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J Cell Commun Signal. 2019 Mar;13(1):75-84. doi: 10.1007/s12079-018-0476-0. Epub 2018 Jul 5.

Immunohistochemistry analysis of Pygo2 expression in central nervous system tumors.

Author information

1
Laboratory Medicine College, Guangdong Medical University, Guangdong, People's Republic of China.
2
Department of Neurological Surgery, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
3
State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
4
Department of Neurosurgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei, People's Republic of China.
5
Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, People's Republic of China.
6
Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, People's Republic of China. gjde@icmm.ac.cn.

Abstract

Pygo2 as a Wnt signaling pathway component has been detected in multiple cancer types. In this study, we identified Pygo2 expression features by immunohistochemistry in 73 central nervous system tumor specimens, in comparison with 14 normal brain tissues and surrounding non-tumorous tissues of tumor. Our study indicated that 59% of the patient tumor specimens exhibited positive Pygo2-staining and increases intensity with the grade of malignancy, especially for WHO grade III and IV gliomas, was observed high level expression, compared with normal brain tissues. Five out of nine WHO grade III anaplastic astrocytomas and seven out of nine WHO grade IV glioblastomas showed Pygo2-positive staining. The analysis of Pygo2 gene expression by quantitative real-time PCR of additional ten fresh patient samples yielded similar results. Further studies performed with stable cell lines in vitro demonstrated that Pygo2 render cells higher proliferation rate, migration and anchorage-independent colony-forming ability in soft agar. Taken together, our studies suggest an important role of Pygo2 in brain tumor progression.

KEYWORDS:

Glioblastomas; Gliomas; Immunohistochemistry; Pygo2

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