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Cancer 2004 Sep 1;101(5):1036-42

Analysis of interleukin-13 receptor alpha2 expression in human pediatric brain tumors.

Kawakami M, Kawakami K, Takahashi S, Abe M, Puri RK

Puri RK, US FDA, Ctr Biol Evaluat & Res, Div Cellular & Gene Therapies, Lab Mol Tumor Biol, NIH Bldg 29B,Room 2NN10,HFM-735, Bethesda, MD 20892 USA US FDA, Ctr Biol Evaluat & Res, Div Cellular & Gene Therapies, Lab Mol Tumor Biol, Bethesda, MD 20892 USA Nagoya City Univ, Grad Sch Med Sci, Dept Expt Pathol & Tumor Biol, Aichi, Japan Fujita Hlth Univ, Sch Med, Dept Surg Pathol, Aichi, Japan

Abstract

BACKGROUND: Compared with normal brain tissue cells, human malignant glioma cells express higher levels of interleukin-13 receptor (IL-13R). However, whether this receptor is expressed in situ has not been carefully examined. With IL-13R-targeted cytotoxin (IL13-PE38QQR, comprising IL-13 and a mutated form of Pseudomonas exotoxin [PE]) being tested in three Phase I/II clinical trials for the treatment of adult human glioma, and with pediatric studies being planned, the authors set out to analyze pediatric brain tumor tissue specimens for the expression of IL-13R. METHODS: Using in situ hybridization and immunohistochemical staining, the authors examined 58 pediatric brain tumor specimens for expression of the predominant IL-13 binding and internalizing protein (IL-13Ralpha2) chain at the mRNA and protein levels. RESULTS: Overall, approximately 83% of pediatric brain tumor samples expressed IL-13Ralpha2. One hundred percent (11 of 11) high-grade astrocytoma, 79% (26 of 33) low-grade astrocytoma, 67% (4 of 6) medulloblastoma, and 67% (2 of 3) ependymoma samples were positive for IL-13Ralpha2. Among IL-13Ralpha2-positive samples, 88% (42 of 48 samples) had positive expression in >/= 50% of all tumor fields. The results obtained using both assays were consistent with each other. CONCLUSIONS: The current study established that pediatric brain tumor specimens expressed the IL-13Ralpha2 chain. Because the IL-13Ralpha2 chain is a major binding component of the IL-13R complex, these results suggest that the targeting of IL-13R may represent a useful approach for the treatment of pediatric brain tumors. Cancer 2004. Published 2004 by the American Cancer Society.


Category: Journal Article, Peer
PubMed ID: #15329913
Includes FDA Authors from Scientific Area(s): Biologics
Entry Created: 2011-10-04 Entry Last Modified: 2012-08-29
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