Nuclear Factor κB Activates Proenkephalin Transcription in T Lymphocytes

Amir Rattner, Mira Korner, Haim Rosen, Patrick A. Baeuerle, Yoav Citri

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Upon activation, T lymphocytes accumulate high levels of the neuropeptide enkephalin which correlate with high levels of proenkephalin mRNA in the cells. Here we investigated the transcriptional basis for these changes. The proenkephalin promoter contains a sequence GGGGACGTCCCC, named B2, which is similar to the κB sequence GGGGACTTTCC, the binding site of the transcription factor nuclear factor (NF)-κB. Activation of T lymphocytes induces an NF-κB-like binding activity to the B2 site, concomitant with activation of the proenkephalin promoter. Mutations at the B2 site abolish this transcriptional activation. The purified homodimer (two p50s) of the DNA-binding subunit of NF-κB binds the B2 site of proenkephalin relatively better than does the heterotetramer (two p65s plus two p50s) form of the factor. Thus, it appears that the T-cell-specific activation of the proenkephalin promoter is mediated by NF-κB. However, as NF-κB is ubiquitous and the transcriptional activation through the B2 site is T cell specific, yet another T-cell-specific factor which synergizes with NF-κB should be considered.

Original languageEnglish (US)
Pages (from-to)1017-1022
Number of pages6
JournalMolecular and cellular biology
Issue number2
StatePublished - Feb 1991
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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