缺氧缺血型狭长窄蒂皮瓣成活过程中基质细胞衍生因子-1、CD34及微血管密度的表达

目的检测基质细胞衍生因子-1（stromal cell—derived factor-1，SDF-1）、CD34、微血管密度（MVD）在缺氧缺血型狭长窄蒂皮瓣组织的不同时间、不同面积的表达，以及SDF-1在狭长窄蒂皮瓣组织血管新生中的作用。方法在5头家猪两侧背部各制作蒂部长宽比为4：2，携带皮瓣面积分别为2cm×2cm（A组）、3cm×3cm（B组）、4cm×4cm（C组）、5cm×5cm（D组）和6cm×6cm（E组）共5组的窄长蒂皮瓣模型。对5组皮瓣进行大体观察、皮瓣成活情况、光镜下检测MVD、免疫组织化学及酶联免疫技术（ELISA），检测皮瓣远端组织在术后0、3、5、7、14d时，SDF-1和CD34表达。结果（1）同一组狭长窄蒂皮瓣，随着时间推移，SDF-1、CD34及MVD表达也随之增加，SDF-1在第5天达最高值（A组124．80±4．05，B组137．85±3．03，C组166．53±2．98，D组72．80±2．63，E组62．79±2．20）；CD34在第7天达最高值（A组16．76±0．62，B组17．60±0．72，C组18．48±0．55，D组12．70±0．60，E组11．51±0．70）；MVD在第7天达最高值（A组52．45±2．78，B组59．34±3．12，c组61．14±3．35，D组25．25±3．78，E组24．46±7．46），随后逐渐下降。（2）不同组狭长窄蒂皮瓣，随着皮瓣面积的增大，SDF-1、CD34及MVD的表达也随之增加，当面积达5cm×5cm时，各项指标不再增加，皮瓣远端出现部分坏死。结论SDF-1对狭长窄蒂皮瓣成活中的新生血管起一定的调节作用。

Expression of SDF-1 and CD34 and changes of MVD in survival process of narrow pedicle flap upon hypoxia and ischemia

Objective To detect the expression of SDF-1 and CD34,and MVD changes at slen der narrow pedicle flap of hypoxia and ischemia during the survival process,and to investigate the role of SDF-1 at flap neovascularization.Methods The slender narrow pedicle flaps,which pedicle's length-breadth ratio were 4 ∶ 2,and the flap size of each took an area of 2 cm × 2 cm (group A),3 cm ×3 cm (group B),4 cm × 4 cm (group C),5 cm × 5 cm (group D) and 6 cm × 6 cm (group E),were designed and elevated on each pigs' double dorsum.The flaps were served as a hypoxia/ischemia flap model.The survival area,histologic analysis,SDF-1 and CD34 enzyme-linked immunosorbent assay at the distal flap were evaluated at days 0,3,5,7,and 14 after operation,respectively.Results In the each group of flaps,the expression of SDF-1,CD34 and MVD increased with time,reached the plateau level after 5 days (maximal values of SDF-1:124.80 ± 4.05 ingroup A,137.85 ±3.03 in group B,166.53 ± 2.98 in group C,72.80 ± 2.63 in group D and 62.79 ± 2.20 in group E),7 days ( maximal values of CD34:16.76 ± 0.62,17.60 ± 0.72,18.48 ± 0.55,12.70 ± 0.60,and 11.51 ± 0.70,each group),and 7 days (maximal values of MVD:52.45 ± 2.78,59.34 ± 3.12,61.14 ± 3.35,25.25 ± 3.78,and 24.46 ± 7.46,each group),and then gradually decreased.In the different groups of flaps,when the flap area increased,the expression of SDF-1,CD34 and MVD increased,but the parameters decreased at the area of 5 cm × 5 cm,and the flaps were partial necrosis.Conclusions SDF-1 may play an adjusted role in the survival process of the slender narrow pedicle flap.