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A 13-year-old boy with an anaplastic meningioma at the site of the jugular foramen had an increased serum level of aklaline phosphatase (ALPase) (liver form) in the serum before surgery. Immediately after excision of the tumor, the serum ALPase level decreased dramatically. Histochemical and
Histochemical analysis of frozen, thin sections revealed the distribution of alkaline phosphatase (ALPase) in 47 primary intracranial neoplasms in humans. The cytoplasm of meningioma cells exhibited the strongest ALPase reactivity. Pretreatment of these materials by levamisol indicated that the
Apart from defined histomorphologic features, increased Ki-67 indices and various numeric and structural chromosome aberrations, meningiomas of the intermediate (WHO grade II, atypical meningioma) and anaplastic type (WHO grade III) are cytogenetically distinguished from common-type meningiomas (WHO
The specific activity of alkaline phosphatase in cultured human meningioma cells varies over a relatively wide range. There is no correlation between the levels of activity and the histological type of meningioma from which the cultures were derived. The enzyme is heat-labile and is strongly
Brain-invasive growth of a subset of meningiomas is associated with less favorable prognosis. The molecular mechanisms causing invasiveness are only partially understood, however, the expression of matrix metalloproteinases (MMPs) has been identified as a contributing factor. We have previously
BACKGROUND
Cytogenetic studies in meningiomas show that 1p monosomy constitutes an important factor involved in their progression. Genes coding for unspecific alkaline phosphatase (AP-un) are located in this chromosome, in particular in 1p34-p36.1. This enzyme is widely distributed in the body and
Meningiomas are cytogenetically characterized by loss of one chromosome 22 as a typical primary aberration and progression-associated secondary chromosome changes, of which monosomy 1p is the most common. The aim of this study was to evaluate the significance of monosomy 1p and enzyme activity loss
DEP-1/PTPRJ is a transmembrane protein-tyrosine phosphatase which has been proposed as a suppressor of epithelial tumors. We have found loss of heterozygosity (LOH) of the PTPRJ gene and loss of DEP-1 protein expression in a subset of human meningiomas. RNAi-mediated suppression of DEP-1 in DEP-1
Meningiomas usually are benign intracranial tumors. However, some recur despite gross total resection, invade surrounding structures, or, rarely, metastasize. Reduced expression of the nonspecific tissue-type alkaline phosphatase (Pal) has been reported in high-grade meningiomas. To search for a
Atypical and anaplastic meningiomas (AAM) represent 20% of all meningiomas. They are associated with poor outcomes due to their tendency to recur. While surgery and radiation (RT) are first line therapy, no effective systemic medical treatment has been identified. Protein phosphatase 2A (PP2A) is a