Efficacy study of pore skin artificial dermis in animal wound model according to US-FDA : guidance for industry chronic cutaneous ulcer and burn wounds-developing products for treatment
Abstract:
This preclinical study investigated wound healing efficacy of Artificial dermis (Pore Skin®) extracted from human dermis, that aim to use clinically in full-thickness excisional wounds. Animal model selected in this study was 6-mount-old female Guinea pig (n = 16) according to the guidance for industry; chronic cutaneous ulcer and burn wound - developing products for treatment of US Food and Drug Administration (US-FDA). Two rectangular 1.5x1.5 cm. full-thickness skin defect with excision carried down to the panniculus carnosus were created on both side of ventral midline of a rodent. The treatments were divided into two groups: 1) wound treated with 1% povidone iodine (control wound) and 2) wound treated with Pore Skin®- artificial dermis. Three weeks after implantation, end point efficacy of wound healing including inhibition of wound contraction and formation of new collagen in the porous cavity of scaffold were evaluated by gross pathology, wound size measured and histological stained by H&E staining and Masson Trichrome staining. The results demonstrated that extracellular matrix of new collagen was regenerated in wounds treated with Pore Skin® which was found in all eight guinea pigs (100%) in which Pore Skin® remained attaching to the wound surface. Unfortunately, another 8 treated rats lost the Pore Skin® before the evaluation time due to the difficulty of animals wound care after implantation. Then, wound healing of latter lost Pore Skin® rodents were similar to the healing of the control wounds which showed contracted wounds and lack of new collagen formation. Contraction study confirmed that the wounds treated with Pore Skin® contracted 41.51% less than the control wounds (P-value < 0.0001). This finding suggested that Pore Skin® would be beneficial for promoting wound healing with improved quality and could be satisfactory when used for the treatment of full-thickness open wound in further clinical study