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. 1995 Aug;96(2):915–922. doi: 10.1172/JCI118139

Tumor necrosis factor-alpha modulates monocyte/macrophage apoprotein E gene expression.

H Duan 1, Z Li 1, T Mazzone 1
PMCID: PMC185279  PMID: 7635986

Abstract

apo E has been shown to modulate cholesterol balance in arterial wall cells. Production of apo E by macrophages in atherosclerotic plaques could thereby influence the development of the plaque lesion. Cytokines, including TNF alpha, have been identified in human lesions, therefore, we undertook a series of studies to evaluate the effect of TNF alpha on monocyte/macrophage apo E production. The addition of TNF alpha to freshly isolated human monocytes led to a four- to fivefold increase of apo E mRNA abundance. The addition of TNF alpha to fully differentiated macrophages either had no effect or modestly inhibited apo E mRNA expression. THP1 human monocytic cells also responded to TNF alpha in a phenotype-specific manner. Treatment of these cells with TNF alpha produced a dose- and time-dependent increase in apo E mRNA. This increase was reflected in apo E synthesis and was associated with inhibition of DNA synthesis, and with induction of c-fos and ICAM-1 gene expression. Cell-permanent analogues of ceramide did not reproduce TNF alpha effect on apo E, but antagonists of protein kinase C did inhibit its effect. TNF alpha induction of apo E mRNA abundance was associated with stimulation of apo E promoter-dependent gene transcription. In summary, TNF alpha stimulates apo E gene transcription, mRNA abundance, and protein synthesis in the monocyte/macrophage in a phenotype-specific manner. Such regulation could significantly modify the amount of apo E present in vessel wall lesions.

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Selected References

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