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1.
In Vitro Cell Dev Biol Anim ; 45(7): 361-70, 2009.
Artigo em Inglês | MEDLINE | ID: mdl-19347411

RESUMO

Selective knockdown of phosphatase and tensin homolog (PTEN) has been recently shown to increase life long accumulation of bone and its ability to increase osteoblast lifespan. In order to determine how loss of PTEN function affects osteoblast differentiation, we created cell lines with stable knockdown of PTEN expression using short hairpin RNA vectors and characterized several clones. The effect of deregulated PTEN in osteoblasts was studied in relationship to cell proliferation and differentiation. Downregulation of PTEN initially affected the cell's attachment and spreading on plastic but cells recovered after a brief period of time. When cell proliferation was determined using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays, we noticed a small but significant increase in growth rates with PTEN reduction. The size of individual cells appeared larger when compared to control cells. Differentiation properties of these osteoblasts were increased as evidenced by higher expression of several of the bone markers tested (alkaline phosphatase, osteocalcin, osterix, bone morphogenetic protein 2, Cbfa1, osteoprotegerin, and receptor activator of NF-kappaB ligand) and their mineralization capacity in culture. As stabilization of beta-catenin is known to be responsible for growth deregulation with PTEN loss in other cell types, we investigated the activation of the canonical Wnt pathway in our cell lines. Immunofluorescence staining, protein expression in subcellular fractions for beta-catenin, and assays for activation of the canonical Wnt/beta-catenin signaling were studied in the PTEN downregulated cells. There was an overall decrease in beta-catenin expression in cells with PTEN knockdown. The distribution of beta-catenin was more diffuse within the cell in the PTEN-reduced clones when compared to controls where they were mostly present in cell borders. Signaling through the canonical pathway was also reduced in the PTEN knockdown cells when compared to control. The results of this study suggest that while decreased PTEN augments cell proliferation and positively affects differentiation, there is a decrease in beta-catenin levels and activity in osteoblasts. Therefore, at least in osteoblasts, beta-catenin is not responsible for mediating the activation of osteoblast differentiation with reduction in PTEN function.


Assuntos
Regulação para Baixo , Osteoblastos/metabolismo , PTEN Fosfo-Hidrolase/genética , beta Catenina/metabolismo , Animais , Diferenciação Celular/genética , Linhagem Celular Tumoral , Proliferação de Células , Forma Celular , Osteoblastos/citologia , PTEN Fosfo-Hidrolase/metabolismo , Ratos
2.
Rev. méd. (La Paz) ; 5(2): 16-20, jul. 2007. ilus
Artigo em Espanhol | LILACS | ID: lil-738119

RESUMO

La Violencia intrafamiliar implica un conjunto de acciones que culminan en violencia domestica, que se traduce en daños psicológicos y/o físicos hacia componentes del grupo familiar. .El presente estudio analiza la prevalencia de Violencia intrafamiliar (VIF) en el Hospital La Paz. La Violencia intrafamiliar puede entenderse desde la Atención Primaria como un problema de salud que puede ser intervenido de varias formas, lo importante será tratar en inicio con promoción y prevención desde el primer contacto con el paciente. El trabajo consistió en tres fases: 1. RECOLECCION de información; 2. ANALISIS 3. SEGUIMIENTO a las personas que habrían sufrido VIF y cual el grado de disfunción que generó en sus familias. Se utilizaron como instrumentos de medición de VIF el APGAR familiar y la ficha epidemiológica de violencia. La prevalencia obtenida fue de 0.75 casos por 1000 pacientes, el grupo etáreo mas afectado fue el de 25 a 45 años en un 49%. En conclusión, 75 pacientes de cada 1000 denuncian algún grado de VIF y permiten su seguimiento, ya que un gran porcentaje denunció VIF y no volvió.


Assuntos
Comportamento
3.
Rev. méd. (La Paz) ; 5(2): 63-67, jul. 2007. ilus
Artigo em Espanhol | LILACS | ID: lil-738126

RESUMO

Comprobado el hecho de que los anestésicos utilizados en la practica odontológica, no tienen efectos adversos para la evolución normal del embarazo en la mujer, se elabora el presente trabajo realizado en 280 mujeres embarazadas que acudieron a la consulta prenatal, presentando diversas patologías odontológicas, especialmente emergencias odontológicas caracterizadas por dolor, las que luego del tratamiento bajo anestesia odontológica se comprobó que no presentaban ninguna alteración que pudiera amenazar la evolución normal del embarazo, resultado que recomienda la atención integral odontológica en la embarazada, sin el temor de amenazar su gestación.


Assuntos
Serviços de Saúde Mental
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