Abstract
NAADP (nicotinic acid adenine dinucleotide phosphate) has been proposed as a second messenger for glutamate in neuronal and glial cells via the activation of the lysosomal Ca2+ channels TPC1 and TPC2. However, the activities of glutamate that are mediated by NAADP remain unclear. In this study, we evaluated the effect of glutamate on autophagy in astrocytes at physiological, non-toxic concentration. We found that glutamate induces autophagy at similar extent as NAADP. By contrast, the NAADP antagonist NED-19 or SiRNA-mediated inhibition of TPC1/2 decreases autophagy induced by glutamate, confirming a role for NAADP in this pathway. The involvement of TPC1/2 in glutamate-induced autophagy was also confirmed in SHSY5Y neuroblastoma cells. Finally, we show that glutamate leads to a NAADP-dependent activation of AMPK, which is required for autophagy induction, while mTOR activity is not affected by this treatment. Taken together, our results indicate that glutamate stimulates autophagy via NAADP/TPC/AMPK axis, providing new insights of how Ca2+ signalling glutamate-mediated can control the cell metabolism in the central nervous system.
| Original language | English |
|---|---|
| Journal | Oncotarget |
| DOIs | |
| Publication status | E-pub ahead of print - Dec 31 2016 |
Fingerprint
Keywords
- Journal Article
Cite this
Glutamate induces autophagy via the two-pore channels in neural cells. / Pereira, Gustavo J S; Antonioli, Manuela; Hirata, Hanako; Ureshino, Rodrigo P.; Nascimento, Aline R; Bincoletto, Claudia; Vescovo, Tiziana; Piacentini, Mauro; Fimia, Gian Maria; Smaili, Soraya S.
In: Oncotarget, 31.12.2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Glutamate induces autophagy via the two-pore channels in neural cells
AU - Pereira, Gustavo J S
AU - Antonioli, Manuela
AU - Hirata, Hanako
AU - Ureshino, Rodrigo P.
AU - Nascimento, Aline R
AU - Bincoletto, Claudia
AU - Vescovo, Tiziana
AU - Piacentini, Mauro
AU - Fimia, Gian Maria
AU - Smaili, Soraya S.
PY - 2016/12/31
Y1 - 2016/12/31
N2 - NAADP (nicotinic acid adenine dinucleotide phosphate) has been proposed as a second messenger for glutamate in neuronal and glial cells via the activation of the lysosomal Ca2+ channels TPC1 and TPC2. However, the activities of glutamate that are mediated by NAADP remain unclear. In this study, we evaluated the effect of glutamate on autophagy in astrocytes at physiological, non-toxic concentration. We found that glutamate induces autophagy at similar extent as NAADP. By contrast, the NAADP antagonist NED-19 or SiRNA-mediated inhibition of TPC1/2 decreases autophagy induced by glutamate, confirming a role for NAADP in this pathway. The involvement of TPC1/2 in glutamate-induced autophagy was also confirmed in SHSY5Y neuroblastoma cells. Finally, we show that glutamate leads to a NAADP-dependent activation of AMPK, which is required for autophagy induction, while mTOR activity is not affected by this treatment. Taken together, our results indicate that glutamate stimulates autophagy via NAADP/TPC/AMPK axis, providing new insights of how Ca2+ signalling glutamate-mediated can control the cell metabolism in the central nervous system.
AB - NAADP (nicotinic acid adenine dinucleotide phosphate) has been proposed as a second messenger for glutamate in neuronal and glial cells via the activation of the lysosomal Ca2+ channels TPC1 and TPC2. However, the activities of glutamate that are mediated by NAADP remain unclear. In this study, we evaluated the effect of glutamate on autophagy in astrocytes at physiological, non-toxic concentration. We found that glutamate induces autophagy at similar extent as NAADP. By contrast, the NAADP antagonist NED-19 or SiRNA-mediated inhibition of TPC1/2 decreases autophagy induced by glutamate, confirming a role for NAADP in this pathway. The involvement of TPC1/2 in glutamate-induced autophagy was also confirmed in SHSY5Y neuroblastoma cells. Finally, we show that glutamate leads to a NAADP-dependent activation of AMPK, which is required for autophagy induction, while mTOR activity is not affected by this treatment. Taken together, our results indicate that glutamate stimulates autophagy via NAADP/TPC/AMPK axis, providing new insights of how Ca2+ signalling glutamate-mediated can control the cell metabolism in the central nervous system.
KW - Journal Article
U2 - 10.18632/oncotarget.14404
DO - 10.18632/oncotarget.14404
M3 - Article
JO - Oncotarget
JF - Oncotarget
SN - 1949-2553
ER -