Abstract
In adipocytes and myocytes, insulin stimulation translocates glucose transporter 4 (Glut4) storage vesicles (GSVs) from their intracellular storage sites to the plasma membrane (PM) where they dock with the PM. Then, Glut4 is inserted into the PM and initiates glucose uptake into these cells. Previous studies using chemical inhibitors demonstrated that myosin II participates in fusion of GSVs and the PM and increase in the intrinsic activity of Glut4. In this study, the effect of myosin IIA on GSV trafficking was examined by knocking down myosin IIA expression. Myosin IIA knockdown decreased both glucose uptake and exposures of myc-tagged Glut4 to the cell surface in insulin-stimulated cells, but did not affect insulin signal transduction. Interestingly, myosin IIA knockdown failed to decrease insulin-dependent trafficking of Glut4 to the PM. Moreover, in myosin IIA knockdown cells, insulin-stimulated binding of GSV SNARE protein, vesicle-associated membrane protein 2 (VAMP2) to PM SNARE protein, syntaxin 4 was inhibited. These data suggest that myosin IIA plays a role in insulin-stimulated docking of GSVs to the PM in 3T3-L1 adipocytes through SNARE complex formation.
| Original language | English |
|---|---|
| Pages (from-to) | 995-999 |
| Number of pages | 5 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 391 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 1 2010 |
| Externally published | Yes |
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Keywords
- Glut4
- Myosin IIA
- Syntaxin 4
- VAMP2
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Cell Biology
- Molecular Biology
Cite this
Myosin IIA participates in docking of Glut4 storage vesicles with the plasma membrane in 3T3-L1 adipocytes. / Chung, Le Thi Kim; Hosaka, Toshio; Harada, Nagakatsu; Jambaldorj, Bayasgalan; Fukunaga, Keiko; Nishiwaki, Yuka; Teshigawara, Kiyoshi; Sakai, Tohru; Nakaya, Yutaka; Funaki, Makoto.
In: Biochemical and Biophysical Research Communications, Vol. 391, No. 1, 01.01.2010, p. 995-999.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Myosin IIA participates in docking of Glut4 storage vesicles with the plasma membrane in 3T3-L1 adipocytes
AU - Chung, Le Thi Kim
AU - Hosaka, Toshio
AU - Harada, Nagakatsu
AU - Jambaldorj, Bayasgalan
AU - Fukunaga, Keiko
AU - Nishiwaki, Yuka
AU - Teshigawara, Kiyoshi
AU - Sakai, Tohru
AU - Nakaya, Yutaka
AU - Funaki, Makoto
PY - 2010/1/1
Y1 - 2010/1/1
N2 - In adipocytes and myocytes, insulin stimulation translocates glucose transporter 4 (Glut4) storage vesicles (GSVs) from their intracellular storage sites to the plasma membrane (PM) where they dock with the PM. Then, Glut4 is inserted into the PM and initiates glucose uptake into these cells. Previous studies using chemical inhibitors demonstrated that myosin II participates in fusion of GSVs and the PM and increase in the intrinsic activity of Glut4. In this study, the effect of myosin IIA on GSV trafficking was examined by knocking down myosin IIA expression. Myosin IIA knockdown decreased both glucose uptake and exposures of myc-tagged Glut4 to the cell surface in insulin-stimulated cells, but did not affect insulin signal transduction. Interestingly, myosin IIA knockdown failed to decrease insulin-dependent trafficking of Glut4 to the PM. Moreover, in myosin IIA knockdown cells, insulin-stimulated binding of GSV SNARE protein, vesicle-associated membrane protein 2 (VAMP2) to PM SNARE protein, syntaxin 4 was inhibited. These data suggest that myosin IIA plays a role in insulin-stimulated docking of GSVs to the PM in 3T3-L1 adipocytes through SNARE complex formation.
AB - In adipocytes and myocytes, insulin stimulation translocates glucose transporter 4 (Glut4) storage vesicles (GSVs) from their intracellular storage sites to the plasma membrane (PM) where they dock with the PM. Then, Glut4 is inserted into the PM and initiates glucose uptake into these cells. Previous studies using chemical inhibitors demonstrated that myosin II participates in fusion of GSVs and the PM and increase in the intrinsic activity of Glut4. In this study, the effect of myosin IIA on GSV trafficking was examined by knocking down myosin IIA expression. Myosin IIA knockdown decreased both glucose uptake and exposures of myc-tagged Glut4 to the cell surface in insulin-stimulated cells, but did not affect insulin signal transduction. Interestingly, myosin IIA knockdown failed to decrease insulin-dependent trafficking of Glut4 to the PM. Moreover, in myosin IIA knockdown cells, insulin-stimulated binding of GSV SNARE protein, vesicle-associated membrane protein 2 (VAMP2) to PM SNARE protein, syntaxin 4 was inhibited. These data suggest that myosin IIA plays a role in insulin-stimulated docking of GSVs to the PM in 3T3-L1 adipocytes through SNARE complex formation.
KW - Glut4
KW - Myosin IIA
KW - Syntaxin 4
KW - VAMP2
UR - http://www.scopus.com/inward/record.url?scp=72949104129&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=72949104129&partnerID=8YFLogxK
U2 - 10.1016/j.bbrc.2009.12.004
DO - 10.1016/j.bbrc.2009.12.004
M3 - Article
VL - 391
SP - 995
EP - 999
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
SN - 0006-291X
IS - 1
ER -