Survivin is a transcriptional target of STAT3 critical to estradiol neuroprotection in global ischemia

Yoshihide Sehara, Kirsty Sawicka, Jee Yeon Hwang, Adrianna Latuszek-Barrantes, Anne M. Etgen, R. Suzanne Zukin

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Abstract

Transient global ischemia causes selective, delayed death of hippocampal CA1 pyramidal neurons in humans and animals. It is well established that estrogens ameliorate neuronal death in animal models of focal and global ischemia. However, the role of signal transducer and activator of transcription-3 (STAT3) and its target genes in estradiol neuroprotection in global ischemia remains unclear. Here we show that a single intracerebral injection of 17β estradiol to ovariectomized female rats immediately after ischemia rescues CA1 neurons destined to die. Ischemia promotes activation of STAT3 signaling, association of STAT3 with the promoters of target genes, and STAT3-dependent mRNA and protein expression of prosurvival proteins in the selectively vulnerable CA1. In animals subjected to ischemia, acute postischemic estradiol further enhances activation and nuclear translocation of STAT3 and STAT3-dependent transcription of target genes. Importantly, we show that STAT3 is critical to estradiol neuroprotection, as evidenced by the ability of STAT3 inhibitor peptide and STAT3 shRNA delivered directly into the CA1 of living animals to abolish neuroprotection. In addition, we identify survivin, a member of the inhibitor-of-apoptosis family of proteins and known gene target of STAT3, as essential to estradiol neuroprotection, as evidenced by the ability of shRNA to survivin to reverse neuroprotection. These findings indicate that ischemia and estradiol act synergistically to promote activation of STAT3 and STAT3-dependent transcription of survivin in insulted CA1 neurons and identify STAT3 and survivin as potentially important therapeutic targets in an in vivo model of global ischemia.

Original languageEnglish (US)
Pages (from-to)12364-12374
Number of pages11
JournalJournal of Neuroscience
Volume33
Issue number30
DOIs
StatePublished - 2013

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STAT3 Transcription Factor
Estradiol
Ischemia
Neuroprotection
Small Interfering RNA
Genes
Inhibitor of Apoptosis Proteins
Neurons
Pyramidal Cells

ASJC Scopus subject areas

  • Neuroscience(all)

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Survivin is a transcriptional target of STAT3 critical to estradiol neuroprotection in global ischemia. / Sehara, Yoshihide; Sawicka, Kirsty; Hwang, Jee Yeon; Latuszek-Barrantes, Adrianna; Etgen, Anne M.; Zukin, R. Suzanne.

In: Journal of Neuroscience, Vol. 33, No. 30, 2013, p. 12364-12374.

Research output: Contribution to journalArticle

Sehara, Yoshihide ; Sawicka, Kirsty ; Hwang, Jee Yeon ; Latuszek-Barrantes, Adrianna ; Etgen, Anne M. ; Zukin, R. Suzanne. / Survivin is a transcriptional target of STAT3 critical to estradiol neuroprotection in global ischemia. In: Journal of Neuroscience. 2013 ; Vol. 33, No. 30. pp. 12364-12374.
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AB - Transient global ischemia causes selective, delayed death of hippocampal CA1 pyramidal neurons in humans and animals. It is well established that estrogens ameliorate neuronal death in animal models of focal and global ischemia. However, the role of signal transducer and activator of transcription-3 (STAT3) and its target genes in estradiol neuroprotection in global ischemia remains unclear. Here we show that a single intracerebral injection of 17β estradiol to ovariectomized female rats immediately after ischemia rescues CA1 neurons destined to die. Ischemia promotes activation of STAT3 signaling, association of STAT3 with the promoters of target genes, and STAT3-dependent mRNA and protein expression of prosurvival proteins in the selectively vulnerable CA1. In animals subjected to ischemia, acute postischemic estradiol further enhances activation and nuclear translocation of STAT3 and STAT3-dependent transcription of target genes. Importantly, we show that STAT3 is critical to estradiol neuroprotection, as evidenced by the ability of STAT3 inhibitor peptide and STAT3 shRNA delivered directly into the CA1 of living animals to abolish neuroprotection. In addition, we identify survivin, a member of the inhibitor-of-apoptosis family of proteins and known gene target of STAT3, as essential to estradiol neuroprotection, as evidenced by the ability of shRNA to survivin to reverse neuroprotection. These findings indicate that ischemia and estradiol act synergistically to promote activation of STAT3 and STAT3-dependent transcription of survivin in insulted CA1 neurons and identify STAT3 and survivin as potentially important therapeutic targets in an in vivo model of global ischemia.

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