Glucocorticoid Excess Induces Accumulation of Cardiac Glycogen and Triglyceride: Suggested Role for AMPK : Metabolic Syndrome and Cardiovascular Health: A Look Beyond the Horizon
Identifieur interne : 000077 ( PascalFrancis/Checkpoint ); précédent : 000076; suivant : 000078Glucocorticoid Excess Induces Accumulation of Cardiac Glycogen and Triglyceride: Suggested Role for AMPK : Metabolic Syndrome and Cardiovascular Health: A Look Beyond the Horizon
Auteurs : Prasanth Puthanveetil [Canada] ; Brian Rodrigues [Canada]Source :
- Current pharmaceutical design : (Print) [ 1381-6128 ] ; 2013.
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Abstract
Glucocorticoids include steroid hormones released from the adrenal cortex or synthetic analogues developed for various inflammatory and immune disorders. GCs are known to play an important role in maintaining the body's metabolic balance, but their irregular activity has been associated with complications like Cushing's syndrome, insulin resistance, and heart disease. Conventional GC action is through their nuclear receptor activation, but specific and non-specific membrane bound receptor mediated non-genomic actions have also been reported. GCs increase AMPK phosphorylation at Thr172, in addition to augmenting AMPK protein and gene expressions. AMPK is insulin mimetic in many of its actions like glucose uptake and inhibition of lipolysis, and these properties of AMPK are made used in conditions like insulin resistance and diabetes. Nevertheless, if AMPK is activated by GC in the absence of diabetes or decreased insulin signaling, accumulation of substrates in the form of glycogen and triglycerides could precipitate cardiac abnormalities. Glycogen storage can lead to many disorders like hypertrophy, conduction system disease and Wolff Parkinson White syndrome. TG accumulation is associated with generation of free radicals, ceramide formation, mitochondrial dysfunction and cardiac cell death. In this review, we outline the cardiometabolic changes associated with GC, especially related to augmentation in AMPK, and link these changes to cardiac dysfunction.
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GCs are known to play an important role in maintaining the body's metabolic balance, but their irregular activity has been associated with complications like Cushing's syndrome, insulin resistance, and heart disease. Conventional GC action is through their nuclear receptor activation, but specific and non-specific membrane bound receptor mediated non-genomic actions have also been reported. GCs increase AMPK phosphorylation at Thr172, in addition to augmenting AMPK protein and gene expressions. AMPK is insulin mimetic in many of its actions like glucose uptake and inhibition of lipolysis, and these properties of AMPK are made used in conditions like insulin resistance and diabetes. Nevertheless, if AMPK is activated by GC in the absence of diabetes or decreased insulin signaling, accumulation of substrates in the form of glycogen and triglycerides could precipitate cardiac abnormalities. Glycogen storage can lead to many disorders like hypertrophy, conduction system disease and Wolff Parkinson White syndrome. TG accumulation is associated with generation of free radicals, ceramide formation, mitochondrial dysfunction and cardiac cell death. In this review, we outline the cardiometabolic changes associated with GC, especially related to augmentation in AMPK, and link these changes to cardiac dysfunction.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>1381-6128</s0></fA01><fA03 i2="1"><s0>Curr. pharm. des. : (Print)</s0></fA03><fA05><s2>19</s2></fA05><fA06><s2>27</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Glucocorticoid Excess Induces Accumulation of Cardiac Glycogen and Triglyceride: Suggested Role for AMPK : Metabolic Syndrome and Cardiovascular Health: A Look Beyond the Horizon</s1></fA08><fA11 i1="01" i2="1"><s1>PUTHANVEETIL (Prasanth)</s1></fA11><fA11 i1="02" i2="1"><s1>RODRIGUES (Brian)</s1></fA11><fA14 i1="01"><s1>Faculty of Pharmaceutical Sciences, The University of British Columbia, 2146 East Mall</s1><s2>Vancouver, BC V6T 1Z3</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA20><s1>4818-4830</s1></fA20><fA21><s1>2013</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>26320</s2><s5>354000506523700030</s5></fA43><fA44><s0>0000</s0><s1>© 2013 INIST-CNRS. 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AMPK is insulin mimetic in many of its actions like glucose uptake and inhibition of lipolysis, and these properties of AMPK are made used in conditions like insulin resistance and diabetes. Nevertheless, if AMPK is activated by GC in the absence of diabetes or decreased insulin signaling, accumulation of substrates in the form of glycogen and triglycerides could precipitate cardiac abnormalities. Glycogen storage can lead to many disorders like hypertrophy, conduction system disease and Wolff Parkinson White syndrome. TG accumulation is associated with generation of free radicals, ceramide formation, mitochondrial dysfunction and cardiac cell death. 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