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A synthetic tryptophan metabolite reduces hemorrhagic area and inflammation after pulmonary radiofrequency ablation in rabbit nonneoplastic lungs

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Abstract

Purpose

The purpose of this study was to determine the effect of a synthetic tryptophan metabolite, tranilast [N-(3,4-dimethoxycinnamoyl)-anthranilic acid], on inflammatory and hemorrhagic areas after pulmonary radiofrequency ablation (RFA) in rabbits.

Materials and methods

Percutaneous RFA using a 17-gauge LeVeen electrode was performed in normal rabbit lungs. The rabbits were divided into tranilast-treated (300 mg/kg/day, orally) and control groups (n = 24/group). The effects of tranilast were evaluated using multidetector-row computed tomography (CT), histology, and immunohistochemistry immediately after RFA on days 1, 7, 14, and 28.

Results

Oral administration of tranilast significantly reduced the size of ablated lesions assessed using CT and histology on days 7 and 14. Furthermore, it reduced the hemorrhagic areas on day 7 and inflammatory areas on day 14, but did not affect the areas of coagulation necrosis on days 1, 7, 14, and 28. Immunohistochemical analysis showed an increase in the ratio of CD163-positive macrophage areas to rabbit macrophage (RAM11)-positive pan-macrophage areas and a decrease in the number of nuclear factor-κB-positive nuclei and CD31-positive microvessels in the tranilast group on days 7 and/or 14.

Conclusions

The results suggest that tranilast modulates the repair process after pulmonary RFA through macrophage accumulation, suppression of inflammation, and angiogenesis.

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Acknowledgments

This research was supported in part by a Grants-in-Aid for Scientific Research in Japan (Nos. 19790885 H.N., 23790410, 25460440 A.Y., 23390084 Y.A.). We are most grateful to Ms. Kyoko Ohashi, Ms. Ritsuko Sotomura, Ms. Yukiko Motoura, Ms. Tomoko Kawanami, Ms. Takako Sakamoto and Mr. Minoru Shiraishi for their technical assistance.

Conflict of interest

None.

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Authors and Affiliations

  1. Department of Radiology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, 889-1692, Japan

    Hiroshi Nakada, Eiji Furukoji, Noriko Uchino & Shozo Tamura

  2. Department of Pathology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki, 889-1692, Japan

    Atsushi Yamashita & Yujiro Asada

  3. Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1, Gakuen Kibanadai-nishi, Miyazaki-shi, Miyazaki, 889-2192, Japan

    Taketoshi Asanuma

  4. Department of Radiology, Fujimoto Central Hospital, 3584-1, Ranbashi, kitakawauchi, Miyazaki, Miyazaki, 880-0941, Japan

    Masaomi Kuroki

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  1. Hiroshi Nakada
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Correspondence to Hiroshi Nakada.

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Nakada, H., Yamashita, A., Kuroki, M. et al. A synthetic tryptophan metabolite reduces hemorrhagic area and inflammation after pulmonary radiofrequency ablation in rabbit nonneoplastic lungs. Jpn J Radiol 32, 145–154 (2014). https://doi.org/10.1007/s11604-014-0282-4

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  • DOI: https://doi.org/10.1007/s11604-014-0282-4

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