Morphological characterization of type B synoviocytes in the temporomandibular joint focusing on expression of the muscle specific proteins

颞下颌关节（TMJ）的成纤维细胞样B型滑膜细胞（B型细胞）在形态和免疫反应性上是异质的。本研究发现，部分B型细胞在成年大鼠TMJ中表达desmin，一种肌肉特异性的中间纤维。desmin阳性B细胞的免疫细胞化学特征表明该细胞不具有肌生成或收缩能力。此外，它们的免疫反应模式和超微结构与血管生成过程中毛细血管周细胞的前体相似。

Fibroblast-like type B synoviocytes(type B cells) in the temporomandibular joint(TMJ) are heterogeneous in their morphology and immunoreactivity. This study revealed that some of the type B cells expressed desmin, a muscle-specific intermediate filament, in adult rat TMJ. Immunocytochemical characteristics of the desmin-positive type B cell suggested that this cell does not have myogenic or contractile ability. In addition, their immunoreaction patterns and ultrastructures resembled those of a precursor of a capillary pericyte during angiogenesis.