Thách thức vai trò của CD44 và thụ thể lipoprotein bị kích thích bởi lipolysis trong việc truyền tải độc tính của iota toxin Clostridium perfringens trong ung thư vú

Molecular Cancer - Tập 13 - Trang 1-15 - 2014
Katerina D Fagan-Solis1, Denise K Reaves1, M Cristina Rangel2, Michel R Popoff3, Bradley G Stiles4, Jodie M Fleming1
1Department of Biology, North Carolina Central University, Durham, USA
2Tumor Growth Factor Section, Laboratory of Cancer Prevention, Frederick National Laboratory for Cancer Research, Frederick, USA
3Institut Pasteur, Anaerobic Bacteria and Toxins Unit, Paris, France
4Department of Biology, Wilson College, Chambersburg, USA

Tóm tắt

Khám phá dịch chuyển của các độc tố vi khuẩn đã trở thành trọng tâm nghiên cứu do tiềm năng của chúng như một công cụ hóa trị liệu. Các nghiên cứu ở một số mô đã chỉ ra rằng iota toxin của Clostridium perfringens gắn vào CD44 và thụ thể lipoprotein bị kích thích bởi lipolysis (LSR) trên bề mặt tế bào. Gần đây, chúng tôi đã chứng minh rằng sự biểu hiện của LSR tương quan với ung thư vú dương tính với thụ thể estrogen và rằng tín hiệu LSR chỉ đạo các hành vi của tế bào khởi phát khối u một cách nguy hiểm. Trong tài liệu này, chúng tôi xác định các cơ chế độc tính của iota toxin trong một mô hình ung thư vú đặc hiệu theo mô, với mục tiêu cuối cùng là thiết lập nền tảng cho việc sử dụng iota toxin như một liệu pháp nhằm mục tiêu trong ung thư vú. Các hệ thống mô hình in vitro được sử dụng để xác định tác động độc tính của iota toxin trên các phân nhóm nội tại của ung thư vú. Việc sử dụng công nghệ overexpression và knockdown đã xác nhận vai trò của LSR và CD44 trong việc điều tiết sự nội bào của iota toxin và sự khởi phát cái chết tế bào. Cuối cùng, các thử nghiệm độc tính được sử dụng để chứng minh tác động của iota toxin trên một tập hợp đã được xác thực của các dòng tế bào ung thư vú kháng tamoxifen. Điều trị 14 dòng tế bào ung thư vú cho thấy rằng các dòng LSR+/CD44- rất nhạy cảm, các dòng LSR+/CD44+ chỉ nhạy cảm một chút, và các dòng LSR-/CD44+ kháng lại độc tính của iota. Sự giảm biểuh hiện của LSR dẫn đến một sự giảm đáng kể trong độ nhạy cảm với độc tố; tuy nhiên, sự biểu hiện quá mức của CD44 lại mang lại khả năng kháng độc tố. Sự biểu hiện quá mức CD44 tương quan với việc giảm hình thành lysosome bị kích thích bởi độc tố và mức độ iota toxin trong bào tương giảm. Những phát hiện này chỉ ra rằng sự biểu hiện của CD44 điều chỉnh khả năng kháng độc tố iota thông qua việc ức chế sự nội bào trong các tế bào ung thư vú, một vai trò chưa được xác định trước đó đối với CD44. Hơn nữa, các tế bào ung thư vú kháng tamoxifen biểu hiện mức độ LSR cao và rất nhạy cảm với độc tính do iota gây ra. Tập hợp các dữ liệu này là lần đầu tiên cho thấy iota toxin có khả năng trở thành một liệu pháp điều trị nhắm mục tiêu hiệu quả cho ung thư vú.

Từ khóa

#iota toxin #Clostridium perfringens #ung thư vú #CD44 #thụ thể lipoprotein bị kích thích bởi lipolysis #độc tính tế bào

Tài liệu tham khảo

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