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CD81 as a tumor target
Felipe Vences-Catalán1, Caroline Duault1, Chiung-Chi Kuo1
1Division of Oncology, Department of Medicine, Stanford University School of Medicine, Stanford, CA, U.S.A.
Insights
CD81 protein is crucial for cell interactions and immune responses. It also plays a significant role in cancer progression, making it a potential therapeutic target for various cancers.
Area of Science:
- Cell Biology
- Immunology
- Oncology
Background:
- CD81 is a tetraspanin protein involved in membrane organization, protein trafficking, cellular fusion, and cell-cell interactions.
- In the immune system, CD81 regulates immune synapse formation, receptor clustering, and signaling, mediating both adaptive and innate immune suppression.
- CD81 acts as a cellular gateway for pathogens like hepatitis C virus and Plasmodium, and influences susceptibility to Listeria infection.
Purpose of the Study:
- To discuss the multifaceted roles of CD81 in biological processes.
- To highlight the involvement of CD81 in cancer progression, including tumor growth and metastasis.
- To explore the potential of CD81 as a therapeutic target in cancer treatment.
Main Methods:
- Review of existing literature on CD81 functions.
- Analysis of CD81 expression patterns in various cancer types.
- Discussion of CD81's association with other proteins and its role in signaling platforms.
Main Results:
- CD81 is implicated in regulating cell migration and invasion, contributing to cancer progression.
- CD81 is expressed across a wide range of cancers, with altered expression correlating with patient prognosis.
- CD81's association with other tetraspanins and cell-specific proteins forms signaling platforms that dictate its diverse functions.
Conclusions:
- CD81 plays a critical role in both normal cellular functions and disease states, particularly in cancer.
- The involvement of CD81 in tumor growth and metastasis suggests its potential as a therapeutic target.
- Further research into CD81's mechanisms in cancer could lead to novel treatment strategies.
Abstract:
CD81 participates in a variety of important cellular processes such as membrane organization, protein trafficking, cellular fusion and cell-cell interactions. In the immune system, CD81 regulates immune synapse, receptor clustering and signaling; it also mediates adaptive and innate immune suppression. CD81 is a gateway in hepatocytes for pathogens such as hepatitis C virus and Plasmodium; it also confers susceptibility to Listeria infection. These diverse biological roles are due to the tendency of CD81 to associate with other tetraspanins and with cell-specific partner proteins, which provide the cells with a signaling platform. CD81 has also been shown to regulate cell migration and invasion, and has therefore been implicated in cancer progression. Indeed, we have recently shown that CD81 contributes to tumor growth and metastasis. CD81 is expressed in most types of cancer, including breast, lung, prostate, melanoma, brain cancer and lymphoma, and the overexpression or down-regulation of this molecule has been correlated with either good or bad prognosis. Here, we discuss the role of CD81 in cancer and its potential therapeutic use as a tumor target.