Global cerebral ischemia caused by cardiac arrest results in many neurological sequelae, including deficits in learning and memory. These deficits are as evident in children as they are in adults. The resulting neurological sequelae from cardiac arrest (CA) in children likely arise from both neuronal death and altered physiology in surviving neurons. TRPM2 channels are non-selective ion channels that are activated by hyperoxidative stress and are compelling targets in preventing neurotoxicity and cellular dysfunction. Our lab has recently designed a novel inhibitor of TRPM2 channels, known as tatM2NX, to better understand the role of TRPM2 in neuronal death and dysfunction. A useful measure to assess neuronal dysfunction is to investigate the level of synaptic function. The ability for neurons to undergo synaptic plasticity (long-term potentiation; LTP) in the hippocampus is recognized as an innate measure of function and is a widely accepted cellular model for learning and memory. This proposal makes use of a novel cardiac arrest model in juvenile mice (p21-25) to investigate the hypothesis that activation of TRPM2 channels contributes to impairment of synaptic function and cognitive deficits following global cerebral ischemia. We have found that inhibiting TRPM2 soon after juvenile CA leads to preservation of synaptic function, despite no significant change in neuronal death. We will further test the hypothesis by inhibiting TRPM2 at delayed time points (7-14 days after PCA). Inhibition of TRPM2 will be done with pharmacology (in vivo tatM2NX) or genetic modulation (TRPM2-/-, lentiviral shRNA TRPM2 knockdown) and function will be assessed by electrophysiology and behavior. Preliminary data suggest that delayed inhibition of TRPM2 reverses synaptic impairments after CA. We will use signal transduction techniques to identify the mechanism for synaptic impairment after ischemia-induced TRPM2 activation. We will focus on the hypothesis that activation of TRPM2 signals calcineurin, leading to decreased synaptic function. Finally, we have found that while ischemia in young animals results in impairment of synaptic function up to 14 days after CA, there is remarkable endogenous recovery to control levels.
The final aim of the project will investigate the role of developmental changes in TRPM2 expression in neurons through puberty into adulthood that may account for endogenous recovery of impaired synaptic function. Overall, this project has high translational potential through the opportunity of redefining therapeutic windows after global cerebral ischemia in children. Experiments outlined in this proposal will provide important training for an independent research career. In this proposal, I will learn hippocampal lentivirus shRNA transfection, behavior testing, and signal transduction techniques to assess protein expression and function. The mentor team assembled has experience and expertise to assure completion of this project. Upon completion of this proposal, I will combine these skills with electrophysiology techniques that I am already familiar with and apply for an R01 to further characterize TRPM2 activity in the maturing juvenile mouse after cardiac arrest. The impact of this work will be in establishing a novel therapeutic strategy to improve neurological consequences of ischemia in the young brain.

Public Health Relevance

This research proposal aims to examine the role of the non-selective ion channel TRPM2 in injury mechanisms and functional consequences after a juvenile model of cardiac arrest. These studies will reveal that TRPM2 channels are novel therapeutic targets after cardiac arrest and their inhibition will redefine the therapeutic window after global cerebral ischemia.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Clinical Investigator Award (CIA) (K08)
Project #
5K08NS097586-02
Application #
9527885
Study Section
Neurological Sciences Training Initial Review Group (NST)
Program Officer
Koenig, James I
Project Start
2017-07-15
Project End
2022-06-30
Budget Start
2018-07-01
Budget End
2019-06-30
Support Year
2
Fiscal Year
2018
Total Cost
Indirect Cost
Name
University of Colorado Denver
Department
Pediatrics
Type
Schools of Medicine
DUNS #
041096314
City
Aurora
State
CO
Country
United States
Zip Code
80045
Dietz, Robert M; Wright, Clyde J (2018) Oxidative stress diseases unique to the perinatal period: A window into the developing innate immune response. Am J Reprod Immunol 79:e12787
Bourque, Stephanie L; Dietz, Robert M (2018) Does late therapeutic hypothermia reduce risk of death or disability? Acta Paediatr 107:1103
Dietz, Robert M; Orfila, James E; Rodgers, Krista M et al. (2018) Juvenile cerebral ischemia reveals age-dependent BDNF-TrkB signaling changes: Novel mechanism of recovery and therapeutic intervention. J Cereb Blood Flow Metab 38:2223-2235