Cardiac-specific suppression of NF-[kappa]B signaling prevents diabetic cardiomyopathy via inhibition of the renin-angiotensin system

Activation of NF-...B signaling in the heart may be protective or deleterious depending on the pathological context. In diabetes, the role of NF-...B in cardiac dysfunction has been investigated using pharmacological approaches that have a limitation of being nonspecific. Furthermore, the specific c...

Full description

Saved in:
Bibliographic Details
Published in:American journal of physiology. Heart and circulatory physiology 2014-10, Vol.307 (7), p.H1036
Main Authors: Thomas, Candice M, Yong, Qian Chen, Rosa, Rodolfo M, Seqqat, Rachid, Gopal, Shanthi, Casarini, Dulce E, Jones, W Keith, Gupta, Sudhiranjan, Baker, Kenneth M, Kumar, Rajesh
Format: Article
Language:English
Subjects:
Gene expression
Heart
Hormones
Oxidative stress
Rodents
Signal transduction
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Activation of NF-...B signaling in the heart may be protective or deleterious depending on the pathological context. In diabetes, the role of NF-...B in cardiac dysfunction has been investigated using pharmacological approaches that have a limitation of being nonspecific. Furthermore, the specific cellular pathways by which NF-...B modulates heart function in diabetes have not been identified. To address these questions, we used a transgenic mouse line expressing mutated I...B-α in the heart (3M mice), which prevented activation of canonical NF-...B signaling. Diabetes was developed by streptozotocin injections in wild-type (WT) and 3M mice. Diabetic WT mice developed systolic and diastolic cardiac dysfunction by the 12th week, as measured by echocardiography. In contrast, cardiac function was preserved in 3M mice up to 24 wk of diabetes. Diabetes induced an elevation in cardiac oxidative stress in diabetic WT mice but not 3M mice compared with nondiabetic control mice. In diabetic WT mice, an increase in the phospholamban/sarco(endo)plasmic reticulum Ca...-ATPase 2 ratio and decrease in ryanodine receptor expression were observed, whereas diabetic 3M mice showed an opposite effect on these parameters of Ca... handling. Significantly, renin-angiotensin system activity was suppressed in diabetic 3M mice compared with an increase in WT animals. In conclusion, these results demonstrate that inhibition of NF-...B signaling in the heart prevents diabetes-induced cardiac dysfunction through preserved Ca... handling and inhibition of the cardiac renin-angiotensin system. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0363-6135
1522-1539