Magadi Gopalakrishna Sridhar

Publications (4)6.7 Total impact

• Article: Can protein carbonyl / glutathione ratio be used as a potential biomarker to assess oxidative stress in alcoholic hepatitis?

  Ramalingam Sripradha, Magadi Gopalakrishna Sridhar, Aparna Agrawal
  [show abstract] [hide abstract]
  ABSTRACT: Context: Oxidative stress plays a crucial role in the pathogenesis of alcoholic liver disease (ALD). Aim: The present study was undertaken to evaluate the significance of protein carbonyl / glutathione ratio as a biomarker to assess the oxidative stress in alcoholic hepatitis. Settings and Design: The study included 30 patients with alcoholic hepatitis and 30 age-sex- matched controls. Protein carbonyl (PCO) levels was estimated by modified levine's method, malondialdehyde (MDA) by thiobarbituric acid method, reduced glutathione (GSH) by dithiobis-2-nitrobenzoic acid method, total sialic acid (TSA) by modified aminoff's method, plasma transferases (GGT, AST, and ALT), total protein and albumin using commercial kits adapted to autoanalyzer respectively. Statistical Analysis Used: All data were expressed as mean ± SEM. Spearman's correlation analysis and receiver operating characteristic curve were performed using SPSS version 16 for Microsoft. A P value < 0.05 was considered as significant. Results: Alcoholic hepatitis patients showed significantly higher levels of PCO, MDA, GGT, AST, AST/ALT, TSA, and significantly lower GSH, total protein and albumin levels. PCO/GSH ratio in these patients showed a significant positive correlation with GGT (r = 0.594, P = 0.000), AST/ALT (r = 0.443 P = 0.000), MDA (r = 0.727, P = 0.000), TSA (r = 0.729, P = 0.000), and a significant negative correlation with total protein (r = -0.683, P = 0.000) and albumin (r = -0.544, P = 0.000). ROC curve showed a cut off value of 2.735, indicating 100% sensitivity and 90% specificity of PCO/GSH at this value. Conclusions: Alcohol intake regularly for long duration leads to oxidative stress. We suggest that PCO/GSH ratio can be used as a potential biomarker to assess oxidative stress in alcoholic hepatitis.
  Indian Journal of Medical Sciences 10/2010; 64(10):476-83.
• Article: Increased glycation of hemoglobin in chronic renal failure: [corrected] potential role of oxidative stress.

  Nambiar Selvaraj, Zachariah Bobby, Magadi Gopalakrishna Sridhar
  [show abstract] [hide abstract]
  ABSTRACT: Among the various mechanisms proposed, the process of non-enzymatic glycation of proteins is believed to play an important role in the pathogenesis of chronic complications associated with renal failure. The two traditional factors found to modulate the early glycation of proteins are the prevailing concentration of glucose and half life of the protein. Among the various proteins that are known to undergo nonenzymatic glycation in vivo, hemoglobin has been the most thoroughly investigated. Determination of glycated hemoglobin in diabetic patients is currently acknowledged as the most reliable indicator for assessment of retrospective glycemic control and the planning of clinical management. The clinical utility of glycated hemoglobin measurements, however, in renal failure is controversial, given the numerous earlier studies showing no correlation between glycated hemoglobin and other indicators of blood glucose control in uremic subjects. With few exceptions, previous studies have suggested that the concentration of glycated hemoglobin was increased in uremic patients. There is documented evidence that increased glycated hemoglobin levels are found in certain non-diabetic states. So it stands to reason that hyperglycemia, although clearly being the culprit in diabetes, does not provide the complete answer to the etiology of increased early glycated products in non-diabetic conditions including chronic renal failure. This article reviews available evidence supporting increased glycation of hemoglobin in patients with chronic renal failure. Potential mechanisms for this increase are examined with special emphasis on the potential role of oxidative stress.
  Archives of Medical Research 05/2008; 39(3):277-84. · 1.88 Impact Factor
• Article: Association between oxidative stress and coronary lipid risk factors in hypothyroid women is independent of body mass index.

  Nivedita Nanda, Zachariah Bobby, Abdoul Hamide, Bidhan Chandra Koner, Magadi Gopalakrishna Sridhar
  [show abstract] [hide abstract]
  ABSTRACT: Hypothyroidism enhances the progression of atherogenesis. Furthermore, dyslipidemia, hypertension, and obesity are known risk factors for atherosclerosis. Oxidative stress is implicated in the pathogenesis of cardiovascular diseases. However, there are contradicting reports on the existence of oxidative stress in hypothyroidism. Thus, the aim of the study is to evaluate the presence of oxidative stress in hypothyroidism and, if so, its possible association with various coronary lipid risk factors. The present study was carried out in a group of 27 freshly diagnosed normotensive primary hypothyroid female patients in comparison with healthy subjects. Their body mass index (BMI), serum thyroid profile, lipid profile, glucose, protein carbonylation, thiobarbituric acid reactive substances (TBARS), and blood antioxidant enzyme levels were estimated. The TBARS and protein carbonylation were significantly higher in cases compared with those in controls. Reduced glutathione was lower and glutathione peroxidase was higher in the test group compared with those in controls. Various lipid risk factors for coronary artery disease were significantly higher among the hypothyroid women in comparison with those in controls. The level of TBARS correlated significantly with various lipid risk factors among the hypothyroid women even after correcting the effect of BMI. However, no significant associations were observed between BMI and these risk factors when the effect of TBARS was nullified. In hypothyroidism, the coronary lipid risk factors seem to be more associated with lipid peroxidation than BMI. In conclusion, the present study indicates the presence of oxidative stress in hypothyroid patients and its association with atherogenic dyslipidemia, which is independent of BMI.
  Metabolism 11/2007; 56(10):1350-5. · 2.66 Impact Factor
• Article: Increased glycation of hemoglobin and plasma proteins in normotensive, non-diabetic obese Indian subjects: putative role of lipid peroxides.

  Viswanathan Sathiyapriya, Nambiar Selvaraj, Hanumanthappa Nandeesha, Zachariah Bobby, Aparna Agrawal, Magadi Gopalakrishna Sridhar, Purushothaman Pavithran, Nadaradjan Rattina Dasse
  [show abstract] [hide abstract]
  ABSTRACT: Glycation and lipid peroxidation are spontaneous reactions believed to contribute to the pathogenesis of many clinical disorders. The purpose of the present study was to evaluate the levels of lipid peroxides and glycated proteins in normotensive, non-diabetic obese Indian subjects and to assess possible associations between them. A total of 28 obese male subjects and 20 non-obese subjects were included in the present study. Whole blood glycated hemoglobin, plasma lipid peroxides and fructosamine levels were estimated in both groups. Lipid peroxides, glycated hemoglobin and fructosamine levels were significantly higher in obese subjects in comparison with non-obese subjects. We also found a significant association between malondialdehyde and body mass index (r=0.424, p=0.025). Partial correlation analysis revealed that malondialdehyde was significantly correlated with glycated hemoglobin (r=0.590, p=0.01) and fructosamine (r=0.442, p=0.021) after controlling for glucose. Increased glycation of proteins was found in normotensive, non-diabetic obese Indian subjects. These data also support the premise that lipid peroxides per se play a role in the glycation of hemoglobin and plasma proteins.
  Clinical Chemistry and Laboratory Medicine 02/2007; 45(8):996-9. · 2.15 Impact Factor