Evidence map›Paper›PMID 20420446›Full record

ArticleMolecular pharmaceutics2010

Trigeminal pathways deliver a low molecular weight drug from the nose to the brain and orofacial structures.

Neil J Johnson, Leah R Hanson, William H Frey

Abstract read
In one paragraph

Article in Molecular pharmaceutics, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 67 papers.

0numbers the graph read from it
0cells of the map it votes in
67citing papers in PubMed
2.7field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

67 citing papers in PubMed, 187 citations in OpenAlex.

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  10. Nanomedicine in the treatment of Alzheimer's disease: bypassing the blood-brain barrier with cutting-edge nanotechnology.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2025
    Review
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  18. Recent Aspects of Periodontitis and Alzheimer's Disease-A Narrative Review.International journal of molecular sciences · 2024
    Review
  19. Article
  20. Article

7 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 2 institutions in 1 country.

Neil J JohnsonHealthPartners Research Foundation, Alzheimer's Research Center at Regions Hospital, Saint Paul, Minnesota 55101, USA.
Leah R Hanson
William H Frey
HealthPartners · USRegions Hospital · US

Funding

MINNESOTA PAIN RESEARCH TRAINING PROGRAMT32DE007288 · NIDCR · UNIVERSITY OF MINNESOTA TWIN CITIES · PI HERZBERG, MARK C · 1996 to 2011
$8.8M
Intranasal Tat: A Mouse Model for NeuroAIDS and AgingR21MH072473 · NIMH · HEALTHPARTNERS RESEARCH FOUNDATION · PI FREY, WILLIAM H · 2004 to 2004
$209k
NIDCR NIH HHS T32 DE007288NIDCR NIH HHS T32 DE007288-13NIMH NIH HHS R21 MH072473
6 · The paper itself

Abstract

Intranasal delivery has been shown to noninvasively deliver drugs from the nose to the brain in minutes along the olfactory and trigeminal nerve pathways, bypassing the blood-brain barrier. However, no one has investigated whether nasally applied drugs target orofacial structures, despite high concentrations observed in the trigeminal nerve innervating these tissues. Following intranasal administration of lidocaine to rats, trigeminally innervated structures (teeth, temporomandibular joint (TMJ), and masseter muscle) were found to have up to 20-fold higher tissue concentrations of lidocaine than the brain and blood as measured by ELISA. This concentration difference could allow intranasally administered therapeutics to treat disorders of orofacial structures (i.e., teeth, TMJ, and masseter muscle) without causing unwanted side effects in the brain and the rest of the body. In this study, an intranasally administered infrared dye reached the brain within 10 minutes. Distribution of dye is consistent with dye entering the trigeminal nerve after intranasal administration through three regions with high drug concentrations in the nasal cavity: the middle concha, the maxillary sinus, and the choana. In humans the trigeminal nerve passes through the maxillary sinus to innervate the maxillary teeth. Delivering lidocaine intranasally may provide an effective anesthetic technique for a noninvasive maxillary nerve block. Intranasal delivery could be used to target vaccinations and treat disorders with fewer side effects such as tooth pain, TMJ disorder, trigeminal neuralgia, headache, and brain diseases.

Indexed as

Administration, IntranasalAnimalsBrainLidocaineMaleMasseter MuscleModels, AnatomicNasal MucosaRatsRats, Sprague-DawleyTemporomandibular JointToothTrigeminal NerveLidocaine

Identifiers

PMID20420446
PMCPMC2892271
OpenAlexW2003021017

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.