Marginal dietary zinc deficiency in vivo induces vascular smooth muscle cell apoptosis in large arteries

Keith Allen-Redpath, Ou Ou, John H Beattie, In-Sook Kwun, Jorg Feldmann, Graeme F Nixon

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Abstract

AIMS: Dietary zinc deficiency has been associated with the development of atherosclerosis although the effects on vascular smooth muscle cells (VSMCs), important in maintaining atherosclerotic plaque integrity, are unknown. The main aim of this study was to elucidate the effect of a zinc-deficient environment on VSMCs using an in vivo model. METHODS AND RESULTS: Rats were maintained for 2 weeks on a marginally zinc-deficient diet which resulted in a significant reduction in plasma zinc levels. Large arteries from zinc-deficient rats had significantly increased apoptosis within the VSMC layers compared with arteries from rats on a zinc-adequate diet. This apoptosis occurred in parallel with a known apoptotic pathway, namely dephosphorylation of the pro-apoptotic protein Bcl-2-associated death promoter protein (BAD). Activation of extracellular signal-regulated kinase (ERK)1/2, which maintains BAD phosphorylation as a pro-survival mechanism, was decreased in arteries from zinc-deficient rats. The mechanisms of this in vivo effect were investigated in vitro. Cultured rat VSMCs incubated with plasma from zinc-deficient rats similarly resulted in increased apoptosis in parallel with BAD dephosphorylation and decreased ERK1/2 activation. Further related apoptotic mechanisms induced by plasma from zinc-deficient rats involved a prolonged rise in [Ca(2+)]i leading to subsequent activation of the phosphatase calcineurin. Calcineurin activation was required to dephosphorylate BAD. In addition, an increase in oxidative stress contributed to the apoptotic effect induced by plasma from zinc-deficient rats. CONCLUSION: In conclusion, a marginally zinc-deficient diet is pro-apoptotic for VSMCs and this may contribute to cardiovascular disease.
Original languageEnglish
Pages (from-to)525–534
Number of pages10
JournalCardiovascular Research
Volume99
Issue number3
Early online date10 May 2013
DOIs
Publication statusPublished - 1 Aug 2013

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Vascular Smooth Muscle
Smooth Muscle Myocytes
Zinc
Arteries
Apoptosis
Diet
Apoptosis Regulatory Proteins
Mitogen-Activated Protein Kinase 3
Calcineurin
Mitogen-Activated Protein Kinase 1
Atherosclerotic Plaques
Atherosclerosis
Oxidative Stress
Cardiovascular Diseases
Phosphorylation

Keywords

  • vascular smooth muscle cell
  • artery
  • zinc deficiency
  • apoptosis

Cite this

Marginal dietary zinc deficiency in vivo induces vascular smooth muscle cell apoptosis in large arteries. / Allen-Redpath, Keith; Ou, Ou; Beattie, John H; Kwun, In-Sook; Feldmann, Jorg; Nixon, Graeme F.

In: Cardiovascular Research, Vol. 99, No. 3, 01.08.2013, p. 525–534.

Research output: Contribution to journalArticle

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