Bryostatin improves survival and reduces ischemic brain injury in aged rats after acute ischemic stroke

Zhenjun Tan, Ryan C. Turner, Rachel L. Leon, Xinlan Li, Jarin Hongpaisan, Wen Zheng, Aric F. Logsdon, Zachary J. Naser, Daniel L. Alkon, Charles L. Rosen, Jason D. Huber

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

BACKGROUND AND PURPOSE - Bryostatin, a potent protein kinase C (PKC) activator, has demonstrated therapeutic efficacy in preclinical models of associative memory, Alzheimer disease, global ischemia, and traumatic brain injury. In this study, we tested the hypothesis that administration of bryostatin provides a therapeutic benefit in reducing brain injury and improving stroke outcome using a clinically relevant model of cerebral ischemia with tissue plasminogen activator reperfusion in aged rats. METHODS - Acute cerebral ischemia was produced by reversible occlusion of the right middle cerebral artery (MCAO) in 18- to 20-month-old female Sprague-Dawley rats using an autologous blood clot with tissue plasminogen activator-mediated reperfusion. Bryostatin was administered at 6 hours post-MCAO, then at 3, 6, 9, 12, 15, and 18 days after MCAO. Functional assessment was conducted at 2, 7, 14, and 21 days after MCAO. Lesion volume and hemispheric swelling/atrophy were performed at 2, 7, and 21 days post-MCAO. Histological assessment of PKC isozymes was performed at 24 hours post-MCAO. RESULTS - Bryostatin-treated rats showed improved survival post-MCAO, especially during the first 4 days. Repeated administration of bryostatin post-MCAO resulted in reduced infarct volume, hemispheric swelling/atrophy, and improved neurological function at 21 days post-MCAO. Changes in αPKC expression and εPKC expression in neurons were noted in bryostatin-treated rats at 24 hours post-MCAO. CONCLUSIONS - Repeated bryostatin administration post-MCAO protected the brain from severe neurological injury post-MCAO. Bryostatin treatment improved survival rate, reduced lesion volume, salvaged tissue in infarcted hemisphere by reducing necrosis and peri-infarct astrogliosis, and improved functional outcome after MCAO.

Original languageEnglish (US)
Pages (from-to)3490-3497
Number of pages8
JournalStroke
Volume44
Issue number12
DOIs
StatePublished - Dec 2013
Externally publishedYes

Keywords

  • Aging
  • Blood-brain barrier
  • Infarction
  • Protein kinase C
  • Tissue plasminogen activator

ASJC Scopus subject areas

  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine
  • Advanced and Specialized Nursing

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