尿道瘢痕组织胶原酶活性及TIMP-1表达的研究

DETECTION OF COLLAGENASE ACTIVITY AND TISSUE INHIBITOR OF METALLOPROTEINASE-1 EXPRESSION LEVEL IN THE URETHRAL SCAR TISSUE/

目的 比较正常尿道组织和尿道瘢痕组织中胶原酶活性以及金属蛋白酶组织抑制剂 - 1(TIMP- 1)的表达 ,探讨其对尿道瘢痕组织降解的影响。 方法 取手术切除的尿道狭窄段瘢痕组织和脑死亡患者的正常尿道组织各10例 ,采用 EL ISA法检测组织中胶原酶活性及逆转录 -聚合酶链反应 (RT- PCR)检测 TIMP- 1m RNA的表达。 结果 尿道瘢痕组织中胶原酶的活性为 (15 .32± 2 .2 9) U,正常尿道组织的胶原酶活性为 (2 4 .6 7± 6 .78) U,瘢痕组织的胶原酶活性低于正常尿道组织 ,差异有统计学意义 (P<0 .0 1)。与正常尿道组织比较 ,尿道瘢痕组织的 TIMP- 1表达明显升高、差异有统计学意义 (P<0 .0 5 )。 结论 TIMP- 1表达升高、胶原酶活性降低影响了尿道瘢痕组织的降解 ,可能是尿道瘢痕增生的原因之一。

Objective To find the difference between the collagenase activity and tissue inhibitor of metalloproteinase-1 (TIMP-1) expression level in normal urethral tissue and in urethral scar tissue, and to study the effect of collagenase activity and TIMP-1 expression level on the degradation of urethral scar. Methods The urethral tissues were derived from 10 human surgical specimens of urethral stricture scar and 10 human normal urethral specimens from patients with brain death. The collagenase activity was detected by ELISA assay, and the TIMP-1 mRNA level by RT-PCR. Results The collagenase activity of urethral scar tissue was (15.32±2.29) U and lower than that of normal urethral tissue (24.67±6.78) U, there was significant difference between them (P<0.01). The TIMP-1 expression level of urethral scar tissue was higher than that of normal urethral tissue, there was significant difference between them (P<0.05).Conclusion The high level of TIMP-1 expression and the low collagenase activity in urethral scar tissue may inhibit the degradation of urethral scar, and may be one of important causes of the scar tissue hyperplasia.