Abstract
Stroke causes devastating and irreversible losses of neurological function with subsequent slow and incomplete recovery of lost brain functions, because of the brain’s limited capacity for brain plasticity. Growth arrest and DNA-damage-inducible protein 45 beta (Gadd45b) has recently been demonstrated as a candidate plasticity-related gene, making it an excellent candidate molecule that has therapeutic potential. Here, we examine whether in vivo blockage of Gadd45b affects axonal plasticity and subsequent functional recovery after focal brain infarction. Adult male Sprague-Dawley rats were subjected to cerebral ischemia by middle cerebral artery occlusion (MCAO). We adopted RNA interference (RNAi) mediated by a lentiviral vector (LV) as a means of suppressing the expression of Gadd45b. Functional recovery was assessed with a battery of tests that measured skilled forelimb reaching and forelimb balance controlling. Axonal reorganization at the level of the red nucleus was revealed by anatomical studies. Axonal regeneration was measured by elevated expression of growth-associated protein 43 (GAP-43). The levels of brain-derived neurotrophic factor (BDNF), cyclic AMP (cAMP), protein kinase A (PKA), and Rho-kinase (ROCK) were determined. Gadd45b-RNAi significantly inhibited axonal plasticity (axonal regeneration and axonal reorganization) after MCAO. This inhibition was paralleled by worse functional recovery performance on several behavioral measures. Gadd45b-RNAi also significantly decreased the expression levels of both BDNF and cAMP/PKA/phosphorylated cAMP response element-binding protein (pCREB) pathway and promoted ROCK expression. We conclude that Gadd45b stimulates recovery after stroke by enhancing axonal plasticity required for brain repair. Pharmacological targeting of Gadd45b provides new opportunities for stroke treatment.
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Abbreviations
- Gadd45b:
-
Growth arrest and DNA-damage-inducible protein 45 beta
- MCAO:
-
Middle cerebral artery occlusion
- RNAi:
-
RNA interference
- LV:
-
Lentiviral vectors
- CCA:
-
Common carotid artery
- ECA:
-
External carotid artery
- ICA:
-
Internal carotid artery
- GFP:
-
Green fluorescent protein
- TTC:
-
Triphenyltetrazolium chloride
- BDNF:
-
Brain-derived neurotrophic factor
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This work was supported by the Natural Science Foundation of China (Grant No. 81271306) and the Medical Science Research Project of Chongqing Municipal Health Bureau (2012-1-037).
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Liu, B., Li, Ll., Tan, Xd. et al. Gadd45b Mediates Axonal Plasticity and Subsequent Functional Recovery After Experimental Stroke in Rats. Mol Neurobiol 52, 1245–1256 (2015). https://doi.org/10.1007/s12035-014-8909-0
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DOI: https://doi.org/10.1007/s12035-014-8909-0