Heterogenous transplantation of skin was studied on two strains of mice BALB/C and Swiss.The subjects were divided into various groups :normal group, cyclophosphamid (CP) inhibited group, cyclosporin A (CPA) inhibited group, and the group processed with DY1. The onset of reject phenomenon of the graft and the completed reject of the graft in the groups of mice using CP, CPA and DY1 were more delayed in comparing with the controlled subjects. The cell numbers decreased and the percentage of transformed cells also decreased in all groups using CP, CPA and DY1
Skin Transplantation ; Mice ; Cells

The study was implemented on 39 patients who were grafted by medium thick and thin skin pieces at National burn Institute from 2/1997 to 12/1997 and to be compared with method of vaselin compress using on smallest study’s surface of 1% BSA and bigest of 6%. The result is summarized in the below: secondary haemoragy after operation (+); secondary haemohara after bandage: 7-inflammation and fluid secretion: 2-purulent infection: 0-pain time on the spot: 2 - pain intensity (+) the average recovering day: 8.3.
Skin Transplantation ; Ointments

Animals ; Hair ; transplantation ; Humans ; Skin Transplantation ; Vibrissae

Chronic cavities of the dorsum of the foot often have bare bone and are unsuitable for free skin grafting. Local Flaps are often impossible because of surrounding scar tissue and dead space. A simple method is presented; it consists of the excision of the lesion, filling the cavity by a two staged random-pattern de-epithelialised turn over flap, and skin graft.
Cicatrix ; Foot ; Methods ; Skin ; Skin Transplantation ; Transplants

Acral lentiginous melanoma (ALM) is the rarest of the four subtypes of cutaneous melanoma.1 It accounts for only 2-8% of melanomas in caucasians.2 Only 52 cases of ALM have been recorded in the Philippine Dermatological Society Health Information System from 2011 to 2016.3 Histopathologic demonstration of cytologic atypia, presence of mitoses in the deep dermis, pagetoid spread of epidermal melanocytes and lack of maturation of nests with descent into the dermis are features diagnostic of melanoma.2 4 ALM is primarily managed through wide surgical excision. The most common sites for ALM are the soles, palms, and subungual areas.2 The rarity of ALM, the inconspicuousness of the locations of some lesions, and the difficulty in discerning ALM from benign lesions and traumatic changes usually delay the diagnosis and contribute to the poor prognosis of the disease.4 5 6 A 53-year-old male consulted us for an enlarging pigmented plaque on the sole of his left foot. The lesion started as a junctional nevus, which the patient had since birth. The nevus, originally measuring approximately 0.5 x 0.5 cm, started to increase in size one year prior to the consultation. One month before consultation, the patient noted a black nodule on the center of the lesion. A week before consultation, the lesion bled and became painful after manipulation by the patient. Dermatologic examination of the plantar aspect of the left foot revealed a 1.7 x 1.6 cm, dark brown-black, asymmetric plaque with cobblestone-like surface and a black indurated nodule on the center (Figure 1A). Dermoscopic findings of bluish white veil and irregular pigmentation with variable hypopigmented blotches are suggestive of acral melanoma (Figure 1B). Skin punch biopsy and immunohistochemical stains for S100, Melan A, HMB-45, and KI-67 confirmed the diagnosis of ALM (Figure 2, 3). We did a wide local excision of the lesion with a 2-cm margin from the tumor edge, with depth up to the suprafascial level (Figure 4A). The excisional defect was repaired with a split-thickness skin graft taken from the patient’s skin on the right thigh (Figure 6), which provided excellent aesthetic result. We also did a sentinel lymph node biopsy on the left inguinal area (Figure 5A,B). Frozen section biopsy showed solid nests of atypical melanocytes invading the surrounding fibrous stroma. Individual cells exhibit round to oval, deeply basophilic nuclei and abundant, clear to eosinophilic cytoplasm. Some areas showed prominent melanin pigmentation. Sections along lines of resection, lymphovascular channels, nerves and adipose tissues of the excised mass (Figure 4 B,C) and lymph nodes from sentinel biopsy were all devoid of malignant tumor cells. Histopathologic findings from frozen section biopsy and permanent section biopsy were both consistent with malignant melanoma with 3 mm Breslow thickness. The patient’s postoperative course, including wound healing, was uneventful (Figure 7). During the patient’s 12-month follow up period, we did not observe any signs of local or distant recurrence of the tumor.
Melanoma, Cutaneous Malignant ; Skin Transplantation

Acral lentiginous melanoma (ALM) is the rarest of the four subtypes of cutaneous melanoma.1 It accounts for only 2-8% of melanomas in caucasians.2 Only 52 cases of ALM have been recorded in the Philippine Dermatological Society Health Information System from 2011 to 2016.3 Histopathologic demonstration of cytologic atypia, presence of mitoses in the deep dermis, pagetoid spread of epidermal melanocytes and lack of maturation of nests with descent into the dermis are features diagnostic of melanoma.2 4 ALM is primarily managed through wide surgical excision. The most common sites for ALM are the soles, palms, and subungual areas.2 The rarity of ALM, the inconspicuousness of the locations of some lesions, and the difficulty in discerning ALM from benign lesions and traumatic changes usually delay the diagnosis and contribute to the poor prognosis of the disease.4 5 6 A 53-year-old male consulted us for an enlarging pigmented plaque on the sole of his left foot. The lesion started as a junctional nevus, which the patient had since birth. The nevus, originally measuring approximately 0.5 x 0.5 cm, started to increase in size one year prior to the consultation. One month before consultation, the patient noted a black nodule on the center of the lesion. A week before consultation, the lesion bled and became painful after manipulation by the patient. Dermatologic examination of the plantar aspect of the left foot revealed a 1.7 x 1.6 cm, dark brown-black, asymmetric plaque with cobblestone-like surface and a black indurated nodule on the center (Figure 1A). Dermoscopic findings of bluish white veil and irregular pigmentation with variable hypopigmented blotches are suggestive of acral melanoma (Figure 1B). Skin punch biopsy and immunohistochemical stains for S100, Melan A, HMB-45, and KI-67 confirmed the diagnosis of ALM (Figure 2, 3). We did a wide local excision of the lesion with a 2-cm margin from the tumor edge, with depth up to the suprafascial level (Figure 4A). The excisional defect was repaired with a split-thickness skin graft taken from the patient’s skin on the right thigh (Figure 6), which provided excellent aesthetic result. We also did a sentinel lymph node biopsy on the left inguinal area (Figure 5A,B). Frozen section biopsy showed solid nests of atypical melanocytes invading the surrounding fibrous stroma. Individual cells exhibit round to oval, deeply basophilic nuclei and abundant, clear to eosinophilic cytoplasm. Some areas showed prominent melanin pigmentation. Sections along lines of resection, lymphovascular channels, nerves and adipose tissues of the excised mass (Figure 4 B,C) and lymph nodes from sentinel biopsy were all devoid of malignant tumor cells. Histopathologic findings from frozen section biopsy and permanent section biopsy were both consistent with malignant melanoma with 3 mm Breslow thickness. The patient’s postoperative course, including wound healing, was uneventful (Figure 7). During the patient’s 12-month follow up period, we did not observe any signs of local or distant recurrence of the tumor.
Melanoma, Cutaneous Malignant ; Skin Transplantation

OBJECTIVETo prepare a porcine acellular dermal matrix (PADM), and to optimize the interpore distance between PADM and co-grafted split-thickness autologous skin.

METHODSPorcine skin was treated with trypsin/Triton X-100 to prepare an acellular dermal matrix. Micropores were produced on the PADM with a laser punch. The distance between micropores varied as 0.8 mm, 1.0 mm, 1.2 mm and 1.5 mm. Full-thickness defect wounds were created on the back of 144 SD rats. The rats were randomly divided into 6 groups as follows, with 24 rats in each group. Micropore groups I -IV: the wounds were grafted with PADM with micropores in four different intervals respectively, and covered with split-thickness autologous skin graft. Mesh group: the wounds were grafted with meshed PADM and split-thickness autograft.

CONTROL GROUPwith simple split-thickness autografting. The gross observation of wound healing and histological observation were performed at 2, 4, 6 weeks after surgery. The wound healing rate and contraction rate were calculated.

RESULTSTwo and four weeks after surgery, the wound healing rate in micropore groups I and II was lower than that in control group (P < 0.05), but no obvious difference was between micropore groups I , II and mesh group (P > 0.05) until 6 weeks after grafting( P <0.05). The wound contraction rate in micropore groups I and II ([(16.0 +/- 2.6)%, (15.1 +/- 2.4)%] was remarkably lower than that in control group 4 and 6 weeks after grafting (P < 0.05), and it was significantly lower than that in mesh group [(19.3 +/- 2.4)%] 6 weeks after surgery (P <0.05). Histological examination showed good epithelization, regularly arranged collagenous fibers, and integral structure of basement membrane.

CONCLUSIONLaser micropore PADM (0.8 mm or 1.0 mm in distance) grafting in combination with split-thickness autografting can improve the quality of wound healing. PADM with laser micropores in 1.0 mm distance is the best choice among them.

Animals ; Dermis ; transplantation ; Lasers ; Rats ; Rats, Sprague-Dawley ; Skin Transplantation ; methods ; Skin, Artificial ; Swine ; Transplantation, Heterologous

OBJECTIVETo compare the composite grafts of acellular dermal matrix (ADM) from different sources with autoskin.

METHODSSix local white mini pigs were employed for the experiment. The pigs were randomly divided into four groups according to different skin grafts, i.e. A (human ADM with razor thin autoskin), B (porcine ADM with razor thin autoskin), C (razor thin autoskin only), and D (split thickness autoskin) as control. The survival rate, the contraction degree of the grafts, and the histological changes in grafting area were observed at 2, 4, 8, 12 and 24 hours after the operation.

RESULTSThe grafted area in both A and B groups appeared smooth and elastic with satisfactory graft survival. The in growth of the host reparative cells such as fibroblast and vascular endothelium could be induced by composite grafts of different ADMs with skin grafting. The contraction areas in A and B groups seemed bigger than those in C and D groups. The tissue structure of grafting areas was similar to that of split thickness skin grafting area at 24 post-operation weeks.

CONCLUSIONCombination of the homogenous and heterogeneous ADMs with autografts exhibited similar biological function during the observation period (24 weeks after operation). Xenogenous ADMs might have broader clinical applications.

Animals ; Dermis ; transplantation ; Graft Survival ; Humans ; Skin Transplantation ; methods ; Swine ; Transplantation, Autologous ; Transplantation, Homologous

The basic and clinical research in wound healing have made great progress in China in the past 50 years. The method of "intermingle skin transplantation" which was first advocated by surgeons of Ruijin Hospital in 1966 greatly reduced the amount of autologous donor skin, thus making the coverage of an extensive burn wound possible. This method is also known as "Chinese therapy". In 1986, doctors of Jishuitan Hospital reported successful coverage of an extensive burn wound with microautografts and allogeneic skin. The basic research of wound healing has been carried out since 1992, a series of studies showed the characteristics of biological behaviours of cells in concern, extracellular matrix and growth factor, the mechanism underlying progressive injury in deep second burn wound, the effect of "skin island" and the local immune tolerance induced by it (which are the key factors of intermingle transplantation). The induction of local immune tolerance has now become the research hot subject of skin transplantation immunology. Stem cell research in the field of wound healing has been extensively carried out. The theory of "dermal template defection" has been proposed as one of the mechanisms of scar formation. On the other hand, great progress has been achieved in the treatment of burns on the basis of clinical researches. Doctors of PLA 304 hospital found that excision of eschar on patients with extensive deep burn injury at early shock stage greatly decreased the occurrence of complications and mortality. Doctors of Ruijin Hospital reported that healing of deep second burn wound could be improved by tangential excision of burn eschar within 24 hours after burn injury. Doctors of Xiangya Hospital reported patients suffering from deep burns of the hands got satisfied functional restoration when treated with tangential excision of eschar while degraded dermal tissue could be retained with transplantation of autoskin grafts.
Burns ; surgery ; Humans ; Skin Transplantation ; Transplantation, Autologous ; Transplants ; Wound Healing

Since microskin grafting was used in 1985, 23 years have passed. Many patients with extensive third degree burns were cured by the technique. Some progresses and further improvements are discussed. (1) Several kinds of apparatus were devised to cut skin into micrografts with good results. (2) The orientation of each skin granule and even dispersion of micrografts are very important. Some methods to spread micrografts on wound were compared with one another, the technique of flotation in saline and transferring them on silk texture is still the best way. (3) Many outside materials other than silk can be selected, among them the homograft is commonly used, but it has some shortcomings. (4) The technique should be further improved. Stem cell transplantation may be expected as a new way to help heal extensive wounds.
Burns ; surgery ; Humans ; Skin Transplantation ; methods ; trends