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2014 ; 15
(6
): 714-22
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BIG3 inhibits insulin granule biogenesis and insulin secretion
#MMPMID24711543
Li H
; Wei S
; Cheng K
; Gounko NV
; Ericksen RE
; Xu A
; Hong W
; Han W
EMBO Rep
2014[Jun]; 15
(6
): 714-22
PMID24711543
show ga
While molecular regulation of insulin granule exocytosis is relatively well
understood, insulin granule biogenesis and maturation and its influence on
glucose homeostasis are relatively unclear. Here, we identify a novel protein
highly expressed in insulin-secreting cells and name it BIG3 due to its
similarity to BIG/GBF of the Arf-GTP exchange factor (GEF) family. BIG3 is
predominantly localized to insulin- and clathrin-positive trans-Golgi network
(TGN) compartments. BIG3-deficient insulin-secreting cells display increased
insulin content and granule number and elevated insulin secretion upon
stimulation. Moreover, BIG3 deficiency results in faster processing of proinsulin
to insulin and chromogranin A to ?-granin in ?-cells. BIG3-knockout mice exhibit
postprandial hyperinsulinemia, hyperglycemia, impaired glucose tolerance, and
insulin resistance. Collectively, these results demonstrate that BIG3 negatively
modulates insulin granule biogenesis and insulin secretion and participates in
the regulation of systemic glucose homeostasis.
|Animals
[MESH]
|Calorimetry, Indirect
[MESH]
|Glucose/physiology
[MESH]
|Homeostasis/*genetics/physiology
[MESH]
|Hyperglycemia/genetics
[MESH]
|Insulin Resistance/genetics
[MESH]
|Insulin Secretion
[MESH]
|Insulin-Secreting Cells/*metabolism
[MESH]
|Insulin/analysis/*metabolism
[MESH]
|Intracellular Signaling Peptides and Proteins
[MESH]