Auricular reconstruction for concha-type microtia / 中华整形外科杂志

<p><b>OBJECTIVE</b>To investigate the method of auricular reconstruction for concha-type microtia.</p><p><b>METHODS</b>Two-staged auricular reconstruction was applied in 13 cases (14 ears) with concha-type microtia. The cartilage auricular framework was fabricated and implanted in the first stage, followed by ear elevation and cranio-auricle angle formation at the second stage.</p><p><b>RESULTS</b>The patients were followed up for 2 months to 2 years with satisfactory aesthetic result. The reconstructed ears had a good appearance and position, and were symmetric to the healthy ears.</p><p><b>CONCLUSIONS</b>The two-staged auricular reconstruction with autologous cartilage framework is ideal for concha-type microtia.</p>

Construction of recombinant lentiviral vector of Tie2-RNAi and its influence on malignant melanoma cells in vitro / 中华整形外科杂志

<p><b>OBJECTIVE</b>To construct lentivector carrying Tie2-Small interfering RNA (SiRNA), so as to study its influence on malignant melanoma cells.</p><p><b>METHODS</b>Recombinant plasmid pSilencer 1.0-U6-Tie2-siRNA and plasmid pNL-EGFP were digested with XbaI, ligated a target lentiviral transfer plasmid of pNL-EGFP-U6-Tie2-I or pNL-EGFP-U6-Tie2-II, and then the electrophoresis clones was sequenced. Plasmids of pNL-EGFP-U6-Tie2-I and pNL-EGFP-U6-Tie2-II were constructed and combined with pVSVG and pHelper, respectively, to constitute lentiviral vector system of three plasmids. The Lentiviral vector system was transfected into 293T cell to produce pNL-EGFP-U6-Tie2- I and pNL-EGFP-U6-Tie2-II lentivirus. Then the supernatant was collected to determine the titer. Malignant melanoma cells were infected by both lentiviruses and identified by Realtime RT-PCR to assess inhibitory efficiency.</p><p><b>RESULTS</b>The recombinant lentiviral vectors of Tie2-RNAi were constructed successfully which were analyzed with restriction enzyme digestion and identified by sequencing. And the titer of lentiviral vector was 8.8 x 10(3)/ml, which was determined by 293T cell. The results of Realtime RT-PCR demonstrated that the lentiviral vectors of Tie2-RNAi could infect malignant melanoma cells and inhibit the expression of Tie2 genes in malignant melanoma cells (P<0.01). There was no significant difference in the expression level (P>0.05) between the two lentiviral vectors of Tie2-RNAi.</p><p><b>CONCLUSIONS</b>Lentivector carrying Tie2-SiRNA can be constructed successfully and inhibit the expression of Tie2 gene in vitro significantly. The study will supply the theory basis for the further research on the inhibition of tumor growth in vivo.</p>

Experimental study of repairing skull defect with autogenous cranial bone dust / 中华整形外科杂志

<p><b>OBJECTIVE</b>To build animal model of skull defect for the basic research of skull defects reconstruction with autogenous cranial bone dust and its relevance to the clinical application.</p><p><b>METHODS</b>Three full-thickness parietal skull defects (A, B and C) were created in 30 New Zealand white rabbits. The size of all the defects was 1 cm in diameter. The defect A was left untreated as control. Defects B and C were reconstructed with autogenous cranial bone dust. Two pieces of pyroxylin membrane were placed on the top and bottom of the defect B. every 10 rabbits were killed for analysis at 4, 8, 12 weeks after operation.</p><p><b>RESULTS</b>Defect A was largely repaired with connective tissue. Defect B was repaired rapidly with newly formed cancellous bone in the early period, but the following process of the growth, remodeling and maturing of the newly-formed cancellous bone was slowly. The bone ingrowth in defect C was more mature, but could not repair the defect completely, especially in the central zone. The grafted bone dust was absorbed gradually. Active angiogenesis could be observed in the newly formed bone. For the same defect, new bone had a greater amount of calcium at 12 weeks than at 4 and 8 weeks after operation (P < 0.05). And the calcium content of new bone was higher in defect C than in defect B at 8, 12 weeks after operation (P < 0.05).</p><p><b>CONCLUSIONS</b>The osteogenesis and angiogenesis are closely related to the time and location. The pyroxylin membrane can significantly promote the formation of cancellous bone in defect with autogenous bone dust graft during the early period.</p>

Expression and significance of Ang1, Ang2 and receptor Tie2 in hemangioma / 中华整形外科杂志

<p><b>OBJECTIVE</b>To investigate the relationship of angiogenesis and the Ang family members/ receptor (Ang/Tie2) in hemangioma.</p><p><b>METHODS</b>Expression of Ang1, Ang2 and the receptor Tie2 was detected with immunohistochemical SP method and RT-PCR method in 17 cases of proliferating hemangioma, 13 involuting cases and 10 cases of normal children skin.</p><p><b>RESULTS</b>The expression of Ang2 and Tie2 was higher markedly in proliferating hemangiomas than in involuting hemangiomas (P < 0.01), and was rare or negative in normal skin. Expression of Ang1 was rare or negative both in hemangioma and normal skin without significant difference between them (P > 0.05).</p><p><b>CONCLUSION</b>Ang/Tie2 system may play an important role in the proliferating and involuting process of hemangioma.</p>

Estrogen on stimulating the angiogenesis of children's hemangioma in vitro / 中华整形外科杂志

<p><b>OBJECTIVE</b>To demonstrate that estrogen stimulates the angiogenesis of children' s hemangioma.</p><p><b>METHODS</b>A piece of hemangioma biopsy was embedded in fibrin gel, and a model in vitro of angiogenesis of human hemangioma was then established. The angiogenesis of hemangioma in each group was interfered by the estrogen and tamoxifen. There were four groups divided into the followings: the group with estrogen, the group with tamoxifen, the group with estrogen + tamoxifen and the control. The dimension of newborn tubule area in the 3rd, 6th, 9th day after the culture was calculated to compare statistically differences among the groups.</p><p><b>RESULTS</b>In the model of angiogenesis of hemangioma, microvessels grew out from the tissue sample in 2 to 3 days after the culture, and in 8 to 9 days a complex network of microvessels had been shown, the tending to inactivity. On the 3rd,6th and 9th day after the culture the dimension of newborn tubule area of the group of estrogen [(2.84 +/- 0.20) mm2 (12.93 +/- 0.85) mm2 (22.47 +/- 1.40) mm2] were larger than those of the control [(1.98 +/- 0.17) mm2, (7.51 +/- 0.48) mm2, (11.26 +/- 0.73) mm2]. Those of the group of estrogen + tamoxifen [(1.08 +/- 0.11) mm2, (3.54 +/- 0.31) mm2, (5.72 +/- 0.40 mm2] and the group of tamoxifen [(1.13 +/- 0.14) mm2 (4.26 +/- 0.29) mm2, (6.08 +/- 0.42) mm2] were smaller than those of the groups of the estrogen and the control (P < 0.05).</p><p><b>CONCLUSIONS</b>The estrogen may stimulate the angiogenesis of children's hemangioma, and the tamoxifen may reverse the process.</p>

The reconstruction of funnel chest deformity with the reversed transplantation of sternum-costicartilage flap carried by the abdominal rectus pedicle / 中华整形外科杂志

<p><b>OBJECTIVE</b>To investigate the reconstructive operative procedures of funnel chest with "sternum-costicartilage" flap carried by the abdominal rectus pedicle.</p><p><b>METHODS</b>(1) In accordance with the lesioned area of funnel-like depressed deformity of anterior thoracic wall, a perpendicular median incision was designed and made; (2) The "sternum-costicartilage" flap carrying the abdominal rectus pedicle was used and reversed and transplanted to reconstruct severe funnel chest deformity.</p><p><b>RESULTS</b>The procedure was used in 7 cases from 1999 to 2005. The results of surgery were satisfactory. There were no recurrence after operation.</p><p><b>CONCLUSIONS</b>The procedure reported here is rather safe, solid and sound with good therapeutic results, and is of great value in clinical practice.</p>

A three-dimension in vitro model for angiogenesis of hemangioma / 中华整形外科杂志

<p><b>OBJECTIVE</b>To create a three dimension (3D) in vitro model for angiogenesis of hemangioma.</p><p><b>METHOD</b>The fragment of hemangioma specimen was embedded in fibrin gel to set up the three-dimension (3D) in vitro model for angiogenesis of hemangioma.</p><p><b>RESULT</b>In the model, microvessels grew out from the tissue fragments at the 2nd to 3rd day after culture, and at the 8th to 9th day a compact network of microvessels come into being, then tending to be stationary. The compact network around the tissue fragment was confirmed to be blood vessels by immunohistochemistry and electron microscopy.</p><p><b>CONCLUSION</b>This model helps to study the mechanism of hemangioma angiogenesis and investigate the drugs of anti-angiogenesis.</p>

Expression of apoptosis and Bcl-2, Bax in hemangioma and vascular malformations / 中华整形外科杂志

<p><b>OBJECTIVE</b>To study the expression of apoptosis and their regulatory genes, Bcl-2, Bax in hemangioma and vascular malformations.</p><p><b>METHODS</b>The specimens were taken from 68 cases of strawberry hemangioma or vascular malformations and 11 cases of normal skin. The expression of Bcl-2, Bax and Ki-67 in endothelial cells were investigated by immunohistochemical S-P method. The apoptosis index (AI) in endothelial cells was investigated by TUNEL method.</p><p><b>RESULTS</b>Ki-67 was positive in all the proliferating strawberry hemangioma, negative in the other groups. The expression of Bax was significantly higher in strawberry hemangioma than in vascular malformations and normal skin (P < 0.01). Bcl-2 was negative in all groups. The AI in endothelial cells of strawberry hemangioma was significantly higher than that of vascular malformations and normal skin. There were no statistically significant differences between the proliferating and involution strawberry hemangioma. There were no statistically significant differences between various types of vascular malformations and normal skin. With the increasing of the expression of Bax in strawberry hemangioma, the AI increased.</p><p><b>CONCLUSION</b>These findings clearly demonstrate a much higher apoptotic activity in strawberry hemangioma than in vascular malformations and normal skin and suggest that apoptosis might be a cause of spontaneous involution of strawberry hemangioma and might not be a cause of the pathogenesis of vascular malformation. Bcl-2, Bax might play an important regulatory role in apoptosis in endothelial cells of strawberry hemangioma.</p>