Carbonylation contributes to SERCA2a activity loss and diastolic dysfunction in a rat model of type 1 diabetes

Chun Hong Shao, Haley L. Capek, Kaushik P Patel, Mu Wang, Kang Tang, Cyrus V Desouza, Ryoji Nagai, William Mayhan, Muthu Periasamy, Keshore R Bidasee

Research output: Contribution to journalArticle

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Abstract

OBJECTIVE - Approximately 25% of children and adolescents with type 1 diabetes will develop diastolic dysfunction. This defect, which is characterized by an increase in time to cardiac relaxation, results in part from a reduction in the activity of the sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA2a), the ATP-driven pump that translocates Ca2+ from the cytoplasm to the lumen of the sarcoplasmic reticulum. To date, mechanisms responsible for SERCA2a activity loss remain incompletely characterized. RESEARCH DESIGN AND METHODS - The streptozotocin (STZ)-induced murine model of type 1 diabetes, in combination with echocardiography, high-speed video detection, confocal microscopy, ATPase and Ca2+ uptake assays, Western blots, mass spectrometry, and site-directed mutagenesis, were used to assess whether modification by reactive carbonyl species (RCS) contributes to SERCA2a activity loss. RESULTS - After 6-7 weeks of diabetes, cardiac and myocyte relaxation times were prolonged. Total ventricular SERCA2a protein remained unchanged, but its ability to hydrolyze ATP and transport Ca 2+ was significantly reduced. Western blots and mass spectroscopic analyses revealed carbonyl adducts on select basic residues of SERCA2a. Mutating affected residues to mimic physio-chemical changes induced on them by RCS reduced SERCA2a activity. Preincubating with the RCS, methylglyoxal (MGO) likewise reduced SERCA2a activity. Mutating an impacted residue to chemically inert glutamine did not alter SERCA2a activity, but it blunted MGO's effect. Treating STZ-induced diabetic animals with the RCS scavenger, pyridoxamine, blunted SERCA2a activity loss and minimized diastolic dysfunction. CONCLUSIONS - These data identify carbonylation as a novel mechanism that contributes to SERCA2a activity loss and diastolic dysfunction during type 1 diabetes.

Original languageEnglish (US)
Pages (from-to)947-959
Number of pages13
JournalDiabetes
Volume60
Issue number3
DOIs
StatePublished - Mar 1 2011

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Reticulum
Calcium-Transporting ATPases
Type 1 Diabetes Mellitus
Streptozocin
Adenosine Triphosphate
Western Blotting
Pyridoxamine
Pyruvaldehyde
Sarcoplasmic Reticulum
Site-Directed Mutagenesis
Glutamine
Cardiac Myocytes
Confocal Microscopy
Echocardiography
Mass Spectrometry
Cytoplasm
Research Design

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

Carbonylation contributes to SERCA2a activity loss and diastolic dysfunction in a rat model of type 1 diabetes. / Shao, Chun Hong; Capek, Haley L.; Patel, Kaushik P; Wang, Mu; Tang, Kang; Desouza, Cyrus V; Nagai, Ryoji; Mayhan, William; Periasamy, Muthu; Bidasee, Keshore R.

In: Diabetes, Vol. 60, No. 3, 01.03.2011, p. 947-959.

Research output: Contribution to journalArticle

Shao, Chun Hong ; Capek, Haley L. ; Patel, Kaushik P ; Wang, Mu ; Tang, Kang ; Desouza, Cyrus V ; Nagai, Ryoji ; Mayhan, William ; Periasamy, Muthu ; Bidasee, Keshore R. / Carbonylation contributes to SERCA2a activity loss and diastolic dysfunction in a rat model of type 1 diabetes. In: Diabetes. 2011 ; Vol. 60, No. 3. pp. 947-959.
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T1 - Carbonylation contributes to SERCA2a activity loss and diastolic dysfunction in a rat model of type 1 diabetes

AU - Shao, Chun Hong

AU - Capek, Haley L.

AU - Patel, Kaushik P

AU - Wang, Mu

AU - Tang, Kang

AU - Desouza, Cyrus V

AU - Nagai, Ryoji

AU - Mayhan, William

AU - Periasamy, Muthu

AU - Bidasee, Keshore R

PY - 2011/3/1

Y1 - 2011/3/1

N2 - OBJECTIVE - Approximately 25% of children and adolescents with type 1 diabetes will develop diastolic dysfunction. This defect, which is characterized by an increase in time to cardiac relaxation, results in part from a reduction in the activity of the sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA2a), the ATP-driven pump that translocates Ca2+ from the cytoplasm to the lumen of the sarcoplasmic reticulum. To date, mechanisms responsible for SERCA2a activity loss remain incompletely characterized. RESEARCH DESIGN AND METHODS - The streptozotocin (STZ)-induced murine model of type 1 diabetes, in combination with echocardiography, high-speed video detection, confocal microscopy, ATPase and Ca2+ uptake assays, Western blots, mass spectrometry, and site-directed mutagenesis, were used to assess whether modification by reactive carbonyl species (RCS) contributes to SERCA2a activity loss. RESULTS - After 6-7 weeks of diabetes, cardiac and myocyte relaxation times were prolonged. Total ventricular SERCA2a protein remained unchanged, but its ability to hydrolyze ATP and transport Ca 2+ was significantly reduced. Western blots and mass spectroscopic analyses revealed carbonyl adducts on select basic residues of SERCA2a. Mutating affected residues to mimic physio-chemical changes induced on them by RCS reduced SERCA2a activity. Preincubating with the RCS, methylglyoxal (MGO) likewise reduced SERCA2a activity. Mutating an impacted residue to chemically inert glutamine did not alter SERCA2a activity, but it blunted MGO's effect. Treating STZ-induced diabetic animals with the RCS scavenger, pyridoxamine, blunted SERCA2a activity loss and minimized diastolic dysfunction. CONCLUSIONS - These data identify carbonylation as a novel mechanism that contributes to SERCA2a activity loss and diastolic dysfunction during type 1 diabetes.

AB - OBJECTIVE - Approximately 25% of children and adolescents with type 1 diabetes will develop diastolic dysfunction. This defect, which is characterized by an increase in time to cardiac relaxation, results in part from a reduction in the activity of the sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA2a), the ATP-driven pump that translocates Ca2+ from the cytoplasm to the lumen of the sarcoplasmic reticulum. To date, mechanisms responsible for SERCA2a activity loss remain incompletely characterized. RESEARCH DESIGN AND METHODS - The streptozotocin (STZ)-induced murine model of type 1 diabetes, in combination with echocardiography, high-speed video detection, confocal microscopy, ATPase and Ca2+ uptake assays, Western blots, mass spectrometry, and site-directed mutagenesis, were used to assess whether modification by reactive carbonyl species (RCS) contributes to SERCA2a activity loss. RESULTS - After 6-7 weeks of diabetes, cardiac and myocyte relaxation times were prolonged. Total ventricular SERCA2a protein remained unchanged, but its ability to hydrolyze ATP and transport Ca 2+ was significantly reduced. Western blots and mass spectroscopic analyses revealed carbonyl adducts on select basic residues of SERCA2a. Mutating affected residues to mimic physio-chemical changes induced on them by RCS reduced SERCA2a activity. Preincubating with the RCS, methylglyoxal (MGO) likewise reduced SERCA2a activity. Mutating an impacted residue to chemically inert glutamine did not alter SERCA2a activity, but it blunted MGO's effect. Treating STZ-induced diabetic animals with the RCS scavenger, pyridoxamine, blunted SERCA2a activity loss and minimized diastolic dysfunction. CONCLUSIONS - These data identify carbonylation as a novel mechanism that contributes to SERCA2a activity loss and diastolic dysfunction during type 1 diabetes.

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