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Synergism by individual macronutrients explains the marked early GLP-1 and islet hormone responses to mixed meal challenge in mice.

Ahlkvist, Linda LU ; Vikman, Jenny LU ; Pacini, G and Ahrén, Bo LU (2012) In Regulatory Peptides 178(1-3). p.29-35
Abstract
Apart from glucose, proteins and lipids also stimulate incretin and islet hormone secretion. However, the glucoregulatory effect of macronutrients in combination is poorly understood. We therefore developed an oral mixed meal model in mice to 1) explore the glucagon-like peptide-1 (GLP-1) and islet hormone responses to mixed meal versus isocaloric glucose, and 2) characterize the relative contribution of individual macronutrients to these responses. Anesthetized C57BL/6J female mice were orally gavaged with 1) a mixed meal (0.285kcal; glucose, whey protein and peanut oil; 60/20/20% kcal) versus an isocaloric glucose load (0.285kcal), and 2) a mixed meal (0.285kcal) versus glucose, whey protein or peanut oil administered individually in... (More)
Apart from glucose, proteins and lipids also stimulate incretin and islet hormone secretion. However, the glucoregulatory effect of macronutrients in combination is poorly understood. We therefore developed an oral mixed meal model in mice to 1) explore the glucagon-like peptide-1 (GLP-1) and islet hormone responses to mixed meal versus isocaloric glucose, and 2) characterize the relative contribution of individual macronutrients to these responses. Anesthetized C57BL/6J female mice were orally gavaged with 1) a mixed meal (0.285kcal; glucose, whey protein and peanut oil; 60/20/20% kcal) versus an isocaloric glucose load (0.285kcal), and 2) a mixed meal (0.285kcal) versus glucose, whey protein or peanut oil administered individually in their mixed meal caloric quantity, i.e., 0.171, 0.055 and 0.055kcal, respectively. Plasma was analyzed for glucose, insulin and intact GLP-1 before and during oral challenges. Plasma glucose was lower after mixed meal versus after isocaloric glucose ingestion. In spite of this, the peak insulin response (P=0.02), the peak intact GLP-1 levels (P=0.006) and the estimated β-cell function (P=0.005) were higher. Furthermore, the peak insulin (P=0.004) and intact GLP-1 (P=0.006) levels were higher after mixed meal ingestion than the sum of responses to individual macronutrients. Compared to glucose alone, we conclude that there is a marked early insulin response to mixed meal ingestion, which emanates from a synergistic, rather than an additive, effect of the individual macronutrients in the mixed meal and is in part likely caused by increased levels of GLP-1. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Regulatory Peptides
volume
178
issue
1-3
pages
29 - 35
publisher
Elsevier
external identifiers
  • wos:000309379800006
  • pmid:22750278
  • scopus:84865383561
ISSN
1873-1686
DOI
10.1016/j.regpep.2012.06.004
language
English
LU publication?
yes
id
eb25405f-b9a2-46c1-bd0e-cd553fb14f22 (old id 2967611)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/22750278?dopt=Abstract
date added to LUP
2012-08-09 14:18:06
date last changed
2017-01-15 03:11:36
@article{eb25405f-b9a2-46c1-bd0e-cd553fb14f22,
  abstract     = {Apart from glucose, proteins and lipids also stimulate incretin and islet hormone secretion. However, the glucoregulatory effect of macronutrients in combination is poorly understood. We therefore developed an oral mixed meal model in mice to 1) explore the glucagon-like peptide-1 (GLP-1) and islet hormone responses to mixed meal versus isocaloric glucose, and 2) characterize the relative contribution of individual macronutrients to these responses. Anesthetized C57BL/6J female mice were orally gavaged with 1) a mixed meal (0.285kcal; glucose, whey protein and peanut oil; 60/20/20% kcal) versus an isocaloric glucose load (0.285kcal), and 2) a mixed meal (0.285kcal) versus glucose, whey protein or peanut oil administered individually in their mixed meal caloric quantity, i.e., 0.171, 0.055 and 0.055kcal, respectively. Plasma was analyzed for glucose, insulin and intact GLP-1 before and during oral challenges. Plasma glucose was lower after mixed meal versus after isocaloric glucose ingestion. In spite of this, the peak insulin response (P=0.02), the peak intact GLP-1 levels (P=0.006) and the estimated β-cell function (P=0.005) were higher. Furthermore, the peak insulin (P=0.004) and intact GLP-1 (P=0.006) levels were higher after mixed meal ingestion than the sum of responses to individual macronutrients. Compared to glucose alone, we conclude that there is a marked early insulin response to mixed meal ingestion, which emanates from a synergistic, rather than an additive, effect of the individual macronutrients in the mixed meal and is in part likely caused by increased levels of GLP-1.},
  author       = {Ahlkvist, Linda and Vikman, Jenny and Pacini, G and Ahrén, Bo},
  issn         = {1873-1686},
  language     = {eng},
  number       = {1-3},
  pages        = {29--35},
  publisher    = {Elsevier},
  series       = {Regulatory Peptides},
  title        = {Synergism by individual macronutrients explains the marked early GLP-1 and islet hormone responses to mixed meal challenge in mice.},
  url          = {http://dx.doi.org/10.1016/j.regpep.2012.06.004},
  volume       = {178},
  year         = {2012},
}