Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases

Ying Hefner, Angelika G. Börsch-Haubold, Makomoto Murakami, Jonathan I. Wilde, Sophie Pasquet, David Schieltz, Farideh Ghomashchi, John R. Yates, Christopher G. Armstrong, Andrew Paterson, Philip Cohen, Rikiro Fukunaga, Tony Hunter, Ichiro Kudo, Steve P. Watson, Michael H. Gelba

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    Abstract

    We have previously reported that in thrombin-stimulated human platelets, cytosolic phospholipase A2 (cPLA2) is phosphorylated on Ser-505 by p38 protein kinase and on Ser-727 by an unknown kinase. Pharmacological inhibition of p38 leads to inhibition of cPLA2 phosphorylation at both Ser-505 and Ser-727 suggesting that the kinase responsible for phosphorylation on Ser-727 is activated in a p38-dependent pathway. By using Chinese hamster ovary, HeLa, and HEK293 cells stably transfected with wild type and phosphorylation site mutant forms of cPLA2, we show that phosphorylation of cPLA2 at both Ser-505 and Ser-727 and elevation of Ca2+ leads to its activation in agonist-stimulated cells. The p38-activated protein kinases MNK1, MSK1, and PRAK1 phosphorylate cPLA2 in vitro uniquely on Ser-727 as shown by mass spectrometry. Furthermore, MNK1 and PRAK1, but not MSK1, is present in platelets and undergo modest activation in response to thrombin. Expression of a dominant negative form of MNK1 in HEK293 cells leads to significant inhibition of cPLA2-mediated arachidonate release. The results suggest that MNK1 or a closely related kinase is responsible for in vivo phosphorylation of cPLA2 on Ser-727.

    Original languageEnglish
    Pages (from-to)37542-37551
    Number of pages10
    JournalJournal of Biological Chemistry
    Volume275
    Issue number48
    DOIs
    Publication statusPublished - 1 Dec 2000

    Fingerprint

    Cytosolic Phospholipases A2
    Phosphorylation
    Protein Kinases
    Serine
    Chemical activation
    Phosphotransferases
    HEK293 Cells
    p38 Mitogen-Activated Protein Kinases
    Platelets
    Thrombin
    Blood Platelets
    Cricetulus
    HeLa Cells
    Mass spectrometry
    Ovary
    Mass Spectrometry
    Pharmacology

    Cite this

    Hefner, Y., Börsch-Haubold, A. G., Murakami, M., Wilde, J. I., Pasquet, S., Schieltz, D., ... Gelba, M. H. (2000). Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases. Journal of Biological Chemistry, 275(48), 37542-37551. https://doi.org/10.1074/jbc.M003395200
    Hefner, Ying ; Börsch-Haubold, Angelika G. ; Murakami, Makomoto ; Wilde, Jonathan I. ; Pasquet, Sophie ; Schieltz, David ; Ghomashchi, Farideh ; Yates, John R. ; Armstrong, Christopher G. ; Paterson, Andrew ; Cohen, Philip ; Fukunaga, Rikiro ; Hunter, Tony ; Kudo, Ichiro ; Watson, Steve P. ; Gelba, Michael H. / Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases. In: Journal of Biological Chemistry. 2000 ; Vol. 275, No. 48. pp. 37542-37551.
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    title = "Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases",
    abstract = "We have previously reported that in thrombin-stimulated human platelets, cytosolic phospholipase A2 (cPLA2) is phosphorylated on Ser-505 by p38 protein kinase and on Ser-727 by an unknown kinase. Pharmacological inhibition of p38 leads to inhibition of cPLA2 phosphorylation at both Ser-505 and Ser-727 suggesting that the kinase responsible for phosphorylation on Ser-727 is activated in a p38-dependent pathway. By using Chinese hamster ovary, HeLa, and HEK293 cells stably transfected with wild type and phosphorylation site mutant forms of cPLA2, we show that phosphorylation of cPLA2 at both Ser-505 and Ser-727 and elevation of Ca2+ leads to its activation in agonist-stimulated cells. The p38-activated protein kinases MNK1, MSK1, and PRAK1 phosphorylate cPLA2 in vitro uniquely on Ser-727 as shown by mass spectrometry. Furthermore, MNK1 and PRAK1, but not MSK1, is present in platelets and undergo modest activation in response to thrombin. Expression of a dominant negative form of MNK1 in HEK293 cells leads to significant inhibition of cPLA2-mediated arachidonate release. The results suggest that MNK1 or a closely related kinase is responsible for in vivo phosphorylation of cPLA2 on Ser-727.",
    author = "Ying Hefner and B{\"o}rsch-Haubold, {Angelika G.} and Makomoto Murakami and Wilde, {Jonathan I.} and Sophie Pasquet and David Schieltz and Farideh Ghomashchi and Yates, {John R.} and Armstrong, {Christopher G.} and Andrew Paterson and Philip Cohen and Rikiro Fukunaga and Tony Hunter and Ichiro Kudo and Watson, {Steve P.} and Gelba, {Michael H.}",
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    Hefner, Y, Börsch-Haubold, AG, Murakami, M, Wilde, JI, Pasquet, S, Schieltz, D, Ghomashchi, F, Yates, JR, Armstrong, CG, Paterson, A, Cohen, P, Fukunaga, R, Hunter, T, Kudo, I, Watson, SP & Gelba, MH 2000, 'Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases', Journal of Biological Chemistry, vol. 275, no. 48, pp. 37542-37551. https://doi.org/10.1074/jbc.M003395200

    Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases. / Hefner, Ying; Börsch-Haubold, Angelika G.; Murakami, Makomoto; Wilde, Jonathan I.; Pasquet, Sophie; Schieltz, David; Ghomashchi, Farideh; Yates, John R.; Armstrong, Christopher G.; Paterson, Andrew; Cohen, Philip; Fukunaga, Rikiro; Hunter, Tony; Kudo, Ichiro; Watson, Steve P.; Gelba, Michael H.

    In: Journal of Biological Chemistry, Vol. 275, No. 48, 01.12.2000, p. 37542-37551.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases

    AU - Hefner, Ying

    AU - Börsch-Haubold, Angelika G.

    AU - Murakami, Makomoto

    AU - Wilde, Jonathan I.

    AU - Pasquet, Sophie

    AU - Schieltz, David

    AU - Ghomashchi, Farideh

    AU - Yates, John R.

    AU - Armstrong, Christopher G.

    AU - Paterson, Andrew

    AU - Cohen, Philip

    AU - Fukunaga, Rikiro

    AU - Hunter, Tony

    AU - Kudo, Ichiro

    AU - Watson, Steve P.

    AU - Gelba, Michael H.

    PY - 2000/12/1

    Y1 - 2000/12/1

    N2 - We have previously reported that in thrombin-stimulated human platelets, cytosolic phospholipase A2 (cPLA2) is phosphorylated on Ser-505 by p38 protein kinase and on Ser-727 by an unknown kinase. Pharmacological inhibition of p38 leads to inhibition of cPLA2 phosphorylation at both Ser-505 and Ser-727 suggesting that the kinase responsible for phosphorylation on Ser-727 is activated in a p38-dependent pathway. By using Chinese hamster ovary, HeLa, and HEK293 cells stably transfected with wild type and phosphorylation site mutant forms of cPLA2, we show that phosphorylation of cPLA2 at both Ser-505 and Ser-727 and elevation of Ca2+ leads to its activation in agonist-stimulated cells. The p38-activated protein kinases MNK1, MSK1, and PRAK1 phosphorylate cPLA2 in vitro uniquely on Ser-727 as shown by mass spectrometry. Furthermore, MNK1 and PRAK1, but not MSK1, is present in platelets and undergo modest activation in response to thrombin. Expression of a dominant negative form of MNK1 in HEK293 cells leads to significant inhibition of cPLA2-mediated arachidonate release. The results suggest that MNK1 or a closely related kinase is responsible for in vivo phosphorylation of cPLA2 on Ser-727.

    AB - We have previously reported that in thrombin-stimulated human platelets, cytosolic phospholipase A2 (cPLA2) is phosphorylated on Ser-505 by p38 protein kinase and on Ser-727 by an unknown kinase. Pharmacological inhibition of p38 leads to inhibition of cPLA2 phosphorylation at both Ser-505 and Ser-727 suggesting that the kinase responsible for phosphorylation on Ser-727 is activated in a p38-dependent pathway. By using Chinese hamster ovary, HeLa, and HEK293 cells stably transfected with wild type and phosphorylation site mutant forms of cPLA2, we show that phosphorylation of cPLA2 at both Ser-505 and Ser-727 and elevation of Ca2+ leads to its activation in agonist-stimulated cells. The p38-activated protein kinases MNK1, MSK1, and PRAK1 phosphorylate cPLA2 in vitro uniquely on Ser-727 as shown by mass spectrometry. Furthermore, MNK1 and PRAK1, but not MSK1, is present in platelets and undergo modest activation in response to thrombin. Expression of a dominant negative form of MNK1 in HEK293 cells leads to significant inhibition of cPLA2-mediated arachidonate release. The results suggest that MNK1 or a closely related kinase is responsible for in vivo phosphorylation of cPLA2 on Ser-727.

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    Hefner Y, Börsch-Haubold AG, Murakami M, Wilde JI, Pasquet S, Schieltz D et al. Serine 727 phosphorylation and activation of cytosolic phospholipase A2 by MNK1-related protein kinases. Journal of Biological Chemistry. 2000 Dec 1;275(48):37542-37551. https://doi.org/10.1074/jbc.M003395200