RESUMO

Mesenchymal stem cells (MSCs), obtained from several anatomical sites, have already been described, characterized and used in therapeutic models for tissue repair. The umbilical cord mesenchymal stem cells, represented by cells from arteries and veins walls, as well as Wharton's jelly are easy to be obtained, highly available, require no invasive procedure, do not present risk to donors and do not present ethical limitation. The aim of this research was to analyze the plasticity of Wharton's jelly mesenchymal stem cells (WJ-MSCs) of goat, evaluating their behavior in vitro and characterizing them immunophenotypically. Thus, tests were performed on colony forming units, viability and cell growth curve, flow cytometry analysis and plasticity potential. Goat umbilical cord matrix cells exhibited fibroblastoid morphology with colony formation and self-renewal ability, always maintaining their undifferentiated state up to the eighth passage (P8). The growth curve kinetics exhibited the LAG, LOG, and DECAY phases, without displaying a PLATEAU phase. The plasticity assay demonstrated positive differentiation for osteogenic, adipogenic and chondrogenic lines, characterized by the synthesis of intracytoplasmic granules or extracellular matrix with the presence of calcium, lipids and proteoglycans. Flow cytometry demonstrated the expression of CD90 and CD105; absence of CD14 expression. It is concluded that the cell population isolated from the Wharton's jelly of goat constitutes a representative sample of mesenchymal stem cells, with great possibilities in the field of regenerative and reproductive medicine.

Assuntos

RESUMO

Mesenchymal stem cells (MSC) reside in small numbers in many adult tissues and organs, and play an active role in the homeostasis of these sites. Goat derived multipotent MSC have been established from bone marrow, adipose tissues and amniotic fluid. Umbilical cord blood (UCB) is considered an important source of these cells. However, the MSC isolation from the goat UCB has not been demonstrated. Therefore, the aim of the present study was to isolate, culture and characterize goat umbilical cord blood derived mesenchymal stem cells. MSC were isolated from UCB by Ficoll-Paque density centrifugation and cultured in DMEM supplemented with 10% or 20% FBS. FACS analysis was performed and induction lineage differentiation was made to characterize these cells. They exhibited two different populations in flow cytometry, and revealed the positive expression of CD90, CD44 and CD105, but negative staining for CD34 in larger cells, and positive stained for CD90 and CD105, but negative for CD44 and CD34 in the smaller cells. MSC from goat UCB showed capability to differentiate into chondrocytes and osteoblasts when incubated with specific differentiation medium. Present study established that goat mesenchymal stem cells can be derived successfully from umbilical cord blood.(AU)

As células tronco mesenquimais (MSC) residem em pequenas quantidades em muitos tecidos e órgãos adultos, desempenhando um papel ativo na homeostase destes locais. O isolamento de MSC já foi demonstrado em amostras de medula óssea, tecido adiposo e fluido amniótico de cabras. O sangue de cordão umbilical é considerado uma fonte importante desse tipo de células. No entanto, até o presente momento, não foi demonstrado o isolamento de MSC provenientes do sangue de cordão umbilical de cabras. Dessa forma, o objetivo do presente estudo foi isolar, cultivar e caracterizar células tronco mesenquimais provenientes do sangue do cordão umbilical caprino. As MSC foram isoladas utilizando o gradiente de densidade Ficoll-Paque e cultivadas em DMEM suplementado com 10% ou 20% de FBS. A caracterização desse tipo celular foi realizada através de análise por citometria de fluxo e diferenciação em linhagens celulares mesodermais. A analise no citômetro de fluxo demonstrou a presença de duas populações distintas, um grupo com células maiores e outro com células menores; observando expressão positiva de CD90, CD44 e CD105, e negativa para CD34 nas células maiores; enquanto que as menores foram positivas para CD90 e CD105, mas negativas para CD44 e CD34. As células isoladas demonstraram capacidade de se diferenciar em condrócitos e osteoblastos quando incubadas com meio de diferenciação específico. O presente estudo demonstrou que células tronco mesenquimais podem ser obtidas com sucesso do sangue do cordão umbilical caprino.(AU)

Assuntos

RESUMO

Mesenchymal stem cells (MSC) reside in small numbers in many adult tissues and organs, and play an active role in the homeostasis of these sites. Goat derived multipotent MSC have been established from bone marrow, adipose tissues and amniotic fluid. Umbilical cord blood (UCB) is considered an important source of these cells. However, the MSC isolation from the goat UCB has not been demonstrated. Therefore, the aim of the present study was to isolate, culture and characterize goat umbilical cord blood derived mesenchymal stem cells. MSC were isolated from UCB by Ficoll-Paque density centrifugation and cultured in DMEM supplemented with 10% or 20% FBS. FACS analysis was performed and induction lineage differentiation was made to characterize these cells. They exhibited two different populations in flow cytometry, and revealed the positive expression of CD90, CD44 and CD105, but negative staining for CD34 in larger cells, and positive stained for CD90 and CD105, but negative for CD44 and CD34 in the smaller cells. MSC from goat UCB showed capability to differentiate into chondrocytes and osteoblasts when incubated with specific differentiation medium. Present study established that goat mesenchymal stem cells can be derived successfully from umbilical cord blood.(AU)

As células tronco mesenquimais (MSC) residem em pequenas quantidades em muitos tecidos e órgãos adultos, desempenhando um papel ativo na homeostase destes locais. O isolamento de MSC já foi demonstrado em amostras de medula óssea, tecido adiposo e fluido amniótico de cabras. O sangue de cordão umbilical é considerado uma fonte importante desse tipo de células. No entanto, até o presente momento, não foi demonstrado o isolamento de MSC provenientes do sangue de cordão umbilical de cabras. Dessa forma, o objetivo do presente estudo foi isolar, cultivar e caracterizar células tronco mesenquimais provenientes do sangue do cordão umbilical caprino. As MSC foram isoladas utilizando o gradiente de densidade Ficoll-Paque e cultivadas em DMEM suplementado com 10% ou 20% de FBS. A caracterização desse tipo celular foi realizada através de análise por citometria de fluxo e diferenciação em linhagens celulares mesodermais. A analise no citômetro de fluxo demonstrou a presença de duas populações distintas, um grupo com células maiores e outro com células menores; observando expressão positiva de CD90, CD44 e CD105, e negativa para CD34 nas células maiores; enquanto que as menores foram positivas para CD90 e CD105, mas negativas para CD44 e CD34. As células isoladas demonstraram capacidade de se diferenciar em condrócitos e osteoblastos quando incubadas com meio de diferenciação específico. O presente estudo demonstrou que células tronco mesenquimais podem ser obtidas com sucesso do sangue do cordão umbilical caprino.(AU)

Assuntos

RESUMO

ABSTRACT: Mesenchymal stem cells (MSC) reside in small numbers in many adult tissues and organs, and play an active role in the homeostasis of these sites. Goat derived multipotent MSC have been established from bone marrow, adipose tissues and amniotic fluid. Umbilical cord blood (UCB) is considered an important source of these cells. However, the MSC isolation from the goat UCB has not been demonstrated. Therefore, the aim of the present study was to isolate, culture and characterize goat umbilical cord blood derived mesenchymal stem cells. MSC were isolated from UCB by Ficoll-Paque density centrifugation and cultured in DMEM supplemented with 10% or 20% FBS. FACS analysis was performed and induction lineage differentiation was made to characterize these cells. They exhibited two different populations in flow cytometry, and revealed the positive expression of CD90, CD44 and CD105, but negative staining for CD34 in larger cells, and positive stained for CD90 and CD105, but negative for CD44 and CD34 in the smaller cells. MSC from goat UCB showed capability to differentiate into chondrocytes and osteoblasts when incubated with specific differentiation medium. Present study established that goat mesenchymal stem cells can be derived successfully from umbilical cord blood.

RESUMO: As células tronco mesenquimais (MSC) residem em pequenas quantidades em muitos tecidos e órgãos adultos, desempenhando um papel ativo na homeostase destes locais. O isolamento de MSC já foi demonstrado em amostras de medula óssea, tecido adiposo e fluido amniótico de cabras. O sangue de cordão umbilical é considerado uma fonte importante desse tipo de células. No entanto, até o presente momento, não foi demonstrado o isolamento de MSC provenientes do sangue de cordão umbilical de cabras. Dessa forma, o objetivo do presente estudo foi isolar, cultivar e caracterizar células tronco mesenquimais provenientes do sangue do cordão umbilical caprino. As MSC foram isoladas utilizando o gradiente de densidade Ficoll-Paque e cultivadas em DMEM suplementado com 10% ou 20% de FBS. A caracterização desse tipo celular foi realizada através de análise por citometria de fluxo e diferenciação em linhagens celulares mesodermais. A analise no citômetro de fluxo demonstrou a presença de duas populações distintas, um grupo com células maiores e outro com células menores; observando expressão positiva de CD90, CD44 e CD105, e negativa para CD34 nas células maiores; enquanto que as menores foram positivas para CD90 e CD105, mas negativas para CD44 e CD34. As células isoladas demonstraram capacidade de se diferenciar em condrócitos e osteoblastos quando incubadas com meio de diferenciação específico. O presente estudo demonstrou que células tronco mesenquimais podem ser obtidas com sucesso do sangue do cordão umbilical caprino.