Mô hình Khảm Lỏng về Cấu Trúc của Màng Tế Bào
Tóm tắt
cho thấy các hiệu ứng đáng kể được tạo ra trên bạch cầu lympho khi bổ sung các kháng thể nhắm vào các phân tử miễn dịch bề mặt của chúng. Các kháng thể gây ra sự tái phân bố và ẩm bào của các phân tử miễn dịch bề mặt này, do đó trong khoảng 30 phút ở 37°C, các phân tử miễn dịch bề mặt hoàn toàn bị loại ra khỏi màng. Những hiệu ứng này không xảy ra, tuy nhiên, nếu các kháng thể hoá trị đôi được thay thế bằng các đoạn Fab hoá trị đơn của chúng hoặc nếu các thí nghiệm kháng thể được thực hiện ở 0°C thay vì 3°C. Những kết quả này và các kết quả liên quan khác mạnh mẽ chỉ ra rằng các kháng thể bivalen tạo ra sự tập hợp của các phân tử miễn dịch bề mặt ở cấu trúc mặt phẳng của màng, điều này chỉ xảy ra nếu các phân tử miễn dịch có thể tự do khuếch tán trong màng. Sự tập hợp sau đó kích hoạt ẩm bào các thành phần màng bằng một cơ chế chưa được biết đến. Những biến đổi màng như vậy có thể có tầm quan trọng rất lớn trong việc kích thích phản ứng kháng thể đối với kháng nguyên, cũng như trong các quá trình khác của sự phân hóa tế bào.
Từ khóa
#Màng tế bào #mô hình khảm lỏng #protein màng #phospholipid #tương tác màng-ligand #nhiệt động lực học #chuyển hóa ác tính #miễn dịch bạch cầu #concanavalin A #SV40 #ẩm bào #miễn dịch bề mặt #kháng thể.Tài liệu tham khảo
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