Brain Endothelial Cells & Neuroinflammation: TTUHSC Research
Unraveling the Link Between Prostaglandins, UCH Function, adn Traumatic Brain Injury
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New research aims too shed light on how sugar metabolism and vascular dysfunction contribute to cognitive impairment after TBI.
traumatic Brain Injury (TBI) can lead to significant vascular dysfunction and cognitive impairment,but the precise mechanisms driving these debilitating effects remain incompletely understood. A new research initiative is poised to explore a critical, yet understudied, interaction: the role of prostaglandins in modulating the function of Ubiquitin Carboxylase Hydrolase (UCH) and its subsequent impact on brain sugar processing and vascular integrity following TBI.
Prostaglandins and UCH: A Complex Relationship in TBI
Prostaglandins are signaling molecules known to disrupt vascular homeostasis. Simultaneously, research indicates that UCH function, crucial for cellular processes, is partially inhibited by prostaglandins released during inflammation. This interplay forms the core of the new investigation.
“Whereas prostaglandin production is known to disrupt vascular homeostasis,and because UCH function is inhibited,in part,by prostaglandins that are released under inflammation,we seek to explore the role of prostaglandin-UCH interactions on TBI-induced vascular dysfunction,” explained lead researcher,Logsdon.
Investigating Prostaglandin Resistance in UCH Mutants
A key component of this research involves the utilization of specially developed mice. These mice possess a genetic mutation in the UCH protein, rendering it resistant to the inhibitory effects of prostaglandins. These unique UCH mutant mice were generously provided by Steven H. Graham, M.D.,Ph.D.,from the University of Pittsburgh.
Previous studies have suggested that these UCH mutant mice exhibit protection from neuroinflammation and maintain preserved cognitive function after stroke and TBI. However, the impact of this prostaglandin resistance on vascular function in these models has not yet been explored. This grant will facilitate the investigation into this critical aspect.
Beyond Protein Homeostasis: Sugar Metabolism in the Injured Brain
Historically, the focus of UCH activity in neurons has been on maintaining protein homeostasis. however, Logsdon’s lab has been investigating a different, yet potentially interconnected, aspect: brain sugar composition and its differential processing under normal, aging, and inflammatory conditions.
“My lab focuses on brain sugar composition and how sugars are differentially processed within the brain under normal and aging conditions,” Logsdon stated. ”Under inflammatory conditions, sugars are aberrantly processed and may even accumulate to disrupt cellular homeostasis – much like how proteins accumulate in neurocognitive disorders, such as Alzheimer’s disease.”
Aberrant Sugar processing: A Novel TBI Mechanism?
Logsdon’s prior research has revealed distinct sugar processing patterns in the brains of individuals with Alzheimer’s disease compared to those without cognitive impairment.Crucially, a similar aberrant sugar pattern was observed in the brains of mice subjected to TBI.This suggests that the abnormal processing and potential accumulation of sugars in the brain could be an early driver of cognitive impairment following injury.
The hypothesis is that by alleviating sugar accumulation under injury conditions, the burden of chronic inflammation could be reduced. Logsdon’s current focus is on elucidating the mechanisms behind this aberrant sugar production and accumulation as a novel contributor to TBI-related cognitive impairment.
“I think the sugars are accumulating over time, in part, through this aforementioned UCH system,” Logsdon commented. “That’s the goal of this research: to block the UCH system and determine whether we observe proper brain sugar processing and an improvement in neurovascular function in mice exposed to TBI. We predict that a functional UCH system will drive normal sugar processing in the brain and thereby maintain the integrity of the blood-brain barrier, even after TBI.”
Therapeutic Potential for TBI and Beyond
The research team plans to utilize indomethacin, an FDA-approved drug known to inhibit prostaglandin production, to explore the effects of blocking prostaglandin-related vascular dysfunction. By combining this approach with the study of UCH mutant mice, they aim to demonstrate whether sugars are processed normally and do not accumulate in the brain.
“If we can successfully block prostaglandin-related vascular dysfunction, and – in using the UCH mutant mice - we can show that sugars are processed normally and not accumulating in the brain, we may have discovered aberrant sugar processing as a novel therapeutic target for TBI, and possibly for Alzheimer’s disease as well,” Logsdon concluded.
This groundbreaking research holds the potential to uncover new therapeutic strategies for mitigating the long-term cognitive consequences of TBI and may offer insights into the mechanisms underlying other neurodegenerative conditions like Alzheimer’s disease.
Source:* Texas Tech university Health sciences Center