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Differential inhibition of human cancer cell proliferation by citrus limonoids

Q Tian1, E G Miller, H Ahmad

  • 1Texas A&M University-Kingsville Citrus Center, Weslaco, TX 78596, USA.

Nutrition and Cancer
|April 19, 2002
PubMed

Insights

Citrus limonoids show antiproliferative effects against human breast cancer cells (MCF-7) in a dose-dependent manner. While apoptosis was observed at high concentrations, further research is needed to confirm the mechanism of action for these potent compounds.

Area of Science:

  • Phytochemistry
  • Cancer Biology
  • Cellular Pharmacology

Background:

  • Limonoids, naturally occurring compounds in citrus fruits like mandarin (Citrus reticulata Blanco), are known for their potential health benefits.
  • Previous studies indicated limonoids can inhibit the growth of both estrogen receptor-negative and -positive human breast cancer cells in vitro.

Purpose of the Study:

  • To evaluate the antiproliferative activity of specific limonoids and a limonoid glucoside mixture against various human cancer cell lines.
  • To determine the dose and time dependency of the observed effects on cancer cell growth.

Main Methods:

  • Testing of five citrus limonoids (obacunone 17 beta-D-glucopyranoside, nomilinic acid 17 beta-D-glucopyranoside, limonin, nomilin, and a limonoid glucoside mixture) against six human cancer cell lines (leukemia HL-60, ovary SKOV-3, cervix HeLa, stomach NCI-SNU-1, liver Hep G2, and breast MCF-7).
  • Growth inhibition was assessed, and flow cytometry was used to investigate apoptosis induction in MCF-7 cells.
  • Experiments were conducted at a concentration of 100 micrograms/ml for individual limonoids and the mixture.

Main Results:

  • Significant growth inhibition was observed for the four individual limonoids and the limonoid glucoside mixture against human breast cancer (MCF-7) cells.
  • The antiproliferative activity against MCF-7 cells was found to be dose and time dependent.
  • No significant effects were noted on other tested cancer cell lines (HL-60, SKOV-3, HeLa, NCI-SNU-1, Hep G2) with individual limonoids at 100 µg/ml.
  • The limonoid glucoside mixture showed partial inhibition of SKOV-3 cells at 100 µg/ml.
  • Apoptosis was induced in MCF-7 cells by all tested limonoid samples at high concentrations (100 µg/ml), though this may not be the primary cytotoxic mechanism.

Conclusions:

  • Citrus limonoids exhibit significant antiproliferative effects specifically against human breast cancer (MCF-7) cells.
  • The observed cytotoxic effects at high concentrations may involve apoptosis, but further investigation is required to elucidate the precise mechanism of action.
  • The differential activity across cancer cell lines suggests potential for targeted therapeutic development, warranting further research into citrus limonoids' anticancer properties.

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