Complex wound healing: 3D Bioprinting and Laser Therapy

The management of complex wounds remains a significant clinical challenge, especially in cases of tissue loss, deep burns, or chronic conditions. Conventional treatments require repeated interventions, highly specialised skills, and high costs, with results that are not always optimal. 
In this context, cutting-edge research is exploring integrated approaches capable of simplifying procedures and improving regenerative efficacy. A concrete example comes from a recent study combining in situ 3D bioprinting and NIR laser photobiomodulation, opening up new perspectives for wound care. 

An integrated approach to tissue regeneration

The study developed an innovative protocol based on four key steps:

1. 3D bioprinting directly in the wound (in situ) 
2. Use of bioinks biocompatible with human dermal fibroblasts 
3. NIR (near-infrared) laser irradiation to stimulate biological processes 
4. Histological and molecular analysis of the results

The goal is twofold:

• to rapidly restore the skin barrier
• to promote graft integration and accelerate healing. 

The central role of fibroblasts

In the healing process, fibroblasts play a crucial role throughout all phases—inflammation, proliferation, and remodelling—coordinating the cellular response and the production of extracellular matrix. 
In the model studied:

• the fibroblasts incorporated into the bioink promote re-epithelialisation
• contribute to neo-angiogenesis and tissue remodelling 
• can differentiate into myofibroblasts, essential for wound closure 

Photobiomodulation: a biological accelerator

The integration of NIR laser therapy slots into this context as a key modulator of the wound microenvironment.
According to the study:

• NIR radiation modulates the inflammatory response 
• stimulates tissue repair mechanisms 
• promotes integration of the bioprinted graft 

The effect is consistent with what is known about photobiomodulation, which acts at the cellular level to promote energy metabolism, proliferation, and the production of growth factors. 

Results: evidence of a synergistic effect

The comparison between the different experimental groups (bioprinting, laser, combination, and control) highlights a significant finding:

The bioprinting + laser combination was found to be the most effective