Title : Quantitative T(2) mapping-based longitudinal assessment of brain injury and therapeutic rescue in the rat following acute organophosphate intoxication - Almeida_2024_Neuropharmacol__109895 |
Author(s) : Almeida AJD , Hobson BA , Saito N , Bruun DA , Porter VA , Harvey DJ , Garbow JR , Chaudhari AJ , Lein PJ |
Ref : Neuropharmacology , :109895 , 2024 |
Abstract :
Acute intoxication with organophosphate (OP) cholinesterase inhibitors poses a significant public health risk. While currently approved medical countermeasures can improve survival rates, they often fail to prevent chronic neurological damage. Therefore, there is need to develop effective therapies and quantitative metrics for assessing OP-induced brain injury and its rescue by these therapies. In this study we used a rat model of acute intoxication with the OP, diisopropylfluorophosphate (DFP), to test the hypothesis that T(2) measures obtained from brain magnetic resonance imaging (MRI) scans provide quantitative metrics of brain injury and therapeutic efficacy. Adult male Sprague Dawley rats were imaged on a 7T MRI scanner at 3, 7 and 28 days post-exposure to DFP or vehicle (VEH) with or without treatment with the standard of care antiseizure drug, midazolam (MDZ); a novel antiseizure medication, allopregnanolone (ALLO); or combination therapy with MDZ and ALLO (DUO). Our results show that mean T(2) values in DFP-exposed animals were: (1) higher than VEH in all volumes of interest (VOIs) at day 3; (2) decreased with time; and (3) decreased in thalamus at day 28. Treatment with ALLO or DUO, but not MDZ alone, significantly decreased mean T(2) values relative to untreated DFP animals in the piriform cortex at day 3. On day 28, the DUO group showed the most favorable T(2) characteristics. This study supports the utility of T(2) mapping for longitudinally monitoring brain injury and highlights the therapeutic potential of ALLO as an adjunct therapy to mitigate chronic morbidity associated with acute OP intoxication. |
PubMedSearch : Almeida_2024_Neuropharmacol__109895 |
PubMedID: 38437913 |
Almeida AJD, Hobson BA, Saito N, Bruun DA, Porter VA, Harvey DJ, Garbow JR, Chaudhari AJ, Lein PJ (2024)
Quantitative T(2) mapping-based longitudinal assessment of brain injury and therapeutic rescue in the rat following acute organophosphate intoxication
Neuropharmacology
:109895
Almeida AJD, Hobson BA, Saito N, Bruun DA, Porter VA, Harvey DJ, Garbow JR, Chaudhari AJ, Lein PJ (2024)
Neuropharmacology
:109895