<p>Objective: Dyslipidemia precedes type 2 diabetes (T2D) and worsens with increasing glucose intolerance. First degree relatives of T2D patients have an increased risk to develop dyslipidemia and glucose intolerance. The aim of the present study was to assess the relation between the development of dyslipidemia and glucose intolerance in first-degree relatives of T2D patients. Research design and methods: Fasting lipoprotein profiles were determined by density gradient ultracentrifugation in T2D patients and their first-degree relatives (42 Caucasians and 33 South Asians), and in 29 normoglycemic controls from non-T2D families. Glucose tolerance, insulin sensitivity index (ISI) and insulin disposition index (DI) were assessed by an extended, frequently sampled oral glucose tolerance test (OGTT), and fractional insulin synthesis rate (FSR) was measured by <sup>13</sup>C-leucine enrichment in urinary C-peptide during the OGTT. Results: Of the first-degree relatives, 40, 16 and 19 had NGT, prediabetes and T2D, respectively. NGT family members had lower plasma HDL-cholesterol (HDL[sbnd]C) (1.34 ± 0.07 vs 1.58 ± 0.06 mmol/L; p = 0.015), HDL<sub>2</sub>-C (0.41 ± 0.05 vs 0.57 ± 0.05 mmol/L; p = 0.021) and HDL<sub>3</sub>-C (0.62 ± 0.03 vs 0.72 ± 0.02 mmol/L; p = 0.043) than controls. HDL<sub>2</sub>-C levels tended to decrease with increasing glucose intolerance state. In South Asians, buoyant LDL-C levels decreased with increasing glucose intolerance state (p = 0.006). In South Asian families, HDL-C correlated with both ISI and DI (β 0.42; p = 0.04 and β 0.53; p = 0.01, respectively), whereas HDL<sub>2</sub>-C and HDL<sub>3</sub>-C levels correlated with DI (β 0.64; p = 0.002 and β 0.57; p = 0.005, respectively). HDL<sub>2</sub>-C and plasma triglyceride correlated with FSR (β 0.48; p = 0.033 and β −0.50; p = 0.029, respectively). Conclusions: Low HDL<sub>2</sub>-C and HDL<sub>3</sub>-C levels are present in NGT first-degree relatives of T2D patients, and HDL<sub>2</sub>-C tend to decrease further with increasing glucose intolerance. In South Asian families HDL<sub>2</sub>-C and HDL<sub>3</sub>-C levels linked predominantly to deteriorating beta cell function.</p>

doi.org/10.1016/j.jdiacomp.2021.107993, hdl.handle.net/1765/136191
Journal of Diabetes and its Complications
Erasmus MC: University Medical Center Rotterdam

R. (Reyhana) Yahya, S. (Sjaam) Jainandunsing, M. (Mardin) Rashid, L.C. (Leonie) Van der Zee - van Vark, AC (Jeanette) Blommesteijn, F.W.M. de Rooij, … M.T. (Monique) Mulder. (2021). HDL associates with insulin resistance and beta-cell dysfunction in South Asian families at risk of type 2 diabetes. Journal of Diabetes and its Complications, 35(10). doi:10.1016/j.jdiacomp.2021.107993