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Peptit giải phóng gastrin kích thích phản ứng xơ hóa ở tế bào MRC5 và tăng sinh ở tế bào A549
Tóm tắt
Xơ phổi vô căn (IPF) là một bệnh lý phổi phức tạp, trong đó sự hình thành mô sẹo được gây ra bởi nhiều phân tử khác nhau. Peptit giải phóng gastrin (GRP) được tiết ra từ các tế bào nội tiết thần kinh phổi, đại thực bào phế nang và một số đầu dây thần kinh trong phổi. Vai trò tiềm năng của GRP trong IPF vẫn chưa rõ ràng. Chúng tôi nhằm mục đích điều tra phản ứng xơ hóa với GRP ở mức độ tế bào trong các dòng tế bào MRC5 và A549. Các hiệu ứng tăng sinh và xơ hóa của GRP trên các tế bào này được đánh giá bằng cách sử dụng BrdU, phương pháp miễn dịch phân tích, miễn dịch huỳnh quang và qRT-PCR cho các phân tử liên quan đến phân hóa myofibroblast, TGF-β và tín hiệu Wnt. Tất cả các liều GRP đều làm tăng lượng BrdU được đưa vào các tế bào A549. Ngược lại, lượng BrdU tăng lên ở các tế bào MRC5 trong 24 giờ đầu tiên, nhưng sau đó giảm dần đến 72 giờ. GRP không kích thích sự chuyển đổi biểu mô-mesenchymal ở các tế bào A549, thay vào đó, nó kích thích sự phân hóa của các tế bào MRC5 thành myofibroblast. Hơn nữa, GRP đã kích thích sự biểu hiện gene và protein của p-Smad2/3 và Smad4, và giảm mức độ Smad7 ở các tế bào MRC5. Ngoài ra, GRP đã làm giảm mức protein Wnt5a và kích thích sự hoạt hóa β-catenin bằng cách tăng mức độ protein Wnt4, Wnt7a và β-catenin. GRP đã gây ra sự phân hóa myofibroblast bằng cách kích thích các con đường TGF-β và Wnt thông qua tín hiệu ngoại tiết và tự tiết trong các tế bào MRC5. Kết luận, GRP có thể dẫn đến xơ phổi do các tác động tăng sinh và xơ hóa của nó lên các tế bào fibroblast phổi. Việc ngăn chặn sự kích hoạt tín hiệu trung gian GRP có thể được xem như một phương pháp điều trị cho các bệnh phổi xơ hóa.
Từ khóa
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