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RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES, BANGALORE, KARNATAKA SYNOPSIS OF DISSERTATION "STUDY OF SERUM SIALIC ACID AND MICROALBUMINURIA IN DIABETIC NEPHROPATHY" Submitted by Dr. DIVIJA D.A. POST GRADUATE STUDENT IN BIOCHEMISTRY (M.D.) DEPARTMENT OF BIOCHEMISTRY ADICHUNCHANAGIRI INSTITUTE OF MEDICAL SCIENCES, B.G.NAGARA-571448 RAJIV GANDHI UNIVERSITY OF HEALTH SCIENCES, BANGALORE, KARNATAKA ANNEXURE – II PROFORMA FOR REGISTRATION OF SUBJECTS FOR DISSERTATION 1 NAME OF THE CANDIDATE AND ADDRESS 2 NAME OF THE INSTITUTION 3 COURSE OF STUDY AND SUBJECT 4 DATE OF ADDMISSION TO THE COURSE 5 TITLE OF THE TOPIC 6 BRIEF RESUME OF INTENDED WORK DR. DIVIJA D. A. P.G. IN (M.D) BIOCHEMISTRY DEPT. OF BIOCHEMISTRY A.I.M.S., B.G.NAGARA, MANDYA DISTRICT-571448 ADICHUNCHANAGIRI INSTITUTE OF MEDICAL SCIENCES, B.G.NAGARA. M.D. IN BIOCHEMISTRY 24TH MAY 2010 “STUDY OF SERUM SIALIC ACID AND MICROALBUMINURIA IN DIABETIC NEPHROPATHY” APPENDIX-I 6.1 NEED FOR THE STUDY APPENDIX-IA 6.2 REVIEW OF LITERATURE APPENDIX-IB 6.3 OBJECTIVES OF THE STUDY APPENDIX-IC 6.4 INCLUSION AND EXCLUSION . CRITERIA 7 MATERIALS AND METHODS APPENDIX-ID APPENDIX-II 7.1 SOURCE OF DATA APPENDIX-IIA 7.2 METHOD OF COLLECTION OF DATA (INCLUDING SAMPLING PROCEDURES ANY) APPENDIX-IIB 7.3 DOES STUDY REQUIRED ANY INVESTIGATIONS OR INVESTIGATIONS TO BE CONDUCTED ON PATIENTS OR OTHER ANIMALS, IF SO PLEASE DESCRIBE BRIEFLY 7.4 HAS ETHICAL CLEARANCE BEEN OBTAINED FROM YOUR INSTITUTION IN CASE OF 7.3 YES APPENDIX –IIC YES APPENDIX –IID 8 PROFORMA AND LIST OF REFERENCES APPENDIX – III 9 SIGNATURE OF THE CANDIDATE 10 REMARKS OF THE GUIDE THE ABOVE MENTIONED TOPIC IS ACCEPTED TO GUIDE 11 11.1 NAME OF THE GUIDE DR. RAJESHWARI.A., M.Sc , Ph.D ASSISTANT PROFESSOR DEPT. OF BIOCHEMISTRY A.I.M.S., B.G.NAGARA 11.2 SIGNATURE OF THE GUIDE 11.3 CO-GUIDE DR. ALIYA NUSRATH, M.D ASSOCIATE PROFESSOR AND INCHARGE HOD DEPT. OF BIOCHEMISTRY A.I.M.S., B.G.NAGARA 11.4 SIGNATURE OF CO-GUIDE 11.5 HEAD OF THE DEPARTMENT 11.6 SIGNATURE OF HEAD OF THE DEPARTMENT 12 12.1 REMARKS OF THE CHAIRMAN AND PRINCIPAL 12.2 SIGNATURE DR. ALIYA NUSRATH, M.D ASSOCIATE PROFESSOR AND INCHARGE HOD DEPT. OF BIOCHEMISTRY A.I.M.S., B.G. NAGARA STUDY OF SERUM SIALIC ACID AND MICROALBUMINURIA IN DIABETIC NEPHROPATHY APPENDIX-I 6. BRIEF RESUME OF THE INTENDED WORK. APPENDIX-IA NEED FOR THE STUDY Diabetes mellitus is the major healthcare problem worldwide. Diabetes mellitus, the most common endocrine disorder is characterized by metabolic abnormalities due to relative or absolute deficiency of insulin and or insulin resistance resulting in hyperglycemia and associated with micro and macrovascular complications. Serum sialic acid is a newly established potential risk factor for the development of macro and microvascular complications of diabetes. (1) Serum sialic acid is a component of glycoprotein such as acute phase proteins and several serum acute phase proteins are elevated in diabetes. Serum sialic acid level is increased in both type 1 and type 2 diabetes mellitus patients with albuminuria. The possible mechanism associated with the role of sialic acid is in maintaining the negative charge of renal glomerular basement membrane which is one of the main regulators of membrane permeability. Due to increased vascular permeability there is shedding of vascular endothelial sialic acid into circulation. (2) Diabetes mellitus is the leading cause of end stage renal disease (ESRD). It is responsible for 30-40 % of all ESRD. Although type 1 and type 2 DM lead to ESRD, the great majority of patients are those with type 2 DM. Microalbuminuria is the earliest manifestation of diabetic nephropathy and it is the predictor of incipient nephropathy in diabetic patients. Glycated hemoglobin is a standard measure of severity of diabetes mellitus and gives an idea about long term glycemic control. The current study was designed to investigate the role of serum sialic acid as a major risk factor in the development of diabetic nephropathy and to correlate the clinical relationship of serum sialic acid with glycated hemoglobin and marker of diabetic nephropathy such as microalbuminuria. APPENDIX-IB REVIEW OF LITERATURE Diabetes mellitus is not a single disease entity but rather a group of metabolic disorders sharing the common underlying feature of hyperglycemia. Chronic hyperglycemia and attendant metabolic dysregulation of diabetes mellitus may be associated with secondary damage in multiple organ systems, especially kidneys, eyes, nerves and blood vessels.(3) Diabetes mellitus tends to run in families. It is associated with dyslipidemia, atherosclerosis and predispose to certain specific microvascular abnormality including retinopathy, nephropathy and neuropathy. It increases the risk of stroke, myocardial infarction, peripheral vascular diseases. It also decreases the resistance to infection, especially if diabetes is poorly controlled. CLASSIFICATION OF DIABETES MELLITUS (4) 1) Type 1 Diabetes mellitus (Insulin dependent diabetes mellitus) Type 1 Diabetes mellitus is due to absolute deficiency of insulin caused by an autoimmune attack on the β cells of the pancreas and its progressive destruction. It is sub classified as a) Immune mediated b) Idiopathic 2) Type 2 Diabetes mellitus (Non insulin dependent diabetes mellitus) It is due to insulin resistance and dysfunctional β cells. It is further classified as a) Obese b) Non-obese c) Maturity onset diabetes of young 3) Diabetes Prone Status a) Gestational diabetes mellitus b) Impaired glucose tolerance (IGT) c) Impaired fasting hyperglycemia (IGF) 4) Secondary to other known causes a) Endocrinopathies : Cushing’s disease, Thyrotoxicosis, Acromegaly b) Drug induced: Pentamidine, Nicotinic acid, Glucocorticoids, BETA blockers c) Diseases of exocrine pancreas: Pancreatitis, Pancreatectomy, Neoplasia, Cystic fibrosis, Hemochromatosis d) Infections: Congenital Rubella, Coxsackies, Cytomegalo virus e) Uncommon forms of immune mediated diabetes - Stiff man syndrome - Anti insulin receptor antibodies f) Genetic syndrome associated with diabetes mellitus - Down’s syndrome - Klinefelter’s Syndrome - Turner’s Syndrome - Wolfram Syndrome METABOLIC DERANGEMENTS IN DIABETES MELLITUS CARBOHYDRATE METABOLISM Insulin is a hypoglycemic hormone which lowers blood glucose level by promoting utilization and storage of glucose. It stimulates glycolysis and inhibits gluconeogenesis and glycogenolysis. In diabetes mellitus the release of insulin and the cellular response to insulin are decreased which leads to inhibition of glycolysis and stimulation of gluconeogenesis and glycogenolysis resulting in hyperglycemia. (4) LIPID METABOLISM Normally insulin inhibits lipolysis which is evidenced by fall in circulating plasma free fatty acid levels. It enhances lipogenesis and the synthesis of triacyl glycerols by providing more acetyl coA and NADPH. The principle action of insulin in adipose tissue is to inhibit the activity of hormone sensitive lipase reducing the release not only of free fatty acid but also of glycerol. (5) In diabetes mellitus, due to insulin deficiency there is increased lipolysis with increased plasma free fatty acids. This causes increased uptake and oxidation of free fatty acid, releasing more of acetyl CoA. The acetyl CoA cannot be completely oxidized in TCA cycle, as the availability of oxaloacetate is limited. Hence excess of acetyl CoA is diverted to ketogenesis causing Ketonemia and Ketosis. (4) PROTEIN MATABOLISM Insulin is an anabolic hormone. It stimulates entry of amino acids into the cells, enhances protein synthesis and reduces protein degradation. In diabetes mellitus there will be absence of anabolic effects of insulin which leads to increased catabolism of proteins and amino acids providing substrates for gluconeogenesis. (4) DIABETIC NEPHROPATHY Diabetic nephropathy is characterized clinically as a triad of hypertension, proteinuria (>300 mg/24 hrs) and progressive decline in renal function. (8) The term diabetic nephropathy is applied to the conglomerate of lesions that often occur concurrently in the diabetic kidney. (3) Morphologic changes in the glomeruli include (3) a) Capillary basement membrane thickening b) Diffuse mesangial sclerosis c) Nodular glomerulosclerosis Diabetic nephropathy is separated into 4 classes, based on biopsy findings. They range from the least severe (class 1) to the most severe ( class 1V) (6) Class I : Glomerular basement membrane thickening. No mesangial expansion, nodular increase in the mesangial matrix or global glomerulosclerosis of more than half of the glomeruli. Class II: Mesangial expansion, mild (IIa) or severe (IIb) Class III : Nodular sclerosis (Kimmelstiel-Wilson lesions); The presence of atleast one strong Kimmelstiel-Wilson lesion but no more than 50% global glomerulosclerosis. Class IV : Advanced diabetic glomerulosclerosis. Biopsies with more than 50% global glomerulosclerosis. Diabetic nephropathy, leading cause of ESRD remains a major cause of morbidity and mortality for persons with either type 1 or type 2 DM. Nephropathy if suboptimally managed follows a predictable course, starting with microalbuminuria through proteinuria, azotemia and culminating in end stage renal disease. PATHOGENESIS OF DIABETIC NEPHROPATHY : Tissue injury caused by diabetic vascular complications stimulates local cytokine secretion from cells such as endothelium and macrophages which are the major sources of cytokine production, this stimulates an acute phase response. Sialic acid being a component of acute phase glycoprotein if increases before microangiopathy develops, it may be an early signal of process such as hypercytokinemia that cause or drastically increase the risk of renal failure. (1) The reason for increased incidence of microalbuminuria in diabetic nephropathy is probably the result of widespread endothelial dysfunction arising from the effects of cytokines and other inflammatory mediators, released during the intense inflammatory responses that are associated with critical illnesses. (7) The effects of disruption of the integrity of the endothelial barriers is manifested as altered glomerular endothelial permeability in the kidneys, allowing increased amounts of albumin to escape into the glomerular ultrafiltrate. The tubular reabsorptive mechanism for albumin from the ultrafiltrate is exceeded beyond its threshold capacity, leading to increased excretion of albumin in the urine. (7) Other causes for diabetic nephropathy include (8) Generation of mitochondrial ROS (Reactive Oxygen species) Accumulation of AGE’s (Advanced Glycation End Products) Activation of intracellular signalling molecules such as PKC (Protein Kinase C) SERUM SIALIC ACID Serum sialic acid (N-acetyl neuraminic acid) an inflammatory marker, is a protein bound carbohydrate and occurs in combination with other monosaccharides like galactose, mannose, glucosamine, galactosamine and fructose. Sialic acid is the group name for the acetylated neuraminic acids such as N -acetyl neuraminic acid, N-glycol neuraminic acid and Di-acetyl neuraminic acid. Only N- acetyl neuraminic acid has been isolated from human serum. Normal range of total sialic acid level in serum plasma is (9) Men : 1.57 – 2.63 mmol / l Women : 1.69 – 2.64 mmol / l There is only a minute amount of free SA in tissues and body fluids, and no direct biological role has been identified for this unbound SA. Bound sialic acid is of major importance in cell biology because of the external position of SA on glycoproteins and glycolipids and on the outer cell membranes. (10) The unique structural feature of sialic acid is the negative charge present in it, which enables it to take part in binding and transport of positively charged molecules, and in the attraction and repulsion of cells and molecules. SA also contributes to the regulation of the permeability of the basement membranes in glomeruli. Sialic acid is released from the terminal oligosaccharide chains of some glycoproteins and glycolipids in the acute phase of inflammation. GLYCATED HEMOGLOBLIN (4) It is one of the best index of long term control of blood glucose level. When there is hyperglycemia proteins in the body undergo glycation. Glycation is a non enzymatic process where the glucose after entering RBC forms a Schiff’s base with N terminal amino group of protein by an aldimine linkage which changes to a ketamine linkage by an irreversible Amadori rearrangement. It remains inside the erythrocytes throughout its life span. (4) Normal level of glycated hemoglobin (HbA1c) is about 4-7%. Elevated glycated hemoglobin indicates poor control of diabetes mellitus. The risk of retinopathy and renal complications are proportionately increased with elevated glycated hemoglobin value and also with increase in age and duration of diabetes mellitus. HbA1c level reveals mean glucose level over previous 8-10 weeks. (4) BLOOD SUGAR LEVEL : FASTING BLOOD GLUCOSE (11) FBS is directly proportional to the severity of diabetes mellitus and the most commonly used marker for DM. In general FBS levels greater than 126mg/ dl on more than one occasion are diagnostic of diabetes mellitus, provided that drugs such as glucocorticoids are not being administered. POSTPRANDIAL BLOOD GLUCOSE (11) Two consecutive post prandial tests are recommended for diagnosis. Blood is drawn at 2 hrs after ingestion of the meal or glucose load. Two post prandial tests with glucose levels of 200 mg/dl or higher at 2 hours are suggestive of diabetes. BLOOD UREA Urea is the major nitrogen containing metabolic product of protein catabolism in humans accounting for > 75% of the non protein nitrogen eventually excreted. An increase in plasma urea concentration characterizes uremic (Azotemic) state. Measurement of blood and plasma urea has been widely used as an indicator of kidney function. (11). Normal range of Blood urea is 20-40 mg/dl. (4) Blood urea concentration in patient with untreated ESRD typically reach 108-135 mg/dl. SERUM CREATININE : (11) Creatinine is the cyclic anhydride of creatine that is produced as the final product of decomposition of phosphocreatine. Plasma creatinine is measured as a test of kidney function. Normal range of serum creatinine; 0.9 – 1.3 mg/dl in men 0.6 – 1.1 mg/dl in women Plasma Creatinine concentration in patients with untreated end stage renal disease may exceed 11mg /dl (11) MICROALBUMINURIA (11), (12) Microalbuminuria is defined as the excretion of 30 to 300 mg of albumin per day in urine. It is not a different form or fraction of albumin but just a very small amount of albumin. Albumin molecule is relatively small and it is often the first protein to enter the urine after the kidney is damaged. Normoalbuminuria: < 30 mg/24 hrs or <20 µg/min Microalbuminuria : 30-300 mg/24 hrs or 20-200 µg/min Macroalbuminuria : >300 mg/24 hrs or >200 µg/min APPENDIX-IC 6.3. OBJECTIVES OF THE STUDY - To estimate the serum sialic acid levels in diabetic nephropathy patients. - To know the correlation between serum sialic acid and microalbuminuria in diabetic nephropathy patients. - To know the correlation between serum sialic acid and glycated hemoglobin in diabetic nephropathy patients. APPENDIX-ID 6.4 INCLUSION AND EXCLUSION CRETERIA INCLUSION CRITERIA 50 clinically diagnosed cases of diabetic nephropathy who will attend out patient department and also who are admitted in wards will be taken for case study and 50 numbers of age and sex matched healthy persons will be taken as control. EXCLUSION CRITERIA Patients with acute and chronic inflammatory conditions, other metabolic conditions like ketoacidosis, cerebrovascular accidents, patients with pregnancy, pre-existing chronic Kidney disease, previously undiagnosed chronic renal failure, chronic glomerulonephritis, Nephrotic syndrome and alcoholics will be excluded from the study. APPENDIX-II 7. MATERIALS AND METHODS APPENDIX-IIA 7.1 SOURCE OF DATA All clinically diagnosed cases of diabetic nephropathy irrespective of age and sex who attend out patient department and admitted cases of Adichunchanagiri hospital and research centre will be included in the study. Age and sex matched healthy individuals will be taken as control group. Study span is about 18 months. APPENDIX-IIB 7.2 METHOD OF COLLECTION OF DATA LABORATORY INVESTIGATION IN DIABETIC NEPHROPATHY Blood samples will be collected in fasting state and will be analyzed for fasting blood glucose, serum sialic acid, blood urea, serum creatinine and glycated hemoglobin. Again blood sample will be collected from the same patient at 2 hrs after meal for post prandial sugar level estimation. 10ml of blood will be drawn under aseptic precautions from clinically diagnosed cases of diabetic nephropathy and healthy controls and divided into 4 test tubes, marked as 1, 2, 3 and 4. 1. Test tube 1 Contains 2 ml of blood with anticoagulant, which is used for estimation of FBS ( Glucose oxidase method ) 2. Test tube 2 contains 4 ml of blood with no anticoagulant that is allowed to clot and serum is separated. Serum is used for measurement of a) Blood Urea – ( Glutamate dehydrogenase– Urease method ) b) Serum creatinine ( Jaffe’s method ) c) Serum Sialic acid ( Modified Thiobarbituric acid assay of Warren ) 3. Test tube 3 contains whole blood that is used for estimation of glycated hemoglobin (Ion exchange Resin method ) 4. Test tube 4 contains 2 ml of blood which will be collected with anticoagulant after 2 hrs of meals, which is used for estimation of PPBS. 5. URINE – Microalbumin Random midstream urine samples (10ml) were collected in a sterile container without preservative and assayed for microalbumin (Immunoturbidimetric assay). STATISTICAL ANALYSIS Statistical analysis will be done using student‘t’ test and relevant statistical test and statistical significance will be compared between cases and control group. APPENDIX-IIC 7.3 DOES THE STUDY REQUIRE ANY INVESTIGATIONS OR INTERVENTION TO BE CONDUCTED ON PATIENTS OR OTHER ANIMALS, IF SO PLEASE DESCRIBE BRIEFLY YES, the patient will require the following blood and urine investigations 1. Blood sugar level (FBS and PPBS) 2. Blood urea 3. Serum creatinine 4. Serum sialic acid 5. Glycated hemoglobin 6. Microalbuminuria APPENDIX-IID 7.4 HAS THE ETHICAL CLEARANCE BEEN OBTAINED FROM YOUR INSTITUTION IN CASE OF 7.3? YES, the investigations are carried out after the ethical clearance from the institution. All investigations are carried out after taking the written consent from the patients. -: LIST OF REFERENCES :1) Syed Muhammad Shahid, Tabassum Mahaboob. “Clinical correlation between frequent risk factors of diabetic nephropathy and serum sialic acid”. Int J. Diabetes Metab 14:138-142, 2006. 2) Mohammad J.S, Muhammad T.M, Mukhtar Ahmad, Muhammad Riaz, Muhammad Umair. “ Serum Sialic acid concentration and type 2 DM”. Professional Med J Dec 2006; 13(4): 508-510. 3) Raminder Kumar, Ann Abbas, Nelson Fausto, Jon C. Aster, Robbins and cotron “Pathologic basis of disease” 8th Ed. Saunders Elsevier Publishing Division; 2010. 934-935, 1131-1146. 4) Vasudevan D.M and Srekumari S “Text book of Biochemistry for Medical Students”. 5th Ed. Jaypee brother’s medical publishers (P) Ltd: 2007. 5) Robert K. Murray., Daryle K Granner, Peter A Mayer, Victor M Rodwell. Harpers Illustrated Biochemistry 26th Ed. Mc.Graw-Hill Publisher; 2003. 6) Nancy Fowler Larson Authors and Disclosures; “Classification systems for Diabetic Nephropathy may advance patient care”. The Journal of the American Society of Nephrology Feb 18, 2010. 7) S. Basu, S. Chaudhuri, M. Bhattacharyya, T.K Chatterjee, S. Todi and A Majumdar. “Microalbuminuria ; An inexpensive, non invasive bedside tool to predict outcome in critically ill patients.” Indian journal of clinical Biochemistry, Vol 25, Number 2. April 2010 146-152. 8) Henry M. Kronerberg., Shlomo melmed, Kenneth S. Polonsky, P. Reed Larsen, “Williams textbook of endocrinology” 11th edition Saunders Elsevier Publishing Division; 2008. 9) Lorentz K T, Weib, Krass. Sialic acid in Humans serum and CSF. J Clin Chem Biochem 1986: 24: 189-198. 10) Schauer R Achievements and challenges of Sialic acid research. Glycoconj. J. 2000: 17: 485-499 11) Carl A Burtis, Edward R. Ashwood., David E. Burns, “Teitz textbook of clinical chemistry and molecular diagnosis.” 4th edition published by Elseveir, a division of Reed Elsevier India Private Ltd; 2006. 12) Bilous R W. DM and the Kidney. In; warell DA, COX TM, Firth JD, Jr. Benz Edwards J, editors, Oxford textbook of Med 4th edn: Newyork; Oxford University Press 2003; 374-380. APPENDIX – IID PROFORMA APPLICATION FOR ETHICS COMMITTEE APPROVAL SECTION A A. Title of the study B. Principal investigator DR. DIVIJA D. A. P. G. IN (M.D) BIOCHEMISTRY C. Co-investigator DR. RAJESHWARI.A M.Sc, Ph.D ASSISTANT PROFESSOR DEPT. OF BIOCHEMISTRY A.I.M.S., B.G. NAGARA GUIDE D. “ STUDY OF SERUM SIALIC ACID AND MICROALBUMINURIA IN DIABETIC NEPHROPATHY”. Name of the collaborator NA Department / Institution E. Whether permission has been obtained from the head of the collaborating department and institution NA SECTION – B APPENDIX-II Summary of the project SECTION - C APPENDIX-IC Objectives of the study SECTION – D APPENDIX-IIB Methodology A. Where the proposed study will be undertaken B. Duration of the project AH & RC, B.G.NAGARA. 18 MONTHS C. D. Nature of the subject: Does the study involve adult patients? YES Does the study involve children? YES Does the study involve normal volunteers? YES Does the study involve psychiatric patients? NO Does the study involve pregnant women? NO If the study involves healthy volunteers 1. Will they be institute students? NO 2. Will they be institute employees? NO 3. Will they be paid? NA 4. If they are to be paid, how much per person NA E. Is the study multi central trial? NO F. If yes, who is the coordinator? (Name and designation) NA Has the trial been approved by the ethical committee of other centers? NA If the study involves the usage of drugs: Please indicate whether, 1. The drug is marketed in India for the indication in which it will be used in the study. NA 2. The drug is marketed in India but not for the indication in which it will be used in the study. NA 3. The drug is only used for experimental use in humans. NA 4. Clearance of the drug controller of India has been obtained for: - Use of the drug in the healthy volunteers NA - Use of drug in-patients for a new indication. NA Phase one and two clinical trials NA - G. H. Experimental use in-patients and healthy volunteers. How do you propose to obtain the drug to be used in the study? NA NA - Gift from a drug company NA - Hospital supplies NA - Patients will be asked to purchase NA - Other sources (Explain) NA Funding (if any) for the project. Please state. NONE -None -Amount -Source -To whom payable I. Does any agency have a vested interest in NO the outcome of the project? J. Will data relating to subjects/controls be NO stored in a computer? K. L. Will the data analysis be done by -The researcher? YES -The funding agency NO Will technical / nursing help be required for the staff of hospital, if yes, Will it interfere with their duties? NO Will you recruit other staff for the duration of the study? NO If yes give details of M. I Designation NA II Qualification NA III Number NA IV Duration of employment NA Will informed consent be taken? YES If yes, Will it be written informed consent? YES Will it be oral consent? NO Will it be taken from the subject themselves? YES Will it be from the legal guardian? YES If no, give reason: N. Describe design, Methodology and APPENDIX-II Techniques Ethical clearance has been accorded. Date: Place: Chairman PG Training-cum research committee A.I.M.S., B.G.Nagara