Abstract:
:Cyclins are important regulators of the cell cycle; there is increasing evidence that some cyclins are positively involved in carcinogenesis. Amplification and translocation of the cyclin genes and overexpression of their mRNAs and proteins have been observed in a variety of tumours. We studied cyclin A protein in astrocytic tumours by immunohistochemical analysis. Immunohistochemistry with microwave antigen retrieval was carried out on formalin fixed, paraffin embedded material from 15 glioblastomas (WHO grade IV), 10 anaplastic astrocytomas (WHO grade III), seven diffuse low grade astrocytomas (WHO grade II) and nine pilocytic astrocytomas (WHO grade I) using antibodies against cyclin A and a proliferation marker MIB1. Staining for these antibodies was seen mainly in the tumour cell nuclei; 66% of all cases showing staining for cyclin A and 95% of all cases staining for MIB1. Mean labelling indices (LI) for cyclin a were higher in glioblastoma (mean LI-6.7) and anaplastic astrocytoma (mean LI-5.9) than low grade diffuse astrocytoma (mean LI-1.7) and pilocytic astrocytoma (mean LI-0.12), although there was no clear cut off point between the various tumour types. A good correlation was seen between labelling indices of cyclin A and MIB1 (Pearson correlation coefficient r = 0.59, P < 0.0001). Cyclin A is variably expressed in astrocytic tumours, either reflecting increased tumour proliferation (cyclin A being an integral component of the cell cycle), an alteration of its gene, protein upregulation or regulation of apoptosis. The genetic basis of expression of cyclin A in astrocytic tumours remains to be determined.
journal_name
Neuropathol Appl Neurobioljournal_title
Neuropathology and applied neurobiologyauthors
Chakrabarty A,Bridges LRdoi
10.1046/j.1365-2990.1998.00114.xsubject
Has Abstractpub_date
1998-06-01 00:00:00pages
239-45issue
3eissn
0305-1846issn
1365-2990journal_volume
24pub_type
杂志文章abstract::The effects of exposure to a cytotoxic agent, methylazoxymethanol acetate (MAM Ac), on the distribution, density and quantitative morphology of microglia in the rat forebrain have been examined with the aid of a peroxidase-conjugated lectin derived from Griffonia simplicifolia. Following exposure to MAM Ac (25 mg/kg m...
journal_title:Neuropathology and applied neurobiology
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journal_title:Neuropathology and applied neurobiology
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journal_title:Neuropathology and applied neurobiology
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journal_title:Neuropathology and applied neurobiology
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doi:10.1111/j.1365-2990.1986.tb00677.x
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journal_title:Neuropathology and applied neurobiology
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