Abstract
Disturbances in Ca2+ homeostasis have been implicated in a variety of neuropathological conditions including Parkinson's disease (PD). However, the importance of store-operated Ca2+ entry (SOCE) channels in PD remains to be investigated. In the present study, we have scrutinized the significance of TRPC1 in 1-methyl-4-phenyl-1,2,3,6-tetrahyrdro-pyridine (MPTP)-induced PD using C57BL/6 animal model and PC12 cell culture model. Both sub-acute and sub-chronic treatments of MPTP significantly reduced TRPC1, and tyrosine hydroxylase levels, but not TRPC3, along with increased neuronal death. Furthermore, MPTP induces mitochondrial dysfunction, which was associated with reduced mitochondrial membrane potential, decreased level of Bcl2, Bcl-xl, and an altered Bcl-xl/Bax ratio thereby initiating apoptosis. Importantly, TRPC1 overexpression in PC12 cells showed significant protection against MPP+ induced neuronal apoptosis, which was attributed to the restoration of cytosolic Ca2+ and preventing loss of mitochondrial membrane potential. Silencing of TRPC1 or addition of TRPC1 channel blockers decreased mitochondrial membrane potential, whereas activation of TRPC1 restored mitochondrial membrane potential in cells overexpressing TRPC1. TRPC1 overexpression also inhibited Bax translocation to the mitochondria and thereby prevented cytochrome c release and mitochondrial-mediated apoptosis. Overall, these results provide compelling evidence for the role of TRPC1 in either onset/progression of PD and restoration of TRPC1 levels could limit neuronal degeneration in MPTP mediated PD.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 209-218 |
| Number of pages | 10 |
| Journal | Cell Calcium |
| Volume | 46 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jan 1 2009 |
| Externally published | Yes |
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Keywords
- Apoptosis
- Calcium
- Mitochondria
- MPTP
- Parkinson's disease
- TRPC1
ASJC Scopus subject areas
- Physiology
- Molecular Biology
- Cell Biology
Cite this
TRPC1 inhibits apoptotic cell degeneration induced by dopaminergic neurotoxin MPTP/MPP+ . / Selvaraj, Senthil; Watt, John A.; Singh, Brij B.
In: Cell Calcium, Vol. 46, No. 3, 01.01.2009, p. 209-218.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - TRPC1 inhibits apoptotic cell degeneration induced by dopaminergic neurotoxin MPTP/MPP+
AU - Selvaraj, Senthil
AU - Watt, John A.
AU - Singh, Brij B
PY - 2009/1/1
Y1 - 2009/1/1
N2 - Disturbances in Ca2+ homeostasis have been implicated in a variety of neuropathological conditions including Parkinson's disease (PD). However, the importance of store-operated Ca2+ entry (SOCE) channels in PD remains to be investigated. In the present study, we have scrutinized the significance of TRPC1 in 1-methyl-4-phenyl-1,2,3,6-tetrahyrdro-pyridine (MPTP)-induced PD using C57BL/6 animal model and PC12 cell culture model. Both sub-acute and sub-chronic treatments of MPTP significantly reduced TRPC1, and tyrosine hydroxylase levels, but not TRPC3, along with increased neuronal death. Furthermore, MPTP induces mitochondrial dysfunction, which was associated with reduced mitochondrial membrane potential, decreased level of Bcl2, Bcl-xl, and an altered Bcl-xl/Bax ratio thereby initiating apoptosis. Importantly, TRPC1 overexpression in PC12 cells showed significant protection against MPP+ induced neuronal apoptosis, which was attributed to the restoration of cytosolic Ca2+ and preventing loss of mitochondrial membrane potential. Silencing of TRPC1 or addition of TRPC1 channel blockers decreased mitochondrial membrane potential, whereas activation of TRPC1 restored mitochondrial membrane potential in cells overexpressing TRPC1. TRPC1 overexpression also inhibited Bax translocation to the mitochondria and thereby prevented cytochrome c release and mitochondrial-mediated apoptosis. Overall, these results provide compelling evidence for the role of TRPC1 in either onset/progression of PD and restoration of TRPC1 levels could limit neuronal degeneration in MPTP mediated PD.
AB - Disturbances in Ca2+ homeostasis have been implicated in a variety of neuropathological conditions including Parkinson's disease (PD). However, the importance of store-operated Ca2+ entry (SOCE) channels in PD remains to be investigated. In the present study, we have scrutinized the significance of TRPC1 in 1-methyl-4-phenyl-1,2,3,6-tetrahyrdro-pyridine (MPTP)-induced PD using C57BL/6 animal model and PC12 cell culture model. Both sub-acute and sub-chronic treatments of MPTP significantly reduced TRPC1, and tyrosine hydroxylase levels, but not TRPC3, along with increased neuronal death. Furthermore, MPTP induces mitochondrial dysfunction, which was associated with reduced mitochondrial membrane potential, decreased level of Bcl2, Bcl-xl, and an altered Bcl-xl/Bax ratio thereby initiating apoptosis. Importantly, TRPC1 overexpression in PC12 cells showed significant protection against MPP+ induced neuronal apoptosis, which was attributed to the restoration of cytosolic Ca2+ and preventing loss of mitochondrial membrane potential. Silencing of TRPC1 or addition of TRPC1 channel blockers decreased mitochondrial membrane potential, whereas activation of TRPC1 restored mitochondrial membrane potential in cells overexpressing TRPC1. TRPC1 overexpression also inhibited Bax translocation to the mitochondria and thereby prevented cytochrome c release and mitochondrial-mediated apoptosis. Overall, these results provide compelling evidence for the role of TRPC1 in either onset/progression of PD and restoration of TRPC1 levels could limit neuronal degeneration in MPTP mediated PD.
KW - Apoptosis
KW - Calcium
KW - Mitochondria
KW - MPTP
KW - Parkinson's disease
KW - TRPC1
UR - http://www.scopus.com/inward/record.url?scp=69249213384&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=69249213384&partnerID=8YFLogxK
U2 - 10.1016/j.ceca.2009.07.008
DO - 10.1016/j.ceca.2009.07.008
M3 - Article
C2 - 19695701
AN - SCOPUS:69249213384
VL - 46
SP - 209
EP - 218
JO - Cell Calcium
JF - Cell Calcium
SN - 0143-4160
IS - 3
ER -