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Nanowired-Drug Delivery Enhances Neuroprotective Efficacy of Compounds and Reduces Spinal Cord Edema Formation and Improves Functional Outcome Following Spinal Cord Injury in the Rat

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Brain Edema XIV

Abstract

The possibility that drugs attached to nanowires enhance their therapeutic efficacy was examined in a rat model of spinal cord injury (SCI). Three Acure compounds AP-173, AP-713 and AP-364 were tagged with TiO2-based nanowires (50–60 nm) and applied over the traumatized cord either 5 or 60 min after SCI in rats produced by a longitudinal incision into the right dorsal horn of the T10-11 segments under equithesin anaesthesia. Normal compounds were used for comparison. After 5 h SCI, behavioral outcome, blood–spinal cord barrier (BSCB) permeability, edema formation and cell injury were examined. Topical application of nanowired compound AP-713 (10 µg in 20 µL) when applied either 5 or 60 min after injury markedly attenuated behavioral dysfunction at 2–3 h after SCI and reduces BSCB disruption, edema formation and cord pathology at 5 h compared to other compounds. Whereas normal compounds applied at 5 min after injury (but not after 60 min) had some significant but less beneficial effects compared to their nanowired combinations. On the other hand, nanowires alone did not influence spinal cord pathology or motor function after SCI. Taken together, our results indicate that the nanowired-drug-delivery enhances the neuroprotective efficacy of drugs in SCI and reduces functional outcome compared to normal compounds even applied at a later stage following trauma, not reported earlier.

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Acknowledgements

This investigation is partially supported by the Air Force Office of Scientific Research (London), Air Force Material Command, USAF, under grant number FA8655-05-1-3065. The U.S. Government is authorized to reproduce and distribute reprints for Government purpose notwithstanding any copyright notation thereon. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the Air Force Office of Scientific Research or the U.S. Government. We express sincere gratitude to several laboratories where a part of the work is done or some data is recorded and evaluated. Financial support from Acure Pharma (Sweden); Astra-Zeneca, Mölndal, Sweden, Alexander von Humboldt Foundation (Germany); The University Grants Commission, New Delhi, India, Department of Science and Technology, Govt. of India, New Delhi is gratefully acknowledged. The authors have no conflict of interest with any financial agencies mentioned above. Technical assistance of Inga Hörte, Kerstin Flink, Madeleine Jarild, Mari-Anne Carlsson, Margaretta Butler of Uppsala University are highly appreciated.

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Correspondence to Hari Shanker Sharma .

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Sharma, H.S. et al. (2010). Nanowired-Drug Delivery Enhances Neuroprotective Efficacy of Compounds and Reduces Spinal Cord Edema Formation and Improves Functional Outcome Following Spinal Cord Injury in the Rat. In: Czernicki, Z., Baethmann, A., Ito, U., Katayama, Y., Kuroiwa, T., Mendelow, D. (eds) Brain Edema XIV. Acta Neurochirurgica Supplementum, vol 106. Springer, Vienna. https://doi.org/10.1007/978-3-211-98811-4_63

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  • DOI: https://doi.org/10.1007/978-3-211-98811-4_63

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