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- W2184428554 abstract "During the physiological process of PCD, the cell initiates a sequence of events culminating in the disintegration of the cell into small, membrane-bound apoptotic bodies. The intrinsic part of the PCD program arises from the mitochondria when it releases cytochrome c from the mitochondrial intermembrane space into the cytosol, forming the caspase-activating complex or apoptosome. The family of caspases is involved in the execution of genetically controlled PCD. Caspase-3 is expressed in normal and neoplastically transformed human cells and, like other caspases, is synthesized as an inactive, 32kDa proenzyme. Caspase-6 cleaves nuclear mitotic apparatus protein (NuMA) and mediates the shrinkage and fragmentation of cell nuclei. Caspase-8 is an initiation caspase that activates the caspase cascade during apoptosis, while caspase-9 is the initiator caspase in the caspase cascade in apoptotic normal and neoplastically transformed cells. During our immunocytochemical study, a sensitive, four-step, alkaline phosphatase conjugated antigen detection technique was employed. The results did in fact demonstrate the presence of high apoptotic activity within the cellular microenvironment of high-grade astrocytomas and glioblastomas. The observations identified cytoplasmic expression of caspase-3 and caspase-6 in more than 50 per cent of tumor cells, caspase-8 and caspase-9 in more than 10 per cent of tumor cells in high-grade anaplastic ASTR and glioblastoma. The immunocytochemical expression pattern in about 10 per cent of the tumor cells for caspase-3 and caspase-6 and about 1 to 5 per cent of the tumor cells for caspase-8 and caspase-9 demonstrated a translocation tendency from the cytoplasm to the cell nuclei in the apoptotic cells. This phenomenon may play an important role in these tumors' maintenance of immune privilege and evasion of immune attacks. We suggest that caspase-3, -6, -8 and -9 immunocytochemistry could have prognostic and immunotherapeutic significance in the treatment of these highly malignant glial tumors." @default.
- W2184428554 created "2016-06-24" @default.
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- W2184428554 date "2004-11-05" @default.
- W2184428554 modified "2023-09-23" @default.
- W2184428554 title "Immunocytochemical detection of members of the caspase cascade of apoptosis in high-grade astrocytomas." @default.
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