Asymmetric dimethylarginine is not elevated in exfoliation syndrome but symmetric dimethylarginine is related to exfoliative glaucoma

Increased oxidative stress and disturbance in nitric oxide bioavailability lead to endothelial dysfunction and cardiovascular complication in renal disease. Gentamicin (GM), a commonly used antibiotic, exhibits a toxic effect on renal proximal tubules. Prevention of its nephrotoxicity is important. Therefore, we investigated whether heme oxygenase 1 HO-1) induction influenced kidney and vascular function in GM-administered rats. GM (100 mg·kg–1·day–1; i.p.) was given to rats alone or together with hemin (20 mg·kg–1 on alternate days; i.p.) for 14 days. Plasma and kidney l-arginine, asymmetric dimethylarginine (ADMA), and symmetric dimethylarginine (SDMA) as well as kidney 4-hydroxynonenal (HNE) levels and myeloperoxidase (MPO) activity were measured. Histopathological examinations of kidney and relaxation and contraction responses of aorta were also examined. GM increased serum SDMA, urea nitrogen (BUN), and creatinine levels and caused histopathological alterations in the kidney. GM elevated HO-1 protein and mRNA expressions, 4-HNE level, and MPO activity and decreased antioxidant enzyme activities and l-arginine levels in the kidney. Decreased relaxation and contraction were detected in the aorta. Hemin restored renal oxidative stress and inflammatory changes together with vascular dysfunction, but did not affect SDMA, BUN, or creatinine levels. We conclude that HO-1 induction may be effective in improving renal oxidative stress, inflammation, and vascular dysfunction mediated by GM.

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Intraocular Pressure Characteristics of Exfoliative Glaucoma and Exfoliation Syndrome as Determined With the Water Drinking Test

Journal of Glaucoma ◽

10.1097/ijg.0000000000000223 ◽

2016 ◽

Vol 25 (3) ◽

pp. 301-305 ◽

Cited By ~ 6

Author(s):

Mehmet C. Mocan ◽

Burcu Kasim ◽

Ersin Muz ◽

Murat Irkec ◽

Mehmet Orhan ◽

...

Keyword(s):

Intraocular Pressure ◽

Exfoliation Syndrome ◽

Water Drinking ◽

Exfoliative Glaucoma ◽

Drinking Test ◽

Water Drinking Test ◽

Pressure Characteristics

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EXFOLIATION SYNDROME 365.52 (Pseudoexfoliation Syndrome, Pseudoexfoliation Glaucoma, Exfoliative Glaucoma, Capsular Glaucoma)

Roy and Fraunfelder's Current Ocular Therapy ◽

10.1016/b978-1-4160-2447-7.50265-6 ◽

2008 ◽

pp. 481-483

Author(s):

Andrew G. Iwach ◽

Ümit Aykan ◽

H. Dunbar Hoskins

Keyword(s):

Pseudoexfoliation Syndrome ◽

Exfoliation Syndrome ◽

Pseudoexfoliation Glaucoma ◽

Exfoliative Glaucoma ◽

Capsular Glaucoma

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Increased Serum Levels of Asymmetric Dimethylarginine and Symmetric Dimethylarginine and Decreased Levels of Arginine in Sudanese Patients with Essential Hypertension

Kidney & Blood Pressure Research ◽

10.1159/000508695 ◽

2020 ◽

Vol 45 (5) ◽

pp. 727-736

Author(s):

Sahar Gamil ◽

Jeanette Erdmann ◽

Edzard Schwedhelm ◽

Khalid Hussein Bakheit ◽

Ihab B.B. Abdalrahman ◽

...

Keyword(s):

Logistic Regression ◽

Regression Analysis ◽

Essential Hypertension ◽

Amino Acid ◽

Asymmetric Dimethylarginine ◽

Multivariate Logistic Regression Analysis ◽

Serum Levels ◽

Control Group ◽

Multivariate Logistic Regression ◽

Symmetric Dimethylarginine

Introduction: Essential hypertension (EH) is a disease caused by various environmental and genetic factors. Nitric oxide (NO) is important for the functional integrity of the endothelium. It is produced in endothelial cells by endothelial NO synthase (eNOS) that mediates the conversion of the amino acid arginine into NO and citrulline. Asymmetric dimethylarginine (ADMA) acts as an inhibitor of eNOS. In contrast, symmetric dimethylarginine (SDMA) has no direct effect on eNOS but plays an important role competing with arginine for transport across the amino acid transporter. ADMA and SDMA have been found to play a central role in the development of cardiovascular diseases. Serum ADMA levels may serve as a future diagnostic marker and a target of therapy in hypertensive patients in the Sudanese population. This study aimed to investigate the relation between serum arginine, ADMA, and SDMA levels with EH in the Sudanese population. Methods: Patients (n = 260) with established hypertension and controls (n = 144) with normal blood pressure were included in this case-control study. Serum blood samples were analyzed for arginine, ADMA, and SDMA, using high-performance liquid chromatography-tandem mass spectrometry. Other laboratory data were measured using routine methods. Mann-Whitney’s U test and χ2 tests were used for continuous and categorical data, respectively. A multivariate logistic regression analysis was conducted to investigate the independent effect of multiple variables on the development of hypertension. Results: Serum arginine levels were significantly lower in the patient group than in the control group (p < 0.001). ADMA and SDMA levels were significantly higher in the patient group than the control group (p < 0.001, p = 0.001, respectively). Multivariate logistic regression analysis showed that only older age, being a male, and arginine levels are independent factors controlling the development of hypertension (p < 0.001, p < 0.001, and p = 0.046, respectively). ADMA and SDMA levels were not independent factors for the development of hypertension. Conclusions: This study demonstrated increased serum levels of ADMA and SDMA and decreased arginine levels in Sudanese patients with EH. Lowering serum ADMA levels or increasing the arginine levels might be a novel therapeutic target in these individuals.

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Asymmetric Dimethylarginine (ADMA) and Symmetric Dimethylarginine (SDMA) Concentrations in Patients with Obesity and the Risk of Obstructive Sleep Apnea (OSA)

Journal of Clinical Medicine ◽

10.3390/jcm8060897 ◽

2019 ◽

Vol 8 (6) ◽

pp. 897 ◽

Cited By ~ 4

Author(s):

Yana Arlouskaya ◽

Ada Sawicka ◽

Marek Głowala ◽

Joanna Giebułtowicz ◽

Natalia Korytowska ◽

...

Keyword(s):

Nitric Oxide ◽

Obstructive Sleep Apnea ◽

Sleep Apnea ◽

Asymmetric Dimethylarginine ◽

Apnea Hypopnea Index ◽

Enos Gene ◽

No Production ◽

Serum Concentrations ◽

Symmetric Dimethylarginine ◽

Obstructive Sleep

Asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) are endogenous inhibitors of nitric oxide (NO) synthesis, and play a critical role in the process of endothelial dysfunction, and are considered markers of oxidative stress. The aim of the present study was to explore relationships between ADMA and/or SDMA and the occurrence of OSA in obese patients as well as the effect of the endothelial nitric oxide synthase (eNOS) gene polymorphism, which may modify the influence of ADMA or SDMA on NO production. A total of 518 unrelated obese subjects were included in this study. Body weight, height and blood pressure were measured and data on self-reported smoking status were collected. Obstructive sleep apnea (OSA) was assessed by the apnea hypopnea index (AHI). Blood samples were collected to measure serum concentrations of glucose, total cholesterol, LDL-cholesterol, HDL-cholesterol, triglycerides, creatinine, HbA1c (%), folic acid, vitamin B12, C-reactive protein (CRP), aspartate aminotransferase (ASP), alanine aminotransferase (ALT) and IL-6 by routine methods. The NOS3 gene G894T and 4a/4b polymorphisms were detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. ADMA, SDMA and arginine concentrations were assessed simultaneously using liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method. Adjusted multivariate logistic regression analysis showed a significant association between the occurrence of OSA and high serum ADMA levels, BMI above 40, age > 43 years, hypertension and male sex. Heterozygotes for the G894T eNOS polymorphism have the lowest serum concentrations of ADMA and SDMA, while no effect of the 4a/4b variants was observed. The results indicate that OSA in obese individuals can coexist with high ADMA levels, which appear as a potential OSA predictor.

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Changes in Visual Acuity and Refraction in the Exfoliation Syndrome. A Five-Year Follow-up Study

European Journal of Ophthalmology ◽

10.1177/112067210101100306 ◽

2001 ◽

Vol 11 (3) ◽

pp. 245-251 ◽

Cited By ~ 2

Author(s):

P.M. Puska ◽

A.H.A. Tarkkanen

Keyword(s):

Visual Acuity ◽

Main Type ◽

Exfoliation Syndrome ◽

Follow Up Study ◽

Exfoliative Glaucoma ◽

The Difference ◽

Term Management ◽

Fellow Eyes

Purpose To examine changes in visual acuity (VA) and refraction in non-glaucomatous patients with unilateral exfoliation syndrome (EXS). Methods The best corrected values for VA (Snellen acuity cards) subjectively adjusted for refraction, and IOP were measured, and the development of lens opacities was examined in 46 non-glaucomatous patients with unilateral EXS. Results After five years the rate of conversion to bilateral exfoliation was 22% and to exfoliative glaucoma 30%. There was a significant decrease in VA in the exfoliative (E) eyes (median; QI, QIII, range: 1; 0.8, 1, 0.4-1.3 vs. 0.55; 0.4, 1, 0.05-1.4, p<0.0001) and the fellow, initially non-exfoliative (NE), eyes (1; 0.9, 1, 0.3–1.3 vs. 0.7; 0.5, 0.9, 0.1–1.4, p<0.0001) and a significant myopic change in refraction in the E eyes (+1.02 ± 2.48 vs. +0.11 ± 3.06, p=0.0001) and the NE eyes (+0.99 ± 2.25 vs. +0.43 ± 2.55 D, p<0.01). At study entry the difference in refraction between the fellow eyes (refraction in the NE eye – refraction in the E eye) was −0.27 ± 1.00D. After five years it was +0.32 ± 1.44 (p 0.016), reflecting greater myopic changes in the E eyes. The main type of lens opacification was nuclear sclerosis. Conclusions In five years, significant decreases in VA and myopic shifts in refraction occurred in the E and fellow eyes. The E eyes showed significantly greater myopic changes than the fellow eyes; the cause was clearly nuclear sclerosis, which must be taken into account in the long-term management of patients with EXS.

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