title: Alteration of bcl-2 and bax expression in embolized meningiomas.
abstract: We examined the expression of the p53 and bcl-2 family in embolized meningiomas and investigated the interaction between them. p53 and its downstream effector p21 accumulated mainly in perinecrotic areas, where apoptosis was also observed. bcl-2 was often expressed in the areas distant from necrosis, whereas Bax was immunostained more intensely in the perinecrotic areas. Double staining for both p53 and Bcl-2 showed a reciprocal pattern. This appeared to be due to the down-regulation of Bcl-2 by p53. However, regulation of Bax by p53 was not distinct. The expression of p21 was not apparent 13 days after embolization, and apoptosis was observed until 6 days after embolization. The effect of embolization was most likely temporary, although growth arrest has been reported to persist for a long time in a limited number of embolized cases.
authors.affiliation: Department of Neurosurgery, Shiga University of Medical Science, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Nakasu
authors.forename: M
authors.initials: M
authors.lastname: Nakajima
authors.forename: T
authors.initials: T
authors.lastname: Nakazawa
authors.forename: Y
authors.initials: Y
authors.lastname: Nakasu
authors.forename: J
authors.initials: J
authors.lastname: Handa
mesh_terms: D000328:Adult; D000368:Aged; D017209:Apoptosis / Q000235:genetics / Q000502:physiology*; D015536:Down-Regulation; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008577:Meningeal Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D008579:Meningioma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D008875:Middle Aged; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis* / Q000235:genetics; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis* / Q000235:genetics; D016283:Proto-Oncogene Proteins p21(ras) / Q000096:biosynthesis / Q000235:genetics; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism; D051028:bcl-2-Associated X Protein
chemical_list: C494826:BAX protein, human; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; D051028:bcl-2-Associated X Protein; C501009:HRAS protein, human; D016283:Proto-Oncogene Proteins p21(ras)