Abstract
The GATA transcription factors consist of six family members, which bind to the consensus DNA-binding element, W- GATA-R, and are poorly characterized in the central nervous system (CNS). Using retroviral gene trapping on transgenic mouse glioma models, we identified GATA6 to be a novel tumor suppressor gene in glioblastoma multiforme. We now show GATA4, a family member of GATA6, to be expressed in the neurons and glia of normal murine and human embryonic and adult CNS. Silencing GATA4 in normal astrocytes did not alter their growth properties. In contrast, knockdown of Gata4 in p53 null non-transformed murine astrocytes induced transformation, with increased proliferation and resistance to chemotherapy or radiation-induced apoptosis. Furthermore, GATA4 expression was lost in a panel of human malignant astrocytoma cell lines. GATA4 overexpression in normal human and murine astrocytes resulted in a cell cycle block in G1 phase, with increased apoptosis. Mechanistically, GATA4 was a transcriptional inducer of the cyclin-dependent kinase inhibitor, p15INK4B, leading to the attenuation of cyclin D1. GATA4 expression was also induced by transforming growth factor-β, leading to the inhibition of astrocyte proliferation. Collectively, we show that GATA4 is expressed in the embryonic and adult CNS and acts as a negative regulator of astrocyte proliferation and growth.
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Abbreviations
- CNS:
-
central nervous system
- IHC:
-
immunohistochemistry
- NHA:
-
normal human astrocytes
- NMA:
-
normal murine astrocytes
- IF:
-
immunofluoresence cytochemistry
- GBM:
-
glioblastoma multiforme
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Acknowledgements
SA was supported by a RESTRACOMP studentship award from the Hospital for Sick Children and an Ontario Institute of Cancer Research award. Thanks to Dr Deepak Kamnasaran for technical advice and Jing Ma for technical assistance on IHC. AG was funded for this study by the National Cancer Institute of Canada, Brain Tumor Society and National Brain Tumor Foundation.
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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc)
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Agnihotri, S., Wolf, A., Picard, D. et al. GATA4 is a regulator of astrocyte cell proliferation and apoptosis in the human and murine central nervous system. Oncogene 28, 3033–3046 (2009). https://doi.org/10.1038/onc.2009.159
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DOI: https://doi.org/10.1038/onc.2009.159
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