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JCI early table of contents for Mar. 1, 2013
Date:3/1/2013

A coordinated response to cardiac stress

Myocardial hypertrophy, a thickening of the heart muscle, is an adaptation that occurs with increased stress on the heart, such as high blood pressure. As the heart muscle expands, it also requires greater blood flow to maintain access to oxygen and nutrients, necessitating an expansion of the cardiac vasculature. In this issue of the Journal of Clinical Investigation, Daniela Tirziu and researchers at Yale University identified a molecular mechanism by which the growth of new blood vessels (angiogenesis) and heart muscle growth are coordinated. Using a mouse model of myocardial hypertrophy, Tirziu and colleagues determined that nitric oxide triggers the destruction of a protein known as RGS4. Nitric oxide typically drives physiological changes associated with the relaxation of blood vessels, while RGS4 attenuates the activity of a cellular signaling pathway that promotes cardiac growth. These findings reveal how increases in heart muscle and blood vessel growth are coordinated, linking changes in vasculature to changes in heart size.

TITLE:
NO triggers RGS4 degradation to coordinate angiogenesis and cardiomyocyte growth

AUTHOR CONTACT:
Daniela Tirziu
Yale School of Medicine, New Haven, CT, USA
Phone: 203-737-2627; Fax: 203-737-6236; E-mail: daniela.tirziu@yale.edu

View this article at: http://www.jci.org/articles/view/65112?key=6e03e6b35dba375333ec


A nanogel-based treatment for lupus

Systemic lupus erythematosus (SLE) is disease in which the immune system mistakenly attacks healthy tissues, resulting in inflammation and tissue damage. Current treatments are focused on suppression of the immune system, but these therapies can leave patients vulnerable to infection. In this issue of th
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Contact: Jillian Hurst
press_releases@the-jci.org
Journal of Clinical Investigation
Source:Eurekalert

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