The pulmonary microvasculature entraps induced vascular progenitor cells (iVPCs) systemically delivered after cardiac ischemia-reperfusion injury: Indication for preservation of heart function via paracrine effects beyond engraftment.
Melanie Ziegler; Katharina Haigh; Thao Nguyen; Xiaowei Wang; Bock Lim; May Lin Yap; Eleanor M Eddy; Jody J Haigh; Karlheinz Peter
Abstract
Stem cell-based regenerative therapies have been intensively studied with the aim to define an ideal cell type for the treatment of myocardial infarction. We tested systemically delivered, platelet-targeted induced vascular progenitor cells (iVPCs) to study their potential to salvage damaged myocardium after ischemia-reperfusion injury.Using a mouse model of ischemia-reperfusion injury, we tested the potential of platelet-targeted iVPCs (1 × 10 targ-iVPCs) compared to non-targ-iVPCs and a saline control. Bioluminescence imaging, echocardiography, and histological analyses were performed.6Four weeks after ischemia-reperfusion injury, systemic delivery of targ-iVPCs led to reduced fibrosis and infarct size (PBS: 25.7 ± 3.9 vs targ-iVPC: 18.4 ± 6.6 vs non-targ-iVPC: 25.1 ± 3.7%I/LV, P < 0.05), increased neovascularization, and restored cardiac function (PBS: 44.0 ± 4.2 vs targ-iVPC: 54.3 ± 4.5 vs non-targ-iVPC: 46.4 ± 3.8%EF, P < 0.01). Cell tracking experiments revealed entrapment of intravenously injected iVPCs in the pulmonary microvasculature in both cell-treated groups.Systemic delivery of iVPCs after cardiac ischemia-reperfusion injury is limited by pulmonary entrapment of the cells. Nevertheless, targ-iVPCs reduced infarct size, fibrosis, increased neovascularization, and most importantly retained cardiac function. These findings contribute to the mechanistic discussion of cell-based therapy and ultimately identify activated platelet-targeted iVPCs as candidates for cell therapy and also describe cell therapy benefits without the necessity of engrafting.
| Journal | MICROCIRCULATION (NEW YORK, N.Y. : 1994) |
| ISSN | 1549-8719 |
| Published | 01 Feb 2019 |
| Volume | 26 |
| Issue | 2 |
| Pages | e12493 |
| DOI | 10.1111/micc.12493 |
| Type | Journal Article | Research Support, Non-U.S. Gov't |
| Sponsorship | NHMRC: 1185314 |