BACKGROUND: The 31-kilodalton beta-galactoside-binding protein galectin-3 has been associated with cellular transformation and metastasis. Because neural tissues contain large amounts of glycoconjugates, and endogenous carbohydrate-binding proteins have been described in the human brain, the authors examined the expression of galectin-3 in human brain tumors and metastases to the central nervous system. METHODS: Brain tumors were categorized by the World Health Organization system and galectin-3 expression by immunoperoxidase staining using a quantitative staining score. RESULTS: Glioblastomas (Grade 4 astrocytomas) all stained strongly for galectin-3, whereas low grade astrocytomas (Grade 2) did not express the endogenous lectin. Anaplastic astrocytomas (Grade 3) exhibited intermediate expression. The staining score was significantly associated with tumor grade (P < 0.001). Normal brain tissue and benign tumors did not express galectin-3, whereas metastases to the brain were all positive for galectin-3 expression. Metastases expressed significantly more galectin-3 than the primary tumors from which they were derived (P = 0.003). CONCLUSIONS: Galectin-3 expression correlates with the malignant potential of tumors in the central nervous system.
BACKGROUND: The 31-kilodalton beta-galactoside-binding protein galectin-3 has been associated with cellular transformation and metastasis. Because neural tissues contain large amounts of glycoconjugates, and endogenous carbohydrate-binding proteins have been described in the human brain, the authors examined the expression of galectin-3 in humanbrain tumors and metastases to the central nervous system. METHODS:Brain tumors were categorized by the World Health Organization system and galectin-3 expression by immunoperoxidase staining using a quantitative staining score. RESULTS:Glioblastomas (Grade 4 astrocytomas) all stained strongly for galectin-3, whereas low grade astrocytomas (Grade 2) did not express the endogenous lectin. Anaplastic astrocytomas (Grade 3) exhibited intermediate expression. The staining score was significantly associated with tumor grade (P < 0.001). Normal brain tissue and benign tumors did not express galectin-3, whereas metastases to the brain were all positive for galectin-3 expression. Metastases expressed significantly more galectin-3 than the primary tumors from which they were derived (P = 0.003). CONCLUSIONS:Galectin-3 expression correlates with the malignant potential of tumors in the central nervous system.
Authors: Yi Wang; Pratima Nangia-Makker; Larry Tait; Vitaly Balan; Victor Hogan; Kenneth J Pienta; Avraham Raz Journal: Am J Pathol Date: 2009-03-12 Impact factor: 4.307
Authors: Heather M McClung; Stacey L Thomas; Pamela Osenkowski; Marta Toth; Priya Menon; Avraham Raz; Rafael Fridman; Sandra A Rempel Journal: Neurosci Lett Date: 2007-04-21 Impact factor: 3.046