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Étude du rôle de l'AMPK dans la régulation du potentiel de différenciation des cellules souches en vue de leur utilisation en thérapie cellulaire cardiaque
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Year: 2015 Publisher: Bruxelles: UCL. Faculté de pharmacie et des sciences biomédicales,

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Les cardiomyopathies ischémiques, caractérisées par une mortalité cellulaire importante demeurent une des premières causes de mortalité dans le monde. À l’heure actuelle, aucune option thérapeutique ne permet véritablement la régénération des cardiomyocytes perdus. Or, une telle régénération permettrait de traiter ces pathologies et de prévenir l’insuffisance cardiaque qui y est généralement associée. La thérapie cellulaire s’inscrit dans ce contexte et propose de repeupler la lésion lésée avec de nouvelles cellules, souvent dérivées des cellules souches multi- ou pluripotentes. Les résultats des premiers essais cliniques se sont cependant révélés assez décevants. En effet, plusieurs défis restent à surmonter tels qu’assurer la différenciation de ces cellules souches, améliorer leur survie dans la zone nécrosée à long terme et prévenir une dédifférenciation pouvant amener à la formation de tératome. La protéine kinase dépendante de l’AMP (AMPK), connue pour être un senseur énergétique cardioprotecteur au cours de l’ischémie myocardique mais également impliquée dans des phénomènes cellulaires plus généraux liés à la prolifération et à la différenciation, pourrait apporter une contribution utile à ces trois tableaux. L’objectif de ce travail est d’explorer l’implication de l’AMPK dans la différenciation de cellules souches en cellules différenciées, tels que des cardiomyocytes. Le rôle de l’AMPK est évalué, d’une part, en suivant les modulations de son expression et son activité au cours du processus de différenciation et, d’autre part, en induisant des variations exogènes d’activité, via l’utilisation d’un activateur pharmacologique spécifique, et d’expression, en s’appuyant sur des cellules souches ayant subi une invalidation génétique d’une ou des deux sous-unités catalytiques de la protéine kinase. Cette approche a permis de mettre en évidence, en accord avec et en complément des données de la littérature, une augmentation d’expression et d’activité de la protéine kinase dans deux modèles de différenciation de cellules souches, la différenciation cardiogénique des ESGs murines et la différenciation ostéogénique des MSCs murines. Une activation pharmacologique ne semble pas influencer la différenciation cardiomyogénique tandis qu’elle accélère la différenciation ostéogénique. Une invalidation génétique de(s) sous-unités catalytique(s) de l’AMPK induit un retard important dans les deux modèles de différenciation étudiés. L’AMPK semble jouer un rôle important dans différents processus de différenciation. Les mécanismes à l’œuvre restent à élucider. Ischemic heart diseases remain one of the primary leading causes of mortality and morbidity worldwide. At this point in time, no therapeutic option can address the massive loss ofcardiomyocytes, which drastically need regeneration. Only such regeneration would allow treatment of ischemic heart disease and prevent the associated heart failure. In this context, cellular therapy offers to repopulate the damaged region with new cells, often derived from multi- or pluripotent stem cells. However, the first clinical trials assessing the efficiency of his treatment option turn out to be rather disappointing. Several challenges emerged, such as ensuring the appropriate differentiation of stem cells and improving their long term survival and integration in the damaged area.The AMP-dependent protein kinase (AMPK) is a well-known energy sensor, cardioprotective a context of myocardial ischemia, and also involved in more general phenomena related to cell proliferation and differentiation. This protein could therefore bring useful improvement to cell therapy. The objective of the present work is to explore the involvement of AMPK in the differentiation of stem cells into differentiated cells, such as cardiomyocytes.The role of AMPK is assessed, on the one hand, by monitoring potential modulation of expression or activity of the protein during differentiation and, on the other hand, by inducing exogenous variations of activity, through a pharmacological activator, or of expression, relying on stem cells genetically invalided for one or both of the two catalytic subunits of the protein.This approach allowed us to show, in accordance with and in complement the current literature, an increase in the expression and activity of the protein kinase in 2 models of stem cell differentiation, the cardiogenic differentiation of ESCs and the osteogenic differentiation of MSCs. While a pharmacological activation of the protein did not seem to impact on the cardiogenic differentiation of ESCs, it did accelerate the osteogenic differentiation of MSCs. The genetic knock-down/knock-out of one or the two catalytic subunit of AMPK induced a delay in the differentiation in both models.AMPK seems to be playing an important role of different differentiation process. The mechanisms at play remain to be elucidated.


Book
Adult stem cells : biology and methods of analysis
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ISBN: 161779001X 9786613080677 1617790028 1283080672 Year: 2011 Publisher: New York : Springer,

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This is comprehensive overview of a vital area of scientific enquiry, which covers a broad spectrum of issues. With contributions from some of the key researchers in the field, Adult Stem Cells: Biology and Methods of Analysis offers readers a historical perspective as well as unique insights into cutting-edge thoughts. The volume contextualizes the recent discovery of stem/progenitor cell populations resident in many adult tissues and organs. It confronts the complexities scientists face in trying to validate these cells, while it also describes and critically evaluates the methods currently used to assess stem cell self-renewal. The chapters also seek to distinguish this process from other aspects of cell survival, such as the regulation of life span, senescence, and immortalization at a molecular level. The monograph begins with a section that examine the basic biology of adult stem cells, including chapters on the emerging role of microRNAs in regulating their fate and the molecular mechanisms that govern their self-renewal, the book moves on to analyze the varying methodologies employed in characterizing these elusive elements of our genetic make-up. The second section details in-vivo lineage tracing of tissue-specific stem cells, explores the neural stem cell paradigm, and considers the function of ABC transporters and aldehyde dehydrogenase in adult stem-cell biology. The final section shifts the focus to the life-span regulation and immortalization and features a chapter on the cancer stem cell paradigm. This is an authoritative volume on one of the frontiers of genetic research, and will serve as a valuable resource, not just for established scientists but also for those now entering the field of stem cell biology.


Book
In Search of In Vivo MSC
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Year: 2017 Publisher: Frontiers Media SA

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Book
In Search of In Vivo MSC
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Year: 2017 Publisher: Frontiers Media SA

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Book
Human adult stem cells
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ISBN: 9048184851 9048122686 9786612363559 1282363557 9048122694 Year: 2009 Publisher: Dordrecht ; New York : Springer,

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The aim of volume 7 of Human Cell Culture is to provide clear and precise methods for growing primary cultures of adult stem cells from various human tissues and describe culture conditions in which these adult stem cells differentiate along their respective lineages. The book will be of value to biomedical scientists and of special interest to stem cell biologists and tissue engineers. Each chapter is written by experts actively involved in growing human adult stem cells.


Periodical
Stem Cells and Cloning: Advances and Applications
ISSN: 11786957

Adult stem cells
Authors: ---
ISSN: 00766879 ISBN: 0123736501 9780123736505 9786610751624 1280751622 0080469167 Year: 2006 Volume: 419 Publisher: Totowa, N.J. : Humana Press,

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This is the second of three planned volumes in the Methods in Enzymology series on the topic of stem cells. This volume is a unique anthology of stem cell techniques focusing on adult stem cells, and written by experts from the top laboratories in the world. The contributors not only have hands-on experience in the field but often have developed the original approaches that they share with great attention to detail. The chapters provide a brief review of each field followed by a "cookbook? and handy illustrations. The collection of protocols includes the isolation and maintenance of ste

Human stem cell manual
Authors: --- ---
ISBN: 9780123704658 0123704650 9786611018818 1281018813 0080549888 9780080549880 Year: 2007 Publisher: Amsterdam New York Academic Press

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Stem cells are self-replicating and undifferentiated, meaning their function is not yet cell, tissue, or organ-specific. Due to the unique nature of these cells, research into their biology and function holds great promise for therapeutic applications through replacement or repair of diseased and damaged cells. This reader-friendly manual provides a practical ""hands on"" guide to the culture of human embryonic and somatic stem cells. By presenting methods for embryonic and adult lines side-by-side, the authors lay out an elegant and unique path to understanding the science of stem cell practi


Book
Biobanking and Regenerative Medicine
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Year: 2020 Publisher: Basel, Switzerland : MDPI - Multidisciplinary Digital Publishing Institute,

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Regenerative medicine and tissue engineering play significant roles in the treatment of currently intractable conditions, such as chronic heart failure, stroke, chronic osteoarthritis, and other maladies. Regenerative medicine and tissue engineering generally depend on the utilization of stem cells to treat patients but may also utilize mature cells that would not normally be considered as stem cells (e.g., skin). Stem cells (like mature cells) may be obtained from many sources in the body including bone marrow, cord blood, cord tissue, adipose tissue, etc. Although stem cells are often used in therapy immediately upon isolation, in many circumstances, the stem and progenitor cells will be harvested, processed and banked frozen until a later time. Biobanking is a convenient alternative to same-day therapeutic use, in that it allows for patient recovery (e.g., from liposuction), provides time to identify the best treatment options, and may allow for multiple interventions with additional patient inconvenience or risk.

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