Down-regulated expression of exocytotic proteins in pancreatic islets of diabetic GK rats

Wei Zhang; Akhtar Khan; Claes Goran Östenson; Per Olof Berggren; Suad Efendic; Björn Meister

doi:10.1006/bbrc.2002.6555

Down-regulated expression of exocytotic proteins in pancreatic islets of diabetic GK rats

Wei Zhang, Akhtar Khan, Claes Goran Östenson, Per Olof Berggren, Suad Efendic, Björn Meister

Surgery

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Abstract

Exocytosis is regulated by exocytotic proteins, which are present in insulin-secreting β-cells and play regulatory roles in insulin secretion. Non-insulin dependent diabetes mellitus (type 2 diabetes) is a disease characterized by impaired insulin secretion and insulin resistance. Exocytotic protein immunoreactivities were studied in pancreatic islets of type 2 diabetic Goto-Kakizaki (GK) rats using immunofluorescence histochemistry. The immunoreactivities for vesicle-associated membrane protein-2 (VAMP-2), synaptotag-min III, cysteine string protein (CSP), mammalian homologue of the unc-18 gene (Munc-18), α-soluble N-ethylmaleimide-sensitive attachment protein (α-SNAP), N-ethylmaleimide-sensitive factor (NSF) and synaptosomal-associated protein of 25 kDa (SNAP-25) exhibited weaker immunofluorescence intensity in islets of GK rats as compared to control Wistar rats. Insulin immunoreactivity was also decreased in GK rat β-cells, whereas no detectable alterations in the expression of actin immunoreactivity could be detected. The data suggest that reduced expression of exocytotic proteins and decreased insulin content may contribute to the diabetic syndrome in the GK rat.

Original language	English (US)
Pages (from-to)	1038-1044
Number of pages	7
Journal	Biochemical and biophysical research communications
Volume	291
Issue number	4
DOIs	https://doi.org/10.1006/bbrc.2002.6555
State	Published - Mar 8 2002

Keywords

α-SNAP
Actin
CSP
Insulin
Munc-18
NSF
SNAP-25
Synaptotagmin III
Syntaxin
VAMP-2

ASJC Scopus subject areas

Biochemistry
Biophysics
Molecular Biology

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title = "Down-regulated expression of exocytotic proteins in pancreatic islets of diabetic GK rats",

abstract = "Exocytosis is regulated by exocytotic proteins, which are present in insulin-secreting β-cells and play regulatory roles in insulin secretion. Non-insulin dependent diabetes mellitus (type 2 diabetes) is a disease characterized by impaired insulin secretion and insulin resistance. Exocytotic protein immunoreactivities were studied in pancreatic islets of type 2 diabetic Goto-Kakizaki (GK) rats using immunofluorescence histochemistry. The immunoreactivities for vesicle-associated membrane protein-2 (VAMP-2), synaptotag-min III, cysteine string protein (CSP), mammalian homologue of the unc-18 gene (Munc-18), α-soluble N-ethylmaleimide-sensitive attachment protein (α-SNAP), N-ethylmaleimide-sensitive factor (NSF) and synaptosomal-associated protein of 25 kDa (SNAP-25) exhibited weaker immunofluorescence intensity in islets of GK rats as compared to control Wistar rats. Insulin immunoreactivity was also decreased in GK rat β-cells, whereas no detectable alterations in the expression of actin immunoreactivity could be detected. The data suggest that reduced expression of exocytotic proteins and decreased insulin content may contribute to the diabetic syndrome in the GK rat.",

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author = "Wei Zhang and Akhtar Khan and {\"O}stenson, {Claes Goran} and Berggren, {Per Olof} and Suad Efendic and Bj{\"o}rn Meister",

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AU - Zhang, Wei

AU - Khan, Akhtar

AU - Östenson, Claes Goran

AU - Berggren, Per Olof

AU - Efendic, Suad

AU - Meister, Björn

PY - 2002/3/8

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N2 - Exocytosis is regulated by exocytotic proteins, which are present in insulin-secreting β-cells and play regulatory roles in insulin secretion. Non-insulin dependent diabetes mellitus (type 2 diabetes) is a disease characterized by impaired insulin secretion and insulin resistance. Exocytotic protein immunoreactivities were studied in pancreatic islets of type 2 diabetic Goto-Kakizaki (GK) rats using immunofluorescence histochemistry. The immunoreactivities for vesicle-associated membrane protein-2 (VAMP-2), synaptotag-min III, cysteine string protein (CSP), mammalian homologue of the unc-18 gene (Munc-18), α-soluble N-ethylmaleimide-sensitive attachment protein (α-SNAP), N-ethylmaleimide-sensitive factor (NSF) and synaptosomal-associated protein of 25 kDa (SNAP-25) exhibited weaker immunofluorescence intensity in islets of GK rats as compared to control Wistar rats. Insulin immunoreactivity was also decreased in GK rat β-cells, whereas no detectable alterations in the expression of actin immunoreactivity could be detected. The data suggest that reduced expression of exocytotic proteins and decreased insulin content may contribute to the diabetic syndrome in the GK rat.

AB - Exocytosis is regulated by exocytotic proteins, which are present in insulin-secreting β-cells and play regulatory roles in insulin secretion. Non-insulin dependent diabetes mellitus (type 2 diabetes) is a disease characterized by impaired insulin secretion and insulin resistance. Exocytotic protein immunoreactivities were studied in pancreatic islets of type 2 diabetic Goto-Kakizaki (GK) rats using immunofluorescence histochemistry. The immunoreactivities for vesicle-associated membrane protein-2 (VAMP-2), synaptotag-min III, cysteine string protein (CSP), mammalian homologue of the unc-18 gene (Munc-18), α-soluble N-ethylmaleimide-sensitive attachment protein (α-SNAP), N-ethylmaleimide-sensitive factor (NSF) and synaptosomal-associated protein of 25 kDa (SNAP-25) exhibited weaker immunofluorescence intensity in islets of GK rats as compared to control Wistar rats. Insulin immunoreactivity was also decreased in GK rat β-cells, whereas no detectable alterations in the expression of actin immunoreactivity could be detected. The data suggest that reduced expression of exocytotic proteins and decreased insulin content may contribute to the diabetic syndrome in the GK rat.

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