Journal of Cardiovascular Imaging

Korean Society of Echocardiography (한국심초음파학회)
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TARGETED ULTRASOUND IMAGING OF APOPTOSIS WITH ANNEXIN A5 MICROBUBBLES IN ACUTE DOXORUBICIN-INDUCED CARDIOTOXICITY

  • Min, Pil-Ki (Division of Cardiology, Heart Center, Gangnam Severance Hospital, Yonsei University College of Medicine) ;
  • Lim, So-Yeon (Yonsei Cardiovascular Center and Research Institute, Yonsei University College of Medicine) ;
  • Kang, Soo-Jung (Biobud Co. Ltd.) ;
  • Hong, Sung-Yu (Biobud Co. Ltd.) ;
  • Hwang, Ki-Chul (Yonsei Cardiovascular Center and Research Institute, Yonsei University College of Medicine) ;
  • Chung, Kwang-Hoe (Department of Biochemistry, CHA University College of Medicine) ;
  • Shim, Chi-Young (Yonsei Cardiovascular Center and Research Institute, Yonsei University College of Medicine) ;
  • Rim, Se-Joong (Division of Cardiology, Heart Center, Gangnam Severance Hospital, Yonsei University College of Medicine) ;
  • Chung, Nam-Sik (Yonsei Cardiovascular Center and Research Institute, Yonsei University College of Medicine)
  • Published : 2010.09.27
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Abstract

Background: The aim of this study was to assess the feasibility of targeted ultrasound imaging on apoptosis with annexin A5 microbubbles (A5MB) in acute doxorubicin-induced cardiotoxicity. Methods: Avidinated and octafluoropropan-filled phospholipid microbubbles were conjugated with biotinylated annexin A5. To confirm the specific binding of A5MB, flow cytometry was performed with hydrogen peroxide induced apoptosis in rat aorta smooth muscle cells incubated with fluorescein-5-isothiocyanate (FITC) labeled annexin A5 and A5MB. Adult male rats were injected intraperitoneally with 5 mg/kg doxorubicin weekly for 3 weeks (n = 5). Control rats were injected with normal saline (n = 5). At 24 hours after the final treatment, triggering imaging was performed 15 min after an intravenous bolus injection of A5MB for washout of freely circulating microbubbles. After echocardiography, the heart was isolated for histological detection of apoptosis by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay. Results: In the in vitro tests, fluorescence intensity was low for healthy cells and high for apoptotic cells when incubated with FITC-labeled annexin A5 and A5MB. Rats treated with doxorubicin showed significant contrast opacification of the myocardium on contrast echocardiography using A5MB. However, no opacification was observed in control rats. Apoptosis was confirmed by TUNEL assay in doxorubicin treated rats. Conclusion: Acute doxorubicin-induced cardiomyopathy based on early apoptosis can be assessed and imaged with targeted ultrasound imaging using A5MB in rats.

Keywords

References

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