AI Article Synopsis

  • Exercise preconditioning (EP) helps prevent stroke by protecting neurons that contain heat shock protein (HSP) 72 in the brain during ischemic injury.
  • In a study with 240 rats, significant increases in HSP72-containing neurons after exercise were linked to reduced brain damage and improved motor function following induced ischemia.
  • The results indicate that enhancing the survival of HSP72 neurons through exercise can lead to better outcomes in brain injury, as shown by the correlation between neuron preservation and reduced ischemic damage.

Article Abstract

Exercise preconditioning (EP) is a useful and important procedure for the prevention of stroke. We aimed to ascertain whether EP protects against ischemic brain injury by preserving heat shock protein (HSP) 72-containing neurons in ischemic brain tissues. Adult male Sprague-Dawley rats (n=240) were used to assess the contribution of HSP72-containing neurons to the neuroprotective effects of EP on ischemic brain injury caused by transient middle cerebral artery occlusion. Significant (P<0.05) increases in the percentages of both old HSP72-containing neurons (NeuN+HSP72 double positive cells) (18~20% vs. 40~50%) and newly formed HSP72-containing neurons (BrdU+NeuN+HSP72 triple positive cells); (2~3% vs. 16~20%) after 3 weeks of exercise coincided with significant (P<0.05) reductions in brain ischemia volume (250 mm vs. 100 mm), brain edema (78% vs. 74% brain water content), blood-brain barrier disruption (1.5 μg/g vs. 0.7 μg/g tissue Evans Blue dye extravasation) and neurological motor deficits (neurological severity scores of 12 vs. 6 and maximal angles of 60° vs. 20°) in brain ischemia rats. Reductions in the percentages of both old (from 40~50% to 10~12%) and newly formed (from 18~20% to 5~7%) HSP72-containing neurons by gene silencing with an intracerebral injection of pSUPER small interfering RNA showed a significant (P<0.05) reversal in the neuroprotective outcomes. Our data provide an inverse correlation between the EP-mediated increases in both old and newly formed HSP72-containing neurons and the extent of cerebral ischemic injury. The percentages of both old and newly formed HSP72-containing neurons are inversely correlated with the outcomes of ischemic brain injury. Additionally, preischemic treadmill exercise improves the outcomes of ischemic brain injury by preserving both the old and newly formed HSP72-containing neurons in rats.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566739PMC
http://dx.doi.org/10.7150/ijms.32962DOI Listing

Publication Analysis

Top Keywords

ischemic brain
12
exercise preconditioning
8
injury preserving
8
hsp72-containing neurons
8
brain injury
8
preconditioning attenuates
4
attenuates neurological
4
neurological injury
4
preserving newly
4
newly formed
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!