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Amyloid Precursor Protein As a Fibrosis Marker in Infants with Biliary Atresia

Abstract

Background: Biliary atresia (BA) is a rare condition of unknown origin in newborns with jaundice. In BA bile ducts are non-functional, causing neonatal cholestasis and following liver fibrosis and failure.

Methods: This retrospective study included liver biopsies of 14 infants with BA aged [mean ± SD] 63 ± 23 days. Patients were grouped according to the clinical course (jaundice-free vs recurrent jaundice vs required liver transplantation or liver fibrosis (Ishak fibrosis score)) and followed for 1.61-5.64 years (mean 4.03). Transcriptome profiles were assessed using a panel of 768 fibrosis-specific genes, reanalyzed via qRT-PCR, and confirmed via immunostaining. Plasma from an additional 30 BA infants and 10 age-matched controls were used for amyloid precursor protein (APP) quantification by ELISA.

Results: Different clinical outcome groups showed a homogeneous mRNA expression. Altered amyloid-metabolism-related gene expression was found between cases with Ishak fibrosis score greater than 4. Immunostaining confirmed a distinct presence of APP in the livers of all BA subjects. APP plasma levels were higher in BA than in age-matched controls and correlated with the histological fibrosis grade.

Conclusions: These results suggest that amyloidosis may contribute to BA and liver fibrosis, indicating that APP could serve as a potential liquid biomarker for these conditions.

Impact: Biliary atresia patients with higher fibrosis scores according to Ishak have higher hepatic expression of amyloid-related genes while amyloid precursor protein accumulates in the liver and increases in the circulation. After a recent study revealed beta-amyloid deposition as a mechanism potentially involved in biliary atresia, we were able to correlate amyloid-metabolism-related transcript levels as well as amyloid precursor protein tissue and plasma levels with the degree of hepatic fibrosis. These findings suggest that amyloid precursor protein is a fibrosis marker in infants with biliary atresia, reinforcing the role of amyloid metabolism in the pathogenesis of this serious disease.

References
1.
Jiang J, Wan R, He S, Wu Y, Shen Z, Chen G . Epidemiological characteristics and risk factors of biliary atresia: a case-control study. BMJ Open. 2021; 11(12):e049354. PMC: 8671910. DOI: 10.1136/bmjopen-2021-049354. View

2.
Livesey E, Cortina Borja M, Sharif K, Alizai N, McClean P, Kelly D . Epidemiology of biliary atresia in England and Wales (1999-2006). Arch Dis Child Fetal Neonatal Ed. 2009; 94(6):F451-5. DOI: 10.1136/adc.2009.159780. View

3.
The N, Honein M, Caton A, Moore C, Siega-Riz A, Druschel C . Risk factors for isolated biliary atresia, National Birth Defects Prevention Study, 1997-2002. Am J Med Genet A. 2007; 143A(19):2274-84. DOI: 10.1002/ajmg.a.31926. View

4.
Medappil N, Jacob M, Lochan R, Asthana S, Reddy J, Saif R . Kasai portoenterostomy for biliary atresia - Surgical precautions for better outcomes. J Pediatr Surg. 2018; 54(4):868-869. DOI: 10.1016/j.jpedsurg.2018.09.028. View

5.
Davenport M, Madadi-Sanjani O, Chardot C, Verkade H, Karpen S, Petersen C . Surgical and Medical Aspects of the Initial Treatment of Biliary Atresia: Position Paper. J Clin Med. 2022; 11(21). PMC: 9656543. DOI: 10.3390/jcm11216601. View