Korean Diabetes Journal 2000;24(4):485-514.
Published online January 1, 2001.
The Role of beta-cell Dysfunction and Insulin Resistance in the Development of Post-renal Transplantation Diabetes Mellitus.
Jae Hyun Nam, Hyun Chul Lee, Churl Woo Ahn, Jang Il Mun, Soon Il Kim, Kiil Park, Young Duk Song, Sung Kil Lim, Kyung Rae Kim, Kap Bum Huh
Department of Internal Medicine and Surgery, Yonsei University, College of Medicine, Seoul, Korea.
Our study was undertaken to investigate the pathogenesis and possible risk factors for post-renal transplantation diabetes mellitus (PTDM). METHODS: we recruited 114 patients with normal glucose tolerance, and performed the 75 g oral glucose tolerance tests (OGTT) and the short insulin tolerance tests 1 week before and 9~12 months after transplantation, respectively. RESULTS: The subjects were classified into three groups on the basis of OGTT after transplantation by WHO criteria: 1) 36 (31.6%) subjects with normal glucose tolerance; 2) 51 (45.7%) subjects with impaired glucose tolerance; and 3) 27 (23.7%) subjects with post-renal transplantation diabetes mellitus. Dosages of steroid and cyclosporin-A (CsA) were equivalent among the 3 groups. Before transplantation, the fasting and 2-h plasma glucose, and proinsulin/insulin (PI/I) ratios were significantly higher in the IGT and PTDM groups than in the NGT group, but insulin sensitivity index (ISI) was not different among 3 groups. In addition, the area under the curve (AUC)-insulin on OGTT was significantly lower in the PTDM group than in the NGT group. After transplantation, however, ISI was increased in all groups. Furthermore, the ISI and PI/I ratios revealed significantly higher values in the PTDM group than in the NGT group after transplantation. CONCLUSION: These results revealed that fasting and 2-h plasma glucose levels, as well as proinsulin/insulin ratio before transplantation, which may all be indicators of beta-cell dysfunction, could be the predictors for the development of PTDM and beta-cell dysfunction rather than insulin resistance was proved to be the main factor for the pathogenesis of PTDM.
Key Words: Post-renal transplantation diabetes mellitus, beta-cell dysfunction, Insulin resistance, Proinsulin

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