Figure 5c depicts phantom images obtained for the DPNs using a 3T MRI clinical scanner. All three nanoconstructs incorporate ultrasmall SPIOs with a 5 nm metallic core that is, eventually, degraded and metabolized by the cells without any significant toxicity. Figure 5 (A) Graphical configuration of a cluster of stem cells inject. (A) Graphical representation

of a 5-nm superparamagnetic iron oxide nanoparticle Inhibitors,research,lifescience,medical (SPIO); a 150-nm hybrid nanoparticle (HNP); discoidal 1,000 x 400 nm mesoporous silicon particle (SiMP); and … Note that in stem cell labeling, it is very important to have access to different nanotechnological platforms in that the nanoconstructs per se can affect the cell behavior.48 Importantly, these nanoconstructs can be remotely manipulated Inhibitors,research,lifescience,medical via static magnetic fields because of their

huge content in magnetic material (about 100 fg of iron per DPN) and can release directly inside the stem cell molecular agents for stimulating and controlling cell differentiation. Moreover, these nanoconstructs can be labeled with radionucleotides, thus merging together MRI and nuclear imaging, which could help in assessing cell functionality and viability in addition to cell tracking.49 Conclusions The efficiency of stem cell homing within the infarcted tissue can be predicted using patient-specific computational modeling as a function of Inhibitors,research,lifescience,medical the vascular geometry, blood flow conditions, and location of the infarcted area. Multifunctional magnetic nanoconstructs can serve to spatially and temporally track Inhibitors,research,lifescience,medical the injected stem cells and test for their viability. The combination

of computational modeling and sophisticated nanoconstructs for cell labeling should pave the way to new clinical trials for cell-based therapies in cardiovascular disease. Acknowledgements The author would like to thank Dr. T.R. Lee, Dr. J. Singh, Dr. S. Hossain, Inhibitors,research,lifescience,medical and Mr. M. Landry at Houston ARRY-162 Methodist Hospital Research Institute for helping with the figures and data generation. The author acknowledges the collaboration with Dr. T.J.R. Hughes at The University of Texas, Austin, and with Dr. W.K. Liu at Northwestern University for the development of the computational module 1 and 2, respectively. The patient-specific data on PAD were kindly provided by Dr. D. Shah at the Houston Methodist DeBakey Heart Sodium butyrate & Vascular Center and Dr. G. Bruner at Baylor College of Medicine. Funding Statement Funding/Support: The author has no funding disclosures. Footnotes Conflict of Interest Disclosure: The author has completed and submitted the Methodist DeBakey Cardiovascular Journal Conflict of Interest Statement and none were reported.
Introduction There is an increasing demand in regenerative medicine to repair and restore the function of injured, degenerated, or congenitally defected tissues. In a wide range of pathology, neither native nor purely artificial implantable materials can adequately replace or repair these damaged tissues.