Difference between revisions of "Seppet 2005 Mol Cell Biochem"
Harrison DK (talk | contribs) m (moved Seppet 2005 MCB to Seppet 2005 Mol Cell Biochem) |
Beno Marija (talk | contribs) Β |
||
(9 intermediate revisions by 7 users not shown) | |||
Line 1: | Line 1: | ||
{{Publication | {{Publication | ||
|title=Seppet E, Eimre M, Peet N, Paju K, Orlova E, Ress M, Kovask S, Piirsoo A, Saks VA, Gellerich FN, Zierz S, Seppet EK (2005) Compartmentation of energy metabolism in atrial myocardium of patients undergoing cardiac surgery. Mol | |title=Seppet E, Eimre M, Peet N, Paju K, Orlova E, Ress M, Kovask S, Piirsoo A, Saks VA, Gellerich FN, Zierz S, Seppet EK (2005) Compartmentation of energy metabolism in atrial myocardium of patients undergoing cardiac surgery. Mol Cell Biochem 270:49-61. | ||
|info=[http://www.ncbi.nlm.nih.gov/pubmed/15792353 PMID: 15792353] | |info=[http://www.ncbi.nlm.nih.gov/pubmed/15792353 PMID: 15792353] | ||
|authors=Seppet E, Eimre M, Peet N, Paju K, Orlova E, Ress M, Kovask S, Piirsoo A, Saks VA, Gellerich FN, Zierz S, Seppet EK | |authors=Seppet E, Eimre M, Peet N, Paju K, Orlova E, Ress M, Kovask S, Piirsoo A, Saks VA, Gellerich FN, Zierz S, Seppet EK | ||
|year=2005 | |year=2005 | ||
|journal=Mol | |journal=Mol Cell Biochem | ||
|abstract=The parameters of oxidative phosphorylation and its interaction with creatine kinase (CK)- and adenylate kinase (AK)-phosphotransfer networks in situ were studied in skinned atrial fibers from 59 patients undergoing coronary artery bypass surgery, valve replacement/correction and atrial septal defect correction. In atria, the mitochondrial CK and AK are effectively coupled to oxidative phosphorylation, the MM-CK is coupled to ATPases and there exists a direct transfer of adenine nucleotides between mitochondria and ATPases. Elimination of cytoplasmic ADP with exogenous pyruvate kinase was not associated with a blockade of the stimulatory effects of creatine and AMP on respiration, neither could it abolish the coupling of MM-CK to ATPases and direct transfer of adenine nucleotides. Thus, atrial energy metabolism is compartmentalized so that mitochondria form functional complexes with adjacent ATPases. These complexes isolate a part of cellular adenine nucleotides from their cytoplasmic pool for participating in energy transfer via CK- and AK-networks, and/or direct exchange. Compared to atria in sinus rhythm, the fibrillating atria were larger and exhibited increased succinate-dependent respiration relative to glutamate-dependent respiration and augmented proton leak. Thus, alterations in mitochondrial oxidative phosphorylation may contribute to pathogenesis of atrial fibrillation. | |abstract=The parameters of oxidative phosphorylation and its interaction with creatine kinase (CK)- and adenylate kinase (AK)-phosphotransfer networks in situ were studied in skinned atrial fibers from 59 patients undergoing coronary artery bypass surgery, valve replacement/correction and atrial septal defect correction. In atria, the mitochondrial CK and AK are effectively coupled to oxidative phosphorylation, the MM-CK is coupled to ATPases and there exists a direct transfer of adenine nucleotides between mitochondria and ATPases. Elimination of cytoplasmic ADP with exogenous pyruvate kinase was not associated with a blockade of the stimulatory effects of creatine and AMP on respiration, neither could it abolish the coupling of MM-CK to ATPases and direct transfer of adenine nucleotides. Thus, atrial energy metabolism is compartmentalized so that mitochondria form functional complexes with adjacent ATPases. These complexes isolate a part of cellular adenine nucleotides from their cytoplasmic pool for participating in energy transfer via CK- and AK-networks, and/or direct exchange. Compared to atria in sinus rhythm, the fibrillating atria were larger and exhibited increased succinate-dependent respiration relative to glutamate-dependent respiration and augmented proton leak. Thus, alterations in mitochondrial oxidative phosphorylation may contribute to pathogenesis of atrial fibrillation. | ||
|keywords=Skinned fibers, Human myocardium, Mitochondria, Oxidative phosphorylation, Phosphotransfer networks | |keywords=Skinned fibers, Human myocardium, Mitochondria, Oxidative phosphorylation, Phosphotransfer networks | ||
|mipnetlab= | |mipnetlab=EE Tartu Paju K, EE Tallinn Saks VA, EE Tallinn Kaambre T, DE Magdeburg Gellerich FN | ||
|discipline=Biomedicine | |discipline=Biomedicine | ||
}} | }} | ||
{{Labeling | {{Labeling | ||
|organism=Human | |||
|tissues=Heart | |||
|preparations=Permeabilized tissue | |||
|couplingstates=OXPHOS | |||
|instruments=Oxygraph-2k | |instruments=Oxygraph-2k | ||
|discipline=Biomedicine | |discipline=Biomedicine | ||
}} | }} |
Latest revision as of 10:58, 27 March 2018
Seppet E, Eimre M, Peet N, Paju K, Orlova E, Ress M, Kovask S, Piirsoo A, Saks VA, Gellerich FN, Zierz S, Seppet EK (2005) Compartmentation of energy metabolism in atrial myocardium of patients undergoing cardiac surgery. Mol Cell Biochem 270:49-61. |
Seppet E, Eimre M, Peet N, Paju K, Orlova E, Ress M, Kovask S, Piirsoo A, Saks VA, Gellerich FN, Zierz S, Seppet EK (2005) Mol Cell Biochem
Abstract: The parameters of oxidative phosphorylation and its interaction with creatine kinase (CK)- and adenylate kinase (AK)-phosphotransfer networks in situ were studied in skinned atrial fibers from 59 patients undergoing coronary artery bypass surgery, valve replacement/correction and atrial septal defect correction. In atria, the mitochondrial CK and AK are effectively coupled to oxidative phosphorylation, the MM-CK is coupled to ATPases and there exists a direct transfer of adenine nucleotides between mitochondria and ATPases. Elimination of cytoplasmic ADP with exogenous pyruvate kinase was not associated with a blockade of the stimulatory effects of creatine and AMP on respiration, neither could it abolish the coupling of MM-CK to ATPases and direct transfer of adenine nucleotides. Thus, atrial energy metabolism is compartmentalized so that mitochondria form functional complexes with adjacent ATPases. These complexes isolate a part of cellular adenine nucleotides from their cytoplasmic pool for participating in energy transfer via CK- and AK-networks, and/or direct exchange. Compared to atria in sinus rhythm, the fibrillating atria were larger and exhibited increased succinate-dependent respiration relative to glutamate-dependent respiration and augmented proton leak. Thus, alterations in mitochondrial oxidative phosphorylation may contribute to pathogenesis of atrial fibrillation. β’ Keywords: Skinned fibers, Human myocardium, Mitochondria, Oxidative phosphorylation, Phosphotransfer networks
β’ O2k-Network Lab: EE Tartu Paju K, EE Tallinn Saks VA, EE Tallinn Kaambre T, DE Magdeburg Gellerich FN
Labels:
Organism: Human
Tissue;cell: Heart
Preparation: Permeabilized tissue
Coupling state: OXPHOS
HRR: Oxygraph-2k