TAILIEUCHUNG - Báo cáo khoa học: " A specific inhibitor of protein kinase CK2 delays gamma-H2Ax foci removal and reduces clonogenic survival of irradiated mammalian cells"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: A specific inhibitor of protein kinase CK2 delays gamma-H2Ax foci removal and reduces clonogenic survival of irradiated mammalian cells. | Zwicker et al. Radiation Oncology 2011 6 15 http content 6 1 15 RADIATION ONCOLOGY RESEARCH Open Access A specific inhibitor of protein kinase CK2 delays gamma-H2Ax foci removal and reduces clonogenic survival of irradiated mammalian cells 1 1 1 Felix Zwicker Maren Ebert Peter E Huber Jurgen Debus Klaus-Josef Weber Abstract Background The protein kinase CK2 sustains multiple pro-survival functions in cellular DNA damage response and its level is tightly regulated in normal cells but elevated in cancers. Because CK2 is thus considered as potential therapeutic target DNA double-strand break DSB formation and rejoining apoptosis induction and clonogenic survival was assessed in irradiated mammalian cells upon chemical inhibition of CK2. Methods MRC5 human fibroblasts and WIDR human colon carcinoma cells were incubated with highly specific CK2 inhibitor 4 5 6 7-tetrabromobenzotriazole TBB or mock-treated 2 hours prior to irradiation. DSB was measured by pulsed-field electrophoresis PFGE as well as gamma-H2AX foci formation and removal. Apoptosis induction was tested by DAPI staining and sub-G1 flow cytometry survival was quantified by clonogenic assay. Results TBB treatment did not affect initial DNA fragmention PFGE up to 80 Gy or foci formation 1 Gy . While DNA fragment rejoining PFGE was not inhibited by the drug TBB clearly delayed gamma-H2AX foci disappearence during postirradiation incubation. No apoptosis induction could be detected for up to 38 hours for both cell lines and exposure conditions monotherapies or combination but TBB treatment at this moderately toxic concentration of 20 dM about 40 survival enhanced radiation-induced cell killing in the clonogenic assay. Conclusions The data imply a role of CK2 in gamma-H2AX dephosporylation most likely through its known ability to stimulate PP2A phosphatase rather than DSB rejoining. The slight but definite clonogenic radiosensitization by TBB does apparently not result from .

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.