title: Differential expression of cysteinyl leukotriene receptor 1 and 15-lipoxygenase-1 in non-Hodgkin lymphomas.
abstract: BACKGROUND
  Arachidonic acid metabolites have been suggested to play an important role in carcinogenesis. We have recently reported that the cysteinyl leukotriene receptor 1 (CysLT1) and 15-lipoxygenase-1 (15-LO-1) are expressed by the malignant Hodgkin Reed-Sternberg cells of Hodgkin lymphoma and certain Hodgkin lymphoma cell lines, and that these cells convert arachidonic acid to the novel proinflammatory eoxins.
  
  
  METHODS
  The expression of the CysLT1 receptor and 15-LO-1 was investigated in a broad range of non-Hodgkin lymphomas (NHLs) by immunohistochemistry. The functionality of the CysLT1 receptor in primary mediastinal B-cell lymphoma (PMBCL) cell lines was studied by calcium mobilization assays.
  
  
  RESULTS
  Primary mediastinal B-cell lymphoma was the only NHL entity showing tumor cells positive for the CysLT1 receptor (9 of 10 tumors), and the PMBCL cell line Med-B1 expressed functional CysLT1 receptors, responding with a robust calcium signal upon cysteinyl leukotriene challenge. Furthermore, the tumor cells in 1 of 4 T-cell-derived anaplastic large-cell lymphomas, in contrast to all other studied NHLs, strongly expressed 15-LO-1.
  
  
  CONCLUSIONS
  Among the NHL entities included in this study, the CysLT1 receptor was exclusively expressed by the tumor cells of PMBCL. Thus, this further corroborates the pathologic overlap between PMBCL and classical Hodgkin lymphoma.
authors.affiliation: Department of Medicine, Division of Hematology, Karolinska University Hospital Solna and Karolinska Institutet, Stockholm, Sweden. fschain@beckham.com
authors.forename: Frida
authors.initials: F
authors.lastname: Schain
authors.forename: Daniel
authors.initials: D
authors.lastname: Schain
authors.forename: Yilmaz
authors.initials: Y
authors.lastname: Mahshid
authors.forename: Cheng
authors.initials: C
authors.lastname: Liu
authors.forename: Anna
authors.initials: A
authors.lastname: Porwit
authors.forename: Dawei
authors.initials: D
authors.lastname: Xu
authors.forename: Hans-Erik
authors.initials: HE
authors.lastname: Claesson
authors.forename: Christer
authors.initials: C
authors.lastname: Sundström
authors.forename: Magnus
authors.initials: M
authors.lastname: Björkholm
authors.forename: Jan
authors.initials: J
authors.lastname: Sjöberg
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001093:Arachidonate 15-Lipoxygenase / Q000378:metabolism*; D001706:Biopsy; D002118:Calcium / Q000378:metabolism; D045744:Cell Line, Tumor; D002648:Child; D002675:Child, Preschool; D005260:Female; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D017998:Leukotriene D4 / Q000494:pharmacology; D008228:Lymphoma, Non-Hodgkin / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D018077:Receptors, Leukotriene / Q000378:metabolism*
chemical_list: D018077:Receptors, Leukotriene; D017998:Leukotriene D4; D001093:Arachidonate 15-Lipoxygenase; C083169:leukotriene D4 receptor; D002118:Calcium