BLT1 and BLT2: the leukotriene B(4) receptors

Prostaglandins Leukot Essent Fatty Acids. 2003 Aug-Sep;69(2-3):123-34. doi: 10.1016/s0952-3278(03)00073-5.


Two receptors for leukotriene B(4) (LTB(4)) have been molecularly identified: BLT1 and BLT2. Both receptors are G protein-coupled seven transmembrane domain receptors, whose genes are located in very close proximity to each other in the human and mouse genomes. The two receptors differ in their affinity and specificity for LTB(4): BLT1 is a high-affinity receptor specific for LTB(4), whereas BLT2 is a low-affinity receptor that also binds other eicosanoids. The two receptors also differ in their pattern of expression with BLT1 being expressed primarily in leukocytes, whereas BLT2 is expressed more ubiquitously. By mediating the activities of LTB(4), these receptors participate both in host immune responses and in the pathogenesis of inflammatory diseases. Reduced disease severity in animal inflammatory models seen with LTB(4) receptor antagonists and in mice with targeted deletion of BLT1 have revealed important roles for LTB(4) and its receptors in regulating pathologic inflammation.

Publication types

  • Comparative Study
  • Research Support, U.S. Gov't, P.H.S.
  • Review

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Cell Line
  • Cloning, Molecular
  • GTP-Binding Proteins / metabolism
  • Gene Expression Regulation
  • Humans
  • Inflammation / etiology
  • Inflammation / prevention & control
  • Leukotriene B4 / metabolism
  • Ligands
  • Mice
  • Molecular Sequence Data
  • Neutrophils / metabolism
  • Purinergic P2 Receptor Antagonists
  • Receptors, Leukotriene B4 / antagonists & inhibitors
  • Receptors, Leukotriene B4 / genetics
  • Receptors, Leukotriene B4 / metabolism*
  • Receptors, Purinergic P2 / genetics
  • Receptors, Purinergic P2 / metabolism
  • Sequence Alignment


  • LTB4R protein, human
  • LTB4R2 protein, human
  • Ligands
  • Ltb4r1 protein, mouse
  • Ltb4r2 protein, mouse
  • Purinergic P2 Receptor Antagonists
  • Receptors, Leukotriene B4
  • Receptors, Purinergic P2
  • Leukotriene B4
  • GTP-Binding Proteins