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. 2007 Oct;66(10):932-43.
doi: 10.1097/nen.0b013e3181567d59.

Annexin A1 reduces inflammatory reaction and tissue damage through inhibition of phospholipase A2 activation in adult rats following spinal cord injury

Nai-Kui Liu  1 , Yi Ping Zhang, Shu Han, Jiong Pei, Lisa Y Xu, Pei-Hua Lu, Christopher B Shields, Xiao-Ming Xu
Affiliations

Annexin A1 reduces inflammatory reaction and tissue damage through inhibition of phospholipase A2 activation in adult rats following spinal cord injury

Nai-Kui Liu et al. J Neuropathol Exp Neurol. 2007 Oct.

Abstract

Annexin A1 (ANXA1) has been suggested to be a mediator of the anti-inflammatory actions of glucocorticoids and more recently an endogenous neuroprotective agent. In the present study, we investigated the anti-inflammatory and neuroprotective effects of ANXA1 in a model of contusive spinal cord injury (SCI). Here we report that injections of ANXA1 (Ac 2-26) into the acutely injured spinal cord at 2 concentrations (5 and 20 microg) inhibited SCI-induced increases in phospholipase A2 and myeloperoxidase activities. In addition, ANXA1 administration reduced the expression of interleukin-1beta and activated caspase-3 at 24 hours, and glial fibrillary acidic protein at 4 weeks postinjury. Furthermore, ANXA1 administration significantly reversed phospholipase A2-induced spinal cord neuronal death in vitro and reduced tissue damage and increased white matter sparing in vivo, compared to the vehicle-treated controls. Fluorogold retrograde tracing showed that ANXA1 administration protected axons of long descending pathways at 6 weeks post-SCI. ANXA1 administration also significantly increased the number of animals that responded to transcranial magnetic motor-evoked potentials. However, no measurable behavioral improvement was found after these treatments. These results, particularly the improvements obtained in tissue sparing and electrophysiologic measures, suggest a neuroprotective effect of ANXA1.

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