TAILIEUCHUNG - Báo cáo y học: "HIV-1 is budded from CD4+ T lymphocytes independently of exosomes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: HIV-1 is budded from CD4+ T lymphocytes independently of exosomes | Park and He Virology Journal 2010 7 234 http content 7 1 234 VIROLOGY JOURNAL SHORT REPORT Open Access HIV-1 is budded from CD4 T lymphocytes independently of exosomes In-Woo Park1 2 Johnny J He1 2 Abstract The convergence of HIV-1 budding and exosome biogenesis at late endosomal compartments called multivesicular bodies has fueled the debate on whether HIV-1 is budded from its target cells and transmitted in the form of exosomes. The point of contention appears to primarily derive from the types of target cells in question and lack of a well-defined protocol to separate exosomes from HIV-1. In this study we adapted and established a simplified protocol to define the relationship between HIV-1 production and exosome biogenesis. Importantly we took advantage of the newly established protocol to unequivocally show that HIV-1 was produced from CD4 T lymphocytes Jurkat cells independently of exosomes. Thus this study not only presents a simplified way to obtain highly purified HIV-1 virions for identification of host proteins packaged into virions but also provides a technical platform that can be employed to define the relationship between exosome biogenesis and budding of HIV-1 or other viruses and its contributions to viral pathogenesis. Text Exosomes were initially identified as small membrane vesicles from immature red blood cells 1 and have since been detected in various mammalian cells tissues and physiological fluids see a recent review 2 . They are originated from multivesicular bodies through direct fusion with plasma membrane 3 4 with sizes ranging between 30 and 100 nm 5 6 . Several important functions have been attributed to these small vesicles these include protein homeostasis 7 humoral immune response 5 8-10 cell-cell interaction 11 12 and antitumor activity 6 . In addition exosomes have also been proposed to play an important role in HIV-1 budding and infection 13 as exosomes and HIV-1 converge at the endosomes and share similar host

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