title: Glucose-stimulated insulin secretion: Effects of high-fat diet and acute stress.
abstract: BACKGROUND
  One of the major topics in modern societies is the study of relationships between diet, stress and incidence of metabolic disorders.
  
  
  OBJECTIVE
  This study aimed to investigate possible impairment in glucose-stimulated insulin secretion induced by a high-fat (cow intra-abdominal fat) diet in response to acute stress.
  
  
  METHODS
  Male Wistar rats were divided into high-fat and normal diet groups and each group was further divided into stress and control subgroups. Stress was induced by a communication box. Plasma levels of glucose, insulin and corticosterone were measured in both diet groups. Glucose tolerance, homeostasis model assessment of insulin resistance (HOMA-IR) index, glucose-stimulated insulin secretion from isolated islets, food and energy intake as well as body weight were also evaluated.
  
  
  RESULTS
  In the normal diet group, physical stress increased plasma glucose concentrations. In both diet groups, plasma corticosterone levels increased after stress. HOMA-IR index decreased in high-fat fed rats. Food intake decreased while energy intake increased in the high-fat diet rats. Body weight in both diet groups increased in a similar manner. The high-fat diet did not affect insulin secretion; however, stress decreased insulin secretion from isolated islets of both diet groups. Only in the high fat diet group did physical stress increase insulin secretion at 16.7 mM glucose.
  
  
  CONCLUSIONS
  The cow intra-abdominal fat, did not affect either plasma glucose and insulin concentrations or glucose-induced insulin secretion. Interestingly, it seems that the high-fat diet enabled the islets of the physically stressed rats to secrete more insulin in response to high glucose concentrations.
authors: Neuroscience Research Center, Shahid Beheshti University of Medical Sciences, 19615-1178 Tehran, Iran.
authors: J
authors: J
authors: Ghalami
authors: H
authors: H
authors: Zardooz
authors: F
authors: F
authors: Rostamkhani
authors: B
authors: B
authors: Farrokhi
authors: M
authors: M
authors: Hedayati
mesh_terms: D000818:Animals; D001835:Body Weight / Q000187:drug effects; D003345:Corticosterone / Q000097:blood; D059305:Diet, High-Fat; D004435:Eating; D005947:Glucose / Q000494:pharmacology*; D005951:Glucose Tolerance Test; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D013315:Stress, Psychological; D013549:Sweetening Agents / Q000494:pharmacology*
chemical_list: D007328:Insulin; D013549:Sweetening Agents; D005947:Glucose; D003345:Corticosterone
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