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C/EBPalpha and C/EBPbeta are persistently associated with the rat liver nuclear matrix throughout development and the

S Dinic¹, S Ivanovic-Matic, D Bogojevic

¹Molecular Biology Laboratory, Institute for Biological Research, 29. Novembra 142, Belgrade, Serbia, 11060, Federal Republic of Yugoslavia.

Cell Biology International

|October 12, 2000

Abstract:

The partitioning of C/EBPalpha and C/EBPbeta on the nuclear matrix structure was examined during the different transcriptional activities accompanying liver development and the acute phase (AP) response. The presence of C/EBPalpha and C/EBPbeta was established on the nuclear matrix. Their relative concentrations on the matrix always reflected the developmental stage- and AP-related fluctuations observed in the nuclear extract. Thus, they progressively increased as development proceeded, whereas during the AP response, C/EBPalpha decreased and C/EBPbeta increased. In addition, the levels of both transcription factors were always notably higher in the nuclear matrix than in the extracts. We conclude that the observed changes and overall enrichment of the nuclear matrix with regulatory proteins is a reflection of the importance of such interactions for the in vivo functioning of C/EBP proteins.

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...

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