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BZLF1 repression of transcription from the Epstein-Barr virus BC-R2 promoter (Cp) was shown to require a glucocorticoid response element in cis and glucocorticoids in trans. The mechanism of the repression is indirect and involves up regulation of the cellular c-fos proto-oncogene. Glucocorticoids maintain Epstein-Barr virus latency, and removal of glucocorticoids from the cell culture medium results in activation of the productive cycle. This inverse regulation of the expression of latent and productive cycle genes contributes to the switch between virus latency and the productive cycle. Glucocorticoid control of BC-R2 might also provide a mechanism for EBNA promoter switching during early infection and in development of the restricted latent pattern of gene expression.

Reciprocal antagonism of steroid hormones and BZLF1 in switch between Epstein-Barr virus latent and productive cycle gene expression