B7-H1 expression is regulated by MEK/ERK signaling pathway in anaplastic large cell lymphoma and Hodgkin lymphoma

Cancer Sci. 2009 Nov;100(11):2093-100. doi: 10.1111/j.1349-7006.2009.01302.x. Epub 2009 Aug 1.


B7-H1 is a member of the B7 family that inhibits the function of T-cells through its receptor programmed death-1 (PD-1). We examined B7-H1 expression in anaplastic large cell lymphoma (ALCL) and Hodgkin lymphoma (HL) and found that it was constitutively expressed in both clinical samples and cell lines. In anaplastic lymphoma kinase-positive (ALK(+)) ALCL cells, B7-H1 expression was suppressed by the blocking of extracellular signal-regulated kinase (ERK) signaling and upregulated by the augmentation of ERK activity by phorbol 13-myristate 12-acetate stimulation, suggesting that B7-H1 expression is regulated by ERK signaling pathway in ALCL. ERK is one of the downstream mediators of nucleophosmin (NPM)/ALK signaling in ALK(+)ALCL, and pharmacological inhibition of ALK was shown to dephosphorylate ERK and down-regulate B7-H1. The involvement of NPM/ALK in B7-H1 expression was also demonstrated by introducing the construct into human non-ALCL lymphoid cell lines, which resulted in B7-H1 expression. In the case of HL, B7-H1 expression was shown to be dependent on the ERK and p38 mitogen-activated protein kinase (MAPK) signaling pathways. These results suggest that B7-H1 expression is controlled by common ERK signaling pathways in ALCL and HL cells. Our findings provide a potentially effective immunotherapeutic strategy for these B7-H1-expressing tumors.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, CD / analysis*
  • Antigens, CD / physiology
  • B7-H1 Antigen
  • Cell Line, Tumor
  • Extracellular Signal-Regulated MAP Kinases / physiology*
  • Hodgkin Disease / metabolism*
  • Humans
  • Lymphoma, Large-Cell, Anaplastic / metabolism*
  • MAP Kinase Signaling System / physiology*
  • Mitogen-Activated Protein Kinase Kinases / physiology*
  • Protein-Tyrosine Kinases / physiology
  • STAT3 Transcription Factor / physiology


  • Antigens, CD
  • B7-H1 Antigen
  • CD274 protein, human
  • STAT3 Transcription Factor
  • STAT3 protein, human
  • p80(NPM-ALK) protein
  • Protein-Tyrosine Kinases
  • Extracellular Signal-Regulated MAP Kinases
  • Mitogen-Activated Protein Kinase Kinases