Diversity of CD97 in smooth muscle cells

被引:19
作者
Aust, G
Wandel, E
Boltze, C
Sittig, D
Schütz, A
Horn, LC
Wobus, M
机构
[1] Univ Leipzig, Dept Surg, Fac Med, Res Labs,Ctr Surg, D-04103 Leipzig, Germany
[2] Univ Rostock, Dept Pathol, D-18055 Rostock, Germany
[3] Univ Leipzig, Inst Pathol, D-04103 Leipzig, Germany
关键词
CD97; smooth muscle cell; leiomyoma; leiomyosarcoma; N-glycosylation; human;
D O I
10.1007/s00441-005-0103-2
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
CD97, an epidermal growth factor (EGF)-TM7 receptor, is not restricted to hematopoetic and carcinoma cells but is also found on smooth muscle cells (SMC). We have examined its location and biochemical structure in various normal and tumorigenic SMC-containing tissues. SMC of the urinary bladder, lung bronchi and bronchioles, myometrium, and gastrointestinal tract were immunohistologically stained by using monoclonal antibodies (mabs) to the CD97 stalk region (CD97(stalk)). Mabs directed against an N-glycosylation-dependent epitope within the EGF-domains (CD97(EGF)) did not bind to normal SMC. Vascular SMC, which was also CD97(EGF)-negative, showed further CD97 heterogeneity. Only a few, if any, SMC from the aorta or elastic arteries of the systemic circulation were positive for CD97 mRNA and therefore also for CD97(stalk). CD97(stalk)-positive SMC were slightly more numerous in muscular and peripheral arteries. In contrast, most venous SMC expressed CD97stalk. A comparison with other SMC molecules revealed a similar but not identical staining pattern for CD97(stalk) and desmin. Further CD97 heterogeneity was observed during SMC transformation. All leiomyomas (n= 5) and nine out of 21 leiomyosarcomas were positive for both CD97stalk and CD97(EGF). As expected, CD97(EGF)-positive SMC tumors expressed partly N-glycosylated CD97. Seven out of 21 leiomyosarcomas were completely devoid of CD97. Thus, CD97 showed variable expression in vascular and biochemical modification in tumorigenic SMC, suggesting that the function of the molecule is specific for the SMC subtype.
引用
收藏
页码:139 / 147
页数:9
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