Evidence map›Paper›PMID 23298378›Full record

ReviewMolecular pharmaceutics2013

Diffusion of macromolecules in the brain: implications for drug delivery.

Daniel J Wolak, Robert G Thorne

Abstract readReview
In one paragraph

Review in Molecular pharmaceutics, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 153 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
153citing papers in PubMed, 1 pooled it
13.4field-weighted citation impact, top 1% 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

153 citing papers in PubMed, 1 synthesis or guideline pooled it, 295 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Article
  4. N-Methyl-D-Aspartate receptors controlbioRxiv : the preprint server for biology · 2026
    Article
  5. Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Review
  11. Nanoscopic Mapping of the Extracellular Space in Amyloid Plaque-rich Cortex.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026
    Article
  12. Review
  13. Review
  14. Article
  15. Review
  16. Article
  17. Article
  18. Intrathecal administration of Anti-Nogo-A antibody in macaque monkeys: Pharmacokinetics, tissue penetration and target interaction.Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics · 2025
    Article
  19. Article
  20. Review

93 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

2 authors at 1 institution in 1 country.

Daniel J WolakPharmaceutical Sciences Division, University of Wisconsin-Madison School of Pharmacy, Madison, Wisconsin 53705, United States.
Robert G Thorne
University of Wisconsin–Madison · US

Funding

Institutional Clinical and Translational Science AwardUL1TR000427 · NCATS · UNIVERSITY OF WISCONSIN-MADISON · PI DREZNER, MARC KENNETH · 2012 to 2016
$32.2M
Institutional Clinical and Translational Science AwardKL2TR000428 · NCATS · UNIVERSITY OF WISCONSIN-MADISON · PI DREZNER, MARC KENNETH · 2012 to 2016
$6.2M
Clinical Neuroengineering Training ProgramT32EB011434 · NIBIB · UNIVERSITY OF WISCONSIN-MADISON · PI MEYERAND, MARY E., PEARCE, ROBERT A · 2011 to 2015
$869k
NCATS NIH HHS KL2 TR000428NCATS NIH HHS UL1 TR000427NIBIB NIH HHS T32 EB011434PHS HHS T32 EBO11424
6 · The paper itself

Abstract

Therapeutics must diffuse through the brain extracellular space (ECS) in order to distribute within the central nervous system (CNS) compartment; this requirement holds both for drugs that are directly placed within the CNS (i.e., central input) and for drugs that cross the barriers separating blood and brain following systemic administration. The diffusion of any substance within the CNS may be affected by a number of properties associated with the brain microenvironment, e.g., the volume fraction, geometry, width, and local viscosity of the ECS, as well as interactions with cell surfaces, the extracellular matrix, and components of the interstitial fluid. Here, we discuss ECS properties important in governing the distribution of macromolecules (e.g., antibodies and other protein therapeutics), nanoparticles and viral vectors within the CNS. We also provide an introduction to some of the methods commonly applied to measure diffusion of molecules in the brain ECS, with a particular emphasis on those used for determining the diffusion properties of macromolecules. Finally, we discuss how quantitative diffusion measurements can be used to better understand and potentially even improve upon CNS drug delivery by modeling delivery within and across species, screening drugs and drug conjugates, evaluating methods for altering drug distribution, and appreciating important changes in drug distribution that may occur with CNS disease or injury.

Indexed as

Drug Delivery SystemsAnimalsBiological TransportBlood-Brain BarrierBrainCentral Nervous System DiseasesExtracellular SpaceHumansMacromolecular SubstancesModels, NeurologicalMacromolecular Substances

Identifiers

PMID23298378
PMCPMC3646902
OpenAlexW2040880670

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.