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Podoplanin Regulates Mesenchymal Stem Cell Behavior In Flowing Blood And Within The Tissue | 83709
ISSN: 2157-7013

Journal of Cell Science & Therapy
Open Access

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10th World Congress and Expo on Cell & Stem Cell Research

Helen McGettrick
University of Birmingham, UK
ScientificTracks Abstracts: J Cell Sci Ther
DOI: 10.4172/2157-7013-C1-041
Abstract
Mesenchymal stem cells (MSC) are tissue resident stromal cells with immunomodulatory properties which are increasing used therapeutically via injection into the blood. Within the blood and tissue, their adhesive and migration properties, along with their interactions with other blood cells may influence their fate. Human bone marrow (BM) or umbilical cord (UC) MSC adhered from flow to matrix proteins. However, they displayed distinct interactions with platelets when perfused in whole blood, with only UCMSC inducing platelet aggregation and causing a marked drop in platelet count when infused systematically into mice. UCMSC, but not BMMSC, expressed a mucin-like protein called podoplanin, which is known to bind to CLEC-2 expressed on platelets. Expression of podoplanin varied in UCMSC donors; most were positive, but some donors lacked expression (podoplanin negative). Only podoplanin-positive UCMSC were able to aggregate platelets in vitro and in vivo, and this could be blocked by competitive inhibition with recombinant CLEC-2. Human UCMSC caused reduction of platelet count when mixed with mouse blood, but the response was lost with blood taken from mice deficient in CLEC-2. Separately we observed that podoplanin expression enhanced UCMSC migration in vitro in a Rac-1 dependent manner. Thus, the origins of MSC and their expression of podoplanin may have impact on their behavior in blood and tissue. During therapy, MSC interactions with platelets could be thrombotic, but might also promote targeting of MSC to damaged tissue, where they could exert their reparative and immunomodulatory effects.
Biography

Helen McGettrick has completed her PhD in 2006, followed by three Post-doctoral research positions at the University of Birmingham (UK). She was appointed as a University Fellow in Inflammation Biology in 2011, and a year later successfully won a five year Arthritis Research UK Career Development Fellowship. She was recently awarded the prestigious Garrod Prize by the British Society for Rheumatology in 2016. She is currently a Senior Research Fellow at the University of Birmingham and an Honorary Lecturer at the University of Glasgow and Newcastle University (UK). She has ~40 published articles with ≈ 760 citations, has filed three patents and received funding from Wellcome Trust, Medical Research Council UK, Pfizer and British Heart Foundation.
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