Abstract
Inositol 1,4,5-trisphosphate (IP 3) receptors are calcium-releasing channels localized on the sarcoplasmic reticulum. IP 3 receptors mediate the calcium mobilizing effect of a wide range of hormones, cytokines, and neurotransmitters and play an important role in variety of cell functions. The aim of this work was to study, how partial depletion of catecholamines affects the gene expression and protein levels of the type 1 IP 3 receptors in rat heart. The type 1 IP 3 receptor mRNA levels were studied in the left cardiac atrium and ventricle of rats treated with 6-hydroxydopamine (6-OHDA) in control and stressed conditions. The 6-OHDA produces anatomical and functional denervation resulting in decreased levels of noradrenaline and adrenaline. We also used corticoliberin (CRH) knockout mice, where secretion of adrenaline is significantly suppressed. Administration of 6-OHDA significantly decreases mRNA levels of the type 1 IP 3 receptor in both, the left atrium and the left ventricle, while the gene expression of the sarcoplasmic reticular Ca 2+-ATPase (SERCA 2) was unaffected. CRH knockout mice possess markedly lower levels of the type 1 IP 3 receptor mRNA compared to wild-type mice in both, control and stressed conditions. These data point to the adrenergic modulation of the type 1 IP 3 receptors in the rat hearts.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
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