Format

Send to

Choose Destination
Mol Neurobiol. 2019 Apr;56(4):2822-2835. doi: 10.1007/s12035-018-1258-7. Epub 2018 Jul 31.

Contribution of Zinc-Dependent Delayed Calcium Influx via TRPC5 in Oxidative Neuronal Death and its Prevention by Novel TRPC Antagonist.

Author information

1
Asan Institute for Life Sciences, Asan Medical Center, Seoul, 05505, South Korea.
2
Department of Physiology, Chosun University School of Medicine, Kwangju, 61452, South Korea.
3
Neural Injury Research Lab, University of Ulsan College of Medicine, Seoul, 05505, South Korea.
4
Department of Physiology and Institute of Dermatological Science, Seoul National University College of Medicine, Seoul, 110-799, South Korea.
5
Department of Convergence Medicine, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-Gu, Seoul, 05505, South Korea.
6
Department of Cardiology, Boston Children's Hospital, Boston, MA, USA.
7
Department of Neurobiology, Harvard Medical School, Boston, MA, USA.
8
Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea.
9
Neural Injury Research Lab, University of Ulsan College of Medicine, Seoul, 05505, South Korea. jkko@amc.seoul.kr.
10
Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-Gu, Seoul, 05505, South Korea. jkko@amc.seoul.kr.
11
Asan Institute for Life Sciences, Asan Medical Center, Seoul, 05505, South Korea. jjhwang@amc.seoul.kr.
12
Department of Convergence Medicine, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-Gu, Seoul, 05505, South Korea. jjhwang@amc.seoul.kr.

Abstract

Oxidative stress is a key mediator of neuronal death in acute brain injuries, such as epilepsy, trauma, and stroke. Although it is accompanied by diverse cellular changes, increases in levels of intracellular zinc ion (Zn2+) and calcium ion (Ca2+) may play a critical causative role in oxidative neuronal death. However, the mechanistic link between Zn2+ and Ca2+ dyshomeostasis in neurons during oxidative stress is not well-understood. Here, we show that the exposure of cortical neurons to H2O2 led to a zinc-triggered calcium influx, which resulted in neuronal death. The cyclin-dependent kinase inhibitor, NU6027, inhibited H2O2-induced Ca2+ increases and subsequent cell death in cortical neurons, without affecting the early increase in Zn2+. Therefore, we attempted to identify the zinc-regulated Ca2+ pathway that was inhibited by NU6027. The expression profile in cortical neurons identified transient receptor potential cation channel 5 (TRPC5) as a candidate that is known to involve in the generation of epileptiform burst firing and epileptic neuronal death (Phelan KD et al. 2012a; Phelan KD et al. 2013b). NU6027 inhibited basal and zinc-augmented TRPC5 currents in TRPC5-overexpressing HEK293 cells. Consistently, cortical neurons from TRPC5 knockout mice were highly resistant to H2O2-induced death. Moreover, NU6027 is neuroprotective in kainate-treated epileptic rats. Our results demonstrate that TRPC5 is a novel therapeutic target against oxidative neuronal injury in prolonged seizures and that NU6027 is a potent inhibitor of TRPC5.

KEYWORDS:

Ca2+; H2O2; NU6027; Seizure; TRPC; Zn2+

Supplemental Content

Full text links

Icon for Springer Icon for PubMed Central
Loading ...
Support Center