Levels of Rab27a, IL-11, activated T-cell nuclear factor 1 (NFATc1), TRAP and GAPDH protein were analyzed using western blotting analysis, as previously described (17 (link)). The primary antibodies used were Rab27a (ab55667, 1:500), IL-11 (ab187167, 1:1,000), NFATc1 (ab25916, 1:1,000), TRAP (ab65854, 1:1,500) and GAPDH (ab8245, 1:3,000), which were all purchased from Abcam.