title: Nonviral delivery of siRNA into mesenchymal stem cells by a combination of ultrasound and microbubbles.
abstract: Cell therapy is a promising therapeutic strategy for regenerative medicine. However, its current efficacy is insufficient, because of the short lifetime and low engraftment of transplanted cells. Transplantation of genetically modified stem cells has been reported to improve the efficacy of cell therapy. The aim of this study was to elucidate the feasibility of a combination of ultrasound and microbubbles (US-MB) for delivery of small interfering RNA (siRNA) into mesenchymal stem cells (MSC). Although cell damage was observed after US-MB treatment, the transfection efficiency determined using fluorescent-labeled siRNA was significantly increased after US-MB. Furthermore, the intracellular delivery of phosphatase and tensin homolog deleted on chromosome 10 (PTEN) siRNA by US-MB resulted in significant knockdown of PTEN mRNA expression and activation of Akt, a mediator of a survival signaling pathway. Our results indicate that US-MB could serve as a nonviral delivery method of siRNA into MSC. The transplantation of genetically modified MSC by US-MB could be a useful strategy for regenerative medicine in the future.
authors.affiliation: Department of Regenerative Medicine and Tissue Engineering, National Cardiovascular Center Research Institute, Suita, Osaka, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Otani
authors.forename: Kenichi
authors.initials: K
authors.lastname: Yamahara
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Ohnishi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Obata
authors.forename: Soichiro
authors.initials: S
authors.lastname: Kitamura
authors.forename: Noritoshi
authors.initials: N
authors.lastname: Nagaya
mesh_terms: D000273:Adipose Tissue / Q000166:cytology; D000818:Animals; D015153:Blotting, Western; D001854:Bone Marrow Cells / Q000166:cytology; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured; D005290:Ferric Compounds / Q000737:chemistry / Q000494:pharmacology; D015870:Gene Expression; D007328:Insulin / Q000494:pharmacology; D007501:Iron / Q000737:chemistry / Q000494:pharmacology; D008297:Male; D059630:Mesenchymal Stem Cells / Q000187:drug effects / Q000378:metabolism* / Q000528:radiation effects; D045423:Microbubbles; D010087:Oxides / Q000737:chemistry / Q000494:pharmacology; D051059:PTEN Phosphohydrolase / Q000235:genetics / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D034741:RNA, Small Interfering / Q000737:chemistry / Q000235:genetics*; D051381:Rats; D011917:Rats, Inbred Lew; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014162:Transfection; D014465:Ultrasonics
chemical_list: D005290:Ferric Compounds; D007328:Insulin; D010087:Oxides; D034741:RNA, Small Interfering; C069727:Sonazoid; D007501:Iron; D051057:Proto-Oncogene Proteins c-akt; D051059:PTEN Phosphohydrolase; C487216:Pten protein, rat