2007, Number 1
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Rev Inst Nal Enf Resp Mex 2007; 20 (1)
Direct correlation between FEF25-75 and plasmatic paraoxonase activity in adult patients with asthma
Sierra VMP, Fernández VM, Torres RJD, Hicks GJJ
Language: Spanish
References: 24
Page: 9-14
PDF size: 116.26 Kb.
ABSTRACT
Introduction: Plasma myeloperoxidase activity (MPO) (EC 1.11.1.7) has been related to several chronic-degenerative diseases such as asthma, which have in common a chronic inflammatory process. Paraoxonase (PON-1) (EC 3.1.1.2), is an arylesterase enzyme that has a hydroperoxide catalytic function. This enzyme is a component of APO A-I located in HDL. PON1 is has been considered to protect lipoproteins, because it interrupts the oxidation process of LDL, conducive to the atherosclerotic process.
Objectives: To demonstrate that, a) oxidative stress in asthmatic patients correlates with the MPO activity, and b) demonstrate the role of PON1 activity as a biomarker of their pulmonary function.
Methods: The activity of both enzymes was measured in plasma of patients with asthma and compared to a control group of healthy subjects.
Results: In the group of patients with asthma, MPO activity increased 42% (57.31 ± 7.2 U
vs 33.34 ± 4.7 U p‹0.05), while PON-1 activity decreased 52% (0.09 ± 0.1 nmol p-nitrophenol/mg prot
vs 0.05 ± 0.01 nmol p-nitrophenol/mg prot p‹0.01). MPO activity showed an inverse correlation with FEV
1 with a Spearman r of -0.57, while PON-1 activiy showed a direct correlation with FEF
25-75, Spearman r of 0.64.
Conclusions: In this study we show, for the first time, that asthma patients, in whom there is a state of oxidative stress that affects the pulmonary function, PON-1 determination can be useful as a predictor of a better pulmonary function, whereas an increment in MPO activity could be associated to an acute inflammatory process, implicating cellular damage.
* U = U/mg of protein
-1.
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