Cited by 49Liver physiology and pathologyDrug-Induced Hepatotoxicity and ProtectionHepatocellular Carcinoma Treatment and Prognosis

TCPOBOP‐Induced Hepatomegaly and Hepatocyte Proliferation are Attenuated by Combined Disruption of MET and EGFR Signaling

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Bhushan, Bharat, Stoops, John W., Mars, Wendy M., Orr, Anne, Bowen, William C., Paranjpe, Shirish, Michalopoulos, George K.·2019·Hepatology

Abstract

TCPOBOP (1,4‐Bis [2‐(3,5‐Dichloropyridyloxy)] benzene) is a constitutive androstane receptor (CAR) agonist that induces robust hepatocyte proliferation and hepatomegaly without any liver injury or tissue loss. TCPOBOP‐induced direct hyperplasia has been considered to be CAR‐dependent with no evidence of involvement of cytokines or growth factor signaling. Receptor tyrosine kinases (RTKs), MET and epidermal growth factor receptor (EGFR), are known to play a critical role in liver regeneration after partial hepatectomy, but their role in TCPOBOP‐induced direct hyperplasia, not yet explored, is investigated in the current study. Disruption of the RTK‐mediated signaling was achieved using MET knockout (KO) mice along with Canertinib treatment for EGFR inhibition. Combined elimination of MET and EGFR signaling [MET KO + EGFR inhibitor (EGFRi)], but not individual disruption, dramatically reduced TCPOBOP‐induced hepatomegaly and hepatocyte proliferation. TCPOBOP‐driven CAR activation was not altered in [MET KO + EGFRi] mice, as measured by nuclear CAR translocation and analysis of typical CAR target genes. However, TCPOBOP‐induced cell cycle activation was impaired in [MET KO + EGFRi] mice due to defective induction of cyclins, which regulate cell cycle initiation and progression. TCPOBOP‐driven induction of FOXM1, a key transcriptional regulator of cell cycle progression during TCPOBOP‐mediated hepatocyte proliferation, was greatly attenuated in [MET KO + EGFRi] mice. Interestingly, TCPOBOP treatment caused transient decline in hepatocyte nuclear factor 4 alpha expression concomitant to proliferative response; this was not seen in [MET KO + EGFRi] mice. Transcriptomic profiling revealed the vast majority (~40%) of TCPOBOP‐dependent genes primarily related to proliferative response, but not to drug metabolism, were differentially expressed in [MET KO + EGFRi] mice. Conclusion: Taken together, combined disruption of EGFR and MET signaling lead to dramatic impairment of TCPOBOP‐induced proliferative response without altering CAR activation.

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Authors
Bhushan, B., Stoops, J. W., Mars, W. M., Orr, A., Bowen, W. C., Paranjpe, S., & Michalopoulos, G. K.
Affiliations
University of Pittsburgh (US)
Corresponding author
Michalopoulos, George K.
Venue
Hepatology
Published
2018-12-31
Volume
69
Issue
4
Pages
1702-1718
ISSN
  • 0270-9139 (ISSN-L)
  • 1527-3350
OpenAlex
W2808462656
Cited by
49
References
42
Citations by year
2026: 2 · 2025: 8 · 2024: 7 · 2023: 6 · 2022: 6 · 2021: 4 · 2020: 11 · 2019: 5
FWCI
3.13
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Natural Science Foundation of China (81670511, 81700501)
  • National Institutes of Health (7r01dk083781-14)
  • National Cancer Institute (R01CA035373)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 83781, DK78392, DK 64008, R01DK064008, P30DK078392)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
  • Health Sciences › Medicine › Hepatology › Hepatocellular Carcinoma Treatment and Prognosis
Keywords
TCPOBOP, constitutive androstane receptor, hepatomegaly, hepatocyte proliferation, C-MET signaling, EGFR signaling, receptor tyrosine kinase, canertinib, FOXM1, HNF4α, cyclins, cell cycle regulation
MeSH terms
Forkhead Box Protein M1, Hippo Signaling Pathway, Constitutive Androstane Receptor, Animals, Cell Cycle, Female, Hepatomegaly, Pyridines, Signal Transduction, Protein Serine-Threonine Kinases, Receptors, Cytoplasmic and Nuclear, Mice, Knockout, Proto-Oncogene Proteins c-met, Gene Expression Profiling, Hepatocytes, Cell Proliferation, Hepatocyte Nuclear Factor 4, ErbB Receptors

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