Abstract
Acute intracerebral hemorrhage (ICH) complicated by hyperglycemia is associated with aggravation of post-stroke inflammation, leading to exacerbation of brain edema and predicting poor neurological outcomes and higher mortality of patients. Osteopontin (OPN) is a neuroprotective glycoprotein, which is able to attenuate brain injury induced by hemorrhagic stroke. In the current study we investigated whether OPN will decrease the inflammatory post-ICH response as well as attenuate brain edema and neurological deficits in hyperglycemic rats. We employed a collagenase model of ICH on male Sprague-Dawley rats (n = 148) rats and 50% of Dextrose was injected intraperitoneally (i.p) 3 h after ICH (ICH + HG). Intranasal administration of recombinant OPN (rOPN) was performed 1 h after ICH. The development of brain injury was evaluated by brain water content (BWC) and neurological deficits, western blot and immunohistochemistry study. Small interfering ribonucleic acid (siRNA) for integrin-β1 receptor and a JAK2 agonist, Coumermycin A1 (C-A1), were used for detailed investigation of the molecular pathway. The administration of OPN (3 μg) significantly improved neurobehavior and increased expression of OPN and integrin-β1 receptor in the brain followed with decrease of neutrophil infiltration, JAK2, STAT1, TNF-a, IL-1b, MMP-9 and brain edema in the ICH + HG + OPN rats compared with ICH + HG rats. The effects of OPN were reversed by the intervention of intergrin-β1 siRNA and C-A1. In conclusion, rOPN attenuated ICH-induced brain inflammation in hyperglycemic rats, leading to attenuation of brain edema and improving neurological functions. Effects of rOPN were mediated at least partly by integrin-β1 induced inhibition of JAK2/STAT1 pathway.
Original language | English |
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Pages (from-to) | 160-169 |
Number of pages | 10 |
Journal | Neuropharmacology |
Volume | 138 |
DOIs | |
State | Published - Aug 2018 |
ASJC Scopus Subject Areas
- Pharmacology
- Cellular and Molecular Neuroscience
Keywords
- Brain edema
- Hyperglycemia
- ICH
- Inflammation
- Osteopontin
- STAT1 Transcription Factor/metabolism
- Integrin beta1/metabolism
- Male
- Brain Edema/drug therapy
- Glucose
- Random Allocation
- Neuroprotective Agents/pharmacology
- Osteopontin/pharmacology
- Rats, Sprague-Dawley
- Signal Transduction/drug effects
- Brain/drug effects
- Collagenases
- Animals
- Encephalitis/drug therapy
- Hyperglycemia/drug therapy
- Cerebral Hemorrhage/drug therapy
- Janus Kinase 2/metabolism
- Disease Models, Animal