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Original Articles
Efficacy of Sitagliptin When Added to Ongoing Therapy in Korean Subjects with Type 2 Diabetes Mellitus
Hye Soo Chung, Moon-Kyu Lee
Diabetes Metab J. 2011;35(4):411-417.   Published online August 31, 2011
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AbstractAbstract PDFPubReader   

To evaluate the clinical efficacy of sitagliptin for reducing plasma glucose levels in Korean subjects with type 2 diabetes mellitus during a 14-week treatment period.


Our study design involved the addition of 100 mg sitagliptin once-daily to three ongoing combination therapy regimens and changing from glimepiride and metformin to sitagliptin and metformin.


The addition of sitagliptin 100 mg/day produced a statistically significant reduction in mean HbA1c level (mean HbA1c reduction of 0.99±0.85%, P<0.01). In the group taking a combination of sitagliptin and metformin (n=143, initial mean HbA1c level=7.48%), the reductions in HbA1c, 2-hour postprandial glucose, and fasting glucose levels were 0.72±0.76% (P<0.01), 47±65 mg/dL (P<0.01), and 15±44 mg/dL (P<0.01), respectively. In the group taking a combination of sitagliptin, glimepiride, and metformin (n=125, initial mean HbA1c level=8.42%), the reductions in HbA1c, 2-hour postprandial glucose, and fasting glucose levels were 1.09±0.86% (P<0.01), 62±64 mg/dL (P<0.01), and 31±45 mg/dL (P<0.01), respectively. In the group taking a combination of sitagliptin, glimepiride, metformin, and α-glucosidase inhibitor (n=63, initial mean HbA1c level=9.19%), the reductions in HbA1c, 2-hour postprandial glucose, and fasting glucose levels were 1.27±0.70% (P<0.01), 72±65 mg/dL (P<0.01), and 35±51 mg/dL (P<0.01), respectively. In the group that had previous hypoglycemic events and that changed from glimepiride to sitagliptin, HbA1c level did not change but fasting glucose increased significantly (14±29 mg/dL, P<0.01).


Sitagliptin combination therapy for 14 weeks significantly improved glycemic control and was well-tolerated in Korean subjects with type 2 diabetes mellitus.


Citations to this article as recorded by  
  • Impact of Treviamet® & Treviamet XR® on quality of life besides glycemic control in type 2 DM patients
    Asima Khan, Muhammad Adnan Kanpurwala, Riasat Ali Khan, Najum F. Mahmudi, Verumal Lohano, Shakeel Ahmed, Majid Khan, Fareed Uddin, Syed Mohammad Ali, Maliha Saghir, Syed Hussain Baqar Abidi, Jahanzeb Kamal
    BMC Endocrine Disorders.2023;[Epub]     CrossRef
  • Efficacy and safety of sitagliptin/metformin fixed‐dose combination compared with glimepiride in patients with type 2 diabetes: A multicenter randomized double‐blind study
    Sang Soo Kim, In Joo Kim, Kwang Jae Lee, Jeong Hyun Park, Young Il Kim, Young Sil Lee, Sung Chang Chung, Sang Jin Lee
    Journal of Diabetes.2017; 9(4): 412.     CrossRef
  • Optimal Candidates for the Switch from Glimepiride to Sitagliptin to Reduce Hypoglycemia in Patients with Type 2 Diabetes Mellitus
    Hyun Min Kim, Jung Soo Lim, Byung-Wan Lee, Eun-Seok Kang, Hyun Chul Lee, Bong-Soo Cha
    Endocrinology and Metabolism.2015; 30(1): 84.     CrossRef
  • Effectiveness and safety of glimepiride and iDPP4, associated with metformin in second line pharmacotherapy of type 2 diabetes mellitus: systematic review and meta‐analysis
    JM. Amate, T. Lopez‐Cuadrado, N. Almendro, C. Bouza, Z. Saz‐Parkinson, R. Rivas‐Ruiz, J. Gonzalez‐Canudas
    International Journal of Clinical Practice.2015; 69(3): 292.     CrossRef
  • Clinical Characteristics and Metabolic Predictors of Rapid Responders to Dipeptidyl Peptidase-4 Inhibitor as an Add-on Therapy to Sulfonylurea and Metformin
    Ye An Kim, Won Sang Yoo, Eun Shil Hong, Eu Jeong Ku, Kyeong Seon Park, Soo Lim, Young Min Cho, Kyong Soo Park, Hak Chul Jang, Sung Hee Choi
    Diabetes & Metabolism Journal.2015; 39(6): 489.     CrossRef
  • Sitagliptin for Elderly Patients Aged 75 Years or Older with Inadequately Controlled Type 2 Diabetes with Common Antidiabetes Treatments
    Katsunori Suzuki, Yurie Mistuma, Takaaki Sato, Mariko Hatta
    International Journal of Clinical Medicine.2015; 06(09): 672.     CrossRef
  • Short‐ and long‐term effect of sitagliptin after near normalization of glycemic control with insulin in poorly controlled Japanese type 2 diabetic patients
    Keiko Fujisawa, Tetsuyuki Yasuda, Hideaki Kaneto, Naoto Katakami, Mayumi Tsuji, Fumiyo Kubo, Shugo Sasaki, Kazuyuki Miyashita, Toyoko Naka, Ryuuichi Kasami, Akio Kuroda, Munehide Matsuhisa, Iichiro Shimomura
    Journal of Diabetes Investigation.2014; 5(5): 548.     CrossRef
  • Efficacy and safety of vildagliptin, Saxagliptin or Sitagliptin as add-on therapy in Chinese patients with type 2 diabetes inadequately controlled with dual combination of traditional oral hypoglycemic agents
    Chun-Jun Li, Xiao-Juan Liu, Lian Bai, Qian Yu, Qiu-Mei Zhang, Pei Yu, De-Min Yu
    Diabetology & Metabolic Syndrome.2014;[Epub]     CrossRef
  • Tolerability, effectiveness and predictive parameters for the therapeutic usefulness of exenatide in obese, Korean patients with type 2 diabetes
    Sun Ok Song, Kwang Joon Kim, Byung‐Wan Lee, Eun Seok Kang, Bong Soo Cha, Hyun Chul Lee
    Journal of Diabetes Investigation.2014; 5(5): 554.     CrossRef
  • Efficacy of vildagliptin on glucose fluctuation in Japanese type 2 diabetic patients with ongoing sulfonylurea based oral glycemic agent therapy
    Keiji Yoshioka, Haruhiko Isotani, Shin-ichiro Ohashi, Minoru Imamura
    Diabetes & Metabolic Syndrome: Clinical Research & Reviews.2013; 7(1): 32.     CrossRef
  • Glimepiride Strongly Enhances the Glucose-Lowering Effect in Triple Oral Antidiabetes Therapy with Sitagliptin and Metformin for Japanese Patients with Type 2 Diabetes Mellitus
    Keiko Arai, Hajime Maeda, Sin-ichiro Sirabe, Ritsuko Yamamoto, Mikio Yamauchi, Tetsuyuki Hirao, Setsuko Hirao, Koichi Hirao
    Diabetes Technology & Therapeutics.2013; 15(4): 335.     CrossRef
  • Efficacy of sitagliptin on blood glucose fluctuation in Japanese type 2 diabetic patients with basal-supported oral therapy
    Mitsuyoshi Takahara, Toshihiko Shiraiwa, Hideaki Kaneto, Naoto Katakami, Taka-aki Matsuoka, Iichiro Shimomura
    Endocrine Journal.2012; 59(12): 1131.     CrossRef
Association of Hemoglobin A1c with Cardiovascular Disease Risk Factors and Metabolic Syndrome in Nondiabetic Adults.
Jin Hwa Kim, So Ra Choi, Jae Rok Lee, Ji Hye Shin, Sang Jun Lee, Mi Ah Han, Jong Park, Hak Yeon Bae, Sang Yong Kim
Korean Diabetes J. 2008;32(5):435-444.   Published online October 1, 2008
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  • 6 Crossref
AbstractAbstract PDF
Glycosylated hemoglobin (HbA1c) is a useful index of mean blood glucose concentrations over the preceding 2 to 3 months. Elevated HbA1c levels (> 7%) are associated with a higher incidence of microvascular and macrovascular complications in patients with diabetes mellitus. However, the relationship between HbA1c and cardiovascualr disease risk in nondiabetic adults has been unclear. The aim of this study is to estimate the association of HbA1c with cardiovascular disease risk factors and metabolic syndrome in nondiabetic adults. METHODS: The subjects of this study included 533 adults (180 males and 353 females) aged 20~70 years (mean age: 46.9 +/- 10.12 years) without previously diagnosed diabetes who lived in Kangyang country. We examined baseline HbA1c levels and cardiovascular risk factors. Metabolic syndrome was defined based on International Diabetes Federation guidelines. RESULTS: The prevalence of metabolic syndrome significantly increased as HbA1c increased. HbA1c revealed a significant correlation with age (r = 0.258, P < 0.001), BMI (r = 0.152, P < 0.001), waist circumference (r = 0.252, P < 0.001), fasting plasma glucose (r = 0.319, P < 0.001), systolic (r = 0.100, P = 0.021), diastolic (r = 0.115, P = 0.008) blood pressure, total cholesterol (r = 0.232, P < 0.001), triglyceride (r = 0.156, P < 0.001), LDL cholesterol (r = 0.216, P < 0.001), and HDL cholesterol (r = -0.167, P < 0.001). Multiple regression analysis showed that HbA1c had a association with age, fasting plasma glucose, and dyslipidemia. The receiver operating characterstics (ROC) curve analysis determined HbA1c of 5.35% to yield optimal sensitivity and specificity corresponding to the presence of metabolic syndrome. CONCLUSION: The HbA1c level is correlated with cardiovascular risk factors and prevalence of metabolic syndrome in nondiabetic adults.


Citations to this article as recorded by  
  • Association of Glycated Proteins with Inflammatory Proteins and Periodontal Disease Parameters
    Jeneen Panezai, Mohammad Altamash, Per-Erik Engstrӧm, Anders Larsson
    Journal of Diabetes Research.2020; 2020: 1.     CrossRef
  • The Impact of Health Behaviors of Male Workers without Diabetes on HbA1c
    Ji-Yun Park, Keon-Yeop Kim, Su-Jin Lee
    Journal of Health Informatics and Statistics.2018; 43(4): 344.     CrossRef
  • Impact of initial glycosylated hemoglobin level on cardiovascular outcomes in prediabetic patients with ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention
    Donghun Shin, Jinhee Ahn, Kwang Soo Cha, Jin Sup Park, Jun-Hyok Oh, Hye-Won Lee, Ju-Yong Hong, Bo-Won Kim, Taek Jong Hong
    Coronary Artery Disease.2016; 27(1): 40.     CrossRef
  • HbA1c Levels Are Associated with Chronic Kidney Disease in a Non-Diabetic Adult Population: A Nationwide Survey (KNHANES 2011–2013)
    Seok Hui Kang, Da Jung Jung, Eun Woo Choi, Kyu Hyang Cho, Jong Won Park, Jun Young Do, Sheng-Nan Lu
    PLOS ONE.2015; 10(12): e0145827.     CrossRef
  • Usefulness of Glycated Hemoglobin as Diagnostic Criteria for Metabolic Syndrome
    Sang Hyun Park, Ji Sung Yoon, Kyu Chang Won, Hyoung Woo Lee
    Journal of Korean Medical Science.2012; 27(9): 1057.     CrossRef
  • Relationship between inflammation biomarkers, antioxidant vitamins, and bone mineral density in patients with metabolic syndrome
    Yesong Lee, Misung Kim, Kyungsuk Choi, Juyong Kim, Wookyung Bae, Sohye Kim, Cheongmin Sohn
    Nutrition Research and Practice.2011; 5(2): 150.     CrossRef
Clinical Trial
Perspectives of "Ubiquitous Health Care System" for Diabetes Management.
Jae Hyoung Cho, Hyuk Sang Kwon, Kun Ho Yoon
Korean Diabetes J. 2006;30(2):87-95.   Published online March 1, 2006
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  • 7 Crossref
AbstractAbstract PDF
Although clear evidences of the beneficial effects of tight glycemic control on diabetic patients had been already made, the past decade has not seen any noticeable improvement in terms of glycemic control. "Ubiquitous health care system", which is one of the developing fusion technologies of IT, BT and NT, could give us new solutions in future. We established the Internet based glucose monitoring system (IBGMS) and conducted prospective, randomized short-term and long-term clinical trials using the system which can guide the patients with diabetes by mobile technology anytime and anywhere. The mean HbA1c and HbA1c fluctuation index (SD of mean HbA1c) during the whole study period was significantly lowered by the intervention, suggesting more improved state in both HbA1c level and glucose stability. Appropriate physician's advises to the patients' questions and problems at the right time through the IBGMS were the major interventions. Although many unsolved problems still exist, the Internet-based bidirectional communication system developed by the advanced information technology can contribute to the foundations to tomorrow's or ubiquitous medicine


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    Multimedia Tools and Applications.2017; 76(17): 17751.     CrossRef
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    Journal of Sensor Science and Technology.2011; 20(6): 434.     CrossRef
  • Diabetes Management System Based on Ubiquitous Healthcare
    Jiwoon Kim, Chul Woo Ahn
    Journal of Korean Diabetes.2011; 12(3): 133.     CrossRef
  • Service Design Attributes Affecting Diabetic Patient Preferences of Telemedicine in South Korea
    Hayoung Park, YuCheong Chon, Jongsu Lee, Ie-Jung Choi, Kun-Ho Yoon
    Telemedicine and e-Health.2011; 17(6): 442.     CrossRef
  • U-Health Service for Managing Chronic Disease: A Case Study on Managing Metabolic Syndrome in a Health Center in South Korea
    Tae-Min Song, Seewon Ryu, Sang Ho Lee
    Healthcare Informatics Research.2011; 17(4): 260.     CrossRef
  • Effects of 'Ubiquitous Healthcare' on the Ability of Self-Management in Elderly Diabetic Patients
    Sung Hoon Yu, Sun Hee Kim, So Yeon Kim, Sung Hee Choi, Soo Lim, Yoon Seok Chang, Hak Jong Lee, Young Joo Park, Hak Chul Jang
    Korean Diabetes Journal.2009; 33(1): 58.     CrossRef
Original Articles
The Long-term Effect of a Structured Diabetes Education Program for Uncontrolled Type 2 Diabetes Mellitus Patients-a 4-Year Follow-up.
Min Sun Song, Ki Ho Song, Seung Hyun Ko, Yu Bai Ahn, Joon Sung Kim, Jin Hee Shin, Yang Kyung Cho, Kun Ho Yoon, Bong Youn Cha, Ho Young Son, Dong Han Lee
Korean Diabetes J. 2005;29(2):140-150.   Published online March 1, 2005
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AbstractAbstract PDF
Diabetes mellitus is a chronic illness with many metabolic complications. The prevalence of diabetes mellitus has markedly increased. Until now, however, little data have been presented for the long-term evaluation of a structured diabetes education program (SDEP) for patients with type 2 diabetes mellitus. The aim of this study was to examine the effects of the SDEP on glycemic control, lipid profiles, and self-care behavior over a four-year follow-up period. METHODS: A total of 248 diabetic patients completed the SDEP from December 1999 to September 2000. Ninety-eight patients were followed-up for more than four years and 75 of them were selected for the study, after those subjects having a baseline glycated hemoglobin(HbA1c) levels below 7.9% were excluded. The laboratory data included the glycemic control status(fasting blood sugar and HbA1c), serum creatinine, and lipid profiles. Compliance with their diet, self monitoring of blood glucose, and their exercise frequency were monitored with a questionnaire that was completed by the patients when they visited the hospital. The data were analyzed by using repeated ANOVA measures and chi2 testing for detecting trends. RESULTS: There were no significant decreases in the fasting blood glucose, creatinine, total cholesterol, triglycerides or low density lipoprotein cholesterol for the SDEP group compared with the control group. The self-care behavior of the SDEP group was much better than that of the control group and it was well maintained. Although the self-care behavior tended to deteriorate with time in the SDEP group, the exercise frequency did not change. The HbA1c level was much improved in the SDEP group(HbA1c: SDEP, 7.9+/-1.2% vs. 8.9+/-1.6% for the control; P =0.009). High density lipoprotein(HDL) cholesterol was also relatively improved in the SDEP group(HDL cholesterol: SDEP, 1.1+/-0.2 mmol/L vs. 1.0+/-0.3mmol/L for the control; P=0.006). CONCLUSIONS: The glycemic control status of diabetic patients who undertook the SDEP was satisfactory for one year after the program, although all the habitual compliance measures decreased gradually with time over the total four years. These results demonstrate that the SDEP for patients with diabetes is useful in improving their long-term glycemic control and self-care behavior. Regular and sustained reinforcement with encouragement will be required for the diabetic patients to maintain their self-care
Evaluation of Glycemic Control in Type 2 Diabetic Patients have been Treated in General Hospital.
Joung Ho Park, Kwan Woo Kim, Eun Jin Kang, Tak Young Kim, Sa Ra Lee, Su Chan Bae, Mi Kyung Kim, Sin Yeong Choi, Jeong Hyun Park
Korean Diabetes J. 2004;28(3):208-218.   Published online June 1, 2004
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AbstractAbstract PDF
Good metabolic control is one of the most important parts of managing diabetes. Several studies in western countries have shown glycemic control in type 2 diabetic patients to be poorer than expected. Similar reports in Korea are very limited. Therefore, this study was performed to estimate the degree in glycemic control of type 2 diabetic patients that have been treated in general hospitals in Korea. METHODS: This was a cross-sectional retrospective study conducted on 1012 type 2 diabetic patients treated at the Maryknoll Hospital. Subjects with type 1 diabetes or a treatment duration of less than 6 month were excluded. The glycemic control was estimated by HbA1c and the clinical characteristics, including duration of diabetes, age, height and body weight, checked. The treatment methods were divided into four groups, namely diet, oral hypoglycemic agent, insulin alone, and insulin and oral hypoglycemic agent combination. Data were analyzedsed by SPSS version 11.0. RESULTS: The mean age, BMI, duration of diabetes and HbA1c of the subjects were 61.6+/-9.8 years, 24.6+/-3.2kg/m(2), 12.1+/-6.5 year and 7.6+/-1.3%, respectively, and the percentage of those achieving the goal of glycemic control(HbA1c<7%) was 35.7%. Those who achieved glycemic control were older than those who could not and also had a shorter duration of diabetes(p<0.001). There were no significant differences in the BMI, gender and HbA1c levels before treatment between the four groups. The subjects on diet treatment had a lower mean HbA1c level than those on insulin alone or combined therapy(p<0.05) CONCLUSION: The percentage of type 2 diabetic patients in good glycemic control in our general hospital was less than 40%, which was similar to previous western data. It is our suggestion that a large nationwide study is required to more accurately evaluate the state of glycemic control and find the reasons why certain patients could not reach this goal.
Randomized Controlled Trial
The Effects of Teaching Methods on the Dietary Compliance and Hemoglobin A1c Level in Patients with Diabetes Mellitus.
Sung Oh Chung, O Keum Song, Jae Min Ko, Jun Hwan Wi, Tae Hoon Lee, Ju Hyup Yum, Dae Kyoung Cho, Jin Hee Son, Hong Woo Nam, Hyung Joon Yoo, Young Nam Lee, Sung Gon Kim, Hyun Kyung Moon, Eul Sang Kim
Korean Diabetes J. 2000;24(5):560-573.   Published online January 1, 2001
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Diet control plays an important role in diabetic management, but it is often hard for diabetic patients to follow the dietary control program. Poor dietary compliance leads to metabolic derangements in patients with diabetes and it may derive mainly from defects in dietary education program rather than from patients themselves. Therefore, we performed a randomized prospective study to compare the effects of three different teaching methods for diet control. METHODS: Forty eight diabetic patients with poor glycemic control (mean HbA1c 11.4+/-1.5%) were enrolled during hospitalization and allocated at random to three different teaching methods i.e. Conventional diet sheet instruction (Group 1), Food recording on every meal (Group 2), and Meal time demonstration (Group 3). For evaluation, knowledge about DM diet and barriers to diet control were assessed by a questionnaire. Consistency in carbohydrate intake (Coefficient of variation) and serial HbA1C measurements were used for the estimation of dietary compliance and glycemic control respectively. RESULTS: During five months' follow-up period, there was no remarkable improvement in knowledge about diabetic diet control, dietary compliance and glycemic control in Group 1 patients. But both dietary compliance and glycemic control improved in Group 2 and 3 patients during follow-up period. In Group 2 CV (Coefficient of Variation ) fell from 36.4+/-15.2% to 27.7+/-17.3% and in Group 3 from 32.1+/-9.6% to 23.2+/-10.5% (p<0.05). In Group 2 HbA1c fell from 12+/-2.2% to 8.3 +/-2.0% and in Group 3 from 11.5+/-2.0% to 7.5+/-1.9% (p<0.01). The change of HbA1c level showed an appreciable correlation with dietary compliance (r= 0.75). Among the perceived barriers to dietary practice in patients of Group 2 and Group 3, extrinsic factors related to knowledge lowered during the intervention (p<0.05). Even though Group 3 patients had good dietary compliance, they still felt that intrinsic factors related to motive and attitude were the major barriers at the end of the study (p<0.05). CONCLUSION: We found that meal time demonstration teaching method may improve dietary compliance and glycemic control compared with the conven tional diet sheet instruction method.
Original Articles
HbA1c Concentration of Elderly Diabetic Patients with the Hypoglycemic Shock who were Admitted via Emergency Room.
Jin Cheol Park, Hyung Joon Yoo, Hae Seang Yim, Yong Tae Kim, Do Kyun Jin, Hyun Kyu Kim, Doo Man Kim, Jae Myung Yoo, Sung Hee Ihm, Moon Gi Choi, Sung Woo Park
Korean Diabetes J. 1998;22(4):546-551.   Published online January 1, 2001
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AbstractAbstract PDF
Mild degree of hypoglycemia is not unusual during drug therapy in elderly diabetic patients. However it is very difficult that the precise incidence of hypoglycemia is measured in elderly patients because the decreased cognitive function and autonomic dysfunction contribute to atypical hypoglycemic symptoms and signs. Therefore, most cases of elderly diabetic patients with hypoglycemia are discovered in comatose mental state. We did this study to evaluate the clinical charaeteristics of elderly diabetic patients with the hypoglycemic shock who were admitted via emergency room. METHODS: We analyzed the precipitating factors, mental status, and blood chemistries of the adult group(n=22, age 51+3.6 year, BMI-19 kg/m2) and elderly group(n=37, age=72+4.3 year, BMI=23 kg/m) that were classified by the point of 65 years old who were admitted via emergency room in state of the hypoglycemic shock. RESULTS: 1) In the precipitating factor of hypoglycemia, irregular oral intake was found in 64%(14/22) of the adult group and 64%(23/37) of the elderly group, and drug overdose was found in 27 %(1.6/22) of the adult group and 24%(9/37) of the elderly group. But there, was no significant difference between the adult and elderly group. 2) Those who arrived at the emerency room in comatose mental status were found in 45.5 % of adult group and 54.1 % of elderly group, that was no difference stastically. 3) HbA 1c was 5.8 +- 0.27% in elderly group and 8.0 +- 0.63% in the adult group who arrived at the emergency room, which was stastically significant difference between two groups. CONCLUSION: We concluded that lower HbA 1c in the elderly group than adult group who arrived at the emergency room suggest there was probability of unrecognized mild hypoglycemia before the onset of hypoglycemic shock.
Increased Serum 8-hydroxy-Guanine Levels in Diabetic Patients.
Byung Sool Moon, Yun Yong Lee, Chan Soo Shin, Kyong Soo Park, Seong Yeon Kim, Hong Kyu Lee, Su Jin Park, Myung Hee Chung
Korean Diabetes J. 1997;21(3):300-307.   Published online January 1, 2001
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AbstractAbstract PDF
Production of reactive oxygen species(ROS) increased in diabetic patients and oxidative damage may contribute to the development of diabetic complications. 8-OH-deoxyGuanosine (oh8dG) and 8-OH-Guanine(ohSGua) are known as excellent markers of the oxidative darnage to DNA. This study was performed to investigate whether serum 8-OH-guanine increased in diabetic patients and whether the glycemic control(HbAlc) is related to the levels of serum 8-OH-guanine. METHOD: In this study, 28 patients with diabetes mellitus was studied, We also included 27 nondiabetic healthy controls whose age, sex, and BMI were matehed to the diabetic patients. Serum 8-OH-Guanine was assayed by high performance liquid chromatography after antibody-based purification with monoclonal antibodies to S-OH-Guanine. RESULTS: The levels of serum 8-OH-Guanine was significantly higher in diabetic patients than in normal controls(4.02+/-3.77 pmol/mL vs. 0.89+/-0.63 pmol/ mL, p<0.01). Serum 8-OH-Guanine concentration was not related to age, HbAlc, duration of diabetes, creatinine clearance, total cholesterol, triglyceride, and HDL-cholesterol. Conclusions: We found a significant increase in serum 8-OH-guanine levels from diabetic patients compared with their respective controls. These results suggest that diabetic patients have significantly increased oxidatively damaged DNA. The factors regulating the oxidative damage to DNA should be further investigated.

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