ABSTRACT
Objective To evaluate the clinical value of non-invasive skin autofluorescence measurement of advanced glycation end products (AGE) to screen for both diabetes mellitus and impaired glucose tolerance (IGT). Methods A total of 389 individuals who underwent physical examination at Renmin Hospital of Wuhan University from December 2016 to August 2017, and were willing to participate were enrolled in our study. 293 people meeting the criteria were included finally. AGE value in the skin tissue was measured non-invasively via autofluorescence with the DM Scanner. Two-hour oral glucose tolerance testing, and measurements of fasting blood glucose and glycosylated hemoglobin were also performed for each patient. Results Among 293 subjects, 209 had normal glucose metabolism, 50 had IGT, and 34 had diabetes mellitus. The measured Advanced glycation end product values in these groups were (69.44 ± 7.28) AU, (79.67 ± 5.65) AU, and (81.17 ± 9.28) AU, respectively. The differences between groups were statistically significant (P<0.05). Pearson correlation analysis showed a significant positive correlation between autofluorescence measurements and fasting blood glucose, glycosylated hemoglobin and glucose level 2 hours after oral glucose loading (r=0.472, 0.433, and 0.546, respectively;P<0.001). The sensitivity of DM Scan screening for IGT was 84.00％, with a specificity of 84.87％. For diabetes mellitus, the sensitivity was 79.41％, and the specificity 84.87％. Conclusion DM Scan has high sensitivity in screening for diabetes mellitus and IGT. It has important clinical value in the early diagnosis of IGT.
ABSTRACT
Objective@#To evaluate the effect of acrylamide on the apoptosis of nerve cells by integral cell modelling in vitro which simulates the barrier effect and metabolic micro-environment.@*Methods@#A non-contact and co-cultured in vitro blood brain barrier (BBB) model was established by using human umbilical vein endothelial cells (HUVEC) and rat glioma cells (C6) . The trans-endotheilal electrical resistance (TEER) and horseradish peroxidase (HRP) tracer effects were measured to verify the tight connectivity and permeability of the established BBB model. An integrate discrete multiple organ cell co-culture (idMOC) model was established by inoculating the human renal cortical proximal tubular epithelial cells (HK-2) , human normal hepatocytes (L-02) and human neuroblastoma cells (SH-SY5Y) into the self-made multi-organ plate for co-culturing. Then the model was verified by observing the growth curve of various tissue cells under co-culturing or culturing individually. SH-SY5Y cells were exposed to different concentrations of acrylamide directly and indirectly (through BBB model and idMOC model) . The changes of cell apoptosis rate were analyzed by flow cytometry to explore the impact of model on Acrylamide (ACR) injury of typical neurotoxic agents.@*Results@#HUVEC cells can form a wide range of close-connected complex and then inhibit the external electric field under the cross-endothelial movement, and the mean was lower than that of endothelial cell culture group at 4, 5 and 6 days (P<0.05) ; After 20 min, the penetration rate of HRP in the co-culture group was less than that in the individual culture group, and the difference was statistically significant (P<0.05) , indicating that the barrier function of the co-culture group was higher than that of the individual culture group. All cells can exchange substances through the exchange hole of the culture plate, the cells grow well and there was no obvious death. The growth curve in individual culture group and co-culture group were basically the same, the difference was not statistically significant (P>0.05) . Under the condition of different concentrations of ACR (140, 270 g/ml) , compared with the direct exposure group, the apoptosis rate of the BBB model and the idMOC model were significantly decreased, and the difference was statistically significant (P<0.05) .@*Conclusion@#Based on HUVEC cells and C6 cells co-culture system, a blood-brain barrier model in vitro was established and based on co-culture of HK-2, L-02 and SH-SY5Y, the idMOC model was established. The toxicity and toxic action characteristics of ACR on SH-SY5Y cells were evaluated by validation tests.