title: A PNIPAAm-based thermosensitive hydrogel containing SWCNTs for stem cell transplantation in myocardial repair.
abstract: Poly (N-isopropylacrylamide) (PNIPAAm) hydrogel was a widely used carrier in therapeutic agent delivery. However, its bioactivities for encapsulated cells were not satisfactory. In the study, we aimed to determine whether modification with single-wall carbon nanotubes (SWCNTs) could improve the bioactivitis, especially supportive adhesion of PNIPAAm to encapsulated cells and favor their efficacy in myocardial repair. A thermosensitive SWCNTs-modified PNIPAAm hydrogel (PNIPAAm/SWCNTs) were prepared by incorporating the SWCNTs into base PNIPAAm hydrogel. The bioactivities of the resulted hydrogel to brown adipose-derived stem cells (BASCs) were evaluated and compared with the base PNIPAAm hydrpgel in vitro. Then, the PNIPAAm-containing hydrogel was used as carrier for imtromyocardial delivery of BASCs in rats with myocardial infarction. The efficacy of PNIPAAm/SWCNTs hydrogel in stem cell-based myocardial repair was systematically evaluated. In vitro study showed that the PNIPAAm/SWCNTs hydrogel demonstrated significantly higher bioactivities to encapsulated BASCs compared with onefold PNIPAAm hydrogel, including promoting cell adhesion and proliferation. When used as carrier for intramyocardial delivery of BASCs after myocardial infarction, the PNIPAAm/SWCNTs hydrogel significantly enhanced the engraftment of seeding cells in infarct myocardium and augmented their therapeutic efficacies in myocardial infarction (MI). The data provided a supportive evidence for the myocardial application of the SWCNTs-modified hydrogel and offered a new perspective in development or improvement of cardiac tissue engineering scaffold.
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China; Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China.
authors.forename: Xia
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Department of Biochemistry and Medical Genetics, Faculty of Medicine, University of Manitoba and Manitoba Institute of Child Health, Winnipeg, Manitoba, Canada.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.affiliation: Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China.
authors.forename: Shuanghong
authors.initials: S
authors.lastname: Lü
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Sun
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China.
authors.forename: Qiuxia
authors.initials: Q
authors.lastname: Lin
authors.affiliation: Department of Polymer Science and Key Laboratory of Systems Bioengineering of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China.
authors.forename: Boguang
authors.initials: B
authors.lastname: Yang
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China.
authors.forename: Cuimi
authors.initials: C
authors.lastname: Duan
authors.affiliation: Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Department of Biochemistry and Medical Genetics, Faculty of Medicine, University of Manitoba and Manitoba Institute of Child Health, Winnipeg, Manitoba, Canada. Electronic address: xing@cc.umanitoba.ca.
authors.forename: Malcolm Mengqiu
authors.initials: MM
authors.lastname: Xing
authors.affiliation: Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences, Beijing, China. Electronic address: wcy2000_te@yahoo.com.
authors.forename: Changyong
authors.initials: C
authors.lastname: Wang
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry; D002448:Cell Adhesion; D002478:Cells, Cultured; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D008297:Male; D009203:Myocardial Infarction / Q000628:therapy*; D009206:Myocardium / Q000166:cytology*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D051381:Rats; D017207:Rats, Sprague-Dawley; D033581:Stem Cell Transplantation / Q000379:methods*; D013696:Temperature; D054457:Tissue Scaffolds / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D037742:Nanotubes, Carbon; C052970:poly-N-isopropylacrylamide; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate
keywords: Cell adhesion; MI; PNIPAAm hydrogel; SWCNTs