Ventricular Distribution Pattern of the Novel Sympathetic Nerve PET Radiotracer 18F-LMI1195 in Rabbit Hearts

Rudolf A. Werner, Hiroshi Wakabayashi, Xinyu Chen, Nobuyuki Hayakawa, Constantin Lapa, Steven P. Rowe, Mehrbod S. Javadi, Simon Robinson, Takahiro Higuchi

Research output: Contribution to journalArticle

Abstract

We aimed to determine a detailed regional ventricular distribution pattern of the novel cardiac nerve PET radiotracer 18F-LMI1195 in healthy rabbits. Ex-vivo high resolution autoradiographic imaging was conducted to identify accurate ventricular distribution of 18F-LMI1195. In healthy rabbits, 18F-LMI1195 was administered followed by the reference perfusion marker 201Tl for a dual-radiotracer analysis. After 20 min of 18F-LMI1195 distribution time, the rabbits were euthanized, the hearts were extracted, frozen, and cut into 20-μm short axis slices. Subsequently, the short axis sections were exposed to a phosphor imaging plate to determine 18F-LMI1195 distribution (exposure for 3 h). After complete 18F decay, sections were re-exposed to determine 201Tl distribution (exposure for 7 days). For quantitative analysis, segmental regions of Interest (ROIs) were divided into four left ventricular (LV) and a right ventricular (RV) segment on mid-ventricular short axis sections. Subendocardial, mid-portion, and subepicardial ROIs were placed on the LV lateral wall. 18F-LMI1195 distribution was almost homogeneous throughout the LV wall without any significant differences in all four LV ROIs (anterior, posterior, septal and lateral wall, 99 ± 2, 94 ± 5, 94 ± 4 and 97 ± 3%LV, respectively, n.s.). Subepicardial 201Tl uptake was significantly lower compared to the subendocardial portion (subendocardial, mid-portion, and subepicardial activity: 90 ± 3, 96 ± 2 and *80 ± 5%LV, respectively, *p < 0.01 vs. mid-portion). This was in contradistinction to the transmural wall profile of 18F-LMI1195 (90 ± 4, 96 ± 5 and 84 ± 4%LV, n.s.). A slight but significant discrepant transmural radiotracer distribution pattern of 201Tl in comparison to 18F-LMI1195 may be a reflection of physiological sympathetic innervation and perfusion in rabbit hearts.

Original languageEnglish
Article number17026
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - Dec 1 2019

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Rabbits
Perfusion
N-(3-bromo-4-(3-(18F)fluoro-propoxy)benzyl)guanidine

ASJC Scopus subject areas

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Ventricular Distribution Pattern of the Novel Sympathetic Nerve PET Radiotracer 18F-LMI1195 in Rabbit Hearts. / Werner, Rudolf A.; Wakabayashi, Hiroshi; Chen, Xinyu; Hayakawa, Nobuyuki; Lapa, Constantin; Rowe, Steven P.; Javadi, Mehrbod S.; Robinson, Simon; Higuchi, Takahiro.

In: Scientific reports, Vol. 9, No. 1, 17026, 01.12.2019.

Research output: Contribution to journalArticle

Werner, RA, Wakabayashi, H, Chen, X, Hayakawa, N, Lapa, C, Rowe, SP, Javadi, MS, Robinson, S & Higuchi, T 2019, 'Ventricular Distribution Pattern of the Novel Sympathetic Nerve PET Radiotracer 18F-LMI1195 in Rabbit Hearts', Scientific reports, vol. 9, no. 1, 17026. https://doi.org/10.1038/s41598-019-53596-2
Werner, Rudolf A. ; Wakabayashi, Hiroshi ; Chen, Xinyu ; Hayakawa, Nobuyuki ; Lapa, Constantin ; Rowe, Steven P. ; Javadi, Mehrbod S. ; Robinson, Simon ; Higuchi, Takahiro. / Ventricular Distribution Pattern of the Novel Sympathetic Nerve PET Radiotracer 18F-LMI1195 in Rabbit Hearts. In: Scientific reports. 2019 ; Vol. 9, No. 1.
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abstract = "We aimed to determine a detailed regional ventricular distribution pattern of the novel cardiac nerve PET radiotracer 18F-LMI1195 in healthy rabbits. Ex-vivo high resolution autoradiographic imaging was conducted to identify accurate ventricular distribution of 18F-LMI1195. In healthy rabbits, 18F-LMI1195 was administered followed by the reference perfusion marker 201Tl for a dual-radiotracer analysis. After 20 min of 18F-LMI1195 distribution time, the rabbits were euthanized, the hearts were extracted, frozen, and cut into 20-μm short axis slices. Subsequently, the short axis sections were exposed to a phosphor imaging plate to determine 18F-LMI1195 distribution (exposure for 3 h). After complete 18F decay, sections were re-exposed to determine 201Tl distribution (exposure for 7 days). For quantitative analysis, segmental regions of Interest (ROIs) were divided into four left ventricular (LV) and a right ventricular (RV) segment on mid-ventricular short axis sections. Subendocardial, mid-portion, and subepicardial ROIs were placed on the LV lateral wall. 18F-LMI1195 distribution was almost homogeneous throughout the LV wall without any significant differences in all four LV ROIs (anterior, posterior, septal and lateral wall, 99 ± 2, 94 ± 5, 94 ± 4 and 97 ± 3{\%}LV, respectively, n.s.). Subepicardial 201Tl uptake was significantly lower compared to the subendocardial portion (subendocardial, mid-portion, and subepicardial activity: 90 ± 3, 96 ± 2 and *80 ± 5{\%}LV, respectively, *p < 0.01 vs. mid-portion). This was in contradistinction to the transmural wall profile of 18F-LMI1195 (90 ± 4, 96 ± 5 and 84 ± 4{\%}LV, n.s.). A slight but significant discrepant transmural radiotracer distribution pattern of 201Tl in comparison to 18F-LMI1195 may be a reflection of physiological sympathetic innervation and perfusion in rabbit hearts.",
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AU - Lapa, Constantin

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