Peptide-Functionalized Nanoparticles for Biomedical Applications

Peptide-functionalized nanoparticles represent a convergence of nanotechnology and molecular biology, in which short amino acid sequences are grafted onto nanoscale carriers to confer specific biological functions. By combining the tunable physicochemical properties of nanoparticles—such as size, shape and surface charge—with the targeting, cell‐penetrating or bioactive motifs of peptides, researchers have created versatile platforms for imaging, drug delivery, diagnostics and theranostics. Surface-bound peptides can direct nanoparticles to diseased tissues by recognising cell‐surface receptors, enhance cellular uptake via membrane translocation sequences, or introduce responsive linkers that release therapeutic payloads under defined biochemical conditions. These hybrid constructs address longstanding challenges in medicine, including poor drug solubility, off‐target toxicity and limited diagnostic sensitivity. Advances in peptide synthesis, conjugation chemistries and nanoparticle fabrication now enable systematic control over ligand density, orientation and stability, driving the design of bespoke nanosystems for oncology, infectious disease and regenerative medicine. This field continues to expand rapidly, driven by growing insights into peptide–biomaterial interactions, improved in vivo tracking techniques and the clinical imperative for precision therapies.

Research from Nature Portfolio

Recent studies have demonstrated how peptide‐coated gold nanoparticles can amplify the pro‐apoptotic potency of therapeutic peptides against cancer cells. By varying nanoparticle size and morphology, investigators showed that smaller spherical carriers enhance both cellular uptake and intrinsic apoptosis signalling more effectively than larger or rod‐shaped counterparts, allowing fine‐tuning of cytotoxicity while minimising haemolysis. In another advance, electrosprayed core–shell chitosan–alginate particles loaded with model proteins have revealed that nanoscale dimensions markedly improve cellular internalisation and sustained release profiles compared with microscale analogues. The nanoscale systems exhibited excellent biocompatibility, enhanced protein uptake by up to fourfold and more extended release over ten days, highlighting the influence of particle architecture on bioactivity and therapeutic delivery.

Peptide-Functionalized Nanoparticles for Biomedical Applications publication trend

The graph below shows the total number of articles in peptide-functionalized nanoparticles for biomedical applications across all publications each year (not limited to Nature Index journals).

Technical terms

Nanoparticle: A particle with dimensions between 1 and 100 nanometres, often possessing unique optical or magnetic properties.

Peptide-functionalization: The attachment of peptide sequences to a surface, conferring specific biological recognition or activity.

Theranostics: A combined approach to therapy and diagnostics, enabling simultaneous disease detection and treatment.

Cell-penetrating peptide (CPP): A short peptide capable of translocating across cell membranes to deliver attached cargos.

Targeting ligand: A molecule, such as a peptide, that binds selectively to specific receptors on target cells or tissues.

References

1. Tuning the anticancer activity of a novel pro-apoptotic peptide using gold nanoparticle platforms. Scientific Reports (2016).
2. Size-dependent bioactivity of electrosprayed core–shell chitosan-alginate particles for protein delivery. Scientific Reports (2022).
3. Peptide-nanoparticle conjugates as a theranostic platform. Coordination Chemistry Reviews (2024).
4. Spinorphin Molecules as Opportunities for Incorporation into Spinorphin@AuNPs Conjugate Systems for Potential Sustained Targeted Delivery to the Brain. Pharmaceuticals (2025).
5. Peptide-Enabled Targeted Delivery Systems for Therapeutic Applications. Frontiers in Bioengineering and Biotechnology (2021).