Cited by 146Advanced Drug Delivery SystemsBarrier Structure and Function StudiesAlzheimer's disease research and treatments

Distribution of insulin in trigeminal nerve and brain after intranasal administration

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Lochhead, Jeffrey J., Kellohen, Kathryn L., Ronaldson, Patrick T., Davis, Thomas P.·2019·Scientific Reports

Abstract

In the brain, insulin acts as a growth factor, regulates energy homeostasis, and is involved in learning and memory acquisition. Many central nervous system (CNS) diseases are characterized by deficits in insulin signaling. Pre-clinical studies have shown that intranasal insulin is neuroprotective in models of Alzheimer’s disease, Parkinson’s disease, and traumatic brain injury. Clinical trials have also shown that intranasal insulin elicits beneficial cognitive effects in patients with Alzheimer’s disease. It is known that insulin can be detected in the CNS within minutes following intranasal administration. Despite these advances, the anatomical pathways that insulin utilizes to reach the CNS and the cellular CNS targets after intranasal administration are not fully understood. Here, we intranasally administered fluorescently labeled insulin and imaged its localization within the brain and trigeminal nerves. Our data indicates that intranasal insulin can reach cellular CNS targets along extracellular components of the trigeminal nerve. Upon CNS entry, we found insulin significantly increased levels of an activated form of the insulin receptor. These findings suggest that the intranasal route of administration is able to effectively deliver insulin to CNS targets in a biologically active form.

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  • In rats, transport along trigeminal nerve branches to brainstem regions has been demonstrated.

    “In rats, transport along trigeminal nerve branches to brainstem regions has also been demonstrated.”

    From Intranasal insulin (2021) · cites this paper as [34]

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Authors
Lochhead, J. J., Kellohen, K. L., Ronaldson, P. T., & Davis, T. P.
Affiliations
University of Arizona (US)
Corresponding author
Lochhead, Jeffrey J.
Venue
Scientific Reports
Published
2019-02-22
Volume
9
Issue
1
Pages
2621-2621
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2917482585
Cited by
146
References
52
Citations by year
2026: 17 · 2025: 24 · 2024: 19 · 2023: 18 · 2022: 21 · 2021: 20 · 2020: 21 · 2019: 6
FWCI
7.26
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • American Heart Association (18CDA34110454)
  • U.S. Department of Health & Human Services | NIH | National Institute of Neurological Disorders and Stroke (042652)
Topics
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advanced Drug Delivery Systems
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
intranasal insulin, trigeminal nerve, insulin receptor activation, insulin receptor tyrosine kinase, neuroprotection, Alzheimer's disease, Parkinson's disease, traumatic brain injury, insulin signaling
MeSH terms
Administration, Intranasal, Animals, Brain, Female, Humans, Insulin, Receptor, Insulin, Tissue Distribution, Trigeminal Nerve, Fluorescein-5-isothiocyanate, Rats, Sprague-Dawley, Phosphotyrosine

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