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SOX2 điều chỉnh nhiều quá trình ác tính trong sự phát triển của ung thư vú thông qua trục SOX2/miR-181a-5p, miR-30e-5p/TUSC3
Tóm tắt
Mức độ cao của protein SOX2 có liên quan đến sự lan tỏa tăng cường của ung thư vú. Tuy nhiên, các cơ chế phân tử tiềm ẩn vẫn chưa được hiểu rõ hoàn toàn. Trong nghiên cứu này, chúng tôi điều tra vai trò của SOX2 trong quá trình di căn ung thư vú bằng nhiều phương pháp thử nghiệm trong ống nghiệm và trên động vật, bao gồm nuôi cấy tế bào, knockdown bằng shRNA, chữa lành vết thương, hình thành thuộc địa, buồng transwell, cấy ghép và tiêm tĩnh mạch đuôi. Hơn nữa, western blot, nhuộm miễn dịch, vi mảng và PCR thời gian thực đã được sử dụng để xác định sự thay đổi của mức độ protein và miRNA. Các thử nghiệm luciferase cũng được sử dụng để đánh giá hoạt động của TUSC3 như một mục tiêu của miR-181a-5p và miR-30e-5p, và mức độ sống sót lâm sàng được phân tích bằng phân tích Kaplan-Meier. Chúng tôi đã xác định một con đường mới liên quan đến việc điều chỉnh SOX2 đối với microRNA để kiểm soát sự tăng trưởng và di cư của tế bào ung thư vú. Knockdown shRNA của SOX2 ức chế sự mở rộng và di cư của tế bào ung thư vú. Quan trọng hơn, chúng tôi phát hiện rằng những thay đổi này đi kèm với sự giảm đáng kể mức độ của hai microRNA, miR-181a-5p và miR-30e-5p. Việc quá biểu hiện hai microRNA này dẫn đến giảm mức protein của Ứng cử viên ức chế khối u 3 (TUSC3) trong tế bào ung thư vú; các đột biến tại các vị trí liên kết tiềm năng trong 3'-UTR của TUSC3 làm mất tác dụng ức chế của các microRNA. Chúng tôi cũng phát hiện rằng việc tăng cường biểu hiện TUSC3 dẫn đến sự giảm sự tăng trưởng và di cư của các tế bào ung thư vú. Trong các mẫu ung thư vú ở người, mức độ protein TUSC3 có tương quan ngược với mức độ protein SOX2. Tổng thể, công việc của chúng tôi tiết lộ một trục điều chỉnh trung gian SOX2 mới đóng vai trò quan trọng trong sự tăng trưởng, di cư và tính xâm lấn của các tế bào ung thư vú. Nhắm mục tiêu vào trục này có thể mang lại hiệu quả tích cực trong điều trị ung thư vú.
Từ khóa
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