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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 28:548-554, March 2007
© 2007 American Society of Neuroradiology

PEDIATRICS

Treatment Monitoring of Brain Creatine Deficiency Syndromes: A ¹H- and ³¹P-MR Spectroscopy Study

M.C. Bianchi^a,b, M. Tosetti^b, R. Battini^c, V. Leuzzi^e, M.G. Alessandri’^d, C. Carducci^f, I. Antonozzi^f and G. Cioni^c,d,e,f,g

^a Department of Neuroradiology, Santa Chiara Hospital, Pisa, Italy
^b Laboratory of Magnetic Resonance, IRCCS Stella Maris, Pisa, Italy
^c Department of Developmental Neuroscience, IRCCS Stella Maris, Pisa, Italy
^d Laboratory of Neurochemistry, IRCCS Stella Maris, Pisa, Italy
^e Department of Child Neurology and Psychiatry, University "La Sapienza," Roma, Italy
^f Department of Experimental Medicine and Pathology, University "La Sapienza," Roma, Italy
^g Department of Child Neurology and Psychiatry, University of Pisa, Pisa Italy

Address correspondence to Maria Cristina Bianchi, MR Laboratory, IRCCS Stella Maris, Viale del Tirreno 331, Calambrone 56018 Pisa, Italia; E-mail: mc.bianchi{at}inpe.unipi.it

BACKGROUND AND PURPOSE: Brain creatine (Cr) deficiencies (BCr-d) are rare disorders of creatine biosynthesis and transport. We performed consecutive measures of total Cr (tCr) and of its phosphorylated fraction, phosphocreatine (PCr), in the brains of children affected by Cr synthesis defects during a long period of therapy. The aim was to identify the optimal treatment strategy for these disorders.

MATERIALS AND METHODS: Two patients with guanidinoacetate methyltransferase defect (GAMT-d) were treated with different amounts of Cr and with diet restrictions aimed at reducing endogenous guanidinoacetate (GAA) synthesis. Three patients with arginine:glycine amidinotransferase defect (AGAT-d) were treated with different Cr intakes. The patients’ treatments were monitored by means of ¹H- and ³¹P-MR spectroscopy.

RESULTS: Cr and PCr replenishment was lower in GAMT-d than in AGAT-d even when GAMT-d therapy was carried out with a very high Cr intake. Cr and especially PCr replenishment became more efficient only when GAA blood values were reduced. Adenosine triphosphate (ATP) was increased in the baseline phosphorous spectrum of GAMT-d, and it returned to a normal value with treatment. Brain pH and brain P_i showed no significant change in the AGAT-d syndrome and at any Cr intake. However, 1 of the 2 GAMT-d patients manifested a lower brain pH level while consuming the GAA-lowering diet.

CONCLUSIONS: AGAT-d treatment needs lower Cr intake than GAMT-d. Cr supplementation in GAMT-d treatment should include diet restrictions aimed at reducing GAA concentration in body fluids. ¹H- and especially ³¹P-MR spectroscopy are the ideal tools for monitoring the therapy response to these disorders.

This article has been cited by other articles:

				M.C. Bianchi Reply: AJNR Am. J. Neuroradiol., February 1, 2008; 29(2): 214 - 214. [Full Text] [PDF]

				W.K.J. Renema, H.E. Kan, and A. Heerschap Is ATP Elevated in Patients With GAMT Deficiency? AJNR Am. J. Neuroradiol., February 1, 2008; 29(2): 214 - 214. [Full Text] [PDF]