Journal
NEUROSCIENCE LETTERS
Volume 573, Issue -, Pages 64-68Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neulet.2014.02.039
Keywords
bpV; PTEN; Spinal cord injury; Oligodendrocyte survival; Neuron atrophy
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Funding
- National Institutes of Health (NIH/NINDS) [R01 NS059622, NS050243, NS073636, F31NS 071863]
- Indiana Spinal Cord and Brain Injury Research Funds
- Mad Hulman George Endowment Funds
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Cervical spinal cord injury (SCI) damages axons and motor neurons responsible for ipsilateral forelimb function and causes demyelination and oligodendrocyte death. Inhibition of the phosphatase and tensin homologue, PTEN, promotes neural cell survival, neuroprotection and regeneration in vivo and in vitro. PTEN inhibition can also promote oligodendrocyte-mediated myelination of axons in vitro likely through Ala activation. We recently demonstrated that acute treatment with phosphatase PTEN inhibitor, bisperoxovanadium (bpV)-pic reduced tissue damage, neuron death, and promoted functional recovery after cervical hemi-contusion SCI. Evidence suggests bpV can promote myelin stability; however, bpV effects on myelination and oligodendrocytes in contusive SCI models are unclear. We hypothesized that bpV could increase myelin around the injury site through sparing or remyelination, and that bpV treatment may promote increased numbers of oligodendrocytes. Using histological and immunofluorescence labeling, we found that bpV treatment promoted significant spared white matter (30%; p < 0.01) and relative Luxol Fast Blue (LFB)+ myelin area rostral (Veh: 0.56 +/- 0.01 vs. bpV: 0.64 +/- 0.02; p < 0.05) and at the epicenter (Veh: 0.42 +/- 0.03 vs. bpV: 0.54 +/- 0.03; p < 0.05). VLF oligodendrocytes were also significantly greater with bpV therapy (109 +/- 5.3 vs. Veh: 77 +/- 2.7 mm(-2); p < 0.01). In addition, bpV increased mean motor neuron soma area versus vehicle-treatment (1.0 +/- 0.02 vs. Veh: 0.77 +/- 0.02) relative to Sham neuron size. This study provides key insight into additional cell and tissue effects that could contribute to bpV-mediated functional recovery observed after contusive cervical SCI. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
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