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HEPATOCYTE GROWTH FACTOR ANGIOGENIC GENE THERAPY IN RAT MYOCARDIAL INFARCT MODEL: MULTIMODAL ASSESSMENT WITH CINE MRI, SPECT/CT, AND TWO-PHOTON EXCITATION FLUORESCENT MICROSCOPY
https://repo.qst.go.jp/records/64025
https://repo.qst.go.jp/records/640257f78d60b-c5e1-46bb-8b1d-61c8743ec5cc
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2010-09-28 | |||||
| タイトル | ||||||
| タイトル | HEPATOCYTE GROWTH FACTOR ANGIOGENIC GENE THERAPY IN RAT MYOCARDIAL INFARCT MODEL: MULTIMODAL ASSESSMENT WITH CINE MRI, SPECT/CT, AND TWO-PHOTON EXCITATION FLUORESCENT MICROSCOPY | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Nan, Jin Yong
× Nan, Jin Yong× Inubushi, Masayuki× Masamoto, Kazuto× Odaka, Kenichi× Aoki, Ichio× Tsuji, Atsushi× Sagara, Masashi× Koizumi, Mitsuru× Saga, Tsuneo× 金 永男× 犬伏 正幸× 正本 和人× 小高 謙一× 青木 伊知男× 辻 厚至× 相良 雅史× 小泉 満× 佐賀 恒夫 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Hepatocyte growth factor (HGF) has been shown to have a potent angiogenic activity in vitro, however, the in vivo therapeutic effects of angiogenic gene therapy using HGF gene in ischemic heart disease remains controversial. The aim of this study was to investigate the effects of HGF gene therapy in rat myocardial infarct model precisely with multimodal imaging including cine MRI, SPECT/CT, and two-photon excitation fluorescent microscopy (TPEFM). \nHuman sodium-iodide symporter (hNIS) gene was used as a radionuclide reporter gene. Recombinant adenoviruses expressing both HGF and hNIS genes comparably driven by dual constitutive cytomegalovirus promoters (Ad-CMV-HGF-CMV-hNIS; Treatment) and hNIS gene only (Ad-CMV-hNIS; Control) were constructed. Wister rats (10 week-old male) received permanent ligation of the left anterior descending artery, followed by injection of Treatment or Control vector into peri-infarct regions of the left ventricular myocardium. On Day 1, cine MRI was performed using a 7.0T MRI (Bruker Biospin BGA-1) to measure end-diastolic volume (EDV) and ejection fraction (EF). On Days 2 and 4, SPECT/CT images of therapeutic gene expression and myocardial perfusion were obtained with 99mTcO4- and 99mTc-tetrofosmin using a small animal SPECT/CT (Gamma Medica-Ideas FX). Nine (5 Treatment and 4 Control) rats showing similar infarct size and similar gene expression levels were followed for 10 weeks to repeat cine MRI and SPECT/CT. Afterwards, excised hearts were processed for immunohistochemistry with alpha-SMA and CD31 to measure small blood vessels and capillary density, and TPEFM to visualize the three-dimensional microvasculature. \nThe repeated cine MRI demonstrated significantly increased EDV in both Treatment and Control rats without significant difference between the groups. The infarct size was similar after follow-up. Capillary density defined by immunohistochemistry was significantly higher in Treatment rats, while small blood vessels were comparable between the groups. TPEFM revealed very thin (≈2µm) irregular vessels increased at peri-infarct regions of Treated hearts. \nTPEFM provided direct evidence that sole HGF gene therapy could induce exclusively immature dysfunctional vessels, which explains other results that increased capillary density didn't lead to cardiac functional recovery. This may contribute to solve the gap between promising results from basic researches and lack in decisive therapeutic effects in clinical researches. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | World Federation of Nuclear Medicine and Biology 2010 | |||||
| 発表年月日 | ||||||
| 日付 | 2010-09-23 | |||||
| 日付タイプ | Issued | |||||
