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Molecular and Cellular Biology, December 1998, p. 7130-7138, Vol. 18, No. 12
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Neutrophils Stimulated with a Variety of Chemoattractants Exhibit Rapid Activation of p21-Activated Kinases (Paks): Separate Signals Are Required for Activation and Inactivation of Paks

RiYun Huang,1 Jian P. Lian,2 Dwight Robinson,1 and John A. Badwey2,3,*

Arthritis Unit, Massachusetts General Hospital,1 Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School,3 and Boston Biomedical Research Institute,2 Boston, Massachusetts 02114

Received 25 June 1998/Returned for modification 21 July 1998/Accepted 14 September 1998

Activation of the p21-activated protein kinases (Paks) was compared in neutrophils stimulated with a wide variety of agonists that bind to receptors coupled to heterotrimeric G proteins. Neutrophils stimulated with sulfatide, a ligand for the L-selectin receptor, or the chemoattractant fMet-Leu-Phe (fMLP), platelet-activating factor, leukotriene B4, interleukin-8, or the chemokine RANTES exhibited a rapid and transient activation of the 63- and 69-kDa Paks. These kinases exhibited maximal activation with each of these agonists within 15 s followed by significant inactivation at 3 min. In contrast, neutrophils treated with the chemoattractant and anaphylatoxin C5a exhibited a prolonged activation (>15 min) of these Paks even though the receptor for this ligand may activate the same overall population of complex G proteins as the fMLP receptor. Addition of fMLP to neutrophils already stimulated with C5a resulted in the inactivation of the 63- and 69-kDa Paks. Optimal activation of Paks could be observed at concentrations of these agonists that elicited only shape changes and chemotaxis in neutrophils. While all of the agonists listed above triggered quantitatively similar activation of the 63- and 69-kDa Paks, fMLP was far superior to the other stimuli in triggering activation of the c-Jun N-terminal kinase (JNK) and the p38 mitogen-activated protein kinase (MAPK). These data indicate that separate signals are required for activation and inactivation of Paks and that, in contrast to other cell types, activated Pak does not trigger activation of JNK or p38-MAPK in neutrophils. These results are consistent with the recent hypothesis that G-protein-coupled receptors may initiate signals independent of those transmitted by the alpha  and beta gamma subunits of complex G proteins.

* Corresponding author. Mailing address: Boston Biomedical Research Institute, 20 Staniford St., Boston, MA 02114. Phone: (617) 742-2010, ext. 309. Fax: (617) 523-6649. E-mail: badwey{at}disperri.bbri.harvard.edu.

Molecular and Cellular Biology, December 1998, p. 7130-7138, Vol. 18, No. 12
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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