What Does “Regenerative” Actually Mean in Wound Care?
By Nikolai Sopko, MD, PhD Chief Scientific Officer & Chief Operating Officer, PolarityBio
The word regenerative has become ordinary in wound care. It appears in scientific literature, conference presentations, marketing materials, and everyday clinical conversations. Despite its everyday use, the term isn’t widely understood.
As someone who has spent many years working at the intersection of medicine, science, and commercialization, I believe clarity around this term is important. When we use the word regenerative, we should be explicit about what we mean, and equally clear about what we do not.
Repair vs. Regeneration
Regeneration and repair can be conceptualized as a continuum often with a blurred transition between them. A simplistic distinction is that regenerated tissues have a structure and function identical to the original tissues they replaced whereas repaired tissues do not. Using skin as our example, a full-thickness injury such as a surgical incision, results in a scar whose visual, structural, and secondary functions are impaired. In mammals, only fetuses achieve scarless healing following a full-thickness skin wound. However, we will see that the context of the wound shapes our understanding of repair and regeneration.
In humans, skin has the third highest cell turnover with over 10 million new cells generated per day to account for the 40,000 skin cells we shed every minute, with the skin replacing itself entirely every 28-40 days. This is surpassed only by intestinal tissue and bone marrow with 100 million and 1 billion new cells each day, respectively. Thus, skin regenerates continuously to maintain our external barrier.
Returning to the context of wounds, in our lifetime we will experience thousands of superficial scratch wounds that thankfully heal without scars because their small size does not overwhelm skin’s innate regenerative capability. Once the degree of tissue loss exceeds skin’s regenerative capacity to meticulously reconstitute the lost cells and extracellular matrix, the repair process takes over which can generate replacement tissue more rapidly to close the defect. However, these repair tissues are less complex in structure and cellular content and subsequently lack all the function and physical attributes of the tissue they replaced. Skin scars are predominantly dense stiff type I collagen with an epithelial covering devoid of dermal appendages and vascular plexus.
As wound size increases, the magnitude of tissue loss overwhelms skin’s regenerative and repair capabilities, increasing the risk for infection and desiccation necessitating therapeutic intervention. Chronic wounds add an extra layer of complexity by being biologically bankrupt due to a multitude of host and local factors including persistent inflammation, disrupted cellular signaling, impaired vascularization, and altered extracellular matrix dynamics. All interfere with organized healing.
Many advanced wound therapies aim to facilitate tissue repair by providing a protective barrier, preventing desiccation or excessive exudate, and stimulating the wound bed and surrounding tissues to close the defect. In many cases this is successful, however in large, complex, and recalcitrant chronic wounds such supportive therapy is not adequate.
A Spectrum of Approaches All Labeled “Regenerative”
Many therapies are described as “regenerative,” but in reality they span a broad biological spectrum from supporting tissue repair to approaches capable of true tissue regeneration:
Acellular materials intended to support the wound environment without introducing living components
Tissue or extracellular matrix scaffolds that provide structure with limited cellular activity
Allogeneic cell-containing products that provide temporary signals, but cannot persist because they are eventually rejected by the immune system
Autologous cell-containing therapies that introduce living biological components capable of participating in tissue formation
Each approach has a role, but they differ meaningfully in how closely they replicate the body’s natural healing processes.
The Critical Puzzle Pieces in Tissue Regeneration
At the core of regeneration is a simple biological question: are living cells present, and can they meaningfully participate in tissue formation?
Acellular materials and tissue scaffolds may support healing by improving the wound environment or providing temporary structure. However, without living cellular components, these approaches rely entirely on the patient’s impaired wound biology to drive tissue formation.
True regeneration, by definition, requires cells capable of sensing, signaling, organizing, and rebuilding tissue. Cells are not passive ingredients; they are active participants in regeneration.
Equally important is whose cells are involved. Autologous skin cells, derived from the patient, are inherently matched to the individual’s immune system, biological signaling, and tissue architecture. This compatibility influences how effectively cells integrate, communicate, and contribute to durable tissue restoration.
In chronic wounds, where native regenerative processes have failed, the presence of viable, biologically relevant cells can be the difference between temporary repair and functional regeneration.
We’ve touched on both of these topics in recent posts that might be helpful to further understand the biology: Whose Cells Matters Cells or No Cells
Shifting the Focus to Functional Outcomes
The future of wound care will not be defined solely by whether a wound closes, but by how it heals.
Functional regeneration emphasizes:
Restoration of native tissue architecture
Coordinated interactions between cells and matrix
Healing that treats skin as an organ system, not simply a surface
This perspective reflects an evolution in both scientific understanding and clinical expectations. Durable outcomes demand more than simply coverage.
Why Precise Language Matters
Regenerative should be a biologically grounded concept, tied directly to how a therapy interacts with the body’s natural healing mechanisms.
As new biological approaches emerge, it’s important to understand the value and meaning of these terms. Precise language helps clinicians evaluate therapies accurately, understand their intended purpose and outcome, and ultimately supports better patient care.