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Diabetes, Vol 43, Issue 4 535-539, Copyright © 1994 by American Diabetes Association
Tissue and plasma concentrations of amidated and glycine-extended glucagon-like peptide I in humans
C Orskov, L Rabenhoj, A Wettergren, H Kofod and JJ Holst
Department of Medical Anatomy, Panum Institute, Copenhagen, Denmark.
Using specific radioimmunoassays, we studied the occurrence of amidated and
glycine-extended glucagon-like peptide I (GLP-I) molecules in the human
small intestine and pancreas and in the circulation system in response to a
breakfast meal. Through gel permeation chromatography of extracts of the
human pancreas (n = 5), we found that 71% of the GLP-I immunoreactivity
eluted as a large molecule corresponding to the major proglucagon fragment,
24% corresponded to GLP-I 1-36 amide, and 5% to GLP-I 1-37. By gel
permeation chromatography of extracts of human small intestine (n = 6), we
found that all immunoreactivity eluted in one peak at the common elution
position of the two insulin-releasing peptides, GLP-I 7-36 amide and GLP-I
7-37. Of the GLP-I immunoreactivity, 80% corresponded to GLP-I 7-36 amide
and 20% to GLP-I 7-37. The mean concentrations of amidated GLP-I and
glycine-extended GLP-I in fasting plasma were 7 +/- 1 and 6 +/- 1 pM,
respectively (n = 6). In response to a breakfast meal, the concentration of
amidated GLP-I rose significantly amounting to 41 +/- 5 pM 90 min after the
meal ingestion, whereas the concentration of glycine-extended GLP-I only
rose slightly to a maximum of 10 +/- 1 pM. Thus, both amidated and
glycine-extended GLP-I molecules are produced in the small intestine and in
the pancreas in humans. Both amidated and glycine-extended GLP-I are
measurable in fasting plasma.(ABSTRACT TRUNCATED AT 250 WORDS)

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87(11):
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[Abstract]
[Full Text]
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[PDF]
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M.-B. Toft-Nielsen, M. B. Damholt, S. Madsbad, L. M. Hilsted, T. E. Hughes, B. K. Michelsen, and J. J. Holst
Determinants of the Impaired Secretion of Glucagon-Like Peptide-1 in Type 2 Diabetic Patients
J. Clin. Endocrinol. Metab.,
August 1, 2001;
86(8):
3717 - 3723.
[Abstract]
[Full Text]
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M.-B. Toft-Nielsen, S. Madsbad, and J. J. Holst
Determinants of the Effectiveness of Glucagon-Like Peptide-1 in Type 2 Diabetes
J. Clin. Endocrinol. Metab.,
August 1, 2001;
86(8):
3853 - 3860.
[Abstract]
[Full Text]
[PDF]
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