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Effects of TGFβ1 on gene expression in the HP75 human pituitary tumor cell line identified by gene expression profiling

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Abstract

The pathogenesis of pituitary adenomas and many of the genes influencing growth of these tumors are unknown. TGFβ is known to inhibit proliferation of cultured anterior pituitary cells and anterior pituitary tumors, but the signal transduction pathways involved in the inhibition of growth are unclear. We treated the human HP75 pituitary cell line with 10−9 M TGFβ1 for 4, 24, and 96 h and performed global gene expression profiling by Affymetrix GeneChip microarray analysis. Quantitative PCR validation of specific genes involved in the TGFβ1-induced regulation of pituitary cell growth was also done. Of the 15,000 genes queried, there were 37 genes up-regulated and 48 genes down-regulated twofold or more after 4 h of TGFβ1 treatment. There were 121 genes up-regulated and 109 genes down-regulated twofold or more after 24 h of TGFβ1 treatment and 112 genes up-regulated and 43 genes down-regulated twofold or more after 96 h of TGFβ1 treatment. Galectin-3 (Gal-3) protein was decreased by TGFβ1 treatment and several genes which interacted with Gal-3 including RUNX1 and WNT5B were up-regulated after TGFβ1 treatment. SOX4 was also up-regulated by TGFβ1 treatment. SMAD3, which is directly involved in the TGFβ signal transduction pathway, was down-regulated by TGFβ1 treatment. These findings highlight the diverse gene networks and pathways through which TGFβ operates in its effects on pituitary tumor cells.

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Acknowledgments

We would like to express our thanks to the National Pituitary Agency for the pituitary antibodies. This was also supported, in part, by grant NIH CA 90249.

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Authors and Affiliations

  1. Department of Laboratory Medicine and Pathology, Mayo Clinic, 200 First Street, SW, Rochester, MN, 55905, USA

    Katharina H. Ruebel, Yoshinori Tanizaki, Long Jin, Gail A. Stilling, Shuya Zhang, Kendra Coonse, Bernd W. Scheithauer & Ricardo V. Lloyd

  2. Department of Bioinformatics, Mayo Clinic College of Medicine, Rochester, MN, USA

    Alexey A. Leontovich

  3. Department of Anatomy and AP, Faculty of Veterinary Sciences, University of Santiago de Compostela, Lugo, Spain

    Matilde Lombardero

  4. St. Michael’s Hospital, University of Toronto, Toronto, ON, Canada

    Kalman Kovacs

Authors
  1. Katharina H. Ruebel
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  2. Alexey A. Leontovich
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  3. Yoshinori Tanizaki
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  4. Long Jin
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  5. Gail A. Stilling
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  7. Kendra Coonse
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  8. Bernd W. Scheithauer
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  9. Matilde Lombardero
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  10. Kalman Kovacs
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  11. Ricardo V. Lloyd
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Correspondence to Ricardo V. Lloyd.

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Ruebel, K.H., Leontovich, A.A., Tanizaki, Y. et al. Effects of TGFβ1 on gene expression in the HP75 human pituitary tumor cell line identified by gene expression profiling. Endocr 33, 62–76 (2008). https://doi.org/10.1007/s12020-008-9060-3

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  • DOI: https://doi.org/10.1007/s12020-008-9060-3

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