TAILIEUCHUNG - Lederle et al. EJNMMI Research 2011, 1:26 http://www.ejnmmires.com/content/1/1/26 ORIGINAL

Lederle et al. EJNMMI Research 2011, 1:26 ORIGINAL RESEARCH Open Access Failure of annexin-based apoptosis imaging in the assessment of antiangiogenic therapy effects Wiltrud Lederle1*, Susanne Arns1, Anne Rix1, Felix Gremse1, Dennis Doleschel1, Jörn Schmaljohann2, Felix M Mottaghy2,3, Fabian Kiessling1 and Moritz Palmowski1,2,4 Abstract Background: Molecular apoptosis imaging is frequently discussed to be useful for monitoring cancer therapy. We demonstrate that the sole assessment of therapy effects by apoptosis imaging can be misleading, depending on the therapy effect on the tumor vasculature. Methods: Apoptosis was investigated by determining the uptake of Annexin Vivo by optical imaging (study part I) and of 99 mTc-6-hydrazinonicotinic [HYNIC]-radiolabeled Annexin. | Lederle et al. EJNMMI Research 2011 1 26 http content 1 1 26 9 EJNMMI Research a SpringerOpen Journal ORIGINAL RESEARCH Open Access Failure of annexin-based apoptosis imaging in the assessment of antiangiogenic therapy effects 1 11 1 1 2 Wiltrud Lederle Susanne Arns Anne Rix Felix Gremse Dennis Doleschel Jorn Schmaljohann Felix M Mottaghy2 3 Fabian Kiessling1 and Moritz Palmowski1 2 4 Abstract Background Molecular apoptosis imaging is frequently discussed to be useful for monitoring cancer therapy. We demonstrate that the sole assessment of therapy effects by apoptosis imaging can be misleading depending on the therapy effect on the tumor vasculature. Methods Apoptosis was investigated by determining the uptake of Annexin Vivo by optical imaging study part I and of 99 mTc-6-hydrazinonicotinic HYNIC -radiolabeled Annexin V by gamma counting study part II in subcutaneous epidermoid carcinoma xenografts A431 in nude mice after antiangiogenic treatment SU11248 . Optical imaging was performed by optical tomography 3D and 2D reflectance imaging control n 7 therapy n 6 . Accumulation of the radioactive tracer was determined ex vivo control n 5 therapy n 6 . Tumor vascularization was investigated with an optical blood pool marker study part I and contrast-enhanced ultrasound both studies . Data were validated by immunohistology. Results A significantly higher apoptosis rate was detected in treated tumors by immunohistological terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling staining area fraction control therapy P . However both 2D reflectance imaging using Annexin Vivo control 13 15 FI cm2 therapy 11 7 FI cm2 and gamma counting using 99 mTc-HYNIC-Annexin V tumor-to-muscle ratio control therapy failed in showing higher accumulation in treated tumors. Optical tomography even indicated higher probe accumulation in controls control pmol cm3 therapy pmol cm3 . .

TÀI LIỆU LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.