The retinoblastoma protein modulates expression of genes coding for diverse classes of proteins including components of the extracellular matrix.

Abstract:

:The product of the retinoblastoma susceptibility gene, pRb, is a negative regulator of cell growth. It functions by regulating the activity of transcription factors. Rb represses some genes by sequestering or inactivating the positive transcription factor E2F and seems to activate some others by interacting with factors like Sp1 or ATF-2. However, there are only a few examples of genes which are positively regulated by pRb. In order to find out if there are common mechanisms for promoter regulation by pRb, we were interested to identify more genes which are either stimulated or repressed by pRb. Using the method of differential display (DDRT-PCR) in combination with nuclear run-on analyses we were able to detect a number of genes which are upregulated by ectopic expression of the Rb gene in Rb-deficient mammary carcinoma cells. We could demonstrate not only stimulation of the endogenous mutant Rb gene but also positive regulation of genes coding for diverse classes of proteins, including the endothelial growth regulator endothelin-1 and the proteoglycans versican and PG40. As a second approach, we investigated gene expression in cell lines established from Rb deficient heterozygous and homozygous knockout mouse embryos and normal mice. We have identified several genes the expression of which correlates positively or negatively with the presence of Rb. These data provide further evidence for pRb being a master regulator of a complex network of gene activities defining the difference between dividing and resting or differentiated cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Rohde M,Warthoe P,Gjetting T,Lukas J,Bartek J,Strauss M

subject

Has Abstract

pub_date

1996-06-06 00:00:00

pages

2393-401

issue

11

eissn

0950-9232

issn

1476-5594

journal_volume

12

pub_type

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