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Kyu Jeung Ahn  (Ahn KJ) 5 Articles
Insulin Resistance During Pregnancy.
Kyu Jeung Ahn
Korean Diabetes J. 2009;33(2):77-82.   Published online April 1, 2009
DOI: https://doi.org/10.4093/kdj.2009.33.2.77
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AbstractAbstract PDF
Pregnancy is a complex metabolic state involving dramatic alterations in the hormonal or cytokine environments (increases in estrogen, progesterone, prolactin, cortisol, human chorionic gonadotropin, placental growth hormone and human placental lactogen, TNF-alpha, resistin, leptin, and a decrease in adiponectin) as well as an increasing burden of fuel utilization by the conceptus. Metabolically, the first trimester is characterized by increased insulin sensitivity and lipogenesis. The second and third trimesters, in contrast, are characterized by insulin resistance and increased lipolysis.
Stem Cell and Diabetes.
Kyu Jeung Ahn
Korean Diabetes J. 2001;25(3):179-183.   Published online June 1, 2001
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AbstractAbstract PDF
No abstract available.
Critical Factors Determined Islet Graft Function In Canine Islet Autotransplantation.
Tae Young Yang, In Kyung Jeong, Seung Hoon Oh, Sang Hoon Lee, Dong Jun Kim, Jong Ryul Hahm, Byung Joon Kim, Kyu Jeung Ahn, Sung Joo Kim, Jae Hoon Chung, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Kwang Won Kim
Korean Diabetes J. 2000;24(2):170-179.   Published online January 1, 2001
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AbstractAbstract PDF
BACKGROUND
Islet cell transplantation is an attractive alternative to whole organ pancreas transplantation, since it is clearly safer and simpler surgical procedure for the reciplents. However, several obstacles still remain, because the free islets appear to be more susceptible to non-specific inflammatory damage or immune mediated destruction than islets in an intact pancreas. Therefore, the purpose of this study is to examine the functional outcome of islet autograft and the factors related to the islets graft survival in mongrel dogs. METHODS: Twelve adult mongrel dogs weighting 12~16 kg were used for the experiment of total pancratectomy and islet autotransplantation. The islets were properly isolated by a modified Recordi method. The obtained islets were further purified by centrifugation on discontinuous gradients using cell separation system (Model 2991, Cobe, Lakewood Colo). After the heparization(50U/kg), the islets were injected slowly into the liver through the portal vain for 30 minutes. The post-transplantation intravenous glucose tolerence test (IVGTT) with glucose disappearance rate (K), liver function test (LFT), fasting plasma glucose (FPG) ware measured periodically. RESULTS: I) The median of Ks were 1.3%/min (range 0.3~2.1) and the lEq/kg (150 m equivalents/kg of recipient body weight) was 3520 (range 1350-6550). The Ks in recipients with high lEq/kg (> or =5,000) were significantly higher than those in recipients with low lEq/kg (<5,000)(r=0.78, p<0.05). 2) The islet cell viability were estimated to be 95% and the median of the required insulin dosage for the maintenance of normal FPG were 0.7 (range 0~1.6) U/kg/day, The insulin requirement correlated well with the level of lEq/kg (r=-0.90, p<0.01). 3) The median of the volume of the transplanted pancreatic islet cell were 2.1 mL (range 0.7~5.0) and the purity was 60k (range 10~95), The portal pressure gradients of during the transplant procedure were 4.0(range 0.5~12.0) cmH20. The portal pressure gradients in recipients with high purity were significantly lower than those in recipients with low purity (r=-0,80, p<0,05). CONCLUSIONS: In this study, we confirmed that autotransplantation of islet cell on the pancreatectomized dogs can render nearly normoglycemia, and transplanted islet mass was most critical factor to successful autotransplantation in canine model.
Mutations in Hepatocyte Nuclear Factor-la in Early-Onset Type 2 Diabetes Mellitus in Korea.
Kyoung Ah Kim, Myung Shik Lee, Kyu Jeung Ahn, Jae Hoon Chung, Yong Ki Min, Moon Kyu Lee, Ki Up Lee, Ghi Su Kim, Kyoung Ho Suk, Dae Yeun Hwang, Kwang Won Kim
Korean Diabetes J. 1999;23(6):793-802.   Published online January 1, 2001
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AbstractAbstract PDF
BACKGROUND
Type 2 diabetes mellitus is a heterogeneous disorder caused by the unfavorable combination of genetic and environmental factors. Maturity-onset diabetes of the young (MODY) is a rare form of familial type 2 diabetes mellitus characterized by an early onset, and it is appearance in at least three consecutive generations, consistent with an autosomal dominant mode of inheritance. It accounts for 1~3% of type 2 diabetes mellitus cases. As of today, five different MODY genes have been identified. In 1996, Yamagata et al. reported that MODY3 and MODY 1 were caused by mutations in hepatocyte nuclear factor (HNF) la and 4a, respectively. Furthermore, there have been reports that HNF-la gene mutation could be a cause of early-onset type 2 diabetes mellitus with familial history, although these patients do not fulfill the clinical criteria of MODY. Therefore, the purpose of this study was to examine the mutation of HNF-la gene in early-onset type 2 diabetes mellitus in Korean subjects. METHODS: Sixteen cases of early-onset type 2 diabetes mellitus with familial history were included in the study. Five of these subjects were MODY patients according to our revised criteria. DNA was isolated from peripheral blood. The 10 exons and flanking introns of the HNF-1 a gene were amplified by polymerase chain reaction (PCR). The PCR products were sequenced using an AmpliTaq FS Dye Terminator Cycle Sequencing Kit (Perkin-Elmer Applied Biosystems). RESULT: Mutation in the HNF-la gene was identified in 1 of the 16 patients. It was a hitherto unreported novel missense mutation, R263L. This mutation co-segregated with type 2 diabetes mellitus or impaired glucose tolerance in his family and was not found in family members with normal glucose tolerance. CONCLUSION: Findings from this study suggests that MODY3 caused by mutation of HNF-la gene is also present in early onset type 2 diabetic of Korean subjects. This is the first time that HNF-la mutation causing MODY was identified in Korea.
The Significance of thebeta3 Adrenergic Receptor Gene Polymorphism in Obese Koreans.
Byoung Joon Kim, Sung Hoon Kim, Dong Jun Kim, Jong Ryeal Hahm, Jin Seok Kim, Kyu Jeung Ahn, Jae Hoon Chung, Yong Ki Min, Myung Shik Lee, Moon Kyu Lee, Kwang Won Kim
Korean Diabetes J. 1998;22(4):450-456.   Published online January 1, 2001
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AbstractAbstract PDF
BACKGROUND
The b3 adrenergic receptor (b3-AR), expressed mainly in visceral fat of human, is involved in regulation of lipolysis and thermogenesis. The missense mutation of b3-AR gene, resulting in the replacement of tryptophan by arginine at position 64 (Trp64Arg), is associated with decreased resting metabolic rate, weight gain and development of obesity. The purpose of this study was to investigate the frequency of the b3-AR gene polymorphism in obese Koreans. Subjects and METHODS: b3-AR genotype was determined in 87 healthy Koreans who visited SMC for the purpose of health checking from Dec/1996 to Feb/1997. Oral glucose tolerance test was performed with 75 g glucose. Lipid profiles, insulin, C-peptide were measured. Anthropometric data was obtained from physical examination and medical records. The subjects with previously diagnosed diabetes mellitus, other endocrine diseases or chronic illness were excluded. To determine the polymorphism, genomic DNA was isolated and PCR and RFLP by MvaI were carried. RESULTS: 1. The difference in frequency of Trp64Arg mutation between two groups was highly significant. (12 subjects (63%) in obese group and 21 subjects (30%) in non obese group, p<0.02) 2. There was significantly high allele frequency in obese group. (obese group: 32 %; non obese group: 15 %, p<0.02). 3. According to BMI, there were significantly high WHR (0.88+0.04 vs 0.83+0.06,p=0.01), total body fat (29.8+7.4 vs 24.4+6.5%, p=0.01) and systolic blood pressure(132+19 vs 124+14mmHg, p=0.04) in obese group. 4. According to b3-AR genotype, there were significantly high WHR (0.830.056 vs. 0.860.05) and 120 min (260.5+171. 5 vs 355.9+234.6 pmol/L, p=0.04) insulin level during OGTT in heterozygote group. CONCLUSION: These results suggest that the frequency of the b3-AR gene mutation was significantly higher in obese Koreans and b3-AR gene polymorphism might play a role in the pathogenesis of obesity.

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