• L H Xu, X Y Jiao, and Z L Ji.
• Department of Plastic Surgery, Changhai Hospital, Second Military Medical University, Shanghai, P. R. China 200433.
• Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi. 2001 Mar 1;15(2):118-21.

ObjectiveTo investigate the skin regeneration using cultured human keratinocytes with collagen sponge transplanted into thickness wound of nude mice.MethodsHuman foreskin from foreskin ectomy procedures was detached with 0.5% Dispase II. Epidermis sheets were separated from dermis and digested with 0.05% Trypsin into single cell suspension. Keratinocytes were cultured and seeded into collagen sponge during logarithmic growth phase. After 3 days, the keratinocytes-collagen sponge were grafted on full thickness wound of nude mice, compared with simple collagen sponge without keratinocytes. The histological, immunohistochemical examination and electron microscopy were detected.ResultsAfter the epidermal substitute was grafted onto wound, the human keratinocytes were able to further proliferate and differentiate and develop into new epithelia. Compared with the control group, the wound healed earlier and contracted less, epithelia matured earlier, and the collagen fiber was less beneath epithelia.ConclusionKeratinocytes can grow on collagen sponge and migrate onto wound to develop into stratified epithelia and inhibit wound contract. The keratinocyte graft can be used to repair skin defect.

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