Abstract:
:The nuclear Ki-67 protein (pKi-67) has previously been shown to be exclusively expressed in proliferating cells. As a result, antibodies against this protein are widely used as prognostic tools in cancer diagnostics. Here we show, that despite the strong downregulation of pKi-67 expression in non-proliferating cells, the protein can nevertheless be detected at sites linked to ribosomal RNA (rRNA) synthesis. Although this finding does not argue against the use of pKi-67 as a proliferation marker, it has wide ranging implications for the elucidation of pKi-67 function. Employing the novel antibody TuBB-9, we could further demonstrate that also in proliferating cells, a fraction of pKi-67 is found at sites linked to the rRNA transcription machinery during interphase and mitosis. Moreover, chromatin immunoprecipitation (ChIP) assays provided evidence for a physical association of pKi-67 with chromatin of the promoter and transcribed region of the rRNA gene cluster. These data strongly suggest a role for pKi-67 in the early steps of rRNA synthesis.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Bullwinkel J,Baron-Lühr B,Lüdemann A,Wohlenberg C,Gerdes J,Scholzen Tdoi
10.1002/jcp.20494keywords:
subject
Has Abstractpub_date
2006-03-01 00:00:00pages
624-35issue
3eissn
0021-9541issn
1097-4652journal_volume
206pub_type
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