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Related Experiment Videos

Angiotensin II-induced increase of T-type Ca2+ current and decrease of L-type Ca2+ current in heart cells.

Ghassan Bkaily1, Adrian Sculptoreanu, Shimin Wang

  • 1Department of Anatomy & Cell Biology, Faculty of Medicine, Université de Sherbrooke, 3001-12th Avenue North, Sherbrooke, Que., Canada J1H 5N4. Ghassan.Bkaily@USherbrooke.ca

Peptides
|July 27, 2005
PubMed
Summary
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Angiotensin II differentially affects fetal human and chick heart cell calcium currents, increasing T-type and decreasing L-type currents via the PKC pathway. This effect was blocked by an AT1 antagonist.

Area of Science:

  • Cardiovascular Physiology
  • Developmental Biology
  • Molecular Cardiology

Background:

  • The renin-angiotensin system plays a crucial role in cardiovascular regulation.
  • Calcium currents are essential for cardiomyocyte excitation-contraction coupling.
  • Differential regulation of calcium channel subtypes is critical during cardiac development.

Purpose of the Study:

  • To investigate the effects of angiotensin II (Ang II) on T-type and L-type calcium currents (I(Ca)) in fetal cardiomyocytes.
  • To elucidate the signaling pathways involved in Ang II's modulation of these currents.

Main Methods:

  • Whole-cell voltage clamp technique applied to isolated fetal human and chick ventricular cardiomyocytes.
  • Application of Ang II, AT1 receptor antagonist ([Sar1, Ala8] Ang II), and Protein Kinase C (PKC) activator (phorbol 12,13-dibutyrate).

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Main Results:

  • Ang II (10(-7)M) significantly increased T-type I(Ca) and decreased L-type I(Ca) in both human and chick fetal cardiomyocytes.
  • The effects of Ang II were completely blocked by the AT1 antagonist [Sar1, Ala8] Ang II (2 x 10(-7)M).
  • PKC activation mimicked the effects of Ang II on both T- and L-type calcium currents.

Conclusions:

  • Angiotensin II differentially modulates T- and L-type calcium currents in fetal cardiomyocytes.
  • The observed effects of Ang II are mediated through the Protein Kinase C (PKC) signaling pathway.
  • These findings highlight developmental differences in cardiac calcium channel regulation by the renin-angiotensin system.