EXPRESSION OF PARATHYROID HORMONE (PTH)-RELATED PEPTIDE (PTHrP) AND PTH/PTHrP RECEPTOR IN GIANT CELL TUMOUR OF TENDON SHEATH

✍ Scribed by NAKASHIMA, MASAHIRO; ITO, MASAHIRO; OHTSURU, AKIRA; ALIPOV, GABIT KAIMOVICH; MATSUZAKI, SUMIHIRO; NAKAYAMA, TOSHIYUKI; YAMASHITA, SHUNICHI; SEKINE, ICHIRO

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 768 KB
• Volume: 180
• Category: Article
• ISSN: 0022-3417
• DOI: 10.1002/(sici)1096-9896(199609)180:1<80::aid-path617>3.0.co;2-a

✦ Synopsis

The giant cell tumour of tendon sheath (GCTTS) is mainly composed of mononucleated stromal cells (SC) and multinucleated giant cells (GC), so-called osteoclast-like GC. It is thought that G C are derived from SC, but their precise relationship is not fully understood. Parathyroid hormone (PTH)-related peptide (PTHrP) is now considered to be a cytokine for cell differentiation, which may stimulate osteoclast-like cell formation in haematopoietic cells. Five cases of GCTTS were evaluated immunohistochemically, using a variety of antibodies against PTHrP, PTHlPTHrP receptor, KP-1 as a histiocytic phenotypic antigen, fibronectin as a fibroblastic phenotypic antigen, and proliferating cell nuclear antigen (PCNA). In situ hybridization and immunohistochemistry revealed that in all cases both S C and GC expressed PTHrP. PTHlPTHrP receptor was observed only in histiocytic S C and GC, but not in fibroblastic SC. Almost all GC showed histiocytic features. PCNA immunoreactivity was detected only in the nuclei of SC, and not in GC. Moreover, SC with PTHlPTHrP receptor immunoreactivity were negative for PCNA. These results suggest that G C are derived from histiocytic S C expressing PTHlPTHrP receptor and losing proliferative activity in the process of transition from mononuclear to multinucleated. PTHrP produced by SC and GC may be involved in the formation of osteoclast-like cells in GCTTS by acting in an autocrinelparaerine fashion.