Hydrogel Engineering for Tissue Regeneration

Hydrogels are water-rich polymeric networks that closely mimic the extracellular matrix, offering a hospitable environment for cell attachment, proliferation and differentiation. Advances in hydrogel engineering have enabled precise control over biochemical cues, mechanical stiffness, degradability and three-dimensional architecture, thereby directing tissue formation and repair. Strategies include the incorporation of photolabile crosslinkers for spatiotemporal modulation, dynamic stiffening or softening to study mechanotransduction, and gradient or modular fabrication to screen cell–matrix interactions. These platforms have been applied to cartilage, bone, liver and neural repair, as well as organoid culture, demonstrating their versatility in recapitulating complex tissue microenvironments. Ongoing innovation seeks to integrate multi-modal stimuli-responsiveness—light, enzymes or traction forces—with scalable fabrication techniques to accelerate translation into clinical therapies.

Research from Nature Portfolio

Recent studies have reported hydrogels bearing three distinct photolabile crosslinkers that respond to low-energy visible light, enabling multicolour wavelength-selective degradation several centimetres deep in tissue-like constructs. When combined with polyethylene glycol macromers, these materials support high cell viability and permit patterned softening or complete breakdown for controlled cell recovery. In parallel, a light-mediated thiol–norbornene platform has yielded combinatorial hydrogel arrays with orthogonal biochemical gradients. This high-throughput system allows simultaneous screening of peptide concentrations on stem cell chondrogenesis, guiding the formulation of discrete scaffolds that reproduce predicted gene expression and matrix deposition profiles. Together, these works exemplify the integration of photochemistry and biomolecular engineering to achieve four-dimensional control over cell fate and tissue patterning.

Research from all publishers

A new class of coumarin-based photodegradable hydrogels has been developed for two-photon subtractive biofabrication at speeds up to 300 mm s⁻¹ under near-infrared irradiation. By embedding coumarin-functionalised polyethylene glycol linkers within thiolated hyaluronic acid matrices, rapid and efficient erosion is achieved at reduced laser power, facilitating the creation of microfluidic networks and hollow channels that direct three-dimensional cell migration. Separately, protein-based hydrogels have emerged as mechanically tunable scaffolds with inherent viscoelasticity derived from folding domains. These systems allow reversible modulation of stiffness and ligand presentation, supporting mechanobiology studies and sustained release of growth factors. Their bioactive interfaces and modular design render them promising for targeted tissue regeneration and drug-delivery applications.

Hydrogel Engineering for Tissue Regeneration publication trend

The graph below shows the total number of articles in hydrogel engineering for tissue regeneration across all publications each year (not limited to Nature Index journals).

Technical terms

Hydrogel: A three-dimensional, hydrophilic polymer network capable of retaining large volumes of water while maintaining structural integrity.

Crosslinker: A bifunctional or multifunctional molecule that connects polymer chains, determining network density and mechanical properties.

Photodegradable hydrogel: A hydrogel formulated with photolabile bonds that cleave upon light exposure, allowing precise spatial and temporal control of degradation.

Thiol–norbornene chemistry: A light-initiated click reaction between thiol and norbornene groups used to form or modify hydrogel networks under cytocompatible conditions.

Mechanotransduction: The process by which cells convert mechanical stimuli from their substrate into biochemical signals influencing behaviour and fate.

Biocompatibility: The ability of a material to perform with an appropriate host response, supporting cell viability and function without toxicity.

References

1. Tricolor visible wavelength-selective photodegradable hydrogel biomaterials. Nature Communications (2023).
2. Coumarin‐Based Photodegradable Hydrogels Enable Two‐Photon Subtractive Biofabrication at 300 mm s−1. Angewandte Chemie International Edition (2024).
3. Combinatorial hydrogels with biochemical gradients for screening 3D cellular microenvironments. Nature Communications (2018).
4. Protein Hydrogels: The Swiss Army Knife for Enhanced Mechanical and Bioactive Properties of Biomaterials. Nanomaterials (2021).