异种异体和同种异体半月板移植术后兔半月板和关节软骨中Ⅰ、Ⅱ、Ⅲ、Ⅹ型胶原表达和免疫排斥研究

目的 :研究同种异体半月板移植和异种异体半月板移植后 ,移植半月板和关节软骨中的Ⅰ、Ⅱ、Ⅲ、Ⅹ型胶原表达和免疫排斥反应发生的情况。方法 :切除 30只成年新西兰白兔的内侧半月板造成半月板缺失的动物模型。A组进行同种异体内侧半月板移植。B组取猪半月板组织修剪成同兔内侧半月板形态和尺寸相同的异种异体半月板植入物 ,进行兔内侧半月板的异种异体移植。分别在术后第 6周、12周、2 4周取实验动物的半月板、关节软骨进行Ⅰ、Ⅱ、Ⅲ、Ⅹ型胶原的单克隆抗体的免疫组织化学染色 ,并取外周血进行补体依赖性微量淋巴细胞毒实验 (CDMT) ,用放射免疫法检测血清中IL - 2和IL - 6的含量 ,了解是否发生免疫排斥反应。结果 :同种异体半月板移植后 ,关节软骨和移植半月板的情况良好 ,但术后第 2 4周 ,异种异体移植物部分被吸收 ,关节软骨出现损伤。两组中各时段移植半月板中的Ⅰ、Ⅱ和Ⅲ型胶原的表达情况无明显差异 ,术后第 12周 ,两组关节软骨中Ⅰ、Ⅱ和Ⅲ型胶原的表达情况相似 ,但术后第 2 4周 ,异种异体半月板组的关节软骨开始有异常Ⅹ型胶原表达。同种异体和异种异体半月板移植组均未发现致命的免疫排斥反应发生。结论 :用猪的半月板组织塑形后移植替代兔内侧半月板组织 ,半年后移植物被溶解吸收 ,同种异体?

TypeⅠ,Ⅱ,Ⅲ,ⅩCollagen Expression in Meniscus and Articular Cartilage and Immunoreaction Study after Xenogenic and Allogenic Meniscus Transplantation in Rabbits

Objective To study the type Ⅰ,Ⅱ,Ⅲ and Ⅹcollag e n expression in meniscus and articular cartilage and immunoreactions post xenoge nic and allogenic meniscus transplantation. Methods After men iscectomy,30 adult New Zealand white rabbits were divded into two groups:group A undertook allogenic medial meniscus transplantation and group B undertook xenog enic meniscus transplantation with fitted meniscus tissues harvested from swine. 6, 12 and 24 weeks post transplantation, the histological and immunohistochemical analysis of type Ⅰ ,Ⅱ,Ⅲ and Ⅹ collagens monoclonal antibody were investigated in menisci and a rticular cartilage. Peripheral blood were obtained for immunoreactions study thr o ugh the methods of CDMT (Complement Dependent Microlymphocytotoxicity Test) and RIA (Radioimmunoassay)of IL-2 and IL-6. Results The meniscu s and articular cartilage were good post allogenic meniscus transplantation, but the transplanted xenogenic meniscus appeared to be dissolved and absorbed and c art ilage lesions were observed in 24 week post operation. No significant difference was found between two groups in type Ⅰ,Ⅱ and Ⅲ collagen expression during e xperiment. From 1～12 weeks, no significant diffe rence was found among type Ⅰ,Ⅱ and Ⅲ collagen expression in articular cartil age in two groups. However,24 weeks post operation, type Ⅹ collagen's expressio n in cartilage was abnormally increased. Neither allogenic nor xenogenic meniscu s transplantation caused fatal immunoreaction during the whole experiment. Con clusion The transplantation meniscus began to be dissolved and absorbed after half a year, but allogenic meniscus transplantation achieved good results . Type Ⅰ,Ⅱ and Ⅲ collagen expression in transplanted meniscus and articular cartilage showed no difference between two groups, but the expression of type Ⅹ collagen was abnormally increased in xenogenic group 24 weeks post operation. No fatal immunoreaction was found in both groups.