RESUMO
Chronic kidney disease (CKD) is characterized by structural abnormalities and the progressive loss of kidney function. Extracellular vesicles (EVs) from human umbilical cord tissue (hUCT)-derived mesenchymal stem cells (MSCs) and expanded human umbilical cord blood (hUCB)-derived CD133+ cells (eCD133+) maintain the characteristics of the parent cells, providing a new form of cell-free treatment. We evaluated the effects of EVs from hUCT-derived MSCs and hUCB-derived CD133+ cells on rats with CDK induced by an adenine-enriched diet. EVs were isolated by ultracentrifugation and characterized by nanoparticle tracking analysis (NTA) and electron microscopy. The animals were randomized and divided into the MSC-EV group, eEPC-EV group and control group. Infusions occurred on the seventh and 14th days after CKD induction. Evaluations of kidney function were carried out by biochemical and histological analyses. Intense labeling of the α-SMA protein was observed when comparing the control with MSC-EVs. In both groups treated with EVs, a significant increase in serum albumin was observed, and the increase in cystatin C was inhibited. The results indicated improvements in renal function in CKD, demonstrating the therapeutic potential of EVs derived from MSCs and eCD133+ cells and suggesting the possibility that in the future, more than one type of EV will be used concurrently.
Assuntos
Vesículas Extracelulares , Células-Tronco Mesenquimais , Insuficiência Renal Crônica , Animais , Células Cultivadas , Vesículas Extracelulares/metabolismo , Sangue Fetal , Células-Tronco Mesenquimais/metabolismo , Ratos , Insuficiência Renal Crônica/metabolismo , Insuficiência Renal Crônica/terapiaRESUMO
BACKGROUND: Endothelial progenitor cells (EPCs) are immature cells able to proliferate and contribute to endothelial repair, vascular homeostasis, neovascularization, and angiogenesis. It therefore seems likely that circulating EPCs have therapeutic potential in ischemic and vascular diseases. In this study we evaluated the efficiency of EPC mobilization and collection by large volume leukapheresis in subjects with hematological diseases, treated with plerixafor in association with G-CSF. METHODS: Twenty-two patients with lymphoid malignancies underwent rHuG-CSF and plerixafor treatment followed by leukapheresis. Blood samples before and after treatment and apheresis liquid sample were taken and analyzed by flow cytometry in order to quantified EPC. RESULTS: The percentage of CD34+ cells and EPCs among circulating total nuclear cells (TNCs) increased significantly by approximately 2-fold and 3-fold, respectively, after plerixafor treatment. Consequently, the absolute number of CD34+ cells and EPCs were increased 4-fold after plerixafor treatment. The median PB concentration of EPCs before and after treatment were 0.77/µL (0.31-2.15) and 3.41/µL (1.78-4.54), respectively, P < .0001. The total EPCs collected per patient were 3.3×107 (0.8×107 -6.8×107 ). CONCLUSION: We have shown that plerixafor in combination with G-CSF allows the mobilization and collection of large amounts of EPCs along with CD34+ cells in lymphoid neoplasm patients. The possibility to collect and to store these cells could represent a promising therapeutic tool for the treatment of ischemic complications without the need of in vitro expansion.
Assuntos
Remoção de Componentes Sanguíneos , Ciclamos , Células Progenitoras Endoteliais , Compostos Heterocíclicos , Antígenos CD34/metabolismo , Benzilaminas , Células Progenitoras Endoteliais/metabolismo , Fator Estimulador de Colônias de Granulócitos/farmacologia , Fator Estimulador de Colônias de Granulócitos/uso terapêutico , Mobilização de Células-Tronco Hematopoéticas , Compostos Heterocíclicos/farmacologia , Compostos Heterocíclicos/uso terapêutico , HumanosRESUMO
Hyperbaric oxygen is a clinical treatment that contributes to wound healing by increasing fibroblasts proliferation, collagen synthesis, and production of growth factors, inducing angiogenesis and inhibiting antimicrobial activity. It also has been shown that hyperbaric oxygen treatment (HBO), through the activation of nitric oxide synthase promotes an increase in the nitric oxide levels that may improve endothelial progenitor cells (EPC) mobilization from bone marrow to the peripheral blood and stimulates the vessel healing process. However, cellular mechanisms involved in cell proliferation and activation of EPC after HBO treatment remain unknown. Therefore, the present work aimed to analyze the effect of HBO on the proliferation of pre-treated bone marrow-derived EPC with TNF-alpha. Also, we investigated the expression of ICAM and eNOS by immunochemistry, the production of reactive species of oxygen and performed an in vitro wound healing. Although 1h of HBO treatment did not alter the rate of in vitro wound closure or cell proliferation, it increased eNOS expression and decreased ICAM expression and reactive oxygen species production in cells pre-treated with TNF-alpha. These results indicate that HBO can decrease the inflammatory response in endothelial cells mediated by TNF-alpha, and thus, promote vascular recovery after injury.
Assuntos
Proliferação de Células/efeitos dos fármacos , Células Progenitoras Endoteliais/metabolismo , Oxigênio/farmacologia , Animais , Células da Medula Óssea/citologia , Movimento Celular/efeitos dos fármacos , Células Cultivadas , Células Progenitoras Endoteliais/citologia , Células Progenitoras Endoteliais/efeitos dos fármacos , Molécula 1 de Adesão Intercelular/metabolismo , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Óxido Nítrico Sintase Tipo III/metabolismo , Espécies Reativas de Oxigênio/metabolismo , Fator de Necrose Tumoral alfa/farmacologiaRESUMO
Bone marrow-derived stem cells (BMDSCs) play an essential role in organ repair and regeneration. The molecular mechanisms by which hormones control BMDSCs proliferation and differentiation are unclear. Our aim in this study was to investigate how a lack of ovarian or/and thyroid hormones affects stem cell number in bone marrow lineage. To examine the effect of thyroid or/and ovarian hormones on the proliferative activity of BMDSCs, we removed the thyroid or/and the ovaries of adult female rats. An absence of ovarian and thyroid hormones was confirmed by Pap staining and Thyroid Stimulating Hormone (TSH) measurement, respectively. To obtain the stem cells from the bone marrow, we punctured the iliac crest, and aspirated and isolated cells by using a density gradient. Specific markers were used by cytometry to identify the different BMDSCs types: endothelial progenitor cells (EPCs), precursor B cells/pro-B cells, and mesenchymal stem cells (MSCs). Interestingly, our results showed that hypothyroidism caused a significant increase in the percentage of EPCs, whereas a lack of ovarian hormones significantly increased the precursor B cells/pro-B cells. Moreover, the removal of both glands led to increased MSCs. In conclusion, both ovarian and thyroid hormones appear to have key and diverse roles in regulating the proliferation of cells populations of the bone marrow.
Assuntos
Células da Medula Óssea/citologia , Estrogênios/sangue , Células-Tronco Mesenquimais/citologia , Hormônios Tireóideos/sangue , Animais , Células da Medula Óssea/fisiologia , Linhagem da Célula , Proliferação de Células , Células Cultivadas , Feminino , Células-Tronco Mesenquimais/fisiologia , Ratos , Ratos WistarRESUMO
Endothelial colony-forming cells (ECFCs) are decreased in the cord blood of preterm infants with moderate-to-severe bronchopulmonary dysplasia. We quantified ECFCs from infants with congenital diaphragmatic hernia, a neonatal disorder with severe lung hypoplasia. Unlike newborns who develop bronchopulmonary dysplasia, those with congenital diaphragmatic hernia had increased and highly-proliferative cord blood ECFCs.
Assuntos
Células Endoteliais , Sangue Fetal/citologia , Hérnias Diafragmáticas Congênitas , Células-Tronco , Proliferação de Células , Células Cultivadas , Células Endoteliais/fisiologia , Feminino , Hérnia Diafragmática/sangue , Humanos , Recém-Nascido , Contagem de Leucócitos , Leucócitos Mononucleares/fisiologia , Masculino , Células-Tronco/fisiologiaRESUMO
OBJECTIVE: We aimed to assess the chemotactic response of endothelial progenitor cells to angiotensin-converting enzyme inhibitors in T2DM patients after acute myocardial infarction, as well as the associated prognosis. METHODS: Sixty-eight T2DM patients with acute myocardial infarction were randomized to either receive or not receive daily oral perindopril 4 mg, and 36 non-diabetic patients with acute myocardial infarction were enrolled as controls. The numbers of circulating CD45−/low+CD34+CD133+KDR+ endothelial progenitor cells, as well as the stromal cell-derived factor-α and high-sensitivity C reactive protein levels, were measured before acute percutaneous coronary intervention and on days 1, 3, 5, 7, 14, and 28 after percutaneous coronary intervention. Patients were followed up for 6 months. Chinese Clinical Trial Registry: ChiCTR-TRC-12002599. RESULTS: T2DM patients had lower circulating endothelial progenitor cell counts, decreased plasma vascular endothelial growth factor and α levels, and higher plasma high-sensitivity C reactive protein levels compared with non-diabetic controls. After receiving perindopril, the number of circulating endothelial progenitor cells increased from day 3 to 7, as did the plasma levels of vascular endothelial growth factor and stromal cell-derived factor-α, compared with the levels in T2DM controls. Plasma high-sensitivity C reactive protein levels in the treated group decreased to the same levels as those in non-diabetic controls. Furthermore, compared with T2DM controls, the perindopril-treated T2DM patients had lower cardiovascular mortality and occurrence of heart failure symptoms (p<0.05) and better left ventricle function (p<0.01). CONCLUSIONS: The use of angiotensin-converting enzyme inhibitors represents a novel approach for improving cardiovascular repair after acute myocardial infarction in T2DM patients. .
Assuntos
Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Inibidores da Enzima Conversora de Angiotensina/uso terapêutico , /complicações , Células Endoteliais/efeitos dos fármacos , Mobilização de Células-Tronco Hematopoéticas , Infarto do Miocárdio/tratamento farmacológico , Perindopril/uso terapêutico , Células-Tronco/efeitos dos fármacos , Proteína C-Reativa/análise , /sangue , /sangue , Células Endoteliais/citologia , Seguimentos , Infarto do Miocárdio/sangue , Infarto do Miocárdio/complicações , Prognóstico , Estudos Prospectivos , Células-Tronco/citologia , Fator A de Crescimento do Endotélio Vascular/sangueRESUMO
OBJECTIVES: The onset of chronic subdural hematoma may be associated with direct or indirect minor injuries to the head or a poorly repaired vascular injury. Endothelial progenitor cells happen to be one of the key factors involved in hemostasis and vascular repair. This study was designed to observe the levels of endothelial progenitor cells, white blood cells, platelets, and other indicators in the peripheral blood of patients diagnosed with chronic subdural hematoma to determine the possible relationship between the endothelial progenitor cells and the occurrence, development, and outcomes of chronic subdural hematoma. METHOD: We enrolled 30 patients with diagnosed chronic subdural hematoma by computer tomography scanning and operating procedure at Tianjin Medical University General Hospital from July 2009 to July 2011. Meanwhile, we collected 30 cases of peripheral blood samples from healthy volunteers over the age of 50. Approximately 2 ml of blood was taken from veins of the elbow to test the peripheral blood routine and coagulation function. The content of endothelial progenitor cells in peripheral blood mononuclear cells was determined by flow cytometry. RESULTS: The level of endothelial progenitor cells in peripheral blood was significantly lower in preoperational patients with chronic subdural hematomas than in controls. There were no significant differences between the two groups regarding the blood routine and coagulation function. However, the levels of circulating endothelial progenitor cells were significantly different between the recurrent group and the non-recurrent group. CONCLUSIONS: The level of circulating endothelial progenitor cells in chronic subdural hematoma patients was significantly lower than the level in healthy controls. Meanwhile, the level of endothelial progenitor cells in recurrent patients was significantly lower than the level in patients without recurrence. Endothelial progenitor cells may ...