Version 1
: Received: 19 October 2016 / Approved: 20 October 2016 / Online: 20 October 2016 (08:46:38 CEST)
How to cite:
Connell, B. J.; Saleh, M. C.; Rajagopal, D.; Saleh, T. M. UPEI-400, a Conjugate of Lipoic Acid and Scopoletin, Mediates Neuroprotection in a Rat Model of Ischemia/Reperfusion. Preprints2016, 2016100083. https://doi.org/10.20944/preprints201610.0083.v1
Connell, B. J.; Saleh, M. C.; Rajagopal, D.; Saleh, T. M. UPEI-400, a Conjugate of Lipoic Acid and Scopoletin, Mediates Neuroprotection in a Rat Model of Ischemia/Reperfusion. Preprints 2016, 2016100083. https://doi.org/10.20944/preprints201610.0083.v1
Connell, B. J.; Saleh, M. C.; Rajagopal, D.; Saleh, T. M. UPEI-400, a Conjugate of Lipoic Acid and Scopoletin, Mediates Neuroprotection in a Rat Model of Ischemia/Reperfusion. Preprints2016, 2016100083. https://doi.org/10.20944/preprints201610.0083.v1
APA Style
Connell, B. J., Saleh, M. C., Rajagopal, D., & Saleh, T. M. (2016). UPEI-400, a Conjugate of Lipoic Acid and Scopoletin, Mediates Neuroprotection in a Rat Model of Ischemia/Reperfusion. Preprints. https://doi.org/10.20944/preprints201610.0083.v1
Chicago/Turabian Style
Connell, B. J., Desikan Rajagopal and Tarek M. Saleh. 2016 "UPEI-400, a Conjugate of Lipoic Acid and Scopoletin, Mediates Neuroprotection in a Rat Model of Ischemia/Reperfusion" Preprints. https://doi.org/10.20944/preprints201610.0083.v1
Abstract
Background: Previously, our laboratory has provided evidence that pre-administration of the antioxidant, lipoic acid covalently bonded to various naturally occurring antioxidants, enhanced neuroprotective capacity compared to the administration of lipoic acid on its own. The naturally occurring compound scopoletin, a coumarin derivative, has been shown in various in vitro studies to have both antioxidant and anti-inflammatory mechanism of actions. To date, the effect of scopoletin on neuronal cell death in an in vivo model of ischemia or ischemia-reperfusion has not been investigated. Therefore, the present investigation was designed to determine if scopoletin on its own, or a co-drug consisting of lipoic acid and scopoletin covalent bond, named UPEI-400, would be capable of demonstrating a similar neuroprotective efficacy. Methods: Using a rodent model of stroke in male rats (anesthetized with Inactin®; 100 mg/kg, iv), the middle cerebral artery was permanently occluded for 6 hours (pMCAO), or in separate animals, occluded for 30 min followed by 5.5 hrs of reperfusion (ischemia/reperfusion; I/R). Results: Pre-administration of either scopoletin or UPEI-400 significantly decreased infarct volume in the I/R model (p<0.05), but not in the pMCAO model of stroke. However, UPEI-400 was ~1000 times more potent as compared to scopoletin on its own. The optimal dose of UPEI-400 was then injected during the occlusion and at several time points during reperfusion and significant neuroprotection was observed for up to 150 mins following the start of reperfusion (p<0.05). Conclusion: The data suggest that synthetic combination of scopoletin with lipoic acid (UPEI-400) is a more effective neuroprotectant that either compound on their own. Also, since UPEI-400 was only effective in a model of I/R, it is possible that it may act to enhance neuronal antioxidant capacity and/or upregulate anti-inflammatory pathways to prevent the neuronal cell death.
Keywords
stroke; antioxidant; co-drug; animal model
Subject
Medicine and Pharmacology, Pathology and Pathobiology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
