Pertussis but not cholera toxin inhibits the stimulated increase in actin association with the cytoskeleton in rabbit neutrophils: role of the "G proteins" in stimulus-response coupling.
Treatment of rabbit neutrophils with pertussis toxin, but not cholera toxin, inhibits the increases produced by formylmethionyl-leucyl-phenylalanine, leukotriene B4 and the calcium ionophore A23187 in the amounts of actin associated with the cytoskeletons. The increase in the cytoskeletal actin produced by phorbol 12-myristate, 13-acetate on the other hand is not affected by pertussis toxin. Incubation of the neutrophils with cholera toxin, unlike pertussis toxin, did not inhibit the fMet-Leu-Phe induced rise in the intracellular concentration of free calcium, and caused only a shift to the right of the dose-response curve of N-acetyl-beta-glucosaminidase release. This shift was more marked in the presence of 1-methyl-3-isobutylxanthine. In addition, the stimulated breakdown of phosphatidylinositol 4,5 bis-phosphate was inhibited by pertussis toxin. These results suggest that pertussis toxin acts at an early step in the signal transduction and does not affect the sequence of reactions initiated by the activation of the protein kinase C. Furthermore, the guanine nucleotide regulatory protein Gi, but not Gs, is closely involved in signal transduction in these cells.
Shefcyk
J
J
Yassin
R
R
Volpi
M
M
Molski
T F
TF
Naccache
P H
PH
Munoz
J J
JJ
Becker
E L
EL
Feinstein
M B
MB
Sha'afi
R I
RI
D000199:Actins / Q000097:blood*; D000818:Animals; D001427:Bacterial Toxins / Q000494:pharmacology*; D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000097:blood; D002772:Cholera Toxin / Q000494:pharmacology*; D003599:Cytoskeleton / Q000187:drug effects / Q000378:metabolism*; D019204:GTP-Binding Proteins / Q000097:blood*; D066298:In Vitro Techniques; D007975:Leukotriene B4 / Q000494:pharmacology; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects* / Q000378:metabolism; D037342:Pertussis Toxin; D011485:Protein Binding / Q000187:drug effects; D011817:Rabbits; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D010566:Virulence Factors, Bordetella
D000199:Actins; D001427:Bacterial Toxins; D010566:Virulence Factors, Bordetella; D007975:Leukotriene B4; D000001:Calcimycin; D009240:N-Formylmethionine Leucyl-Phenylalanine; D002772:Cholera Toxin; D037342:Pertussis Toxin; D019204:GTP-Binding Proteins; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium