Calcium and zinc dyshomeostasis during isoproterenol-induced acute stressor state

Atta U. Shahbaz, Tieqiang Zhao, Wenyuan Zhao, Patti L. Johnson, Robert A. Ahokas, Syamal Bhattacharya, Yao Sun, Ivan Gerling, Karl Weber

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Acute hyperadrenergic stressor states are accompanied by cation dyshomeostasis, together with the release of cardiac troponins predictive of necrosis. The signal-transducer-effector pathway accounting for this pathophysiological scenario remains unclear. We hypothesized that a dyshomeostasis of extra- and intracellular Ca2+ and Zn2+ occurs in rats in response to isoproterenol (Isop) including excessive intracellular Ca2+ accumulation (EICA) and mitochondrial [Ca 2+]m-induced oxidative stress. Contemporaneously, the selective translocation of Ca2+ and Zn2+ to tissues contributes to their fallen plasma levels. Rats received a single subcutaneous injection of Isop (1 mg/kg body wt). Other groups of rats received pretreatment for 10 days with either carvedilol (C), a β-adrenergic receptor antagonist with mitochondrial Ca2+ uniporter-inhibiting properties, or quercetin (Q), a flavonoid with mitochondrial-targeted antioxidant properties, before Isop. We monitored temporal responses in the following: [Ca2+] and [Zn2+] in plasma, left ventricular (LV) apex, equator and base, skeletal muscle, liver, spleen, and peripheral blood mononuclear cells (PBMC), indices of oxidative stress and antioxidant defenses, mitochondrial permeability transition pore (mPTP) opening, and myocardial fibrosis. We found ionized hypocalcemia and hypozincemia attributable to their tissue translocation and also a heterogeneous distribution of these cations among tissues with a preferential Ca2+ accumulation in the LV apex, muscle, and PBMC, whereas Zn2+ declined except in liver, where it increased corresponding with upregulation of metallothionein, a Zn2+-binding protein. EICA was associated with a simultaneous increase in tissue 8-isoprostane and increased [Ca2+]m accompanied by a rise in H2O2 generation, mPTP opening, and scarring, each of which were prevented by either C or Q. Thus excessive [Ca2+] m, coupled with the induction of oxidative stress and increased mPTP opening, suggests that this signal-transducer-effector pathway is responsible for Isop-induced cardiomyocyte necrosis at the LV apex.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume300
Issue number2
DOIs
StatePublished - Feb 1 2011

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Isoproterenol
Zinc
Calcium
8-epi-prostaglandin F2alpha
Oxidative Stress
Transducers
Cations
Blood Cells
Necrosis
Antioxidants
Adrenergic Antagonists
Troponin
Hypocalcemia
Metallothionein
Liver
Quercetin
Subcutaneous Injections
Flavonoids
Cardiac Myocytes
Cicatrix

All Science Journal Classification (ASJC) codes

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

Cite this

Calcium and zinc dyshomeostasis during isoproterenol-induced acute stressor state. / Shahbaz, Atta U.; Zhao, Tieqiang; Zhao, Wenyuan; Johnson, Patti L.; Ahokas, Robert A.; Bhattacharya, Syamal; Sun, Yao; Gerling, Ivan; Weber, Karl.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 300, No. 2, 01.02.2011.

Research output: Contribution to journalArticle

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AU - Ahokas, Robert A.

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