A Network Map of Intracellular Alpha-Fetoprotein Signalling in Hepatocellular Carcinoma
Krishnapriya Ramakrishnan1, Diya Sanjeev1, Niyas Rehman1
1Centre for Integrative Omics Data Science, Yenepoya (Deemed to Be University), Mangalore, India.
Insights
Alpha fetoprotein (AFP) is a key biomarker for liver cancer (HCC). Further research into its signalling pathway is needed to understand its roles in immune suppression and malignant transformation for improved diagnostics and therapeutics.
Area of Science:
- Biochemistry
- Oncology
- Immunology
Background:
- Alpha fetoprotein (AFP) is a fetal glycoprotein and a recognized biomarker for hepatocellular carcinoma (HCC).
- Elevated AFP levels are observed in various liver conditions, including viral hepatitis, fibrosis, cirrhosis, and HCC.
- AFP functions as an immune suppressor and promotes malignant transformation in HCC patients.
Purpose of the Study:
- To elucidate the comprehensive signalling pathway of AFP.
- To investigate the distinct roles of intracellular and secreted AFP in HCC pathophysiology.
- To explore potential theranostic applications based on a deeper understanding of AFP signalling.
Main Methods:
- Review of existing literature on AFP's role in liver pathologies.
- Analysis of reported interactions between AFP, its receptor (AFPR), and intracellular molecules (e.g., PTEN, Caspase, RAR).
- Discussion of the need for a comprehensive map of the AFP signalling pathway.
Main Results:
- AFP is secreted by hepatocytes and binds to its receptor, AFPR, to exert its functions.
- AFP interacts with multiple intracellular molecules, indicating complex signalling.
- Cellular and secreted AFP exhibit different roles in HCC.
Conclusions:
- There is a critical need for more insight into the AFP signalling pathway, treating it as a classical intracellular pathway.
- A comprehensive map of AFP signalling is essential for advancing theranostic strategies in HCC.
- Understanding AFP's multifaceted roles can lead to novel diagnostic and therapeutic approaches.
Abstract:
Alpha fetoprotein (AFP) is a glycoprotein of foetal origin belonging to the albumin protein family. Serum AFP is a long-conceived early-diagnostic biomarker for HCC with its elevated expression in different liver pathologies ranging from hepatitis viral infections to fibrosis, cirrhosis, and HCC. Beyond their utility as biomarkers, in support of its contribution to these clinical outcomes, the function of AFP as an immune suppressor and inducer of malignant transformation in HCC patients is well reported. Multiple reports show that AFP is secreted by hepatocytes, binds to its cognate receptor, AFP-receptor (AFPR), and exerts its actions. However, there is only limited information available in this context. There is an urgent need to gather more insight into the AFP signalling pathway and consider it a classical intracellular signalling pathway, among others. AFP is a highly potent intracellular molecule that has the potential to bind to many interactors like PTEN, Caspase, RAR, and so on. It has been shown that cellular AFP and secreted AFP have different roles in HCC pathophysiology, and a comprehensive map of the AFP signalling pathway is warranted for further theranostic applications.
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