Cited by 65Cancer-related Molecular PathwaysHepatocellular Carcinoma Treatment and PrognosisLiver physiology and pathology

Activation of v-Myb avian myeloblastosis viral oncogene homolog-like2 (MYBL2)-LIN9 complex contributes to human hepatocarcinogenesis and identifies a subset of hepatocellular carcinoma with mutant p53

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Calvisi, Diego F., Simile, Maria M., Ladu, Sara, Frau, Maddalena, Evert, Matthias, Tomasi, Maria L., Demartis, Maria I., Daino, Lucia +4 more·2011·Hepatology

Abstract

Up-regulation of the v-Myb avian myeloblastosis viral oncogene homolog-like2 B-Myb ( MYBL2 ) gene occurs in human hepatocellular carcinoma (HCC) and is associated with faster progression of rodent hepatocarcinogenesis. We evaluated, in distinct human HCC prognostic subtypes (as defined by patient survival length), activation of MYBL2 and MYBL2 -related genes, and relationships of p53 status with MYBL2 activity. Highest total and phosphorylated protein levels of MYBL2, E2F1-DP1, inactivated retinoblastoma protein (pRB), and cyclin B1 occurred in HCC with poorer outcome (HCCP), compared to HCC with better outcome (HCCB). In HCCP, highest LIN9-MYBL2 complex (LINC) and lowest inactive LIN9-p130 complex levels occurred. MYBL2 positively correlated with HCC genomic instability, proliferation, and microvessel density, and negatively with apoptosis. Higher MYBL2/LINC activation in HCC with mutated p53 was in contrast with LINC inactivation in HCC harboring wildtype p53. Small interfering RNA (siRNA)-mediated MYBL2/LINC silencing reduced proliferation, induced apoptosis, and DNA damage at similar levels in HCC cell lines, irrespective of p53 status. However, association of MYBL2/LINC silencing with doxorubicin-induced DNA damage caused stronger growth restraint in p53-/- Huh7 and Hep3B cells than in p53+/+ Huh6 and HepG2 cells. Doxorubicin triggered LIN9 dissociation from MYBL2 in p53+/+ cell lines and increased MYBL2-LIN9 complexes in p53-/- cells. Doxorubicin-induced MYBL2 dissociation from LIN9 led to p21WAF1 up-regulation in p53+/+ but not in p53-/- cell lines. Suppression of p53 or p21WAF1 genes abolished DNA damage response, enhanced apoptosis, and inhibited growth in doxorubicin-treated cells harboring p53+/+. Conclusion: We show that MYBL2 activation is crucial for human HCC progression. In particular, our data indicate that MYBL2-LIN9 complex integrity contributes to survival of DNA damaged p53-/- cells. Thus, MYBL2 inhibition could represent a valuable adjuvant for treatments against human HCC with mutated p53. (HEPATOLOGY 2011;)

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  • The DREAM complex is stabilized and recruited to target gene promoters when p21 is activated by p53.

    “Further, the DREAM complex is stabilized and recruited to target gene promoters when p21 is activated by p53.107, 108, 109, 110, 111, 112, 113, 114”

    From Census and evaluation of p53 target genes (2017) · cites this paper as [108]

  • MSH2, RAD51 and RECQL4 were thought to be direct p53 targets, but are indirectly repressed through the DREAM complex.

    “Although several DNA repair genes, including MSH2,172 RAD51173 and RECQL4,87 were thought to be direct p53 targets, it has become evident that they are indirectly repressed through the DREAM complex.18, 108, 114”

    From Census and evaluation of p53 target genes (2017) · cites this paper as [108]

  • Stabilization of the DREAM complex and its recruitment to target gene promoters leads to indirect p53-mediated downregulation of cell cycle genes such as CDK1, Cyclin A and B, CDC25C, MYBL2 (B-MYB), PLK1 and hundreds more, all of which are required for cell cycle progression.

    “Stabilization of the DREAM complex and its recruitment to target gene promoters leads to indirect p53-mediated downregulation of cell cycle genes such as CDK1, Cyclin A and B, CDC25C, MYBL2 (B-MYB), PLK1 and hundreds more, all of which are required for cell cycle progression.18, 108, 114”

    From Census and evaluation of p53 target genes (2017) · cites this paper as [108]

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  1. [14]14. Zondervan PE, Wink J, Alers JC, IJzermans JN, Schalm SW, de Man RA, et al. Molecular cytogenetic evaluation of virus-associated and nonviral hepatocellular carcinoma: analysis of 26 carcinomas and 12 concurrent dysplasias. J Pathol 2000;192:207-215.
  2. [17]17. Nakajima T, Yasui K, Zen K, Inagaki Y, Fujii H, Minami M, et al. Activation of MYBL2 by E2F1 in hepatocellular carcinoma. Hepatol Res 2008;38:886-895.
  3. [33]33. Bunz F, Dutriaux A, Lengauer C, Waldman T, Zhou S, Brown JP , et al. Requirement for p53 and p21 to sustain G2 arrest after DNA damage. Science 1998;282:1497-1501.

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Authors
Calvisi, D. F., Simile, M. M., Ladu, S., Frau, M., Evert, M., Tomasi, M. L., Demartis, M. I., Daino, L., Seddaiu, M. A., Brozzetti, S., Feo, F., & Pascale, R. M.
Affiliations
  • University of Sassari (IT)
  • Universität Greifswald (DE)
  • Sapienza University of Rome (IT)
Corresponding author
Pascale, Rosa M.
Venue
Hepatology
Published
2011-04
Volume
53
Issue
4
Pages
1226-1236
ISSN
0270-9139 (ISSN-L)
OpenAlex
W2127517922
Cited by
65
References
41
Citations by year
2025: 2 · 2023: 8 · 2022: 7 · 2021: 7 · 2020: 5 · 2019: 4 · 2018: 5 · 2017: 7 · 2016: 1 · 2015: 4 · 2014: 1 · 2013: 7 · 2012: 7
FWCI
2.36
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • IRIS Research product catalog (Sapienza University of Rome) (submittedVersion)
  • UnissResearch (Università degli Studi di Sassari) (submittedVersion)
  • INFM-OAR (INFN Catania) (submittedVersion, other-oa)
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Health Sciences › Medicine › Hepatology › Hepatocellular Carcinoma Treatment and Prognosis
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
Keywords
MYBL2, hepatocellular carcinoma, hepatocarcinogenesis, TP53 mutation, retinoblastoma protein, cyclin B1, p21, doxorubicin, DNA damage response, apoptosis, tumor progression, prognostic subtypes, genomic instability
MeSH terms
DNA Damage, Doxorubicin, Carcinoma, Hepatocellular, Humans, Liver Neoplasms, Nuclear Proteins, Trans-Activators, Up-Regulation, Tumor Suppressor Protein p53, Disease Progression, Cell Cycle Proteins, Tumor Suppressor Proteins, Genomic Instability, Cell Line, Tumor

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