Insulin secretion-sensitivity index-2 could be a novel marker in the identification of the role of pancreatic iron deposition on beta-cell function in thalassemia major


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Karadas N. , Yurekli B. P. , Bayraktaroglu S. , Aydinok Y.

ENDOCRINE JOURNAL, cilt.66, ss.1093-1099, 2019 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 66 Konu: 12
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1507/endocrj.ej19-0191
  • Dergi Adı: ENDOCRINE JOURNAL
  • Sayfa Sayıları: ss.1093-1099

Özet

The purpose of this study is to evaluate the impact of insulin secretion-sensitivity index-2 (ISSI-2) in the identification of the role of pancreatic iron deposition on beta-cell function in thalassemia major. Tissue iron stores were measured with magnetic resonance imaging (MR1) in the liver (R2), pancreas (R2*), and heart (Tr). ISSI-2 was assessed as a novel oral glucose tolerance test-based measure of beta-cell function. Also, the Stumvoll index showing the insulin sensitivity and Stumvoll index estimating first and second phase insulin secretion were calculated. Fourteen of the 51 Thalassemia Major patients, aged 8-34 (mean 21.1 +/- 7.2) years-old, had either an impaired glucose tolerance test (n = 9, 17.6%) or diabetes mellitus (n= 5, 9.8%) referred to as the glucose dysregulation (GD) group. The median serum ferritin and the mean liver R2 and cardiac T2* values were not significantly different between the GD and normal glucose tolerance (NOT, n = 37) groups whereas pancreas R2* was significantly higher in the GD group compared to the NGT group (p= 0.004). Patients with GD showed significantly lower ISSI-2 index (p < 0.001) as well as the Stumvoll index and Stumvoll first and second phase indices compared to those with NGT (p < 0.001). All patients with GD displayed a pancreas R2* >50 Hz and ISSI-2 <2. In conclusion, Pancreas R2* MR1 combined with ISSI-2 index may be valuable parameters to identify patients at the highest risk for developing glucose dysregulation.