8455
These results indicate that the adhesion of RA synovial cells to matrices such as hyaluronic acid through CD44 could up-regulate VCAM-1 expression and VCAM-1 -mediated adhesion to T cells , which might in turn cause activation of T cells and synovial cells in RA synovitis .
 ( cell type: T cells, None) , ( protein: VCAM-1, None) , ( cell type: T cells, None) , ( cell type: synovial cells, None) , ( protein: CD44, None) , ( protein: VCAM-1, None) , ( cell type: RA synovial cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: T cells, None) , ( protein: VCAM-1, None) , ( cell type: T cells, None) , ( cell type: synovial cells, None) , ( protein: CD44, None) , ( protein: VCAM-1, None) , ( cell type: RA synovial cells, None) 