A platelet-derived hydrogel improves neovascularisation in full thickness wounds

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Wound Healing Research

Background:

• Platelets are crucial reservoirs of growth factors, cytokines, and chemokines essential for spontaneous wound repair.
• Slow wound vascularization is a significant contributor to delayed healing, incurring substantial economic costs.
• Expired platelet components represent a potential source for developing advanced wound healing therapies.

Purpose of the Study:

• To develop and evaluate a platelet- and fibrin-rich hydrogel derived from expired platelet components for wound repair.
• To investigate the hydrogel's effect on vascularization and inflammatory marker expression in a full-thickness wound model.
• To elucidate the role of sustained interleukin-6 (IL-6) in hydrogel-mediated enhancement of wound vascularization.

Main Methods:

• Generation of a platelet- and fibrin-rich hydrogel containing physiological concentrations of key growth factors (TGF-β1, PDGF-AB, PDGF-BB, IGF-1, FGF-2, EGF).
• Application of the hydrogel to full-thickness dorsal wounds in SKH-1 mice at various concentrations.
• Assessment of wound vascularization using immunohistochemical staining for CD31 (endothelial cell marker) and quantification of inflammatory markers (IL-6, KC).

Main Results:

• Hydrogel treatment significantly enhanced vascularization in the wound bed compared to untreated controls.
• Sustained high levels of interleukin-6 (IL-6) and KC were observed in hydrogel-treated wounds over an extended period.
• The developed hydrogel demonstrated improved dermal repair in a full-thickness wound mouse model.

Conclusions:

• The platelet- and fibrin-rich hydrogel effectively promotes wound healing and vascularization.
• Sustained IL-6 release is a potential mechanism driving the enhanced vascularization observed with the hydrogel.
• This biomaterial holds promise as a therapeutic option for wounds where vascularization is compromised.