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Nanoparticles Exacerbate Both Ubiquitin and Heat Shock Protein Expressions in Spinal Cord Injury: Neuroprotective Effects of the Proteasome Inhibitor Carfilzomib and the Antioxidant Compound H-290/51
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Anaesthesiology and Intensive Care.
Univ Med & Pharm Cluj Napoca, Univ Hosp, Dept Clin Neurosci, Cluj Napoca, Romania.;RoNeuro Inst Neurol Res & Diagnost, Cluj Napoca 400364, Romania..
Univ Basque Country, Dept Neurosci, LaNCE, Bilbao, Spain.;Univ Autonoma Chile, Fac Hlth Sci, Santiago, Chile..
Karolinska Univ Hosp, Karolinska Inst, Dept Med, Div Cardiol, Stockholm, Sweden..
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2015 (English)In: Molecular Neurobiology, ISSN 0893-7648, E-ISSN 1559-1182, Vol. 52, no 2, 882-898 p.Article in journal (Refereed) Published
Abstract [en]

Increased levels of ubiquitin and heat shock protein (HSP) 72 kD are often seen in spinal cord injury (SCI). However, their roles in cell injury or survival are not well known. Thus, we have investigated the possible relationship between ubiquitin and HSP expressions in relation to cell injury in healthy animals, or following nanoparticle (NP) intoxication in SCI animals. A focal SCI was inflicted on the T10-11 segments over the right dorsal horn; animals were allowed to survive from 5 to 8 h after trauma. Separate groups of rats were exposed to SiO2, Ag, or Cu NPs for 7 days and subjected to SCI on the eighth day. A marked increase in ubiquitin or HSP immunoreactive cells occurred in the T9 to T12 segments 5 h after the injury, which further extended to the T4 and L5 after 8 h of survival. At this time, a marked increase in blood-spinal cord barrier (BSCB) permeability to Evans blue and radioiodine, accompanied by an intense edema formation, was observed. Changes were further exacerbated in NP-treated traumatized rats. The most marked expressions of ubiquitin and HSP in SCI were seen in rats treated with SiO2, followed by Ag, and Cu NPs. Treatment with H-290/51 (50 mg/kg p.o., 30 to 60 min after injury) or carfilzomib (1 mg/kg, i.v., 30 to 60 min after trauma) significantly reduced the ubiquitin or HSP expressions, as well as the BSCB breakdown, the edema formation, and the cell injury in the cord both 5 and 8 h after the injury, in normal animals. However, a double dose of H-290/51 (100 mg/kg) or carfilzomib (2 mg/kg) is needed to reduce cord pathology or ubiquitin and HSP expressions in traumatized animals treated with NPs. H-290/51 showed superior beneficial effects in reducing cord pathology in SCI than carfilzomib. These observations are the first to demonstrate that (i) NP-treated traumatized animals induce a widespread BSCB leakage, edema formation, and cord pathology as well as an overexpression of ubiquitin and HSP, (ii) high doses of antioxidant compounds or proteasome inhibitors are required for neuroprotection in the NP-exposed traumatized group, and (iii) ubiquitin and HSP expressions play a key role in neuronal injury in SCI, not reported earlier.

Place, publisher, year, edition, pages
2015. Vol. 52, no 2, 882-898 p.
Keyword [en]
Spinal cord injury, Nanoparticle, Ubiquitin, Heat shock protein, Blood-spinal cord barrier, Carfilzomib, H-290/51
National Category
Anesthesiology and Intensive Care Neurosciences
URN: urn:nbn:se:uu:diva-263421DOI: 10.1007/s12035-015-9297-9ISI: 000360687200008PubMedID: 26126513OAI: oai:DiVA.org:uu-263421DiVA: diva2:860681
AstraZenecaSwedish Research Council, 2710-HSSGöran Gustafsson Foundation for Research in Natural Sciences and MedicineSwedish Foundation for Strategic Research
Available from: 2015-10-13 Created: 2015-09-30 Last updated: 2015-10-13Bibliographically approved

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