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. 1989 Jun 1;260(2):427–434. doi: 10.1042/bj2600427

Evidence that activation of a common G-protein by receptors for leukotriene B4 and N-formylmethionyl-leucyl-phenylalanine in HL-60 cells occurs by different mechanisms.

K R McLeish 1, P Gierschik 1, T Schepers 1, D Sidiropoulos 1, K H Jakobs 1
PMCID: PMC1138686  PMID: 2548477

Abstract

Differentiated HL-60 cells were found to respond to the chemoattractants leukotriene B4 (LTB4) and N-formylmethionyl-leucyl-phenylalanine (FMLP), in a manner similar to neutrophils. Membranes of myeloid differentiated HL-60 cells were used (a) to examine the ability of LTB4 receptors to interact with a guanine-nucleotide-binding protein (G-protein), and (b) to compare this G-protein with that which is coupled to the FMLP receptor. LTB4 stimulated a dose-dependent increase in GTP hydrolysis and guanosine 5'-[gamma-thio]triphosphate (GTP[S]) binding, demonstrating that LTB4 receptors on HL-60 cells are coupled to a G-protein. Both pertussis toxin and cholera toxin inhibited stimulation of GTPase activity and GTP[S] binding by either LTB4 or FMLP, indicating that both receptors are coupled to a G-protein containing a 40 kDa alpha-subunit. That the two receptors share a common G-protein was shown by FMLP enhancement of cholera-toxin-induced inhibition of GTPase activity stimulated by either FMLP or LTB4. However, LTB4 did not enhance cholera-toxin-induced inhibition of GTPase activity, suggesting that the receptors interacted differently with this G-protein. This difference was confirmed by showing that FMLP, but not LTB4, stimulated receptor-specific [32P]ADP-ribosylation of the 40 kDa alpha-subunit. Concentrations of LTB4 and FMLP which produced maximal responses produced enhanced stimulation in both assays. This additive effect was not abolished by inactivation of up to 80% of G-protein activity by N-ethylmaleimide or cholera toxin. We conclude that LTB4 and FMLP receptors in HL-60 cells are coupled to a common G-protein. The receptor--G-protein interaction is different for the two receptors, and G-proteins not coupled to both receptors may account for the additive response.

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