RESUMO
The influence of FGF2 on the efficiency of cardiomyocytes differentiation of mesenchymal stem cells (MSC) of bone marrow induced by 5-azacetidine (5-aza) was studied. The effect of FGF2 developing by the 14th day after the combined action of a differentiating agent and growth factor was manifested in an increase in Mef2A, Mef2D and gene transcription and a rise of ionized Ca2+ concentration in cytoplasm keeping cell viability and proliferation activity. In the presence of FGF2 this approach provided cardiomyogenesis and the increase in the formation of early precursors of cardiomyocytes.
Assuntos
Diferenciação Celular , Fator 2 de Crescimento de Fibroblastos/farmacologia , Células-Tronco Mesenquimais/citologia , Miócitos Cardíacos/citologia , Animais , Azacitidina/farmacologia , Cálcio/metabolismo , Proliferação de Células , Células Cultivadas , Fatores de Transcrição MEF2/genética , Fatores de Transcrição MEF2/metabolismo , Células-Tronco Mesenquimais/efeitos dos fármacos , Células-Tronco Mesenquimais/metabolismo , Miócitos Cardíacos/efeitos dos fármacos , Miócitos Cardíacos/metabolismo , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , RatosRESUMO
Conditions for culturing and differentiation of human umbilical blood mononuclear cells in vitro were studied. The growth of mesenchymal stem cells was attained in 31 of 54 (57.4%) umbilical blood samples and morphological and immunophenotypical authenticity of these cells was confirmed. Stimulatory effects of 20% AB(IV) human serum and transforming growth factor-beta (TGF-beta) on the growth of mesenchymal stem cells were demonstrated. Osteogenic cells formed in the presence of differentiation factors ascorbic acid, dexamethasone, and beta-glycerophosphate, while chondrogenic cells developed in the presence of dexamethasone, ascorbic acid, and TGF-beta. Differentiation of mesenchymal stem cells was confirmed by histochemical and molecular genetic tests.
Assuntos
Diferenciação Celular/fisiologia , Condrócitos/fisiologia , Sangue Fetal/citologia , Células-Tronco Mesenquimais/fisiologia , Osteoblastos/fisiologia , Forma Celular , Células Cultivadas , Condrócitos/citologia , Condrogênese/fisiologia , Humanos , Células-Tronco Mesenquimais/citologia , Osteoblastos/citologia , Osteogênese/fisiologiaRESUMO
A cholecystectomy was performed on a 10-year-old spayed female mixed-breed dog with chronic weight loss, persistently increased liver enzyme activities, and cholecystomegaly identified by ultrasonographic examination. A subsequent diagnosis of a biliary carcinoid was made based on a neuroendocrine-type histologic pattern, cytoplasmic argyrophilia by Grimelius staining, immunopositivity for chromogranin A, and the ultrastructural finding of cytoplasmic secretory granules in neoplastic cells. Extrahepatic biliary carcinoid tumors are rare tumors of humans and have not been documented in domestic animals.