacologia , Água/química , Cicatrização/efeitos dos fármacosRESUMO
Significant increase of liver succinic dehydrogenase (SDH, EC 1.3.99.1) activity was produced by carrageenin-induced edema in rats. Pretreatment with human placental extract inhibited the increased liver SDH activity in a dose-dependent manner. Placental extract was found to have little or no effect on the liver SDH activity in normal rats. Furthermore, heat-induced erythrocyte lysis was inhibited to a substantial extent by the extract and was found to be dose-responsive. However, adenosine diphosphate (ADP)-induced platelet aggregation and trypsin activity were not changed by the placental extract in vitro. The study indicates that the membrane stabilization and depletion of adenosine triphosphate (ATP) synthesis may contribute to antiinflammatory effect of the extract.
Assuntos
Animais , Edema/induzido quimicamente , Hemólise/efeitos dos fármacos , Humanos , Inflamação/enzimologia , Fígado/enzimologia , Masculino , Extratos Placentários/farmacologia , Agregação Plaquetária/efeitos dos fármacos , Ratos , Ratos Wistar , Succinato Desidrogenase/metabolismo , Tripsina/metabolismoRESUMO
The human uterotrophic placental factor (hUTPF) is a protein obtained from human term placentae and acts on uterine growth, mammary gland, and blastocyst development and implantation. In the present work, we further define some molecular characteristics of hUTPF using chromatographic, electrophoretic and immunochemical methods. It is concluded that in human term placenta a high molecular weight hUTPF is present, bound to albumin and immunoglobulins, which could represent a storage or transport form of this factor. hUTPF presents several molecular forms, one of them of 270 kDa and others of approximately 90 kDa and 27 kDa