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Updated: Feb 2, 2026

The Dimethylnitrosamine Induced Liver Fibrosis Model in the Rat
Published on: June 17, 2016
Fibroblast activation protein in liver fibrosis
Angelina J Lay1, Hui Emma Zhang1, Geoffrey William McCaughan1
1Centenary Institute, Locked Bag No.6, Newtown, NSW, Australia.
Abstract:
Fibroblast activation protein (FAP) belongs to the dipeptidyl peptidase IV (DPP4; CD26) gene family. Other related genes in this family of enzyme include DPP4, 8 and 9. The FAP serine protease has the rare property of both dipeptidyl peptidase and endopeptidase activities capable of cleaving the post-proline bond at two or more residues from the N-terminus. FAP is involved in a variety of biological processes but its expression in healthy tissues is low. In contrast, FAP is significantly elevated in pathological conditions such as at sites of tissue remodelling and repair. Its differential pattern of expression in diseases supports the emerging concept for FAP as a potential disease biomarker as well as a useful therapeutic target for drug intervention. This review summarizes the current knowledge of FAP, particularly its diagnostic and pathological significance in liver fibrosis.
Insights
Fibroblast activation protein (FAP) is elevated in diseases like liver fibrosis, acting as a potential biomarker and therapeutic target. Its unique enzyme activity is key to its role in tissue repair and disease progression.
Area of Science:
- Biochemistry
- Molecular Biology
- Pathology
Background:
- Fibroblast activation protein (FAP) is an enzyme in the dipeptidyl peptidase IV (DPP4) family.
- FAP exhibits unique dipeptidyl peptidase and endopeptidase activities, cleaving specific peptide bonds.
- While FAP expression is low in healthy tissues, it is significantly upregulated in pathological conditions.
Purpose of the Study:
- To review current knowledge on FAP.
- To highlight FAP's diagnostic and pathological significance.
- To focus on FAP's role in liver fibrosis.
Main Methods:
- Literature review of FAP's biological roles.
- Analysis of FAP expression patterns in disease.
- Examination of FAP's enzymatic properties.
Main Results:
- FAP is involved in various biological processes, particularly tissue remodelling and repair.
- Elevated FAP levels are observed in pathological conditions, including liver fibrosis.
- FAP's differential expression suggests its utility as a disease biomarker.
Conclusions:
- FAP is a promising therapeutic target for drug intervention.
- FAP's role in liver fibrosis warrants further investigation.
- The unique enzymatic properties of FAP contribute to its pathological significance.
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