E. Grabowska et al., BROMELAIN PROTEASES SUPPRESS GROWTH, INVASION AND LUNG METASTASIS OF B16F10 MOUSE MELANOMA-CELLS, International journal of oncology, 11(2), 1997, pp. 243-248
The thiolprotease bromelain, isolated from pine apple stem, was sugges
ted for use in adjuvant tumor therapy. This study examined the in vitr
o effects of crude bromelain, bromelain F9 and papain on B16F10 mouse
melanoma cell lung colonization, in vitro cell proliferation, invasion
through matrigel and CD44 expression. In vitro treatment of the melan
oma cells with bromelain F9 and papain before i.v. injection into mice
prevented lung colonization. The lung weight at day 20 was significan
tly reduced from 5.1% (untreated cells) to 1.6% (bromelain F9 treated
cells). Papain was as effective as bromelain F9. However, there was no
difference in the lung weight between bromelain F9 treated and the un
treated group at day 27. Protease removal and further incubation of th
e B16F10 cells retained their capacity to induce lung tumor metastases
. The proteases inhibited growth of the melanoma cells in a dose depen
dent manner. Crude bromelain was most active with a half maximal value
of 7.5 mu g/ml. However, the antiproliferative effects did not correl
ate with the proteolytic activity. In a matrigel invasion assay, the p
roteases reduced the invasive capacity of the melanoma cells maximally
by about 30%. Using flow cytometry, the proteases were found to reduc
e the CD44 density, present on the melanoma cells, to a different degr
ee: crude bromelain was more active than bromelain F9 and papain, whic
h had higher proteolytic activity. Crude bromelain was most active in
abolishing the CD44 re-expression after protease treatment.