Peptidoleukotrienes: distinct receptors for leukotriene C4 and D4 in the guinea-pig lung

Biochem Biophys Res Commun. 1983 Nov 15;116(3):1136-43. doi: 10.1016/s0006-291x(83)80261-7.


Using [3H]-leukotriene C4 ([3H]-LTC4) and [3H]-leukotriene D4 ([3H]-LTD4), specific peptidoleukotriene receptors have been identified in membranes derived from guinea-pig lung. In the presence of 0.1 mM guanyl-5'-yl-imidodiphosphate, which completely inhibits [3H]-LTD4 binding, [3H]-LTC4 binding was protein- and temperature-dependent, reached equilibrium within 15 minutes at 20 degrees C and was reversible. Guanine nucleotides had no effect on the [3H]-LTC4 binding. Competition studies with [3H]-LTC4, peptidoleukotrienes C4, D4, E4 and the peptidoleukotriene antagonist FPL 55712 revealed an order of potency of leukotriene C4 much greater than E4 greater than D4 greater than FPL 55712. [3H]-LTD4 competition studies indicated an order of potency of LTD4 greater than LTE4 greater than LTC4 much greater than FPL 55712. Bioconversion of [3H]-LTC4, as determined by high performance liquid chromatography, was less than 3 percent. The data suggest the guinea-pig lung may contain biochemically distinct receptors for LTC4 and LTD4.

MeSH terms

  • Animals
  • Binding, Competitive
  • Biotransformation
  • Cell Membrane / metabolism
  • Guinea Pigs
  • Kinetics
  • Lung / metabolism*
  • Receptors, Cell Surface / metabolism*
  • Receptors, Leukotriene
  • SRS-A / metabolism*
  • Tritium


  • Receptors, Cell Surface
  • Receptors, Leukotriene
  • SRS-A
  • Tritium