treatment of fibroblasts with phorbol myristate acetate ( pma ; 10 ( -8 ) m ) induced the synthesis and secretion of large amounts of collagenase : this was inhibited if the cells were treated with retinoic acid ( 10 ( -6 ) m ) or dexamethasone ( 10 ( -7 m ) .
C0016030
fibroblasts
C0007634
cells