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Khan J, Shaw S. Risk of cataract and glaucoma among older persons with diabetes in India: a cross-sectional study based on LASI, Wave-1. Sci Rep 2023; 13:11973. [PMID: 37488196 PMCID: PMC10366202 DOI: 10.1038/s41598-023-38229-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 07/05/2023] [Indexed: 07/26/2023] Open
Abstract
According to the International Diabetes Federation-2019 estimates, India is home to 77 million diabetic individuals which is projected to grow up to 147.2 million by 2045. Diabetes being a progressive health disorder leads to multiple morbidities and complications including eye diseases and visual impairments. As the burden of diabetes mellitus is increasing, eye problems like cataracts and glaucoma are commonly cited problems among the older adults. In this context, this study aims to provide the public health evidences on diabetes associated burden and risk of developing cataracts and glaucoma among older adults aged 60 and above in India. The analytical sample of this cross-sectional study comprised of 31,464 individuals aged 60 and above. Bivariate cross-tabulation and chi-square test were performed to understand the differential in the prevalence of cataracts and glaucoma by diabetes mellitus including the socio-economic and demographic characteristics of the individuals. Binary logistic regression estimation was executed to estimate the adjusted odds ratio for each of the outcome variables within a multivariate framework. The cataract problem affects more than one-fifth of the older people, while glaucoma affects 2% of them. The prevalence of cataract and glaucoma is 29% among diabetic older adults compared to 22% among non-diabetic persons. In terms of gender, the cataract prevalence is comparatively higher among females (25%) than males (21%). It is important to note that while adjusting for socio-economic and demographic characteristics, the likelihood of cataract (AOR 1.495; p-value < 0.01) and glaucoma (AOR 1.554; p-value < 0.01) is significantly higher among older adults with diabetes than among their counterparts. Medical practitioners should conduct prognosis for diabetic eye problems among patients and raise awareness about the potential risks of developing vision loss, such as cataracts and glaucoma, which are more prevalent among individuals with diabetes.
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Affiliation(s)
- Junaid Khan
- Department of Population and Development, International Institute for Population Sciences, Mumbai, India
| | - Subhojit Shaw
- Department of Population and Development, International Institute for Population Sciences, Mumbai, India.
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Ziegler D, Reiners K, Strom A, Obeid R. Association between diabetes and thiamine status - A systematic review and meta-analysis. Metabolism 2023; 144:155565. [PMID: 37094704 DOI: 10.1016/j.metabol.2023.155565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 04/26/2023]
Abstract
BACKGROUND Thiamine (vitamin B1) is an essential cofactor in glucose metabolism, but it remains unclear whether thiamine status is lower in individuals with diabetes compared to individuals with normal glucose metabolism. AIMS We conducted a systematic review and meta-analysis to study whether the circulating concentrations of various thiamine analytes differ between people with and those without diabetes. METHODS PubMed and the Cochrane Central Register of Controlled Trials were searched according to the study protocol. The standardized mean difference (SMD) and 95 % confidence intervals (CI) of thiamine markers between individuals with and without diabetes were used as effect size (random effects model). Subgroup analysis considered albuminuria as an additional variable. RESULTS Out of the 459 articles identified, 24 full-texts were eligible for the systematic review, 20 of which qualified for the data analysis and four were evaluated for coherence. Compared to controls, individuals with diabetes showed lower concentrations of thiamine (pooled estimate SMD [95 % CI]: -0.97 [-1.89, -0.06]), thiamine monophosphate (-1.16 [-1.82, -0.50]), and total thiamine compounds (-1.01 [-1.48, -0.54]). Thiamine diphosphate (-0.72 [-1.54, 0.11] and erythrocyte transketolase activity (-0.42 [-0.90, 0.05]) tended to be lower in persons with diabetes than in controls without reaching statistical significance. Subgroup analysis showed that individuals with diabetes and albuminuria had lower thiamine levels than the controls (-2.68 [-5.34, -0.02]). CONCLUSIONS Diabetes is associated with lower levels of various thiamine markers, suggesting that individuals with diabetes may have higher thiamine requirements than those without diabetes, but well-designed studies are required to confirm these findings.
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Affiliation(s)
- Dan Ziegler
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, D-40225 Düsseldorf, Germany.
| | | | - Alexander Strom
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, D-40225 Düsseldorf, Germany
| | - Rima Obeid
- Department of Clinical Chemistry and Laboratory Medicine, Saarland University Hospital, D-66421 Homburg, Saar, Germany
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Fani A, Sofia K, Theodora P, Antonia S. Pseudoexfoliation syndrome in diabetic patients: transmission electron microscopy study of anterior lens epithelial cells. Rom J Ophthalmol 2021; 65:38-45. [PMID: 33817432 PMCID: PMC7995516 DOI: 10.22336/rjo.2021.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Purpose: to examine the lens epithelial cells in diabetic patients with pseudoexfoliation to ultramicroscope and to compare the findings with those of patients without diabetes mellitus (DM) and/or without pseudoexfoliation (PEX). Materials and Methods: Forty patients aged 65-86 years were enrolled in the study. All patients had senile cataract and were divided into four groups of ten patients in each group. Group I: patients without pseudoexfoliation, without DM, Group II: without pseudoexfoliation, with DM, Group III: with pseudoexfoliation, without DM, Group IV (Pseudoexfoliation-Diabetic Group): with pseudoexfoliation, with DM. In all cases, part of the central portion of anterior lens capsule was removed during routine cataract surgery, and was properly prepared in order to be examined under a transmission electron microscope. Results: In the control group, mainly degenerative alterations to varying extents were observed. In all groups, intracellular and extracellular oedema, multilayering, apoptosis, completely destroyed cells adjacent to normal cellswere described. In the diabetic group, alterations were more severe with respect to group I. In PEX cases, the additionalirregularity of the epithelium surface, loose intercellular connection, as well as the loose connection between cells and basement membrane were described with the presence of PEX material free and within the basement membrane. In cases with PEX and DM, degenerative alterations and PEX material were observed as well, but the epithelium was better conserved compared to the PEX group. Conclusion: the observed lesions were more extended and more frequent in the pseudoexfoliation group, followed by the diabetic group. The pseudoexfoliation-diabetic group presented less intense modifications raising questions about the interaction of these different diseases. Abbreviations: DM = Diabetes Mellitus, PEX = Pseudoexfoliation, PXM = Pseudoexfoliative Material, AD = Alzheimer disease, TGF-β1 = Transforming Growth Factor beta 1, WHO = World Health Organization, LEC = Lens Epithelium Cells, BM = Basement Membrane, CM = Cytoplasmic Membrane
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Affiliation(s)
- Akritidou Fani
- Department of Ophthalmology, General Hospital of Serres, Serres, Greece
| | | | - Papamitsou Theodora
- Laboratory of Histology-Embryology, Department of Medicine, School of Health Sciences, AUTH (Aristotle University of Thessaloniki), Thessaloniki, Greece
| | - Sioga Antonia
- Laboratory of Histology-Embryology, Department of Medicine, School of Health Sciences, AUTH (Aristotle University of Thessaloniki), Thessaloniki, Greece
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Iqbal WA, Mendes I, Finney K, Oxley A, Lietz G. Reduced plasma carotenoids in individuals suffering from metabolic diseases with disturbances in lipid metabolism: a systematic review and meta-analysis of observational studies. Int J Food Sci Nutr 2021; 72:879-891. [PMID: 33586569 DOI: 10.1080/09637486.2021.1882962] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
This review summarises the association between serum carotenoids, serum retinoids and dietary intake outcomes with obesity/overweight and individuals with metabolic diseases with disturbances in lipid metabolism. Observational studies reporting dietary intakes and serum concentrations of carotenoids and retinol were collected from Medline and Web of Science. Mean differences were calculated between "cases" (classified as obese, overweight or having a metabolic disease with disturbances in lipid metabolism; i.e. non-alcoholic fatty liver disease, type 2 diabetes, dyslipidaemia or metabolic syndrome) and "comparator group" (classified as normal weight healthy individuals) and summarised in meta-analyses. Significant summary measures were observed for most serum provitamin A and non-provitamin A carotenoids. Studies reporting total serum carotenoids had shown the greatest decrease (-0.28 µmol/l [-0.33, -0.23], p<.001, I2=62.5%, n = 7). There were no significant summary measures for dietary outcomes, suggesting a physiological role of low serum carotenoids in the development of obesity and associated diseases.
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Affiliation(s)
- Wasim A Iqbal
- Plant and Microbe Group, School of Natural and Environmental Sciences, Newcastle University, Newcastle Upon Tyne, UK
| | - Ines Mendes
- Endocrinology and Nutrition Service, Divino Espírito Santo Hospital, Ponta Delgada, Portugal
| | - Kieran Finney
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle Upon Tyne, UK
| | - Anthony Oxley
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle Upon Tyne, UK
| | - Georg Lietz
- Human Nutrition Research Centre, Population Health Sciences Institute, Newcastle University, Newcastle Upon Tyne, UK
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Aziz F, AlHazmi A, Aljameil N, Mahmood I, Tabassum H, Mushfiq S, Hijazy S. Serum Selenium and Lead Levels: a Possible Link with Diabetes and Associated Proteinuria. Biol Trace Elem Res 2020; 193:342-347. [PMID: 31004272 DOI: 10.1007/s12011-019-01721-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 04/05/2019] [Indexed: 12/18/2022]
Abstract
The study assessed trace element selenium (Se) and a heavy metal lead (Pb) in patients with type II diabetes mellitus (T2DM) and its associated proteinuria. Total 275 subjects aged between 30 and 90 years were studied: 93 T2DM, 98 T2DM with proteinuria, and 84 as controls. Serum Se and Pb were analyzed by inductively coupled plasma optical emission spectrometer (ICP-OES) and other biochemical indices by ROCHE module COBAS 6000 analyzer. Statistical analysis was done by one-way analysis of variance (ANOVA) at P < 0.0001 followed by Tukey's honest test. Pearson's correlation coefficient was applied to observe the effects of Se and Pb on FPG and ACR. Decreased Se levels were observed in T2DM and T2DM with proteinuria with no significant difference and serum Pb was found within reference range in both groups. Se showed no significant association with FBG and ACR while mid-upper tertile of Pb was significantly associated with ACR of T2DM with the proteinuria group (P < 0.01). Se is known to have a U-shaped relationship with T2DM. Low Se levels in both groups may be due to the effect of disease and its related inflammation. Detected levels of Pb suggest that studied population had lower exposure to it. Association of Pb with ACR showed consistency with the classical studies that even low levels of Pb may cause the renal deterioration.
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Affiliation(s)
- Farah Aziz
- King Khalid University, Abha, Kingdom of Saudi Arabia.
| | - Amani AlHazmi
- King Khalid University, Abha, Kingdom of Saudi Arabia
| | | | - Iram Mahmood
- King Khalid University, Abha, Kingdom of Saudi Arabia
| | | | | | - Serene Hijazy
- King Abdul Aziz University Hospital, Riyadh, Kingdom of Saudi Arabia
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Elmazar HM, Elmadbouh I, Mandour SS, Al Ariny GM, Ibrahim AM. Association between cataract progression and ischemia-modified albumin in relation to oxidant-antioxidant profiles in the serum, aqueous humor, and lens. J Cataract Refract Surg 2018; 44:134-139. [PMID: 29587970 DOI: 10.1016/j.jcrs.2017.10.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 09/19/2017] [Accepted: 10/23/2017] [Indexed: 10/17/2022]
Abstract
PURPOSE To evaluate the levels of ischemia-modified albumin (IMA) in relation to oxidant-antioxidant profiles in the serum, aqueous, and lens in cataract patients. SETTING Department of Ophthalmology, Menoufia University, Shebin El Kom, Menoufia, Egypt. DESIGN Prospective case series. METHODS Patients were divided into 2 groups. The cataract (study) group comprised patients with senile cataract and the control group, age- and sex-matched healthy persons. Patients with systemic disease or cataract formation secondary to identifiable causes were excluded. In all cases, a complete history was taken and a clinical examination was performed. In the cataract group, the lens was examined, and the cataract type and severity were graded. Blood levels of catalase, malondialdehyde (MDA), superoxide dismutase (SOD), and IMA were measured in all participants and in the aqueous and lens lysate of cataract patients. RESULTS Each group comprised 30 participants. Cataract patients had significant higher levels of serum MDA and IMA than the control group but had lower levels of serum catalase and SOD. Patients with cortical cataracts had higher level of serum IMA, aqueous catalase, and SOD levels patients with nuclear cataracts but had a lower level of lens SOD. There was a significant positive correlation between serum MDA and the patient's age and serum catalase levels. CONCLUSION Patients with cortical cataract had increased local oxidative stress and diminished antioxidant activity compared with systemic oxidative activity, which was not the same in patients with nuclear cataract.
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Affiliation(s)
- Hesham M Elmazar
- From the Department of Ophthalmology (Elmazar, Mandour, Al Ariny, Ibrahim) and the Department of Medical Biochemistry (Elmadbouh), Menoufia Faculty of Medicine, Shebin El Kom, Menoufia, Egypt.
| | - Ibrahim Elmadbouh
- From the Department of Ophthalmology (Elmazar, Mandour, Al Ariny, Ibrahim) and the Department of Medical Biochemistry (Elmadbouh), Menoufia Faculty of Medicine, Shebin El Kom, Menoufia, Egypt
| | - Sameh S Mandour
- From the Department of Ophthalmology (Elmazar, Mandour, Al Ariny, Ibrahim) and the Department of Medical Biochemistry (Elmadbouh), Menoufia Faculty of Medicine, Shebin El Kom, Menoufia, Egypt
| | - Gehad M Al Ariny
- From the Department of Ophthalmology (Elmazar, Mandour, Al Ariny, Ibrahim) and the Department of Medical Biochemistry (Elmadbouh), Menoufia Faculty of Medicine, Shebin El Kom, Menoufia, Egypt
| | - Asmaa M Ibrahim
- From the Department of Ophthalmology (Elmazar, Mandour, Al Ariny, Ibrahim) and the Department of Medical Biochemistry (Elmadbouh), Menoufia Faculty of Medicine, Shebin El Kom, Menoufia, Egypt
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Nagai N, Yamamoto T, Mitamura K, Taga A. Proteomic profile of the lens in a streptozotocin-induced diabetic rat model using shotgun proteomics. Biomed Rep 2017; 7:445-450. [PMID: 29181156 DOI: 10.3892/br.2017.988] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 09/14/2017] [Indexed: 01/09/2023] Open
Abstract
Streptozotocin (STZ)-induced diabetic rats (STZ rats) were used to investigate diabetic cataracts. In the current study, a shotgun liquid chromatography (LC)/mass spectrometry (MS)-based global proteomic analysis method was used to examine the mechanism of lens opacification as a result of hyperglycemia in STZ rats. The 6-week old Wistar rats were injected with STZ for 2 days (100 mg/kg/day, i.p.) and housed for 3 weeks. The plasma glucose levels were identified to be significantly higher when compared with the normal rats and insulin was not detected in the STZ rats. Furthermore, opacification of the cortical epithelium was observed in the lenses of STZ rats. A total of 235 proteins were identified in the lenses of the STZ rats and 229 in the lenses of the normal rats. A label-free semi-quantitative method, based on spectral counting, identified 52 proteins that were differentially expressed in the lenses of STZ rats compared with normal rats. In particular, superoxide dismutase, which is a critical antioxidant enzyme that detoxifies superoxide through redox cycling, was downregulated when analyzed by the semi-quantitative method. In addition, phosphorylated-p38, which is important in the signaling pathway involved in the oxidative stress response, was significantly increased in the lenses of STZ rats when compared with normal rats (P<0.05). Thus, the changes in protein expression were evaluated in the lenses of STZ rats using a shotgun LC/MS-based global proteomic analysis approach, and a decrease in antioxidant enzymes and an increase in oxidative stress were identified in the lenses of STZ rats. Further studies are required to examine the role of these proteins in the onset or progression of diabetic cataracts.
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Affiliation(s)
- Noriaki Nagai
- Department of Advanced Design for Pharmaceuticals, Faculty of Pharmacy, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Tetsushi Yamamoto
- Pathological and Biomolecule Analyses Laboratory, Faculty of Pharmacy, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Kuniko Mitamura
- Pathological and Biomolecule Analyses Laboratory, Faculty of Pharmacy, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Atsushi Taga
- Pathological and Biomolecule Analyses Laboratory, Faculty of Pharmacy, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
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Wang XL, Yang TB, Wei J, Lei GH, Zeng C. Association between serum selenium level and type 2 diabetes mellitus: a non-linear dose-response meta-analysis of observational studies. Nutr J 2016; 15:48. [PMID: 27142520 PMCID: PMC4855440 DOI: 10.1186/s12937-016-0169-6] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 04/26/2016] [Indexed: 12/14/2022] Open
Abstract
Background The association between serum selenium levels and type 2 diabetes mellitus (T2DM) is controversial. We performed a systematic review and non-linear dose–response meta-analysis of observational studies to investigate the association in the present study. Methods A comprehensive literature search was conducted using MEDLINE and EMBASE databases. A pooled odds ratio (OR) and related 95 % confidence interval (95 % CI) for T2DM between the highest and lowest serum selenium categories, and a non-linear dose–response relationship between selenium and T2DM were estimated. Results A total of five studies (of 13,460 participants) were identified as meeting the inclusion criteria. The pooled OR indicated that there was a significantly higher prevalence of T2DM in the highest category of blood selenium compared with the lowest (OR = 1.63, 95 % CI: 1.04–2.56, P = 0.033). Moreover, a significant non-linear dose–response relationship was observed between serum selenium levels and T2DM (P < 0.001). Serum selenium levels were positively associated with T2DM in populations with relatively low serum selenium levels (<97.5 μg/l) and those with high serum selenium levels (>132.5 μg/l). Conclusions The positive association between serum selenium levels and T2DM existed in populations with relatively low levels and high levels of serum selenium, indicating a likely U-shaped non-linear dose–response relationship between serum selenium and T2DM. Electronic supplementary material The online version of this article (doi:10.1186/s12937-016-0169-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xin-Liang Wang
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, 410008, Hunan Province, China
| | - Tu-Bao Yang
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, 410008, Hunan Province, China.
| | - Jie Wei
- Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, 410008, Hunan Province, China. .,Health Management Center, Xiangya Hospital, Central South University, Changsha, 410008, Hunan Province, China.
| | - Guang-Hua Lei
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, Hunan Province, China
| | - Chao Zeng
- Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, 410008, Hunan Province, China
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Sayin N, Kara N, Pekel G. Ocular complications of diabetes mellitus. World J Diabetes 2015; 6:92-108. [PMID: 25685281 PMCID: PMC4317321 DOI: 10.4239/wjd.v6.i1.92] [Citation(s) in RCA: 167] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 10/06/2014] [Accepted: 12/10/2014] [Indexed: 02/05/2023] Open
Abstract
Diabetes mellitus (DM) is a important health problem that induces ernestful complications and it causes significant morbidity owing to specific microvascular complications such as, retinopathy, nephropathy and neuropathy, and macrovascular complications such as, ischaemic heart disease, and peripheral vasculopathy. It can affect children, young people and adults and is becoming more common. Ocular complications associated with DM are progressive and rapidly becoming the world’s most significant cause of morbidity and are preventable with early detection and timely treatment. This review provides an overview of five main ocular complications associated with DM, diabetic retinopathy and papillopathy, cataract, glaucoma, and ocular surface diseases.
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Chien KH, Chen SJ, Liu JH, Chang HM, Woung LC, Liang CM, Chen JT, Lin TJ, Chiou SH, Peng CH. Correlation between microRNA-34a levels and lens opacity severity in age-related cataracts. Eye (Lond) 2013; 27:883-8. [PMID: 23661155 DOI: 10.1038/eye.2013.90] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 03/20/2013] [Indexed: 02/07/2023] Open
Abstract
PURPOSE MicroRNA 34a (miR-34a) is involved in regulating tissue senescence. However, the role of miR-34a in age-related cataracts is unclear. In this study, we evaluated the correlations among the severity of lens opacity, patient age, and miR-34a expression level in the lens epithelium of age-related cataracts for clarifying the role of miR-34a in the lens senescence. METHODS This study was carried as a case control study in the Department of Ophthalmology, Taipei Veterans General Hospital, Taiwan. We recorded age of each patient at the time of their cataract surgery and information regarding lens opacity according to a modified version of the Lens Opacities Classification System III. Correlations among age, lens opacity, and miR-34a expression levels were evaluated. RESULTS This study evaluated 110 patients with a mean age of 73.19 years (SD±10.2). Older patients had higher nuclear cataract (NC), cortical (C), and posterior subcapsular cataract (P) scores (one-way analysis of variance (ANOVA), P<0.05). miR-34a expression levels were significantly different between each age group (ANOVA post hoc Bonferroni's test, P<0.001), and there were moderate correlations between high NC, C, and P cataract scores and high miR-34a levels (Pearson correlation coefficient; R=0.606, 0.575, and 0.515, respectively). CONCLUSIONS The current study demonstrated positive correlations between high miR-34a levels and high lens opacity severity in NC, C, or P cataracts. These results suggest that miR-34a expression has a role in lens senescence.
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Affiliation(s)
- K-H Chien
- Department of Ophthalmology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
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Miric DJ, Kisic BB, Zoric LD, Mitic RV, Miric BM, Dragojevic IM. Xanthine oxidase and lens oxidative stress markers in diabetic and senile cataract patients. J Diabetes Complications 2013; 27:171-6. [PMID: 23142692 DOI: 10.1016/j.jdiacomp.2012.09.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 09/06/2012] [Accepted: 09/11/2012] [Indexed: 12/11/2022]
Abstract
Xanthine oxidase (XOD) is a prooxidant enzyme possibly implicated in diabetic lens injury and genesis of senile cataract (SC). We evaluated the impact of diabetes on XOD activity and its relationships with lens oxidative stress markers in patients operated on for SC. Serum and lens XOD activities, lens malondialdehyde (MDA), conjugated dienes, superoxide dismutase (SOD), glutathione peroxidase (GPx) and reduced glutathione (GSH) levels were measured in 62 non-diabetic and 29 diabetic patients operated on for SC. Lens XOD, SOD, GPx and GSH levels were gradually declining, while MDA and serum XOD were increasing with patient's age. Lens XOD activity was positively correlated with conjugated dienes concentration (rho=0.316; p=0.003) while being inversely correlated with age (rho=-0.371; p<0.001), indicating that low ocular expression of XOD could be related to lower intensity of oxidative stress and delayed occurrence of SC. When samples were adjusted for confounding factors, serum XOD (p<0.001), lens XOD (p=0.003) and conjugated dienes (p=0.002) were significantly higher in diabetic than in non-diabetic group. Lens SOD and GPx were moderately increased while MDA and GSH were unchanged in diabetic, compared with non-diabetic SC group. Blood HbA1C concentration was positively correlated with lens XOD (rho=0.346; p<0.001) as well as serum XOD activity (rho=0.485; p<0.001). These results suggest that poor glycemic control may upregulate systemic and ocular XOD activities contributing to lens oxidative stress and possibly to earlier onset of cataract.
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Affiliation(s)
- Dijana J Miric
- Institute of Biochemistry, Medical Faculty, Kosovska Mitrovica, Serbia.
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Role of zinc along with ascorbic acid and folic acid during long-term in vitro albumin glycation. Br J Nutr 2009; 103:370-7. [DOI: 10.1017/s0007114509991929] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present study aimed to investigate the role of Zn alone and in the presence of ascorbic acid (AA) and folic acid (FA) in albumin glycation. Glycation was performed by incubations of bovine serum albumin with glucose at 37°C along with Zn, AA or FA separately and Zn+AA or Zn+FA for 150 d. Glycation-mediated modifications were monitored as fluorescence of advanced glycation endproducts, carbonyl formation, β aggregation (thioflavin T and Congo red dyes), albumin-bound Zn, thiol groups and glycated aggregate's toxicity in HepG2 cells. Zn inhibited glycation and β aggregation, probably due to observed higher protein-bound Zn. It also protected protein thiols and increased cell survival. AA and FA enhanced glycation, which was lowered in Zn-co-incubated samples. FA increased albumin-bound Zn and showed maximum cell survival. Although these results warrant further in vivo investigation, the present data help in the understanding of the interplay of Zn with micronutrients in albumin glycation.
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