Abstract:AIM To investigate the effect of hyaluronic acid stimulating factor(HASF)on the hyaluronic acid(HA)syn-thesis of hypertrophic scar-derived fibroblasts cultured three-dimensionally in the HASF,isolat-ed from the fetal rabbit sera and amniotic fluid,was added to the monolayer and three-dimensional fibroblast culture sys- concentration of HA in the supernatant of the fi-broblast culture systems was measured using radioim┐ Concentration of HA in the mono-layer system increased from(495±37)mg・L-1 to(914±75)mg・L-1 in a dose-dependent manner with the increase of HASF ・L-1 ・L-1 (P<).The concentration of HA reached the maximam when HASF a