Transcriptional regulation of human CD5: important role of Ets transcription factors in CD5 expression in T cells

Mònica Arman, Javier Calvo, Maria E Trojanowska, Peter N Cockerill, Mónica Santana, Manuel López-Cabrera, Jordi Vives, Francisco Lozano

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


CD5 is a surface receptor constitutively expressed on thymocytes and mature T and B-1a cells. CD5 expression is tightly regulated during T and B cell development and activation processes. In this study we shown that the constitutive expression of CD5 on human T cells correlates with the presence of a DNase I-hypersensitive (DH) site at the 5'-flanking region of CD5. Human CD5 is a TATA-less gene for which 5'-RACE analysis shows multiple transcriptional start sites, the most frequent of which locates within an initiator sequence. Luciferase reporter assays indicate that a 282-bp region upstream of the initiation ATG displays full promoter activity in human T cells. Two conserved Ets-binding sites (at positions -239 and -185) were identified as functionally relevant to CD5 expression by site-directed mutagenesis, EMSAs, and cotransfection experiments. A possible contribution of Sp1 (-115 and -95), c-Myb (-177), and AP-1-like (-151) motifs was also detected. Further DH site analyses revealed an inducible DH site 10 kb upstream of the human CD5 gene in both T and B CD5(+) cells. Interestingly, a 140-bp sequence showing high homology with a murine inducible enhancer is found within that site. The data presented indicate that the 5'-flanking region of human CD5 is transcriptionally active in T cells, and that Ets transcription factors in conjunction with other regulatory elements are responsible for constitutive and tissue-specific CD5 expression.
Original languageEnglish
Pages (from-to)7519-29
Number of pages11
JournalJournal of Immunology
Issue number12
Publication statusPublished - 15 Jun 2004


  • 5' Flanking Region
  • Antigens, CD5
  • B-Lymphocytes
  • Binding Sites
  • Cell Line, Tumor
  • Deoxyribonuclease I
  • Gene Expression Regulation
  • Humans
  • Promoter Regions, Genetic
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-ets
  • T-Lymphocytes
  • Transcription Factors
  • Transcription Initiation Site
  • Transcription, Genetic


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