Cited by 25Protease and Inhibitor MechanismsGlioma Diagnosis and TreatmentBlood Coagulation and Thrombosis Mechanisms

Expression and cellular localization of low-density lipoprotein receptor-related protein/α2-macroglobulin receptor in human glioblastoma in vivoreceptor in human glioblastoma in vivo

Yamamoto, Masaaki, Ikeda, Kohichi, Ohshima, Kohichi, Tsugu, Hitoshi, Kimura, Hideo, Tomonaga, Masamichi·1998·Brain Tumor Pathology

Abstract

Low-density lipoprotein receptor-related protein/alpha 2-macroglobulin receptor (LRP) has been proposed to mediate the cellular uptake and clearance of inactivated protease-inhibitor complexes in regulating proteinase activity at the cell surface, which is necessary for cellular migration and invasive processes. In this study, we investigated the presence of both LRP and urokinase-type plasminogen activator receptor (uPAR) in glioblastoma by reverse transcriptase-polymerase chain reaction (RT-PCR), and the cellular localization of LRP in glioblastoma tissues by immunohistochemical analysis. LRP mRNA was frequently expressed in glioblastomas and anaplastic astrocytomas compared with low-grade astrocytomas by RT-PCR analysis, and was well correlated with uPAR expression. The immunohistochemistry of LRP on sequential frozen sections showed that neoplastic glial cells and endothelial cells of glioblastomas exhibited intense LRP immunoreactivity, whereas LRP was almost undetectable in low-grade astrocytomas or in normal glial cells and endothelial cells of normal brain tissue. Glioblastomas from 11 patients in which the expression of LRP mRNA was observed by PCR displayed strong to moderate LRP immunoreactivity, with predominantly diffuse cytoplasmic and cell-surface localization. In normal brain tissues, LRP immunoreactivity was identified in the pyramidal neurons of the cerebral cortex. These results indicate that LRP is present both in the cellular cytoplasm and on the cell surface of glioblastomas with an increased expression of uPAR. Altered LRP expression might contribute to the stimulation of cell-surface proteolytic activity that in turn facilitates the invasiveness of glioblastoma in vivo.

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Crossref · 10.1007/bf02482097

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Authors
Yamamoto, M., Ikeda, K., Ohshima, K., Tsugu, H., Kimura, H., & Tomonaga, M.
Affiliations
Fukuoka University (JP)
Corresponding author
Yamamoto, Masaaki
Venue
Brain Tumor Pathology
Published
1998-03
Volume
15
Issue
1
Pages
23-30
ISSN
  • 1433-7398 (ISSN-L)
  • 1861-387X
OpenAlex
W213787128
Cited by
25
References
44
Citations by year
2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2019: 1 · 2017: 1 · 2016: 1 · 2015: 1 · 2013: 1
FWCI
0.28
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Tumor Pathology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Fukuoka University
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
  • Health Sciences › Medicine › Genetics › Glioma Diagnosis and Treatment
  • Health Sciences › Medicine › Hematology › Blood Coagulation and Thrombosis Mechanisms
Keywords
low density lipoprotein receptor-related protein, alpha2-macroglobulin receptor, glioblastoma, urokinase-type plasminogen activator receptor, anaplastic astrocytoma, astrocytoma, protease-inhibitor complex, tumor invasion, endothelial cells, cortical neurons
MeSH terms
alpha-Macroglobulins, Brain, Brain Neoplasms, Glioblastoma, Humans, Immunohistochemistry, Neoplasm Invasiveness, Receptors, Cell Surface, Receptors, Immunologic, Receptors, LDL, RNA, Messenger, Urokinase-Type Plasminogen Activator, Reverse Transcriptase Polymerase Chain Reaction, Low Density Lipoprotein Receptor-Related Protein-1, Receptors, Urokinase Plasminogen Activator

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