Abstract
We have previously characterized three human leucine-rich repeats and immunoglobulin-like domains (LRIG) genes and proteins, named LRIG1-3 and proposed that they may act as suppressors of tumor growth. The LRIG1 transmembrane protein antagonizes the activity of epidermal growth factor receptor family receptor tyrosine kinases. In this study, we evaluated the mRNA expression level of LRIG1-3 in human glioma cell lines and control-matched glioma tissues, characterized the sub-cellular localization of an LRIG3–GFP fusion protein, and analyzed the relationship between sub-cellular localization of LRIG1-3 and clinical parameters in 404 astrocytic tumors by immunohistochemistry. LRIG1-3 mRNA was detected in all human glioma cell lines and matched glioma samples, with large differences in the expression levels. Ectopically expressed LRIG3–GFP localized to perinuclear and cytoplasmic compartments, and to the cell surface of transfected glioma cells. Perinuclear staining of LRIG1-3 was associated with low WHO grade and better survival of the patients. Perinuclear staining of LRIG3 was associated with a lower proliferation index and was in addition to tumor grade, an independent prognostic factor. Furthermore, within the groups of grade III and grade IV tumors, perinuclear staining of LRIG3 significantly correlated with better survival. These results indicate that expression and sub-cellular localization of LRIG1-3 might be of importance in the pathogenesis and prognosis of astrocytic tumors.
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Acknowledgements
This study was supported by grants from The National Cancer Foundation and Lion’s Cancer Research Foundation, Umeå University, Sweden. Kerstin Bergh is acknowledged for her excellent assistance with the immunohistochemical staining. We also thank Björn Tavelin for statistical advice.
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Guo, D., Nilsson, J., Haapasalo, H. et al. Perinuclear leucine-rich repeats and immunoglobulin-like domain proteins (LRIG1-3) as prognostic indicators in astrocytic tumors. Acta Neuropathol 111, 238–246 (2006). https://doi.org/10.1007/s00401-006-0032-5
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DOI: https://doi.org/10.1007/s00401-006-0032-5