p55PIK-PI3K kích thích quá trình hình thành mạch trong tế bào ung thư đại trực tràng thông qua việc kích hoạt con đường NF-κB

Angiogenesis - Tập 16 - Trang 561-573 - 2013
Guihua Wang1, Cheng Chen1, Rui Yang1, Xiaonian Cao1, Senyan Lai1, Xuelai Luo1, Yongdong Feng2, Xianmin Xia1, Jianping Gong2, Junbo Hu1
1Cancer Research Institute, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
2Department of Molecular Medical Center, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China

Tóm tắt

Yếu tố tăng trưởng mạch (VEGF) là một trung gian quan trọng trong quá trình hình thành mạch. PI3K đóng vai trò thiết yếu trong quá trình hình thành mạch; tuy nhiên, các cơ chế và chức năng cụ thể của từng isoform của các thành viên PI3K trong việc điều chỉnh hình thành mạch ở khối u vẫn chưa được hiểu rõ hoàn toàn. Trong nghiên cứu này, chúng tôi đánh giá vai trò của p55PIK, một tiểu đơn vị điều chỉnh PI3K do gen PIK3R3 mã hóa, trong quá trình hình thành mạch ở khối u. Chúng tôi báo cáo rằng sự biểu hiện quá mức của p55PIK trong các tế bào ung thư làm tăng biểu hiện HIF-1α và tăng biểu hiện VEGF. Hơn nữa, sự biểu hiện quá mức của p55PIK làm tăng quá trình hình thành mạch khối u trong môi trường sống và trong ống nghiệm. Thêm vào đó, dữ liệu chỉ ra rằng sự gia tăng biểu hiện HIF-1α do p55PIK-PI3K phụ thuộc vào khả năng kích hoạt các con đường tín hiệu NF-кB, đặc biệt là làm tăng phosphorylation của các tiểu đơn vị p65 của NF-κB. Nghiên cứu của chúng tôi gợi ý rằng p55PIK-PI3K là yếu tố thiết yếu trong việc điều chỉnh quá trình hình thành mạch trung gian tế bào ung thư và góp phần vào sự tăng trưởng khối u, đồng thời p55PIK cung cấp một mục tiêu tiềm năng và cụ thể cho sự phát triển thuốc chống hình thành mạch mới.

Từ khóa

#hình thành mạch #VEGF #PI3K #NF-κB #ung thư đại trực tràng

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