Letter to the editor regarding the article “Serum paraoxonase-1 gene polymorphism and enzyme activity in patients with urolithiasis” (original) (raw)
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The association of metabolic syndrome and urolithiasis
International journal of endocrinology, 2015
There has been an increasing prevalence of kidney stones over the last 2 decades worldwide. Many studies have indicated a possible association between metabolic syndrome and kidney stone disease, particularly in overweight and obese patients. Many different definitions of metabolic syndrome have been suggested by various organizations, although the definition by the International Diabetes Federation (IDF) is universally considered as the most acceptable definition. The IDF definition revolves around 4 core components: obesity, dyslipidemia, hypertension, and diabetes mellitus. Several hypotheses have been proposed to explain the pathophysiology of urolithiasis resulting from metabolic syndrome, amongst which are the insulin resistance and Randall's plaque hypothesis. Similarly the pathophysiology of calcium and uric acid stone formation has been investigated to determine a connection between the two conditions. Studies have found many factors contributing to urolithiasis in pati...
Oxidative stress and antioxidant status in patients with complicated urolithiasis
Journal of Medicine and Life, 2016
In recent years, intense efforts have been made to clarify the pathogenesis of urolithiasis, which affects more than 10% of the population of developed countries. Currently, a number of studies have assumed a key role in the pathogenesis of oxalate urolithiasis, which is the most common one that belongs to the active forms of oxygen generated in the kidney, as a result of the activation of free radical oxidation that occurs in the interaction of calcium oxalate crystals with renal tubular epithelial cells. In the current work, oxidant and antioxidant status were assessed in the blood of patients with complicated urolithiasis pre - and post surgery. The surgical treatment of complicated urolithiasis leads a decrease of the oxidative stress and an increase in the potential of antiradical and antiperoxidative protection.
Clinica Chimica Acta, 2002
Background: Patients with chronic renal failure on maintenance haemodialysis (HD) are at high risk of atherothrombotic events; an enhanced oxidant stress might have a major role. The decrease of human paraoxonase (PON1), an anti-oxidant highdensity lipoprotein (HDL)-linked enzyme, is a possible mechanism for developing cardiovascular disease. To ascertain the causes of low PON1 in such patients, we investigated the contribution of both PON1 gene polymorphism and individual pattern of HDL. Methods: On 74 HD patients (47 M and 27 F) and on 92 healthy individuals (HS, 48 M and 44 F), we studied PON1 activity, PON1 genotype (55 and 192 PON1 allelic polymorphisms) and the lipid profile, including the HDL subfractions. Results: We observed in HD patients the following significant differences: (1) decreased median PON1 activity (73.5 vs. 110 U/ l); (2) decreased mean HDL concentration (1.05 F 0.18 vs. 1.55 F 0.41 mmol/l); (3) decreased mean HDL3 concentration (0.79 F 0.21 vs. 1.28 F 0.24 mmol/l). Total HDL retained about 70% of serum activity, almost completely carried (95%) by the HDL3. Finally, PON1 activity remained significantly low in HD vs. HS after matching for the allelic polymorphism. Conclusions: The reduction of the HDL3, not the genetic PON1 polymorphism, seems the most important determinant of PON1 activity reduction in HD. D 2002 Published by Elsevier Science B.V.
2009
Objective: To assess the role of lipid peroxidation and antioxidant enzymes in serum of urolithiasis patients. Methodology: Glutathione peroxidase (GPx), catalase (CAT) and malondialadehyde (MDA) in serum of urolithiasis patients have been measured. Results: The study has revealed a significant increase in MDA and a significant decrease in GPx and CAT. There have been no significant correlations of serum MDA, GPx and CAT to the size and number of stones with no differences in their levels among patients with one stone, two stones and multiple stones. Anatomically the distributions of urinary stones have been 70.14% renal, 19.30% uretric and 3.15% urinary bladder. There have been no significant difference in serum levels of neither MDA nor CAT among all the anatomical sites of the stone, while GPx has shown a significant difference in serum of patients with renal calyceal, renal pelvic, ureteric and vesical stones. Patients with recurrent episode of urinary stone have been 63.33%. Family histories of urolithiais have been negative in 73.33% of the patients. Neither recurrence of urinary stone nor family history of urolithiasis have shown a significant correlation with serum levels of MDA, GPx and CAT. Conclusion: The role of lipid peroxidation and antioxidant enzymes is present in the pathogenesis of urinary stone, but their levels don't affect by the size, the number and the anatomical position of stones (apart of GPx which has been affected by the anatomical position of the stone) and the duration, recurrence, and family history of the disease. Mahmoud RH, Ewadh MJ, Al-Hamadani KJ. Clinical Assessment of glutathione peroxidase and catalase to the status of malondialdehyde in urolithiasis. Pak J Med Sci 2009;25(5):738-743.
Polish Archives of Internal Medicine, 2014
INTROduCTION Cardiovascular diseases are still the most common cause of death in developed countries. 1 The atherosclerotic process involves several oxidative reactions such as the development of oxygen and peroxyl radicals and oxidation of low-density lipoprotein (LDL) cholesterol, which is an important target of free radicals in blood. 2 Oxidative burst is an innate immune response to infection, the latter being also associated with marked changes in lipid and lipoprotein metabolism, aimed at neutralizing the
OPN gene polymorphism (Ala250) and lower serum OPN levels are associated with urolithiasis
Renal Failure, 2013
Osteopontin (OPN) is one of the urinary proteins with an important role in stone formation. Recently, OPN Ala250 (rs1126616) polymorphism and other single nucleotide polymorphisms (SNPs) have been studied to define their role in urolithiasis. This study was conducted to examine the impact of OPN Ala250 polymorphism on the risk of stone formation and their association with serum OPN levels. OPN Ala250 polymorphism was investigated in 127 urolithiasis patients and 92 healthy controls. Stones were analyzed for their chemical composition by using X-Ray diffraction method. Genomic DNA was isolated from peripheral blood leucocytes. The study groups were genotyped by PCR-RFLP and serum OPN levels were measured by ELISA. There was a significant difference between urolithiasis patients and controls concerning genotype and allele frequencies of OPN Ala250 (p50.05). Separate analysis by BMI greater or less than 25 kg/m 2 showed that the presence of one mutant T-allele was more frequent in patients with higher BMI than patients with BMI less than 25 kg/m 2 (p50.05). Serum OPN concentrations were twofold higher in the control group compared to urolithiasis patients (p50.05). But the mean serum levels did not show any significant difference between OPN Ala250 genotypes in both groups. Moreover, we found an association between higher BMI and stone formation. Our findings suggest that OPN Ala250 polymorphism is associated with the correlation between weight gain and urolithiasis. However, the correlation between urolithiasis and obesity needs to be further studied in larger cohorts.
Journal of Pharmaceutical Research International, 2021
Background: Urolithiasis i.e. stone firming disease in the urinary passages is one of the frequently encountered diseases in man. Perhaps the disease is as ancient as the man himself as has been revealed by the archaeological excavation done in different parts of the world such as in Egypt. Aim: Comparative Study of Malondialdehyde, Superoxide Dismutase and Glutathione Peroxidase in Urolithiasis Patients: A Case Control Study Materials and Methods: The study was carried out in the Department of Biochemistry, Datta Meghe Medical College Nagpur in collaboration with Department of Surgery, Division of Urology and Department of Pharmacology. Results: The urolithiasis patients have shown a marked increase in plasma MDA levels. There was a significant increase in the values of superoxide dismutase in patients suffering from urolithiasis (6.26 ± 0.86 µmol/l RBC lysate) as compared to the normal control values (3.40 ± 1.09 µmol/l RBC lysate) in human volunteers (p<0.01).A significantly d...
Medical Science Monitor, 2018
Background: Fatty acids (FA) and their metabolites are closely related to some mechanisms involved in the development of uronephrolithiasis. The aim of this study was to evaluate the relationship between FA composition and type of kidney stones. Material/Methods: Abdominal adipose tissue fatty acid methyl esters of 71 men with nephrolithiasis were identified by GC/MS, and the type of kidney stones was identified using FTIR infrared spectroscopy. Patients were divided into groups according to diagnosis of metabolic syndrome (MS) and type of kidney stone. The composition of FA was compared within different groups of patients with different types of kidney stones and between the patients and healthy individuals (control group) (n=100). Results: Individuals with nephrolithiasis had a significantly higher level of monounsaturated fatty acids (MUFA) and a lower level of polyunsaturated fatty acids (PUFA) versus healthy individuals. Patients with MS had a higher level of 18: 1w9 and a lower level of 16: 1w7 than patients without MS. Individuals with nephrolithiasis, but without MS, had a higher level of saturated fatty acids (SFA) compared to controls. The level of PUFA was higher in the control group (p<0.0001) compared to individuals with uronephrolithiasis, with or without MS. PUFA, w-6 PUFA, and 18: 2w6 were higher in patients with calcium-based kidney stones without MS versus patients with uric acid kidney stones with MS. Conclusions: The levels of MUFA were significantly higher and the levels of PUFA were significantly lower in patients with uronephrolithiasis compared to controls.
Clinical Chemistry and Laboratory Medicine, 2000
Background: The mechanism of paraoxonase 1 (PON1) atheroprotective remains elusive. The lactonizing/lactonase activity of PON1 is gaining favor as the most significant in physiology. Methods: We studied 42 end-stage renal disease (ESRD) patients undergoing hemodialysis (HD) and 49 control subjects. We measured PON1 lactonase, arylesterase and triesterase activities by kinetic methods. Results: Serum lactonase activity was 11% lower in ESRD patients (p-0.0001) and did not correlate with high-density lipoprotein (HDL) cholesterol when controlling for confounders. Lactonase activity was significantly higher after dialysis. Using a repeated measure-ANOVA adjusted for the confounders (age, gender, total cholesterol, triglyceride and HDL cholesterol) we show that the changes in lactonase after dialysis were significant (p-0.0001). HD increases lactonase activity to levels indistinguishable from those of control subjects. In simple linear regression analyses we showed a significant inverse correlation between changes in lactonase and those of creatinine by dialysis (rs-0.339, ps0.028). Conclusions: ESRD patients maybe more susceptible to lipid peroxidation and to protein homocysteinylation than healthy subjects due to the decreased activity of lactonase. A lower serum lactonase activity would be coupled with delayed catabolism of oxidized phospholipids in low-density lipoprotein and oxidized macrophages, and with greater protein homocysteinylation, accelerating atherogenesis. One mechanism for lower lactonase activity in ESRD patients may be inhibition by uremic toxins and oxidative stress. The