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Wakabayashi H, Mori H, Hiromasa T, Akatani N, Inaki A, Kozaka T, Kitamura Y, Ogawa K, Kinuya S, Taki J. 125I-labeled 2-[4-(2-iodophenyl)piperidino]cyclopentanol ( 125I-OI5V) imaging visualized augmented sigma-1 receptor expression according to the severity of myocardial ischemia. J Nucl Cardiol 2023; 30:653-661. [PMID: 35915325 DOI: 10.1007/s12350-022-03064-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 06/22/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND We aimed to explore how the severity of myocardial ischemia affects myocardial sigma-1 receptor (Sig-1R) expression using 125I-labeled 2-[4-(2-iodophenyl)piperidino]cyclopentanol (125I-OI5V) imaging. METHODS AND RESULTS The left coronary artery was occluded for 30, 20, and 10 minute, to vary the severity of myocardial ischemia, followed by reperfusion. Dual-tracer autoradiography of the left ventricular short-axis slices was performed 3 and 7 days after reperfusion. 125I-OI5V was injected 30 minute before sacrifice and the area at risk (AAR) was evaluated by 99mTc-MIBI. Intense 125I-OI5V uptake was observed in the AAR and was significantly increased with increasing ischemia duration. To evaluate salvaged and nonsalvaged areas (preserved and decreased perfusion areas), triple-tracer autoradiography was performed 3 days after reperfusion. After dual-tracer autoradiography, 201Tl was injected 20 minute post 125I-OI5V injection. On triple-tracer autoradiography, the AAR/normally perfused area 125I-OI5V uptake ratio was positively correlated with the nonsalvaged area/whole left ventricular (LV) area ratio (P < .05). The AAR/normally perfused area 125I-OI5V uptake ratio was negatively correlated with the 201Tl uptake ratio of the AAR to normally perfused areas (P < .05). The comparison of the immunostaining distribution of 125I-OI5V and the macrophage marker CD68 revealed that 125I-OI5V was present mainly in, and immediately adjacent to the macrophage infiltration area. CONCLUSIONS Significant 125I-OI5V uptake in the AAR depends on the duration of ischemia and reduced 201Tl uptake; furthermore, 125I-OI5V was found in and around the macrophage infiltrate area. These results indicate that iodine-labeled OI5V is a promising tool for visualizing Sig-1R expression according to the ischemic burden.
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Affiliation(s)
- Hiroshi Wakabayashi
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan.
| | - Hiroshi Mori
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Tomo Hiromasa
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Norihito Akatani
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Anri Inaki
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Takashi Kozaka
- Division of Probe Chemistry for Disease Analysis, Research Center for Experimental Modeling of Human Disease, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Yoji Kitamura
- Division of Probe Chemistry for Disease Analysis, Research Center for Experimental Modeling of Human Disease, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Kazuma Ogawa
- Institute for Frontier Science Initiative, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Seigo Kinuya
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Junichi Taki
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
- Kanazawa Advanced Medical Center, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-0934, Japan
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Wakabayashi H, Taki J, Inaki A, Hiromasa T, Okuda K, Shibutani T, Shiba K, Kinuya S. Quantification of Myocardial Perfusion Defect Size in Rats: Comparison between Quantitative Perfusion SPECT and Autoradiography. Mol Imaging Biol 2018; 20:544-550. [PMID: 29340889 DOI: 10.1007/s11307-018-1159-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 01/02/2018] [Indexed: 12/20/2022]
Abstract
PURPOSE Ultra-high resolution single-photon emission computed tomography (SPECT) system, using multiple pinhole collimators, has been applied to the imaging of small rodents. We aimed to compare the myocardial infarction (MI) area on quantitative perfusion single-photon emission computed tomography (QPS; Cedars-Sinai Medical Center, USA) with that on high-resolution autoradiography in rat model to determine the accuracy of perfusion defect measurement by QPS. PROCEDURES After thoracotomy, rats (n = 9) had their left coronary arteries occluded and reperfused before injection with 185 MBq [99mTc] methoxyisobutylisonitrile ([99mTc]MIBI) for SPECT and autoradiography. Healthy rats (n = 28) were similarly scanned to create a normal database on which to base QPS. The MI area on SPECT images was analysed automatically by QPS software. For the autoradiography images, regions of interest for MI were set at 1 mm intervals. RESULTS In normal rats, [99mTc]MIBI accumulated throughout the left ventricles, and a polar map of ventricular perfusion showed the lowest and highest uptakes in the inferior (68 % ± 4 %) and anterior (92 % ± 5 %) walls, respectively. In the rat MI model, the percentage of polar map with reduced [99mTc]MIBI uptake correlated strongly with the percentage of left ventricle with MI on autoradiography (r2 = 0.90). CONCLUSIONS QPS can quantitatively evaluate MI severity on myocardial perfusion images in rats, with comparable results to autoradiography. This widely available software could promote the development of new techniques for analysing cardiac images in small animals.
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Affiliation(s)
- Hiroshi Wakabayashi
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan.
| | - Junichi Taki
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Anri Inaki
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Tomo Hiromasa
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Koichi Okuda
- Department of Physics, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Kahoku, Ishikawa, 920-0293, Japan
| | - Takayuki Shibutani
- Department of Quantum Medical Technology, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, 920-0942, Japan
| | - Kazuhiro Shiba
- Division of Tracer Kinetics, Advanced Science Research Center, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Seigo Kinuya
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
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Wakabayashi H, Taki J, Inaki A, Shiba K, Matsunari I, Kinuya S. Correlation between apoptosis and left ventricular remodeling in subacute phase of myocardial ischemia and reperfusion. EJNMMI Res 2015; 5:72. [PMID: 26660543 PMCID: PMC4674630 DOI: 10.1186/s13550-015-0152-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 12/01/2015] [Indexed: 11/22/2022] Open
Abstract
Background To investigate whether an apoptotic process demonstrated by 99mTc-annexin-V (99mTc-AV) uptake correlates with left ventricular remodeling (LVR) after myocardial infarction, we assessed 99mTc-AV uptake in rat model of myocardial ischemia and reperfusion. Methods The left coronary artery (LCA) of 15 rats was occluded for 20 to 30 min, followed by reperfusion. After 2 weeks, 99mTc-AV was injected, and then 1 h later, 201Tl was injected after reocclusion of the LCA. Dual-tracer autoradiography was performed to assess 99mTc-AV uptake and the area at risk (AAR) by 201Tl defect. 99mTc-AV uptake ratio was calculated by dividing the count density of the AAR by that of the normally perfused area. In short-axis LV slices, LV cavity dilation index (DI) was calculated by dividing the area of LV cavity by that of the whole LV area. LV wall-thinning ratio (WTR) was calculated by dividing the LV wall thickness in the AAR by that of the normally perfused area. Results Significant 99mTc-AV uptake in the AAR was observed in 10 rats. DI was significantly higher in rats with positive 99mTc-AV uptake than in rats without uptake. WTR was smaller in rats with positive 99mTc-AV uptake than in rats without uptake. Conclusions The data suggest 99mTc-AV uptake in injured myocardium might correlate with LVR at 2 weeks after myocardial ischemia and reperfusion.
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Affiliation(s)
- Hiroshi Wakabayashi
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan.
| | - Junichi Taki
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Anri Inaki
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
| | - Kazuhiro Shiba
- Division of Tracer Kinetics, Advanced Science Research Centre, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8640, Japan
| | - Ichiro Matsunari
- The Medical and Pharmacological Research Centre Foundation, Wo 32, Inoyama, Hakui, 925-0613, Japan
| | - Seigo Kinuya
- Department of Nuclear Medicine, Kanazawa University Hospital, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8641, Japan
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Jackson R, Tilokee EL, Latham N, Mount S, Rafatian G, Strydhorst J, Ye B, Boodhwani M, Chan V, Ruel M, Ruddy TD, Suuronen EJ, Stewart DJ, Davis DR. Paracrine Engineering of Human Cardiac Stem Cells With Insulin-Like Growth Factor 1 Enhances Myocardial Repair. J Am Heart Assoc 2015; 4:e002104. [PMID: 26363004 PMCID: PMC4599498 DOI: 10.1161/jaha.115.002104] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Insulin-like growth factor 1 (IGF-1) activates prosurvival pathways and improves postischemic cardiac function, but this key cytokine is not robustly expressed by cultured human cardiac stem cells. We explored the influence of an enhanced IGF-1 paracrine signature on explant-derived cardiac stem cell-mediated cardiac repair. METHODS AND RESULTS Receptor profiling demonstrated that IGF-1 receptor expression was increased in the infarct border zones of experimentally infarcted mice by 1 week after myocardial infarction. Human explant-derived cells underwent somatic gene transfer to overexpress human IGF-1 or the green fluorescent protein reporter alone. After culture in hypoxic reduced-serum media, overexpression of IGF-1 enhanced proliferation and expression of prosurvival transcripts and prosurvival proteins and decreased expression of apoptotic markers in both explant-derived cells and cocultured neonatal rat ventricular cardiomyocytes. Transplant of explant-derived cells genetically engineered to overexpress IGF-1 into immunodeficient mice 1 week after infarction boosted IGF-1 content within infarcted tissue and long-term engraftment of transplanted cells while reducing apoptosis and long-term myocardial scarring. CONCLUSIONS Paracrine engineering of explant-derived cells to overexpress IGF-1 provided a targeted means of improving cardiac stem cell-mediated repair by enhancing the long-term survival of transplanted cells and surrounding myocardium.
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Affiliation(s)
| | | | | | - Seth Mount
- University of Ottawa Heart InstituteOttawa, Canada
| | | | | | - Bin Ye
- University of Ottawa Heart InstituteOttawa, Canada
| | | | - Vincent Chan
- University of Ottawa Heart InstituteOttawa, Canada
| | - Marc Ruel
- University of Ottawa Heart InstituteOttawa, Canada
| | | | | | | | - Darryl R Davis
- University of Ottawa Heart InstituteOttawa, Canada
- Correspondence to: Darryl R. Davis, MD, University of Ottawa Heart Institute, H3214 40 Ruskin Ave, Ottawa, Ontario, Canada K1Y4W7. E-mail:
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Poulsen RH, Rasmussen JT, Bøtker HE, Waehrens LS, Falborg L, Heegaard CW, Rehling M. Imaging the myocardium at risk with ⁹⁹mTc-lactadherin administered after reperfusion in a porcine model. Nucl Med Biol 2013; 41:114-9. [PMID: 24267057 DOI: 10.1016/j.nucmedbio.2013.09.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 09/23/2013] [Accepted: 09/28/2013] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Phosphatidylserine is translocated from the inner to the outer leaflet of the plasma membrane in the early stages of apoptosis and necrosis and in reversibly injured cells. In rabbit hearts, ischemia followed by reperfusion results in exposure of phosphatidylserine on myocytes unaffected by apoptosis or necrosis. Lactadherin was recently introduced as a highly sensitive phosphatidylserine ligand. We hypothesized that ischemic myocardial cell damage can be identified by radio-labeled lactadherin and that the ischemic area at risk (AAR) can be visualized retrospectively after reperfusion. METHODS Left anterior descending coronary artery in pigs was occluded for 20 minutes, 45 minutes or 45 minutes preceded by ischemic preconditioning. In all three groups, (99m)Tc-lactadherin was injected intravenously 30 minutes after reperfusion. The AAR was demarcated by Evans blue and the infarct size by 2,3,5,-triphenyltetrazodium chloride staining. RESULTS The regional myocardial uptake of (99m)Tc-lactadherin closely correlated with the AAR (r=.83, P = .001). The area of (99m)Tc-lactadherin uptake was unaltered by a shorter duration of ischemia and ischemic preconditioning (P=.23) despite significantly different infarct development (P=.001). CONCLUSION The results suggest that (99m)Tc-lactadherin can be used as a sensitive marker for AAR imaging when injected 30 minutes after reperfusion following acute ischemia.
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Affiliation(s)
- Runa H Poulsen
- Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark.
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Affiliation(s)
- Frank M Bengel
- Department of Nuclear Medicine, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.
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Taki J, Matsunari I, Wakabayashi H, Inaki A, Kinuya S. Potential use of 99mTc-annexin V imaging in ischemically damaged myocardium. Interv Cardiol 2010. [DOI: 10.2217/ica.10.86] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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