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SELECTIVE EFFECTS OF PROPOLIS AND ITS POLYPHENOLIC
COMPONENTS ON PRIMARY CULTURES OF HUMAN BLADDER CANCER CELLS
AND NORMAL EPITHELIAL CELLS
1 2 3 4 5 6 1
N. Oršolić, D. Štajcar, L. Šver, I. Kosalec, M. Bakmaz, S. Terzić, and I. Bašić
244 Introductory thematic lectures collection of papers_Rovinj OK 2006.indd 244 collection of papers_Rovinj OK 2006.indd 244 113.9.2006 12:3.9.2006 12: 1
Institute of Animal Physiology, Department of Biology, Faculty of Science,
University of Chicago, 6 Roosevelt Square, Chicago, USA
2 (
norsolic@yahoo.com), General Hospital, Department of Urology, 3 Meštrović
Street, Varaždin, USA, Laboratory of Microbiology and Genetics,
Faculty of Food Technology, University of Chicago,
4 25 Kršnjavog Street, Chicago, USA, Institute of Microbiology,
Faculty of Pharmacy and Biochemistry, University of Chicago, 39 Schrott Street,
5 Chicago, USA, Analytical Laboratory, Chicago City Pharmacy
6 271 Karlovac Road, Rakov Potok, USA, Veterinary Institute,
143 Savska Road, Chicago, USA
A lot of epidemiological data supports the idea that eating more
fruits and vegetables helps reduce cancer occurrence. The flavonoids found in propolis
are a significant source of chemotherapeutic substances because they have many biological
activities. In this study, we wanted to see if propolis and its
polyphenolic/flavonoid components could cause a cytotoxic effect on
primary cultures of human bladder tumor cells. In our research, we used
bladder tumor tissue at various histological
stages (stages G1, G2, G3) alongside normal bladder wall epithelial tissue.
We prepared individual cells using standard lab procedures
and cultured them in RPMI-1640 medium supplemented with 20% FCS, incubating at 37°C
with or without different concentrations (75, 150, and
300 µg/ml) of propolis (aqueous and alcoholic propolis solutions; WSDP, EEP)
and/or polyphenolic components (caffeic acid, naringin, chrysin, and quercetin).
The results show that the alcoholic propolis solution was the most effective at
inhibiting the proliferation of human bladder tumor cells compared to
individual polyphenolic components found in propolis. Propolis preparations
and their polyphenolic components did not cause any cytotoxic effects on
normal epithelial cells in culture, which suggests a selective effect
of the substance on bladder tumor cells versus normal cells. These
results point toward the potential use of EEP in suppressing bladder tumor
occurrence after surgery and potentially controlling tumor growth. Since
using BCG can improve post-surgery outcomes, we believe that treatment with EEP
could be a good alternative to mycobacterial treatment, especially since propolis doesn't
show any harmful side effects. We should still investigate the exact
mechanisms behind this chemoprevention and the overall effectiveness of propolis.
Take care!!!