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Pivotal role of paracrine effects in stem cell therapies in regenerative medicine: can we translate stem cell-secreted paracrine factors and microvesicles into better therapeutic strategies?

Leukemia volume 26, pages 1166–1173 (2012)Cite this article

Abstract

Although regenerative medicine is searching for pluripotent stem cells that could be employed for therapy, various types of more differentiated adult stem and progenitor cells are in meantime being employed in clinical trials to regenerate damaged organs (for example, heart, kidney or neural tissues). It is striking that, for a variety of these cells, the currently observed final outcomes of cellular therapies are often similar. This fact and the lack of convincing documentation for donor–recipient chimerism in treated tissues in most of the studies indicates that a mechanism other than transdifferentiation of cells infused systemically into peripheral blood or injected directly into damaged organs may have an important role. In this review, we will discuss the role of (i) growth factors, cytokines, chemokines and bioactive lipids and (ii) microvesicles (MVs) released from cells employed as cellular therapeutics in regenerative medicine. In particular, stem cells are a rich source of these soluble factors and MVs released from their surface may deliver RNA and microRNA into damaged organs. Based on these phenomena, we suggest that paracrine effects make major contributions in most of the currently reported positive results in clinical trials employing adult stem cells. We will also present possibilities for how these paracrine mechanisms could be exploited in regenerative medicine to achieve better therapeutic outcomes. This approach may yield critical improvements in current cell therapies before true pluripotent stem cells isolated in sufficient quantities from adult tissues and successfully expanded ex vivo will be employed in the clinic.

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Acknowledgements

This work was supported by NIH Grant R01 DK074720, the Stella and Henry Endowment, and the European Union structural funds (Innovative Economy Operational Program POIG.01.01.02-00-109/09-00) to MZR.

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Authors and Affiliations

  1. Stem Cell Institute at the James Graham Brown Cancer Center, University of Louisville, Louisville, KY, USA

    M Z Ratajczak, M Kucia & J Ratajczak

  2. Third Division of Cardiology, Medical University of Silesia, Katowice, Poland

    T Jadczyk, W Wojakowski & M Tendera

  3. Cleveland Cord Blood Center, Cleveland, OH, USA

    N J Greco

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Ratajczak, M., Kucia, M., Jadczyk, T. et al. Pivotal role of paracrine effects in stem cell therapies in regenerative medicine: can we translate stem cell-secreted paracrine factors and microvesicles into better therapeutic strategies?. Leukemia 26, 1166–1173 (2012). https://doi.org/10.1038/leu.2011.389

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