Cited by 217MicroRNA in disease regulationNeuroinflammation and Neurodegeneration MechanismsAcute Ischemic Stroke Management

An antagomir to microRNA Let7f promotes neuroprotection in an ischemic stroke model

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Selvamani, Amutha, Sathyan, Pratheesh, Miranda, Rajesh C., Sohrabji, Farida·2012·PLoS ONE

Abstract

We previously showed that middle-aged female rats sustain a larger infarct following experimental stroke as compared to younger female rats, and paradoxically, estrogen treatment to the older group is neurotoxic. Plasma and brain insulin-like growth factor-1 (IGF-1) levels decrease with age. However, IGF-1 infusion following stroke, prevents estrogen neurotoxicity in middle-aged female rats. IGF1 is neuroprotective and well tolerated, but also has potentially undesirable side effects. We hypothesized that microRNAs (miRNAs) that target the IGF-1 signaling family for translation repression could be alternatively suppressed to promote IGF-1-like neuroprotection. Here, we report that two conserved IGF pathway regulatory microRNAs, Let7f and miR1, can be inhibited to mimic and even extend the neuroprotection afforded by IGF-1. Anti-mir1 treatment, as late as 4 hours following ischemia, significantly reduced cortical infarct volume in adult female rats, while anti-Let7 robustly reduced both cortical and striatal infarcts, and preserved sensorimotor function and interhemispheric neural integration. No neuroprotection was observed in animals treated with a brain specific miRNA unrelated to IGF-1 (anti-miR124). Remarkably, anti-Let7f was only effective in intact females but not males or ovariectomized females indicating that the gonadal steroid environment critically modifies miRNA action. Let7f is preferentially expressed in microglia in the ischemic hemisphere and confirmed in ex vivo cultures of microglia obtained from the cortex. While IGF-1 was undetectable in microglia harvested from the non-ischemic hemisphere, IGF-1 was expressed by microglia obtained from the ischemic cortex and was further elevated by anti-Let7f treatment. Collectively these data support a novel miRNA-based therapeutic strategy for neuroprotection following stroke.

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  • miRNAs targeting several genes regulate microglia behavior and functions in diverse CNS pathologies.

    “Recently, miRNAs targeting several genes are involved in regulating microglia behavior and functions in diverse CNS pathologies including ischemic brain injuries (Selvamani et al., 2012; Zhao et al., 2013; Karthikeyan et al., 2018), multiple sclerosis (Ponomarev et al., 2011) and prion disease (Saba et al., 2012; Slota and Booth, 2019).”

    From miR-142-3p Regulates BDNF Expression in Activated Rodent Microglia Through Its Target CAMK2A (2020) · cites this paper as Selvamani et al., 2012

    The Results (no page available) show that anti-Let7f increased IGF-1 production in microglia harvested from ischemic cortex. The Discussion proposes that this may alter microglial activation, but does not establish broad regulation of microglial behavior and functions by miRNAs targeting several genes. This source supports an ischemic-injury example, not the broader claim by itself. (LLM, conf=0.85)

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  • IGF-1 promotes neuroprotection and neuroregeneration.

    “Some in vitro and in vivo studies have shown the role of IGF-1 in promoting neuroprotection and neuroregeneration (Li et al., 2010; Selvamani et al., 2012; Sohrabji and Williams, 2013; Bake et al., 2014).”

    From The impact of microglial activation on blood-brain barrier in brain diseases (2014) · cites this paper as Selvamani et al., 2012

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Authors
Selvamani, A., Sathyan, P., Miranda, R. C., & Sohrabji, F.
Affiliations
Texas A&M Health Science Center (US)
Corresponding author
Sohrabji, Farida
Venue
PLoS ONE
Published
2012-02-29
Volume
7
Issue
2
Pages
e32662
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2071432376
Cited by
217
References
79
Citations by year
2026: 1 · 2025: 4 · 2024: 6 · 2023: 7 · 2022: 11 · 2021: 12 · 2020: 16 · 2019: 19 · 2018: 18 · 2017: 26 · 2016: 20 · 2015: 23 · 2014: 27 · 2013: 22 · 2012: 4
FWCI
8.02
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • OakTrust (Texas A&M University Libraries) (submittedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging (R01AG027684, AG027684, AG028303, R01AG028303)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Epidemiology › Acute Ischemic Stroke Management
Keywords
ischemic stroke, neuroprotection, microRNA, let-7f, miR-1, insulin-like growth factor I, IGF-1 signaling, microglia, sex differences, infarct size, sensorimotor function, hemispheric integration, sex steroids
MeSH terms
Animals, Behavior, Animal, Disease Models, Animal, Female, Gene Expression Regulation, Insulin-Like Growth Factor I, Ischemia, Male, Sex Factors, Reperfusion Injury, Microglia, Neuroprotective Agents, Stroke, MicroRNAs, Rats

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