ANG II stimulates phospholipase D through PKCζ activation in VSMC: Implications in adhesion, spreading, and hypertrophy

Jean Hugues Parmentier, Zoran Pavicevic, Kafait Malik

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Abstract

ANG II stimulates phospholipase D (PLD) activity and growth of vascular smooth muscle cells (VSMC). The atypical protein kinase C-ζ (PKCζ) plays a central role in the regulation of cell survival and proliferation. This study was conducted to determine the relationship between ANG II-induced activation of PKCζ and PLD and their implication in VSMC adhesion, spreading, and hypertrophy. ANG II stimulated PKCζ activity with maximal activation at 30 s followed by a decline in its activity to 45% above basal at 5 min. Inhibition of PKCζ activity with a myristoylated pseudosubstrate peptide or overexpression of a kinase-inactive form of PKCζ decreased ANG II-induced PLD activity. Moreover, depletion of PKCζ with selective antisense oligonucleotides also decreased ANG II-induced PLD activity. Interaction between PLD2 and PKCζ in VSMC was detected by coimmunoprecipitation. ANG II-induced PLD activity was inhibited by the primary alcohol n-butanol but not the tertiary alcohol t-butanol. The functional significance of PKCζ and PLD2 in VSMC adhesion, spreading, and hypertrophy was investigated. Inhibition of PKCζ and PLD2 activity or expression attenuated VSMC adhesion to collagen I and ANG II-induced cell spreading and hypertrophy. These results demonstrate that ANG II-induced PLD activation is regulated by PKCζ and suggest a crucial role of PKCζ-dependent PLD2 in VSMC functions such as adhesion, spreading, and hypertrophy, which are associated with the pathogenesis of atherosclerosis and malignant hypertension.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume290
Issue number1
DOIs
StatePublished - Jan 1 2006

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Phospholipase D
Vascular Smooth Muscle
Protein Kinase C
Hypertrophy
Smooth Muscle Myocytes
Cell Adhesion
Alcohols
tert-Butyl Alcohol
Malignant Hypertension
1-Butanol
Antisense Oligonucleotides
Cell Survival
Atherosclerosis
Phosphotransferases
Collagen
Cell Proliferation

All Science Journal Classification (ASJC) codes

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

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title = "ANG II stimulates phospholipase D through PKCζ activation in VSMC: Implications in adhesion, spreading, and hypertrophy",
abstract = "ANG II stimulates phospholipase D (PLD) activity and growth of vascular smooth muscle cells (VSMC). The atypical protein kinase C-ζ (PKCζ) plays a central role in the regulation of cell survival and proliferation. This study was conducted to determine the relationship between ANG II-induced activation of PKCζ and PLD and their implication in VSMC adhesion, spreading, and hypertrophy. ANG II stimulated PKCζ activity with maximal activation at 30 s followed by a decline in its activity to 45{\%} above basal at 5 min. Inhibition of PKCζ activity with a myristoylated pseudosubstrate peptide or overexpression of a kinase-inactive form of PKCζ decreased ANG II-induced PLD activity. Moreover, depletion of PKCζ with selective antisense oligonucleotides also decreased ANG II-induced PLD activity. Interaction between PLD2 and PKCζ in VSMC was detected by coimmunoprecipitation. ANG II-induced PLD activity was inhibited by the primary alcohol n-butanol but not the tertiary alcohol t-butanol. The functional significance of PKCζ and PLD2 in VSMC adhesion, spreading, and hypertrophy was investigated. Inhibition of PKCζ and PLD2 activity or expression attenuated VSMC adhesion to collagen I and ANG II-induced cell spreading and hypertrophy. These results demonstrate that ANG II-induced PLD activation is regulated by PKCζ and suggest a crucial role of PKCζ-dependent PLD2 in VSMC functions such as adhesion, spreading, and hypertrophy, which are associated with the pathogenesis of atherosclerosis and malignant hypertension.",
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AU - Malik, Kafait

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AB - ANG II stimulates phospholipase D (PLD) activity and growth of vascular smooth muscle cells (VSMC). The atypical protein kinase C-ζ (PKCζ) plays a central role in the regulation of cell survival and proliferation. This study was conducted to determine the relationship between ANG II-induced activation of PKCζ and PLD and their implication in VSMC adhesion, spreading, and hypertrophy. ANG II stimulated PKCζ activity with maximal activation at 30 s followed by a decline in its activity to 45% above basal at 5 min. Inhibition of PKCζ activity with a myristoylated pseudosubstrate peptide or overexpression of a kinase-inactive form of PKCζ decreased ANG II-induced PLD activity. Moreover, depletion of PKCζ with selective antisense oligonucleotides also decreased ANG II-induced PLD activity. Interaction between PLD2 and PKCζ in VSMC was detected by coimmunoprecipitation. ANG II-induced PLD activity was inhibited by the primary alcohol n-butanol but not the tertiary alcohol t-butanol. The functional significance of PKCζ and PLD2 in VSMC adhesion, spreading, and hypertrophy was investigated. Inhibition of PKCζ and PLD2 activity or expression attenuated VSMC adhesion to collagen I and ANG II-induced cell spreading and hypertrophy. These results demonstrate that ANG II-induced PLD activation is regulated by PKCζ and suggest a crucial role of PKCζ-dependent PLD2 in VSMC functions such as adhesion, spreading, and hypertrophy, which are associated with the pathogenesis of atherosclerosis and malignant hypertension.

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