Alterations to endothelial membrane composition and structure as a driver of the endotheliopathy of trauma
Active Project Grant Awarded Last action
- Award ID
- R01GM151631
- Recipient
-
University Of New Mexico UEI G389MFAYJNG9
- Awarding agency
-
National Institute of General Medical Sciences
National Institutes of Health, Department of Health and Human Services
- Obligated
- $1,640,585
Award facts
- Assistance listing
- 93.859 Biomedical Research and Research Training
- Completion date 48% complete
- Place of performance
- Albuquerque, NM 87131, USA
Award details come from USAspending.gov.
Description
- Abstract
- Severe hemorrhage is a life-threatening condition that often occurs in trauma. Hemorrhagic shock and the hypotension and tissue ischemia that results is associated with endothelial damage and dysfunction that is thought to contribute to associated complications and death. Recently, IT has been appreciated that a proteoglycan structure that lines blood vessels, known as the endothelial glycocalyx, is damaged during trauma and hemorrhage. This glycocalyx damage is thought to contribute to generalized blood vessel disfunction, multi-organ failure, and coagulopathy, together termed the endotheliopathy of trauma. Trauma patients with high plasma glycocalyx components DIE at higher rates, both due to uncontrolled hemorrhage, as well as an increase in multi-organ failure. Despite the potential importance of this mechanism, signaling events leading to acute endothelial glycocalyx shedding are largely undefined. We have previously found that metabolism of the citric acid cycle intermediate succinate drives the acute shedding of the glycocalyx. We also observed an increase in membrane lysophospholipids in a cell culture model of hypoxia-reoxygenation, as well as increases in the interaction between matrix metalloproteinases (mmps) and the glycocalyx constituent syndecan-1. These findings led US to hypothesize that the increased succinate metabolism during hemorrhage- resuscitation causes reactive oxygen species production and lipid oxidation, which leads to phospholipase A2- mediated generation of lysophospholipids and plasma membrane reorganization, allowing mmps to degrade the glycocalyx. We propose that a specialized protein-lipid domain forms in the plasma membrane consisting of lysophospholipids, mmps, and glycocalyx proteins, which we term a "sheddosome" domain. In two specific aims, we will 1.) determine how membrane reorganization mediates glycocalyx shedding through the formation of "sheddosome" domains in a general hypoxia-reoxygenation model. 2.) determine how lysophospholipid- mediated membrane reorganization leads to the endotheliopathy of trauma. This work will define a mechanism by which alterations in succinate metabolism drive changes in membrane structure, leading to glycocalyx damage, coagulopathy, and organ failure. This new knowledge of the acute vascular events in traumatic hemorrhage will inform future therapies to increase survival in these patients.
Transactions
| Action | Obligated | Date |
|---|---|---|
| Amendment | $327,875 | |
| Amendment | $0 | |
| Amendment | $0 | |
| Amendment | $314,257 | |
| Amendment | $314,257 | |
| Amendment | $314,257 | |
| Amendment | -$315,287 | |
| Amendment | -$315,287 | |
| Amendment | -$315,287 | |
| Amendment | $328,950 | |
| Amendment | $0 | |
| Amendment | $0 | |
| Amendment | $328,950 | |
| Amendment | $328,950 | |
| Original award | $328,950 |
Show all 15
Subawards
| Subrecipient | Amount | Awarded |
|---|---|---|
| The Administrators Of Tulane Educational Fund | $33,393 |
Quick answers
Who received award R01GM151631?
R01GM151631 was awarded to University Of New Mexico by National Institute of General Medical Sciences (National Institutes of Health) on July 10, 2024.
How much is award R01GM151631 worth?
$1,640,585 has been obligated on R01GM151631.
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