Bourque, G.

Fu, P.Y.

Gong, Z.

Govindarajan, K.R.

Lam, S.H.

Lee, S.G.

Li, H.

Lin, C.Y.

Liu, E.T.

Lufkin, T.

Mathavan, S.

Murthy, K.R.

Nick, L.C.

Thomsen, J.S.

PubMed

ScholarBank@NUS

Molecular conservation of estrogen-response associated with cell cycle regulation, hormonal carcinogenesis and cancer in zebrafish and human cancer cell lines

Siew Hong Lam

Serene GP Lee

Chin Y Lin

Jane S Thomsen

Pan Y Fu

Karuturi RK Murthy

Haixia Li

Kunde R Govindarajan

Lin CH Nick

Guillaume Bourque

Zhiyuan Gong

Thomas Lufkin

Edison T Liu

Sinnakaruppan Mathavan

Springer - Publisher Connector

BACKGROUND: The zebrafish is recognized as a versatile cancer and drug screening model. However, it is not known whether the estrogen-responsive genes and signaling pathways that are involved in estrogen-dependent carcinogenesis and human cancer are operating in zebrafish. In order to determine the potential of zebrafish model for estrogen-related cancer research, we investigated the molecular conservation of estrogen responses operating in both zebrafish and human cancer cell lines.
METHODS: Microarray experiment was performed on zebrafish exposed to estrogen (17β-estradiol; a classified carcinogen) and an anti-estrogen (ICI 182,780). Zebrafish estrogen-responsive genes sensitive to both estrogen and anti-estrogen were identified and validated using real-time PCR. Human homolog mapping and knowledge-based data mining were performed on zebrafish estrogen responsive genes followed by estrogen receptor binding site analysis and comparative transcriptome analysis with estrogen-responsive human cancer cell lines (MCF7, T47D and Ishikawa).
RESULTS: Our transcriptome analysis captured multiple estrogen-responsive genes and signaling pathways that increased cell proliferation, promoted DNA damage and genome instability, and decreased tumor suppressing effects, suggesting a common mechanism for estrogen-induced carcinogenesis. Comparative analysis revealed a core set of conserved estrogen-responsive genes that demonstrate enrichment of estrogen receptor binding sites and cell cycle signaling pathways. Knowledge-based and network analysis led us to propose that the mechanism involving estrogen-activated estrogen receptor mediated down-regulation of human homolog HES1 followed by up-regulation cell cycle-related genes (human homologs E2F4, CDK2, CCNA, CCNB, CCNE), is highly conserved, and this mechanism may involve novel crosstalk with basal AHR. We also identified mitotic roles of polo-like kinase as a conserved signaling pathway with multiple entry points for estrogen regulation.
CONCLUSION: The findings demonstrate the use of zebrafish for characterizing estrogen-like environmental carcinogens and anti-estrogen drug screening. From an evolutionary perspective, our findings suggest that estrogen regulation of cell cycle is perhaps one of the earliest forms of steroidal-receptor controlled cellular processes. Our study provides first evidence of molecular conservation of estrogen-responsiveness between zebrafish and human cancer cell lines, hence demonstrating the potential of zebrafish for estrogen-related cancer research

Lam, Siew Hong

Lee, Serene G P

Lin, Chin Y

Thomsen, Jane S

Fu, Pan Y

Murthy, Karuturi R K

Li, Haixia

Govindarajan, Kunde R

Nick, Lin C H

Bourque, Guillaume

Gong, Zhiyuan

Lufkin, Thomas

Liu, Edison T

Mathavan, Sinnakaruppan

The Jackson Laboratory: The Mouseion at the JAXlibrary

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http://scholarbank.nus.edu.sg/bitstream/10635/101132/1/2011-molecular_conservation_estrogen_response-published.pdf

Molecular conservation of estrogen-response associated with cell cycle regulation, hormonal carcinogenesis and cancer in zebrafish and human cancer cell lines

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