Cell-Penetrating Peptide-Inspired Chitosan Improves Lung Delivery of Cancer Drug Octreotide | Research

The takeaway

Chitosan modified with amino acids mimicking cell-penetrating peptides enhanced octreotide absorption across lung epithelial cells in both lab and rat models.

AA-dependent
Amino acid type on chitosan determined the extent of octreotide absorption enhancement across lung epithelium

What the researchers found

Amino acid-modified chitosan enhanced octreotide absorption across lung epithelium in an amino acid type-dependent manner in cells and rats.

Why it matters

Inhaled peptide drugs could replace injections for conditions like neuroendocrine tumors, improving patient compliance and quality of life.

The numbers in context

Arginine-chitosan showed highest absorption enhancement among tested AA-CSs; tested in 3D Transwell models and Sprague Dawley rats.

How the study worked

Synthesis of amino acid-chitosan copolymers, 3D Transwell cell models, and Sprague Dawley rat lung delivery studies.

Who was studied

Sprague Dawley rats and lung epithelial cell models

What this study cannot tell us

Rat lung physiology differs from human. Long-term safety of modified chitosan in lungs needs assessment.

How to read the evidence

Preclinical drug delivery study with both in vitro and in vivo components — promising but needs human translation.

When this study was published

Published in 2025, advancing inhaled peptide delivery technology.

The bigger picture

CPP-inspired delivery materials could enable inhaled administration of many peptide drugs currently limited to injection.

Questions still open

Which amino acid modification provides the best safety-efficacy balance?
Could this approach work for inhaled GLP-1 or insulin delivery?

Common questions

Could octreotide be inhaled instead of injected?

This study shows modified chitosan polymers can help octreotide cross lung tissue — a step toward inhaled delivery replacing injections.

What are cell-penetrating peptides?

Short peptides that can cross cell membranes — their design principles were used to modify chitosan for better drug delivery through the lungs.

Read the original research

Biomimetic chitosan derivatives inspired by cell-penetrating peptides for enhanced octreotide absorption following lung delivery.

Carbohydrate polymers, 369, 124251

View on PubMed ↗Publisher’s paper ↗

Citation

Qin, Lu; Cui, Zhixiang; Zhang, Ziwei; Zhai, Qiyao; Wu, Yu; Guan, Jian; Xu, Enyu; Zhang, Xin; Mao, Shirui. (2025). Biomimetic chitosan derivatives inspired by cell-penetrating peptides for enhanced octreotide absorption following lung delivery.. Carbohydrate polymers, 369, 124251. https://doi.org/10.1016/j.carbpol.2025.124251