Abstract
Purpose
Restenosis is a complex and heterogeneous pathophysiological phenomenon occurring in patients submitted to revascularization procedures. Previous studies proved the antirestenotic properties of injected allogenic mesenchymal stromal cells (MSCs) in an experimental model of rat carotid (re)stenosis induced through arteriotomy. In this study we describe some of the effects subsequent to MSC treatment of rats submitted to carotid arteriotomy and possibly responsible for their antirestenotic effect.
Methods
Rat MSCs were isolated from bone marrow, expanded in vitro and characterized. Subsequently, we evaluated the effects of MSC administration via tail vein at 3 and 7 days after carotid arteriotomy both in rat serum and in injured carotids, focusing on DNA oxidative damage (8-oxo-dG detection), cell proliferation index (BrdU incorporation assay), apoptotic index (TUNEL assay), the expression of inflammation- and proliferation-related genes (RT-PCR), the release of growth factors and of inflammation-related cytokines (antibody arrays and ELISA).
Results
MSC administration induced a greater cell proliferation in carotids after arteriotomy, together with an increased level of VEGF in the serum and with the higher expression of VEGF mRNA in injured carotids. Serum analysis also revealed a decreased level of the pro-inflammatory cytokines CXCL1, CXCL5, L-Selectin, ICAM-1 and LIX, and of TIMP1 and SDF-1alpha in MSC-treated rats. The MSC immunomodulatory activity was confirmed by the decreased expression of TLR2 and TLR4 in injured carotids.
Conclusions
MSCs play an immunomodulatory paracrine role when injected in rats submitted to carotid arteriotomy, accompanied by the release of VEGF, possibly contributing to the accelerated repair of the injured vascular wall.
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Acknowledgements
We are grateful to Dr. Karen English for support with ELISA serum analysis, to Dr. Monica Mattia for excellent care of animal welfare and to Ms. M.R. Cipollaro for administrative assistance.
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This work has been partially funded by a SHRO grant to U.G.
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Supplemental Figure 1
Representative cross-sections of carotids from DiI-labeled MSC-treated rats harvested at 3 and 7 days after arteriotomy. A, Uninjured carotid; B, rat carotid harvested at 7 days after arteriotomy and DiI-labeled MSCs-treatement. Representative DiI-labeled MSCs emitting red fluorescence are indicated by white arrows. Nuclei were counterstained with Hoechst 33258, emitting blue fluorescence. 40x magnification. (JPEG 11 kb)
Supplemental Table 1
Summary of RT-PCR primer sequences, position, annealing temperature and PCR product length of the target genes analysed in rat carotids. (DOC 38 kb)
Supplemental Table 2
Summary of data concerning the characterization of bone marrow-derived MSCs expanded in vitro. TOP: RT-PCR analysis of PPAR-g and osteopontin on mRNA samples extracted from undifferentiated MSCs and from MSCs induced to differentiate to adipocytes and osteocytes with different media. Data are expressed as arbitrary densitometric units, mean ± SEM, n = 3 for each group. BOTTOM: FACS analysis of MSCs cultured for 15 days from passage zero. (DOC 36 kb)
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Forte, A., Rinaldi, B., Sodano, L. et al. Stem Cell Therapy for Arterial Restenosis: Potential Parameters Contributing to the Success of Bone Marrow-Derived Mesenchymal Stromal Cells. Cardiovasc Drugs Ther 26, 9–21 (2012). https://doi.org/10.1007/s10557-011-6359-8
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DOI: https://doi.org/10.1007/s10557-011-6359-8