Peptide-Mediated Drug Delivery Across The Blood-Brain ...

Summary

The blood–brain barrier (BBB) is a selectively permeable interface formed by specialised endothelial cells, tight junctions and supporting pericytes and astrocytic endfeet. Its principal role is to maintain cerebral homeostasis by restricting entry of most therapeutics, especially macromolecules and hydrophilic agents. Peptide-mediated strategies exploit short amino-acid sequences to ferry drugs across this barrier via mechanisms such as receptor-mediated transcytosis, adsorptive-mediated uptake and direct membrane translocation. Shuttle peptides are designed to bind specific BBB receptors (for example transferrin or low-density lipoprotein receptor-related protein 1) and trigger endocytosis, while cell-penetrating peptides (CPPs) use electrostatic interactions to traverse endothelial membranes. Conjugation of these peptides to small molecules, proteins, nucleic acids or nanocarriers has enabled targeted delivery, enhanced brain accumulation and reduced peripheral toxicity. Advances include hierarchical assembly of phage-derived peptides into nanoligand carriers, optimisation of multivalent ligand avidity to favour tubular transcytosis and discovery of novel sequences through in vitro phage display. These developments offer promise for the treatment of neurological disorders such as Alzheimer’s disease, glioma and viral encephalitis by improving central nervous system bioavailability of otherwise impermeant therapeutics.

Research from Nature Portfolio

Recent studies have shown that hierarchical assembly of a brain-specific phage display peptide into NanoLigand Carriers enables precise targeting of cerebral endothelial receptors, notably the transferrin receptor and RAGE, triggering receptor-mediated transcytosis and delivery of siRNA cargo into neurons and glia. Intravenous administration of these constructs complexed with BACE1 siRNA achieved efficient enzyme down-regulation in the brain without observable inflammation, demonstrating both safety and functional gene silencing. This approach expands the repertoire of active targeting by combining multivalent peptide architecture with established RNA interference modalities, overcoming prior limitations in specificity and efficacy of nanoparticle-based brain delivery.

Research from all publishers

Novel BBB shuttle peptides have been identified via phage display using primary rat brain endothelium, yielding sequences such as GLHTSATNLYLH and VAARTGEIYVPW. These peptides exhibited permeability coefficients substantially above controls in in vitro BBB models and hold potential as non-covalent transporters for biopharmaceuticals. Mechanistic insights into receptor-mediated transcytosis were provided by studies employing synthetic multivalent ligands targeting LRP1; findings reveal that mid-level avidity optimises formation of syndapin-2-driven tubular carriers, facilitating rapid shuttling across endothelial cells while high avidity routes cargo to degradative pathways. In parallel, peptide–porphyrin conjugates designed for anti-HIV activity have been synthesised on solid support, coupling antiviral porphyrins to BBB shuttle peptides. Several conjugates demonstrate effective in vitro translocation across brain endothelium with low cytotoxicity and promising antiviral potency, illustrating the versatility of peptide-drug conjugates in delivering diverse payloads to the central nervous system.

Peptide-Mediated Drug Delivery Across The Blood-Brain Barrier publication trend

The graph below shows the total number of articles in peptide-mediated drug delivery across the blood-brain barrier across all publications each year (not limited to Nature Index journals).

Technical terms

Blood–brain barrier (BBB): A selective physical and biochemical barrier formed by brain endothelial cells, tight junctions, pericytes and astrocyte endfeet that regulates passage of substances from blood to brain.

Receptor-mediated transcytosis: The process by which ligands bound to specific endothelial receptors are internalised in vesicles and transported across cells to the opposite membrane.

Phage display: A screening technique in which libraries of peptide-expressing bacteriophages are used to identify sequences with high affinity for target receptors or surfaces.

Cell-penetrating peptides (CPPs): Short, often cationic peptides capable of crossing cellular membranes and delivering cargoes by direct translocation or endocytosis.

Peptide-drug conjugate (PDC): A bioactive therapeutic in which a peptide shuttle is covalently linked to a drug or imaging agent to facilitate targeted delivery across biological barriers.

References

1. Crossing the blood-brain-barrier with nanoligand drug carriers self-assembled from a phage display peptide. Nature Communications (2019).
2. On the shuttling across the blood-brain barrier via tubule formation: Mechanism and cargo avidity bias. Science Advances (2020).
3. Novel Blood–Brain Barrier Shuttle Peptides Discovered through the Phage Display Method. Molecules (2020).
4. Penetrating the Blood-Brain Barrier with New Peptide–Porphyrin Conjugates Having anti-HIV Activity. Bioconjugate Chemistry (2021).

About these summaries

This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.

Turn complex research questions into confident strategic decisions 

When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.

• Benchmark your performance against global peers using robust, methodologically sound analysis.

• Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.

• Gain tailored, decision-ready recommendations aligned to your strategic priorities.

Talk to us to learn more about our data dashboards and bespoke strategy reports.

Grow research skills, confidence and careers with training built for every stage of the research lifecycle.

Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:

• Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.

• Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.

• Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.

Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.