Cytosolic free [Mg2+] can be assessed in vivo by P-31-MRS from the chemical shift of beta-ATP. The reliability of in vivo measurements depends on the availability of appropriate in vitro calibration curves obtained by using solutions that mimic the in vivo cytosolic conditions as far as possible, We build a semi-empiric equation that correlates the chemical shift of beta-ATP to free [Mg2+] taking into account the amount of Mg2+ bound to all other ligands in solution. Our experiments resulted in a reliable ten-parameters equation directly usable to assess the cytosolic free [Mg2+] of human skeletal muscle at rest, during work and recovery. Our experiments also resulted in a new equation that allows the assessment of cytosolic pH from the chemical shift of Pi laking into account the measured free [Mg2+]. To perform simultaneous calculation of free [Mg2+] and pH in the skeletal muscle in different metabolic conditions we developed a specific software package available on Internet (http://www.unibo.it/bioclin) together with another program based on the equation previously obtained to calculate cytosolic free [Mg2+] in the human brain. The reliability and effectiveness of our equations and software were tested on the calf muscles of healthy volunteers at rest, during work and recovery. (C) 2000 Elsevier Science Inc. All rights reserved.

In vivo P-31-MRS assessment of cytosolic [Mg2+] in the human skeletal muscle in different metabolic conditions / S., Iotti; Frassineti, Chiara; L., Alderighi; A., Sabatini; A., Vacca; B., Barbiroli. - In: MAGNETIC RESONANCE IMAGING. - ISSN 0730-725X. - STAMPA. - 18:5(2000), pp. 607-614. [10.1016/S0730-725X(00)00132-6]

In vivo P-31-MRS assessment of cytosolic [Mg2+] in the human skeletal muscle in different metabolic conditions

FRASSINETI, Chiara;
2000

Abstract

Cytosolic free [Mg2+] can be assessed in vivo by P-31-MRS from the chemical shift of beta-ATP. The reliability of in vivo measurements depends on the availability of appropriate in vitro calibration curves obtained by using solutions that mimic the in vivo cytosolic conditions as far as possible, We build a semi-empiric equation that correlates the chemical shift of beta-ATP to free [Mg2+] taking into account the amount of Mg2+ bound to all other ligands in solution. Our experiments resulted in a reliable ten-parameters equation directly usable to assess the cytosolic free [Mg2+] of human skeletal muscle at rest, during work and recovery. Our experiments also resulted in a new equation that allows the assessment of cytosolic pH from the chemical shift of Pi laking into account the measured free [Mg2+]. To perform simultaneous calculation of free [Mg2+] and pH in the skeletal muscle in different metabolic conditions we developed a specific software package available on Internet (http://www.unibo.it/bioclin) together with another program based on the equation previously obtained to calculate cytosolic free [Mg2+] in the human brain. The reliability and effectiveness of our equations and software were tested on the calf muscles of healthy volunteers at rest, during work and recovery. (C) 2000 Elsevier Science Inc. All rights reserved.
2000
18
5
607
614
In vivo P-31-MRS assessment of cytosolic [Mg2+] in the human skeletal muscle in different metabolic conditions / S., Iotti; Frassineti, Chiara; L., Alderighi; A., Sabatini; A., Vacca; B., Barbiroli. - In: MAGNETIC RESONANCE IMAGING. - ISSN 0730-725X. - STAMPA. - 18:5(2000), pp. 607-614. [10.1016/S0730-725X(00)00132-6]
S., Iotti; Frassineti, Chiara; L., Alderighi; A., Sabatini; A., Vacca; B., Barbiroli
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/304269
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