Khả năng kháng tương đối của virus HIV-1 nguồn đối với sự kiểm soát của interferon-alpha

Angharad E. Fenton-May1, Oliver Dibben1, Tanja Emmerich1, Haitao Ding2, Katja Pfafferott1, Marlén M. I. Aasa-Chapman3, Pierre Pellegrino4, Ian Williams4, Myron S. Cohen5, Feng Gao6, George M. Shaw7, Beatrice H. Hahn7, Christina Ochsenbauer2, John C. Kappes2,8, Persephone Borrow1
1Nuffield Department of Medicine, University of Oxford, NDM Research Building, Headington, Oxford, UK
2Department of Medicine, University of Alabama at Birmingham, Birmingham, USA
3Division of Infection and Immunity, Faculty of Medicine and Centre for Sexual Health & HIV Research, London, UK
4Centre for Sexual Health and HIV Research, Mortimer Market Centre, University College London, London, UK.
5Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, USA
6Duke Human Vaccine Institute and Department of Medicine, Duke University Medical Centre, Durham, USA
7Departments of Medicine and Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, USA
8Research Service, Birmingham Veterans Affairs Medical Center, Birmingham, USA

Tóm tắt

Tóm tắtNền tảng

Sau khi truyền HIV loại 1 (HIV-1) qua màng nhầy, interferon loại 1 (IFN) được sản xuất nhanh chóng tại các vị trí virus nhân lên ban đầu trong màng nhầy và các hạch bạch huyết thoát nước. Tuy nhiên, vai trò của hoạt động kháng virus kích thích bởi IFN trong việc hạn chế sự nhân lên của HIV-1 trong các giai đoạn đầu của nhiễm trùng vẫn chưa rõ ràng. Chúng tôi giả thuyết rằng nếu IFN loại 1 tác động chọn lọc lên sự nhân lên của HIV-1 trong những giai đoạn đầu của nhiễm trùng, các virus nguồn thành công trong việc thiết lập nhiễm trùng hệ thống sẽ kháng IFN hơn so với các virus đang nhân lên trong tình trạng nhiễm trùng mãn tính, khi mà IFN loại 1 được sản xuất ở mức thấp hơn nhiều. Để kiểm tra giả thuyết này, độ kháng tương đối của các chủng virus derived từ những cá nhân nhiễm HIV-1 trong giai đoạn cấp tính và mãn tính đối với sự kiểm soát của IFN loại 1 đã được phân tích.

Resultados

Sự nhân lên của các chủng virus huyết tương được tạo ra từ những đối tượng bị nhiễm HIV-1 cấp tính và các chủng HIV-1 nguồn được nhân bản phân tử có thể bị giảm nhưng không bị ức chế hoàn toàn bởi IFN loại 1in vitro. Giá trị IC50trung bình đối với IFNα2 (22 U/ml) thấp hơn so với IFNβ (346 U/ml), mặc dù ở nồng độ ức chế tối đa, cả hai loại IFN đều ức chế sự nhân lên của virus ở mức độ tương tự. Các chủng virus riêng lẻ cho thấy độ nhạy khác nhau đối với sự ức chế bởi IFNα2 và IFNβ, có thể phản ánh sự biến đổi trong khả năng kháng đối với các gen kích thích IFN điều chỉnh khác nhau. Các chủng virus từ những đối tượng bị nhiễm HIV-1 cấp tính có độ kháng significantly cao hơn đối với sự kiểm soátin vitrodo IFNα hơn là các chủng virus được tạo ra từ cùng một cá nhân trong giai đoạn mãn tính, không triệu chứng. Kháng virus IFN giảm nhanh chóng sau giai đoạn cấp tính của nhiễm trùng: trong năm đối tượng, các virus derived từ sáu tháng mẫu đồng thuận phân tử có độ nhạy cao hơn đáng kể với các tác động kháng virus của IFN so với các virus nguồn tương ứng.

Từ khóa

#HIV-1 #interferon-alpha #khả năng kháng #nhiễm trùng cấp tính #sự kiểm soát virus

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