title: Tracking cells implanted into cynomolgus monkeys (Macaca fascicularis) using MRI.
abstract: Regenerative therapy with stem cell transplantation is used to treat various diseases such as coronary syndrome and Buerger's disease. For instance, stem-cell transplantation into the infarcted myocardium is an innovative and promising strategy for treating heart failure due to ischemic heart disease. Basic studies using small animals have shown that transplanted cells improve blood flow in the infarcted region. Magnetic resonance imaging (MRI) can noninvasively identify and track transplanted cells labeled with superparamagnetic iron oxide (SPIO). Although clinical regenerative therapies have been clinically applied to patients, the fate of implanted cells remains unknown. In addition, follow-up studies have shown that some adverse events can occur after recovery. Therefore, the present study evaluated the ability of MRI using a 3T scanner to track implanted peripheral blood mononuclear cells labeled with SPIO on days 0 and 7 after intramuscular (i.m.) and intravenous (i.v.) injection into a cynomolgus monkey. Labeled cells were visualized at the liver and triceps surae muscle on MR images using T1- and T2-weighted sequences and histologically localized by Prussian blue staining. The transplanted cells were tracked without abnormal clinical manifestations throughout this study. Hence, MRI of cynomolgus monkey transplanted SPIO-labeled cells is a safe and efficient method of tracking labeled cells that could help to determine the mechanisms involved in regenerative therapy.
authors.affiliation: Tsukuba Primate Research Center, National Institutes of Biomedical Innovation, Health and Nutrition, Hachimandai 1-1, Tsukuba, Ibaraki 305-0843, Japan.
authors.forename: Yasuyo
authors.initials: Y
authors.lastname: Ito-Fujishiro
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Koie
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Shibata
authors.forename: Sachi
authors.initials: S
authors.lastname: Okabayashi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Katakai
authors.forename: Chieko
authors.initials: C
authors.lastname: Ohno
authors.forename: Kiichi
authors.initials: K
authors.lastname: Kanayama
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yasutomi
authors.forename: Naohide
authors.initials: N
authors.lastname: Ageyama
mesh_terms: D000818:Animals; D005290:Ferric Compounds; D007273:Injections, Intramuscular; D007275:Injections, Intravenous; D008099:Liver / Q000166:cytology; D008252:Macaca fascicularis; D018810:Magnetic Resonance Angiography / Q000295:instrumentation / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods; D008297:Male; D018482:Muscle, Skeletal / Q000166:cytology; D036102:Peripheral Blood Stem Cell Transplantation; D044968:Regenerative Medicine
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide