15 research outputs found
Etudes des potentiels cardiogéniques et angiogéniques in vivo des cellules dérivées des tissus adipeux
TOULOUSE3-BU Sciences (315552104) / SudocSudocFranceF
Les cellules souches mésenchymateuses
Les cellules souches/stromales mĂ©senchymateuses sont une population cellulaire capable dâagir sur la rĂ©paration et la rĂ©gĂ©nĂ©ration tissulaires par diffĂ©rents mĂ©canismes allant du remplacement cellulaire Ă la modulation des rĂ©ponses immunitaires et inflammatoires. Du fait de leurs diffĂ©rentes potentialitĂ©s, les CSM ont Ă©tĂ© utilisĂ©es dĂšs 1995 dâabord dans un contexte hĂ©matologique pour aider au soutien de lâhĂ©matopoĂŻĂšse, puis pour traiter la rĂ©action du greffon contre lâhĂŽte. Leur potentiel de diffĂ©renciation explique Ă©galement leur utilisation dans un but de rĂ©paration osseuse. Depuis plus de 15 ans les champs dâapplication potentiels Ă©tudiĂ©s dans des essais cliniques se sont Ă©tendus Ă des indications aussi variĂ©es que les lĂ©sions cutanĂ©es au cours des brĂ»lures ou les accidents vasculaires cĂ©rĂ©braux. Le but des textes regroupĂ©s dans cet article nâest pas de donner une vision exhaustive de lâensemble des indications potentielles en cours dâĂ©valuation, mais de montrer ce que peuvent ĂȘtre des applications combinant les diffĂ©rents moyens dâaction des CSM dans quatre domaines particuliers : les pathologies dysimmunitaires, la rĂ©paration osseuse, la rĂ©gĂ©nĂ©ration vasculaire et lâophtalmologie
Adipose-derived stromal cells: Their identity and uses in clinical trials, an update
In adults, adipose tissue is abundant and can be easily sampled using liposuction. Largely involved in obesity and associated metabolic disorders, it is now described as a reservoir of immature stromal cells. These cells, called adipose-derived stromal cells (ADSCs) must be distinguished from the crude stromal vascular fraction (SVF) obtained after digestion of adipose tissue. ADSCs share many features with mesenchymal stem cells derived from bone marrow, including paracrine activity, but they also display some specific features, including a greater angiogenic potential. Their angiogenic properties as well as their paracrine activity suggest a putative tumor-promoting role for ADSCs although contradictory data have been published on this issue. Both SVF cells and ADSCs are currently being investigated in clinical trials in several fields (chronic inflammation, ischemic diseases, etc.). Apart from a phase III trial on the treatment of fistula, most of these are in phaseâ
Iâ
and use autologous cells. In the near future, the end results of these trials should provide a great deal of data on the safety of ADSC use
Polymer-Based Reconstruction of the Inferior Vena Cava in Rat: Stem Cells or RGD Peptide?
Adipose-derived cardiomyogenic cells: in vitro expansion and functional improvement in a mouse model of myocardial infarction
1755-3245 (Electronic) Journal Article Research Support, Non-U.S. Gov'tAIMS: Cells derived from the stroma vascular fraction (SVF) of mouse adipose tissue can spontaneously give rise to rare, functional, cardiac-like cells in vitro. This study aimed to improve the production of adipose-derived cardiomyogenic cells (AD-CMG), to characterize them and to assess their cardiac fate and functional outcomes after their administration in a mouse model of acute myocardial infarction. METHODS AND RESULTS: The culture process optimized to improve in vitro cardiac specification consisted of a primary culture of murine SVF cells in semi-solid methylcellulose medium, a selection of AD-CMG cell clusters, and a secondary culture and expansion in BHK21 medium. AD-CMG cells were CD29(+), CD31(-), CD34(-), CD44(+), CD45(-), CD81(+), CD90(-), CD117(-), and Flk-1(-) and expressed several cardiac contractile proteins. After 1, 2, and 4 weeks of their injection in mice having acute myocardial infarction, a strong presence of green fluorescent protein-positive cells was identified by immunohistochemistry as well as quantitative polymerase chain reaction. Echocardiography showed a significant reduction of remodelling and stability of left ventricle ejection fraction in the AD-CMG cell-treated group vs. controls. Vascular density analysis revealed that AD-CMG administration was also associated with stimulation of angiogenesis in peri-infarct areas. CONCLUSION: Cardiomyogenic cells can be selected and expanded in large amounts from mouse adipose tissue. They can survive and differentiate in an acute myocardial infarction model, avoiding remodelling and impairment of cardiac function, and can promote neo-vascularization in the ischaemic heart
Preconditioning by mitochondrial reactive oxygen species improves the proangiogenic potential of adipose-derived cells-based therapy
1524-4636 (Electronic) Journal Article Research Support, Non-U.S. Gov'tOBJECTIVE: Transplantation of adipose-derived stroma cells (ADSCs) stimulates neovascularization after experimental ischemic injury. ADSC proangiogenic potential is likely mediated by their ability to differentiate into endothelial cells and produce a wide array of angiogenic and antiapoptotic factors. Mitochondrial reactive oxygen species (ROS) have been shown to control ADSC differentiation. We therefore hypothesized that mitochondrial ROS production may change the ADSC proangiogenic properties. METHODS AND RESULTS: The use of pharmacological strategies (mitochondrial inhibitors, antimycin, and rotenone, with or without antioxidants) allowed us to specifically and precisely modulate mitochondrial ROS generation in ADSCs. We showed that transient stimulation of mitochondrial ROS generation in ADSCs before their injection in ischemic hindlimb strongly improved revascularization and the number of ADSC-derived CD31-positive cells in ischemic area. Mitochondrial ROS generation increased the secretion of the proangiogenic and antiapoptotic factors, VEGF and HGF, but did not affect ADSC ability to differentiate into endothelial cells, in vitro. Moreover, mitochondrial ROS-induced ADSC preconditioning greatly protect ADSCs against oxidative stress-induced cell death. CONCLUSIONS: Our study demonstrates that in vitro preconditioning by moderate mitochondrial ROS generation strongly increases in vivo ADSC proangiogenic properties and emphasizes the crucial role of mitochondrial ROS in ADSC fate
Adipose-derived cardiomyogenic cells: in vitro expansion and functional improvement in a mouse model of myocardial infarction
Adipose-derived cardiomyogenic cells: in vitro expansion and functional improvement in a mouse model of myocardial infarction
Aims Cells derived from the stroma vascular fraction (SVF) of mouse adipose tissue can spontaneously give rise to rare, functional, cardiac-like cells in vitro. This study aimed to improve the production of adipose-derived cardiomyogenic cells (AD-CMG), to characterize them and to assess their cardiac fate and functional outcomes after their administration in a mouse model of acute myocardial infarction.
Methods and results The culture process optimized to improve in vitro cardiac specification consisted of a primary culture of murine SVF cells in semi-solid methylcellulose medium, a selection of AD-CMG cell clusters, and a secondary culture and expansion in BHK21 medium. AD-CMG cells were CD29+, CD31â, CD34â, CD44+, CD45â, CD81+, CD90â, CD117â, and Flk-1â and expressed several cardiac contractile proteins. After 1, 2, and 4 weeks of their injection in mice having acute myocardial infarction, a strong presence of green fluorescent protein-positive cells was identified by immunohistochemistry as well as quantitative polymerase chain reaction. Echocardiography showed a significant reduction of remodelling and stability of left ventricle ejection fraction in the AD-CMG cell-treated group vs. controls. Vascular density analysis revealed that AD-CMG administration was also associated with stimulation of angiogenesis in peri-infarct areas.
Conclusion Cardiomyogenic cells can be selected and expanded in large amounts from mouse adipose tissue. They can survive and differentiate in an acute myocardial infarction model, avoiding remodelling and impairment of cardiac function, and can promote neo-vascularization in the ischaemic heart