Protein kinase C activation inhibits stress-induced synthesis of heat shock protein 27 in osteoblast-like cells: Function of arachidonic acid

Atsushi Suzuki, Osamu Kozawa, Yutaka Oiso, Kanefusa Kato

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Abstract

Exposure of osteoblast-like MC3T3-E1 cells to sodium arsenite (arsenite) increased the level of heat shock protein 27 (hsp27). The effect of arsenite was dose-dependent in the range of 50 to 200 μM. Arsenite also stimulated arachidonic acid release dose-dependently in the range between 50 and 200 μM in these cells. Both indomethacin, an inhibitor of cyclooxygenase, and nordihydroguaiaretic acid, a lipoxygenase inhibitor, significantly enhanced the arsenite-induced accumulation of hsp27. Melittin, an activator of phospholipase A2, significantly enhanced the arsenite-induced accumulation of hsp27. 12-O-Tetradecanoylphorbol-13-acetate (TPA), a protein kinase C (PKC)-activating phorbol ester, inhibited the arsenite-induced accumulation of hsp27. In contrast, 4α-phorbol 12,13-didecanoate (4α-PDD), a PKC- nonactivating phorbol ester, had little effect. TPA suppressed the arsenite- induced arachidonic acid release, but 4α-PDD had little effect. Arsenite no longer affected cAMP accumulation, inositol phosphates formation nor the formation of choline and phosphocholine in these cells. These results suggest that the response to stress of hsp27 is coupled with the metabolic activity of the arachidonic acid cascade, and the activation of PKC inhibits the induction of hsp27 through the suppression of arachidonic acid release in osteoblast-like cells.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalJournal of Cellular Biochemistry
Volume62
Issue number1
DOIs
Publication statusPublished - 01-07-1996

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HSP27 Heat-Shock Proteins
Osteoblasts
Arachidonic Acid
Protein Kinase C
Chemical activation
Phorbol Esters
Tetradecanoylphorbol Acetate
Acetates
Masoprocol
Melitten
Lipoxygenase Inhibitors
Inositol Phosphates
Phosphorylcholine
Cyclooxygenase Inhibitors
arsenite
Phospholipases A2
Choline
Indomethacin

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

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title = "Protein kinase C activation inhibits stress-induced synthesis of heat shock protein 27 in osteoblast-like cells: Function of arachidonic acid",
abstract = "Exposure of osteoblast-like MC3T3-E1 cells to sodium arsenite (arsenite) increased the level of heat shock protein 27 (hsp27). The effect of arsenite was dose-dependent in the range of 50 to 200 μM. Arsenite also stimulated arachidonic acid release dose-dependently in the range between 50 and 200 μM in these cells. Both indomethacin, an inhibitor of cyclooxygenase, and nordihydroguaiaretic acid, a lipoxygenase inhibitor, significantly enhanced the arsenite-induced accumulation of hsp27. Melittin, an activator of phospholipase A2, significantly enhanced the arsenite-induced accumulation of hsp27. 12-O-Tetradecanoylphorbol-13-acetate (TPA), a protein kinase C (PKC)-activating phorbol ester, inhibited the arsenite-induced accumulation of hsp27. In contrast, 4α-phorbol 12,13-didecanoate (4α-PDD), a PKC- nonactivating phorbol ester, had little effect. TPA suppressed the arsenite- induced arachidonic acid release, but 4α-PDD had little effect. Arsenite no longer affected cAMP accumulation, inositol phosphates formation nor the formation of choline and phosphocholine in these cells. These results suggest that the response to stress of hsp27 is coupled with the metabolic activity of the arachidonic acid cascade, and the activation of PKC inhibits the induction of hsp27 through the suppression of arachidonic acid release in osteoblast-like cells.",
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Protein kinase C activation inhibits stress-induced synthesis of heat shock protein 27 in osteoblast-like cells : Function of arachidonic acid. / Suzuki, Atsushi; Kozawa, Osamu; Oiso, Yutaka; Kato, Kanefusa.

In: Journal of Cellular Biochemistry, Vol. 62, No. 1, 01.07.1996, p. 69-75.

Research output: Contribution to journalArticle

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T1 - Protein kinase C activation inhibits stress-induced synthesis of heat shock protein 27 in osteoblast-like cells

T2 - Function of arachidonic acid

AU - Suzuki, Atsushi

AU - Kozawa, Osamu

AU - Oiso, Yutaka

AU - Kato, Kanefusa

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