SUN-639 Secretagogin Levels Are Unrelated to Gestational Diabetes Mellitus in a Cohort of Pregnant Women

Introduction Secretagogin (SCGN) is a calcium binding protein related to insulin release in the pancreas. Although SCGN is not co-released with insulin, plasma concentrations have been found to be increased in type 2 diabetes mellitus patients.(1,2,3) Up to this day, no study on SCGN levels in patients with gestational diabetes mellitus (GDM) has been published. Patients and Methods In 138 women of a high-risk population for GDM at the Medical University of Vienna, secretagogin levels of GDM patients were compared to women with a normal glucose tolerance (NGT). Glucose tolerance, insulin resistance and secretion were assessed with an oral glucose tolerance test (oGTT) performed before 20 weeks gestation. The women with GDM (39.1%) were further divided into GDM types depending on insulin sensitivity or secretion defects defined as below the 25th percentile in the oGTT of the NGT controls. Results Compared to women with NGT (mean SCGN= 52.7 ng/dl), there was no statistically significant difference in SCGN in patients with GDM (mean value 53.9 ng/dl, p=0.857). After splitting into secretion defect and insulin resistance subtypes, SCGN remained unrelated to GDM in our study population. However, Secretagogin was found to be significantly higher in postpartum visits (mean= 62.9 ng/dl) than during pregnancy (mean value= 48.5 ng/dl; p= 0.047). Furthermore, SCGN was positively correlated with BMI (p=0.006) in the present analysis. Conclusion Unlike in studies conducted on type 2 diabetes,(1,2,3) a relationship between GDM and Secretagogin levels could not be demonstrated in this study. However, lower levels during pregnancy point towards physiological changes in SCGN levels unrelated to (gestational) diabetes mellitus. Further research, ideally including before-pregnancy levels, is paramount to assess possible roles of SCGN during pregnancy. 1. Maj M, Wagner L, Tretter V, et al. A TRPV1‐to‐secretagogin regulatory axis controls pancreatic β‐cell survival by modulating protein turnover. EMBO J. 2017;36(14):2107-2125. doi:10.15252/embj.201695347 2. Yang C, Qu H, Zhao X, et al. Plasma Secretagogin is Increased in Individuals with Glucose Dysregulation. Exp Clin Endocrinol Diabetes. 2019:0-4. doi:10.1055/a-1001-2244 3. Maj M, Wagner L, Tretter V. 20 Years of Secretagogin: Exocytosis and Beyond. Front Mol Neurosci. 2019;12(February):1-10. doi:10.3389/fnmol.2019.00029