PMID: 9443082Jan 27, 1998Paper

Relationship between alkaline phosphatase levels, osteopontin expression, and mineralization in differentiating MC3T3-E1 osteoblasts

Journal of Cellular Biochemistry
G R BeckB Zerler

Abstract

We are using viral oncogene probes to study the pathways by which osteoblast-specific gene expression is induced in ascorbic acid-treated MC3T3-E1 cells. The 12S product of the adenovirus E1A gene binds directly to key cellular regulators and, as a result, represses tissue specific gene expression and blocks differentiation in a wide variety of cell types. The main cellular targets of the E1A 12S product are the pRB family and p300/CBP family. The p300 family appears to be the primary target for E1A-mediated repression of tissue-specific gene expression in a variety of cell types. We have generated MC3T3-E1 cell lines that stably express either the wild-type 12S product or a mutant that targets p300/CBP, but not the pRB family. Using these constructs to dissect osteoblast differentiation, we found that targeting of p300/CBP appears to be sufficient to repress alkaline phosphatase expression, although a low but functional level of expression can be maintained if the pRB family is not targeted as well. Induction of alkaline phosphatase expression and activity can be dissociated from expression of late-stage markers such as osteocalcin and osteopontin. Surprisingly, cell lines exhibiting severe repression of alkaline phosphatase a...Continue Reading

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