Creatine uptake in mouse hearts with genetically altered creatine levels.
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Creatine uptake in mouse hearts with genetically altered creatine levels. / Michiel, Ten Hove; Makinen, Kimmo; Sebag-Montefiore, Liam; Hunyor, Imre; Fischer, Alexandra; Wallis, Julie; Isbrandt, Dirk; Lygate, Craig; Neubauer, Stefan.
in: J MOL CELL CARDIOL, Jahrgang 45, Nr. 3, 3, 2008, S. 453-459.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Creatine uptake in mouse hearts with genetically altered creatine levels.
AU - Michiel, Ten Hove
AU - Makinen, Kimmo
AU - Sebag-Montefiore, Liam
AU - Hunyor, Imre
AU - Fischer, Alexandra
AU - Wallis, Julie
AU - Isbrandt, Dirk
AU - Lygate, Craig
AU - Neubauer, Stefan
PY - 2008
Y1 - 2008
N2 - Creatine plays an important role in energy metabolism in the heart. Cardiomyocytes accumulate creatine via a specific creatine transporter (CrT), the capacity of which is reduced in the failing heart, resulting in lower myocardial creatine concentration. Therefore, to gain insight into how the CrT is regulated, we studied two mouse models of severely altered myocardial creatine levels. Cardiac creatine uptake levels were measured in isolated hearts from creatine-free guanidinoacetate-N-methyl transferase knock out (GAMT(-/-)) mice and from mice overexpressing the myocardial CrT (CrT-OE) using (14)C-radiolabeled creatine. CrT mRNA levels were measured using real time RT-PCR and creatine levels with HPLC. Hearts from GAMT(-/-) mice showed a 7-fold increase in V(max) of creatine uptake and a 1.4-fold increase in CrT mRNA levels. The increase in Cr uptake and in CrT mRNA levels, however, was almost completely prevented when mice were fed a creatine supplemented diet, indicating that creatine uptake is subject to negative feedback regulation. Cardiac creatine uptake levels in CrT-OE mice were increased on average 2.7-fold, showing a considerable variation, in line with a similar variation in creatine content. Total CrT mRNA levels correlated well with myocardial creatine content (r=0.67; p
AB - Creatine plays an important role in energy metabolism in the heart. Cardiomyocytes accumulate creatine via a specific creatine transporter (CrT), the capacity of which is reduced in the failing heart, resulting in lower myocardial creatine concentration. Therefore, to gain insight into how the CrT is regulated, we studied two mouse models of severely altered myocardial creatine levels. Cardiac creatine uptake levels were measured in isolated hearts from creatine-free guanidinoacetate-N-methyl transferase knock out (GAMT(-/-)) mice and from mice overexpressing the myocardial CrT (CrT-OE) using (14)C-radiolabeled creatine. CrT mRNA levels were measured using real time RT-PCR and creatine levels with HPLC. Hearts from GAMT(-/-) mice showed a 7-fold increase in V(max) of creatine uptake and a 1.4-fold increase in CrT mRNA levels. The increase in Cr uptake and in CrT mRNA levels, however, was almost completely prevented when mice were fed a creatine supplemented diet, indicating that creatine uptake is subject to negative feedback regulation. Cardiac creatine uptake levels in CrT-OE mice were increased on average 2.7-fold, showing a considerable variation, in line with a similar variation in creatine content. Total CrT mRNA levels correlated well with myocardial creatine content (r=0.67; p
M3 - SCORING: Zeitschriftenaufsatz
VL - 45
SP - 453
EP - 459
JO - J MOL CELL CARDIOL
JF - J MOL CELL CARDIOL
SN - 0022-2828
IS - 3
M1 - 3
ER -
