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相关概念视频

Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...

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相关实验视频

Updated: Jun 18, 2026

Peptide-based Identification of Functional Motifs and their Binding Partners
14:28

Peptide-based Identification of Functional Motifs and their Binding Partners

Published on: July 1, 2013

艾滋病毒-1 Nef通过PACS-1和PI3K调节的ARF6内细胞通路向下调节MHC-I.

Anastassia D Blagoveshchenskaya1, Laurel Thomas, Sylvain F Feliciangeli

  • 1Vollum Institute, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.

Cell
|January 16, 2003
PubMed
概括
此摘要是机器生成的。

人类免疫缺陷病毒1型 (HIV-1) Nef蛋白质劫持了ARF6内细胞通路,以降低MHC-I分子的调节,从而使免疫规避. 这一过程涉及Nef,PACS-1和PI3K,揭示了病毒免疫规避的新型细胞机制.

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Assessing the Innate Sensing of HIV-1 Infected CD4+ T Cells by Plasmacytoid Dendritic Cells Using an Ex vivo Co-culture System.
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Published on: December 23, 2016

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Last Updated: Jun 18, 2026

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14:28

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Assessing the Innate Sensing of HIV-1 Infected CD4+ T Cells by Plasmacytoid Dendritic Cells Using an Ex vivo Co-culture System.
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Published on: December 23, 2016

科学领域:

  • 病毒学 病毒学
  • 细胞生物学 细胞生物学
  • 免疫学 免疫学 免疫学

背景情况:

  • 艾滋病毒-1 Nef蛋白降低细胞表面MHC-I分子的调节.
  • 这种下调有助于HIV-1逃避免疫监测.
  • 尼夫用于MHC-I下调的特定细胞通路仍然未知.

研究的目的:

  • 阐明HIV-1 Nef用于MHC-I下调的细胞通路.
  • 调查Nef图案,PACS-1和ARF6通路在这个过程中的作用.

主要方法:

  • 研究了Nef,PACS-1和ARF6内细胞通路之间的相互作用.
  • 利用PI3K依赖的过程来研究MHC-I下调.
  • 分析了特定的Nef基因 (酸性,SH3结合部位,M(20)) 在控制细胞分类和蛋白质定位方面的功能.

主要成果:

  • 尼夫和PACS-1合作劫持ARF6内细胞通路.
  • 这种夺取取决于PI3K信号传输.
  • 在跨高尔基网络 (TGN) 的PACS-1依赖分类,ARF6激活和TGN的MHC-I封存中,有三个不同的Nef动机至关重要.

结论:

  • 尼夫利用一种依赖PI3K的机制,涉及PACS-1和ARF6通路,将细胞表面MHC-I调低到TGN.
  • 这项研究揭示了HIV-1免疫规避策略的细胞基础的关键见解.
  • 这些发现突出了病毒蛋白和宿主细胞机制之间的复杂相互作用,用于免疫逃避.