TAILIEUCHUNG - báo cáo khoa học: " Response to dexamethasone is glucose-sensitive in multiple myeloma cell lines"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Response to dexamethasone is glucose-sensitive in multiple myeloma cell lines | Journal of Experimental Clinical Cancer Research Friday et al. Journal of Experimental Clinical Cancer Research 2011 30 81 http content 30 1 81 RESEARCH Open Access Response to dexamethasone is glucose-sensitive in multiple myeloma cell lines Ellen Friday 1 Johnathan Ledet1 and Francesco Turturro1 2 Abstract Background Hyperglycemia is among the major side effects of dexamethasone DEX . Glucose or glucocorticoid GC regulates the expression of thioredoxin-interacting protein TXNIP that controls the production of reactive oxygen species ROS through the modulation of thioredoxin TRX activity. Methods Multiple myeloma MM cells were grown in 5 or 20 mM L glucose with or without 25 dM DEX. Semiquantitative reverse transcription-PCR RT-PCR was used to assess TXNIP RNA expression in response to glucose and DEX. ROS were detected by 5-6-chloromethyl-2 7 -dichlorodihydrofluorescein diacetate CM-H2DCFDA . TRX activity was assayed by the insulin disulfide-reducing assay. Proliferation was evaluated using CellTiter96 reagent with 490-nm absorbtion and used to calculate the DEX IC50 in 20 mM L glucose using the Chou s dose effect equation. Results TXNIP RNA level responded to glucose or DEX with the same order of magnitude ARH77 NCIH929 U266B1 in these cells. MC CAR cells were resistant to the regulation. ROS level increased concurrently with reduced TRX activity. Surprisingly glucose increased TRX activity in MC CAR cells keeping ROS level low. DEX and glucose were lacking the expected additive effect on TXNIP RNA regulation when used concurrently in sensitive cells. ROS level was significantly lower when DEX was used in conditions of hyperglycemia in ARH77 NCIH9292 cells but not in U266B1 cells. Dex-IC50 increased 10-fold when the dose response effect of DEX was evaluated with glucose in ARH and MC Car cells Conclusions Our study shows for the first time that glucose or DEX regulates important components of ROS production through TXNIP modulation or direct .

TỪ KHÓA 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.