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Le Kremlin-Bicêtre, France

Abdelalim E.M.,Qatar Biomedical Research Institute | Abdelalim E.M.,Suez Canal University | Bonnefond A.,Qatar Biomedical Research Institute | Bonnefond A.,French National Center for Scientific Research | And 9 more authors.
Stem Cell Reviews and Reports

Diabetes mellitus is the most prevailing disease with progressive incidence worldwide. To date, the pathogenesis of diabetes is far to be understood, and there is no permanent treatment available for diabetes. One of the promising approaches to understand and cure diabetes is to use pluripotent stem cells (PSCs), including embryonic stem cells (ESCs) and induced PCSs (iPSCs). ESCs and iPSCs have a great potential to differentiate into all cell types, and they have a high ability to differentiate into insulin-secreting β cells. Obtaining PSCs genetically identical to the patient presenting with diabetes has been a longstanding dream for the in vitro modeling of disease and ultimately cell therapy. For several years, somatic cell nuclear transfer (SCNT) was the method of choice to generate patient-specific ESC lines. However, this technology faces ethical and practical concerns. Interestingly, the recently established iPSC technology overcomes the major problems of other stem cell types including the lack of ethical concern and no risk of immune rejection. Several iPSC lines have been recently generated from patients with different types of diabetes, and most of these cell lines are able to differentiate into insulin-secreting β cells. In this review, we summarize recent advances in the differentiation of pancreatic β cells from PSCs, and describe the challenges for their clinical use in diabetes cell therapy. Furthermore, we discuss the potential use of patient-specific PSCs as an in vitro model, providing new insights into the pathophysiology of diabetes. © 2014 Springer Science+Business Media New York. Source

Sandt C.,Synchrotron Soleil | Feraud O.,University Paris - Sud | Oudrhiri N.,University Paris - Sud | Oudrhiri N.,AP HP Laboratory of Hematology | And 15 more authors.

Recent technological advances in cell reprogramming by generation of induced pluripotent stem cells (iPSC) offer major perspectives in disease modelling and future hopes for providing novel stem cells sources in regenerative medicine. However, research on iPSC still requires refining the criteria of the pluripotency stage of these cells and exploration of their equivalent functionality to human embryonic stem cells (ESC). We report here on the use of infrared microspectroscopy to follow the spectral modification of somatic cells during the reprogramming process. We show that induced pluripotent stem cells (iPSC) adopt a chemical composition leading to a spectral signature indistinguishable from that of embryonic stem cells (ESC) and entirely different from that of the original somatic cells. Similarly, this technique allows a distinction to be made between partially and fully reprogrammed cells. We conclude that infrared microspectroscopy signature is a novel methodology to evaluate induced pluripotency and can be added to the tests currently used for this purpose. © 2012 Sandt et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Source

Merle N.,French Institute of Health and Medical Research | Merle N.,French Atomic Energy Commission | Merle N.,Joseph Fourier University | Feraud O.,University Paris - Sud | And 19 more authors.

Here we report on the identification of a human pluripotent embryonic stem cell (hESC) specific mitochondrial protein that is re-expressed in cancer cells, ATAD3B. ATAD3B belongs to the AAA+ ATPase ATAD3 protein family of mitochondrial proteins specific to multicellular eukaryotes. Using loss- and gain-of-function approaches, we show that ATAD3B associates with the ubiquitous ATAD3A species, negatively regulates the interaction of ATAD3A with matrix nucleoid complexes and contributes to a mitochondria fragmentation phenotype. We conclude that ATAD3B is a negative regulator of ATAD3A and may function as an adaptor of mitochondrial homeostasis and metabolism in hESCs and cancer cells. © 2012 Elsevier B.V. and Mitochondria Research Society. Source

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