TY - JOUR
T1 - PKCδ-dependent p47phox activation mediates methamphetamine-induced dopaminergic neurotoxicity
AU - Dang, Duy Khanh
AU - Shin, Eun Joo
AU - Kim, Dae Joong
AU - Tran, Hai Quyen
AU - Jeong, Ji Hoon
AU - Jang, Choon Gon
AU - Ottersen, Ole Petter
AU - Nah, Seung Yeol
AU - Hong, Jau Shyong
AU - Nabeshima, Toshitaka
AU - Kim, Hyoung Chun
N1 - Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Protein kinase C (PKC) has been recognized to activate NADPH oxidase (PHOX). However, the interaction between PKC and PHOX in vivo remains elusive. Treatment with methamphetamine (MA) resulted in a selective increase in PKCδ expression out of PKC isoforms. PKCδ co-immunoprecipitated with p47phox, and facilitated phosphorylation and membrane translocation of p47phox. MA-induced increases in PHOX activity and reactive oxygen species were attenuated by knockout of p47phox or PKCδ. In addition, MA-induced impairments in the Nrf-2-related glutathione synthetic system were also mitigated by knockout of p47phox or PKCδ. Glutathione-immunoreactivity was co-localized in Iba-1-labeled microglial cells and in NeuN-labeled neurons, but not in GFAP-labeled astrocytes, reflecting the necessity for self-protection against oxidative stress by mainly microglia. Buthionine-sulfoximine, an inhibitor of glutathione biosynthesis, potentiated microglial activation and pro-apoptotic changes, leading to dopaminergic losses. These neurotoxic processes were attenuated by rottlerin, a pharmacological inhibitor of PKCδ, genetic inhibitions of PKCδ [i.e., PKCδ knockout mice (KO) and PKCδ antisense oligonucleotide (ASO)], or genetic inhibition of p47phox (i.e., p47phox KO or p47phox ASO). Rottlerin did not exhibit any additive effects against the protective activity offered by genetic inhibition of p47phox. Therefore, we suggest that PKCδ is a critical regulator for p47phox activation induced by MA, and that Nrf-2-dependent GSH induction via inhibition of PKCδ or p47phox, is important for dopaminergic protection against MA insult.
AB - Protein kinase C (PKC) has been recognized to activate NADPH oxidase (PHOX). However, the interaction between PKC and PHOX in vivo remains elusive. Treatment with methamphetamine (MA) resulted in a selective increase in PKCδ expression out of PKC isoforms. PKCδ co-immunoprecipitated with p47phox, and facilitated phosphorylation and membrane translocation of p47phox. MA-induced increases in PHOX activity and reactive oxygen species were attenuated by knockout of p47phox or PKCδ. In addition, MA-induced impairments in the Nrf-2-related glutathione synthetic system were also mitigated by knockout of p47phox or PKCδ. Glutathione-immunoreactivity was co-localized in Iba-1-labeled microglial cells and in NeuN-labeled neurons, but not in GFAP-labeled astrocytes, reflecting the necessity for self-protection against oxidative stress by mainly microglia. Buthionine-sulfoximine, an inhibitor of glutathione biosynthesis, potentiated microglial activation and pro-apoptotic changes, leading to dopaminergic losses. These neurotoxic processes were attenuated by rottlerin, a pharmacological inhibitor of PKCδ, genetic inhibitions of PKCδ [i.e., PKCδ knockout mice (KO) and PKCδ antisense oligonucleotide (ASO)], or genetic inhibition of p47phox (i.e., p47phox KO or p47phox ASO). Rottlerin did not exhibit any additive effects against the protective activity offered by genetic inhibition of p47phox. Therefore, we suggest that PKCδ is a critical regulator for p47phox activation induced by MA, and that Nrf-2-dependent GSH induction via inhibition of PKCδ or p47phox, is important for dopaminergic protection against MA insult.
KW - 47phox antisense oligonucleotide
KW - Dopamine
KW - Glutathione-immunoreactivity
KW - Methamphetamine
KW - Microglia
KW - Nrf2-transcription factor
KW - PKCδ antisense oligonucleotide
KW - PKCδ knockout mice
KW - Pro-apoptosis
KW - Striatum
KW - p47phox knockout mice
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U2 - 10.1016/j.freeradbiomed.2017.12.018
DO - 10.1016/j.freeradbiomed.2017.12.018
M3 - Article
C2 - 29269308
AN - SCOPUS:85038821090
SN - 0891-5849
VL - 115
SP - 318
EP - 337
JO - Free Radical Biology and Medicine
JF - Free Radical Biology and Medicine
ER -