A research group led by Prof. Li Guohui from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), in collaboration with Prof. Chen Jianfeng's group from Shanghai Institute of Biochemistry and Cell Biology of CAS, revealed the regulation mechanism of integrin α4β7 mediated human immunodeficiency virus 1 (HIV-1) infection.
This study was published in Signal Transduction and Targeted Therapy on July 16.
Integrin α4β7, an important cell surface adhesion molecule, is responsible for mediating lymphocytes from blood circulation into the intestine and central nervous system. The abnormality of its function is closely related to human autoimmune diseases.
Previous studies have shown that intestinal homing CD4+ T cells expressing integrin α4β7 are the early targets of HIV-1 virus infection, which plays an important role in the pathogenesis of HIV-1 infection.
The binding between the envelope protein gp120 located on the surface of the HIV-1 virus and the receptors on the surface of CD4+ T cells is a key step for HIV-1 to infect T cells.
In this study, the researchers investigated the interaction between integrin α4β7 and gp120. They found that specific intestinal chemokines could stimulate integrin α4β7 in a relatively stretched condition, leading to a highly activated conformation state, and it enabled integrin α4β7 to bind the HIV-1 envelope protein gp120. While, the inactive integrin α4β7 exhibited no binding ability with HIV-1 envelope protein gp120.
Moreover, they indicated that the interactions between the metal ion-dependent adhesion site (MIDAS) in the integrin β7 subunit and the highly conserved tripeptide LDI in the HIV-1 envelope protein gp120 were the key site for integrin α4β7 mediated HIV-1 infection.
In addition, they also found that the interactions between integrin α4β7 and HIV-1 envelope protein gp120 might activate multiple intracellular signaling pathways, which further regulated HIV-1 virus replication and T cell function.
"This study would provide new strategies and ideas for the prevention and treatment of HIV-1 infection and the screening of related drugs," said Prof. Li.
More information:
Shu Wang et al, Distinct chemokines selectively induce HIV-1 gp120-integrin α4β7 binding via triggering conformer-specific activation of α4β7, Signal Transduction and Targeted Therapy (2021). DOI: 10.1038/s41392-021-00582-8
Let us know if there is a problem with our content
Use this form if you have come across a typo, inaccuracy or would like to send an edit request for the content on this page.
For general inquiries, please use our contact form.
For general feedback, use the public comments section below (please adhere to guidelines).
Thank you for taking time to provide your feedback to the editors
Your feedback is important to us. However, we do not guarantee individual replies due to the high volume of messages.
Donate and enjoy an ad-free experience
We keep our content available to everyone.
Consider supporting Science X's mission by getting a premium account.
This article has been reviewed according to Science X's editorial process
and policies.
Editors
have highlighted the following attributes while ensuring the content's credibility:
Medical Xpress is a web-based medical and health news service that is part of the renowned Science X network.
Based on the years of experience as a Phys.org medical research channel, started in April 2011, Medical Xpress became a separate website.
Medical Xpress is a part of Science X network.
With global reach of over 5 million monthly readers and featuring dedicated websites for hard sciences, technology, smedical research and health news,
the Science X network is one of the largest online communities for science-minded people.