Human cardiac stem cell differentiation is regulated by a mircrine mechanism.
نویسندگان
چکیده
BACKGROUND Cardiac stem cells (CSCs) delivered to the infarcted heart generate a large number of small fetal-neonatal cardiomyocytes that fail to acquire the differentiated phenotype. However, the interaction of CSCs with postmitotic myocytes results in the formation of cells with adult characteristics. METHODS AND RESULTS On the basis of results of in vitro and in vivo assays, we report that the commitment of human CSCs (hCSCs) to the myocyte lineage and the generation of mature working cardiomyocytes are influenced by microRNA-499 (miR-499), which is barely detectable in hCSCs but is highly expressed in postmitotic human cardiomyocytes. miR-499 traverses gap junction channels and translocates to structurally coupled hCSCs favoring their differentiation into functionally competent cells. Expression of miR-499 in hCSCs represses the miR-499 target genes Sox6 and Rod1, enhancing cardiomyogenesis in vitro and after infarction in vivo. Although cardiac repair was detected in all cell-treated infarcted hearts, the aggregate volume of the regenerated myocyte mass and myocyte cell volume were greater in animals injected with hCSCs overexpressing miR-499. Treatment with hCSCs resulted in an improvement in ventricular function, consisting of a better preservation of developed pressure and positive and negative dP/dt after infarction. An additional positive effect on cardiac performance occurred with miR-499, pointing to enhanced myocyte differentiation/hypertrophy as the mechanism by which miR-499 potentiated the restoration of myocardial mass and function in the infarcted heart. CONCLUSIONS The recognition that miR-499 promotes the differentiation of hCSCs into mechanically integrated cardiomyocytes has important clinical implications for the treatment of human heart failure.
منابع مشابه
Letter by Sluijter et al regarding article, "Human cardiac stem cell differentiation is regulated by a mircrine mechanism".
متن کامل
The mircrine mechanism controlling cardiac stem cell fate
The recent identification of c-kit-positive cardiac stem cells revealed the great growth reserve of the heart, in which connection among cells might be essential in regulating their fate. Especially, the mircrine mechanism, translocation of microRNAs (miRs) from a cell to another via gap junctions, appeared to be important in controlling the differentiation of cardiac stem cells. The modificati...
متن کاملHeart Failure Human Cardiac Stem Cell Differentiation Is Regulated by a Mircrine Mechanism
Background—Cardiac stem cells (CSCs) delivered to the infarcted heart generate a large number of small fetal-neonatal cardiomyocytes that fail to acquire the differentiated phenotype. However, the interaction of CSCs with postmitotic myocytes results in the formation of cells with adult characteristics. Methods and Results—On the basis of results of in vitro and in vivo assays, we report that t...
متن کاملEvaluation of In Vitro Differentiation of Cardiomyocyte-like cells Derived from Human Bone Marrow Mesenchymal Stem Cells
Purpose: To investigate the in vitro differentiation process of cardiomyocyte-like cells derived from human bone marrow mesenchymal stem cells under the influence of 5-azacytidine (5-aza). Materials and Methods: After purification, human bone marrow mesenchymal stem cells were exposed to 5-aza at a concentration of 5 μmol for 5 weeks to induce cardiomyocyte differentiation. To induce differenti...
متن کاملEvaluation of the Effect of Platelet-Rich Plasma on Proliferation and Differentiation of Human Dental Pulp Stem Cells with or without Ga-Al-As Laser
Background Recently, the clinical use of low power lasers has increased, and it is said that wound healing is accelerated by their irradiation. The aim of this study was evaluation of the effect of platelet-rich plasma on proliferation and differentiation of human dental pulp stem cells with or without Ga-Al-As laser. Methods: In this experimental study, human lower third molar dental pulp c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Circulation
دوره 123 12 شماره
صفحات -
تاریخ انتشار 2011