Traumatic brain injury (TBI) remains a major public health problem and is on pace to become the third leading cause of death and disability in the world population by 2020. Although we know that both neuronal degeneration and cognitive deficits are common features of human TBI, we are only beginning to appreciate an entirely new dimension of the disease: how brain networks change immediately after injury, and how cognitive recovery may depend critically on rebuilding these networks. The broad, long-term goal of our work identifies the fundamental mechanisms on how neural activity and intracellular signaling pathways together contribute to rebuilding a circuit after TBI. To our knowledge, our preliminary data is the first evidence showing how the structure of neural circuits changes after TBI, and the first observation on how combining circuit activation with pharmaceutics can together rebuild a network. We build on our preliminary data and propose the following aims:
Specific Aim 1 : To examine mechanisms of neuronal disconnection from a network after mechanical injury in vitro and in vivo.
Specific Aim 2 : To determine mechanisms for the activity-induced re-integration of neurons into an injured microcircuit over time. Our general hypotheses are: (a) Connectivity directly influences neuronal disconnection from a network following injury, as well as network recovery (b) neuronal re-integration into the network is mediated by calcineurin activity and CREB-phosphorylation, (c) neuronal disconnection is mediated by mitochondrial signaling, and (d) prolonged circuit activation, in combination with pharmaceutics, can optimally control the reconstruction of networks. Impact: Knowing the mechanisms for remodeling neuronal connections in a circuit over time after TBI will give us insight into treatments protecting the network structure. Once the mechanisms for remodeling circuitry after TBI are better understood, we envision testing therapies in preclinical TBI models within the next 5-10 years. Broadly, we believe this work will shift the therapeutic focus away from reducing neuronal death and towards approaches to rebuild functional circuits after TBI.
Traumatic brain injury (TBI) is a pervasive public health problem, yet we know very little about how changes to the structure and function of brain networks relate to cognitive deficits in TBI patients. In this project, we study how the changes in the wiring and connection strength among neurons in a circuit are related to characteristics or 'phenotypes'of individual neurons within the circuit, and we identify the key mechanisms that regulate the remodeling of these connections. Our goal is to understand how to optimize the re-integration of neurons into the larger circuit to improve recovery after TBI.