Activation of the purine salvage pathway in mononuclear cells of cardiac recipients treated with mycophenolate mofetil.

Abstract:

BACKGROUND:The objective of this study was to investigate purine nucleotide metabolism in peripheral blood mononuclear cells (PBMC) of cardiac transplant recipients switched from azathioprine to mycophenolate mofetil (MMF). METHODS:Concentrations of guanosine 5'triphosphate (GTP) and adenosine 5'triphosphate (ATP), the activities of inosine monophosphate dehydrogenase (IMPDH), guanine phosphoribosyltransferase (GPRT), and hypoxanthine phosphoribosyltransferase (HPRT) were determined in PBMC of 27 cardiac transplant recipients before switch to MMF and 3, 6, and 12 months thereafter. RESULTS:There was no difference in the activities of IMPDH and salvage pathway enzymes GPRT and HRPT as well as in intracellular GTP and ATP concentrations between the patients before switch to MMF and healthy controls. The GTP and ATP concentrations in PBMC of cardiac recipients did not change during the entire observation period. Although the MPA trough level remained similar, IMPDH activity declined from 897 to 316 pmol/10(6)PBMC/h 3 months after MMF onset, was almost completely inhibited after 6 months, and partially restored to 143 pmol/10(6)PBMC/h 12 months after switch to MMF. In contrast, GPRT activity increased after 3, 6, and 12 months of MMF therapy and HPRT activity 3 and 6 months after switch to MMF. CONCLUSIONS:We demonstrated for the first time an induction of salvage pathway enzyme activities in PBMC under MMF therapy. This probably accounts for the maintenance of intracellular purine nucleotide pools and prevents the GTP depletion.

journal_name

Transplantation

journal_title

Transplantation

authors

Devyatko E,Zuckermann A,Bohdjalian A,Roedler S,Dunkler D,Grimm M,Weigel G

doi

10.1097/01.tp.0000225759.54343.23

subject

Has Abstract

pub_date

2006-07-15 00:00:00

pages

113-8

issue

1

eissn

0041-1337

issn

1534-6080

pii

00007890-200607150-00018

journal_volume

82

pub_type

临床试验,杂志文章
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    更新日期:2005-04-27 00:00:00

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    pub_type: 杂志文章

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    authors: Sánchez-Fructuoso AI,Prats D,Pérez-Contín MJ,Marques M,Torrente J,Conesa J,Grimalt J,Del Rio F,Núñez JR,Barrientos A

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    doi:10.1097/00007890-199310000-00038

    authors: Wang SC,Morel PA,Wang Q,Jordan ML,Simmons RL,Tweardy DJ

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