Aerobic Training Reduces Pancreatic Fat Content and Improves β‐cell Function: A Randomized Controlled Trial Using IDEAL‐IQ Magnetic Resonance Imaging

Author(s):  
Min Li ◽  
Qidong Zheng ◽  
Joshua D. Miller ◽  
Panpan Zuo ◽  
Xiaodan Yuan ◽  
...  
2018 ◽  
Vol 103 (9) ◽  
pp. 3260-3266 ◽  
Author(s):  
Daniel Popp ◽  
Stephanie Aertsen ◽  
Charlotte Luetke-Daldrup ◽  
Eva Coppenrath ◽  
Holger Hetterich ◽  
...  

Abstract Context Pancreatic steatosis may contribute to β-cell dysfunction in type 2 diabetes (T2D), but data are controversial. Women who had gestational diabetes mellitus (GDM) are at high risk for developing T2D. Objective To examine the association of pancreatic fat content with early/first-phase insulin secretion (as markers of β-cell function). Design Cross-sectional analysis of a subcohort of the monocentric, prospective cohort study titled Prediction, Prevention, and Subclassification of Type 2 Diabetes. Setting Ludwig Maximilians University Hospital, Munich, Germany. Participants Ninety-seven women, 3 to 16 months after pregnancy [41 normoglycemic women post-GDM, 19 women post-GDM with pathological glucose metabolism, and 37 normoglycemic women after a normoglycemic pregnancy (controls)]. Main Outcome Measures Correlation of MRI-measured pancreatic fat content with early insulin release in an oral glucose tolerance test (OGGT) [insulin increment within the first 30 minutes of the OGTT (IR30)] and first-phase insulin response (FPIR) in an intravenous glucose tolerance test (n = 65), both adjusted for insulin sensitivity index (ISI). Results Pancreatic fat content did not correlate with IR30 and FPIR adjusted for ISI. It correlated positively with body mass index, waist circumference, liver fat, and intraabdominal fat volume. Conclusion Pancreatic fat content does not correlate with β-cell function in a cohort of young women with different degrees of T2D risk.


2014 ◽  
Vol 109 (4) ◽  
pp. 589-597 ◽  
Author(s):  
Vincent Wai-Sun Wong ◽  
Grace Lai-Hung Wong ◽  
David Ka-Wai Yeung ◽  
Jill M Abrigo ◽  
Alice Pik-Shan Kong ◽  
...  

2009 ◽  
Vol 296 (3) ◽  
pp. E573-E578 ◽  
Author(s):  
Patrick F. Antkowiak ◽  
Sarah A. Tersey ◽  
Jeffrey D. Carter ◽  
Moriel H. Vandsburger ◽  
Jerry L. Nadler ◽  
...  

Loss of β-cell function in type 1 and type 2 diabetes leads to metabolic dysregulation and inability to maintain normoglycemia. Noninvasive imaging of β-cell function in vivo would therefore provide a valuable diagnostic and research tool for quantifying progression to diabetes and response to therapeutic intervention. Because manganese (Mn2+) is a longitudinal relaxation time (T1)-shortening magnetic resonance imaging (MRI) contrast agent that enters cells such as pancreatic β-cells through voltage-gated calcium channels, we hypothesized that Mn2+-enhanced MRI of the pancreas after glucose infusion would allow for noninvasive detection of β-cell function in vivo. To test this hypothesis, we administered glucose and saline challenges intravenously to normal mice and mice given high or low doses of streptozotocin (STZ) to induce diabetes. Serial inversion recovery MRI was subsequently performed after Mn2+ injection to probe Mn2+ accumulation in the pancreas. Time-intensity curves of the pancreas (normalized to the liver) fit to a sigmoid function showed a 51% increase in signal plateau height after glucose stimulation relative to saline ( P < 0.01) in normal mice. In diabetic mice given a high dose of STZ, only a 9% increase in plateau signal intensity was observed after glucose challenge ( P = not significant); in mice given a low dose of STZ, a 20% increase in plateau signal intensity was seen after glucose challenge ( P = 0.02). Consistent with these imaging findings, the pancreatic insulin content of high- and low-dose STZ diabetic mice was reduced about 20-fold and 10-fold, respectively, compared with normal mice. We conclude that Mn2+-enhanced MRI demonstrates excellent potential as a means for noninvasively monitoring β-cell function in vivo and may have the sensitivity to detect progressive decreases in function that occur in the diabetic disease process.


2019 ◽  
Vol 66 (3) ◽  
pp. 265-270 ◽  
Author(s):  
Ting Lu ◽  
Yao Wang ◽  
Ting Dou ◽  
Bizhen Xue ◽  
Yuanyuan Tan ◽  
...  

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