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Bisphosphonate-induced ATP analog formation and its effect on inhibition of cancer cell growth

Hannu Mönkkönen1, Johanna Kuokkanen, Ingunn Holen

  • 1Department of Pharmaceutics, University of Kuopio, Kuopio, Finland. hannu.monkkonen@uku.fi

Anti-Cancer Drugs
|May 6, 2008
PubMed

Insights

Bisphosphonates (BPs) generate cytotoxic ATP analogs in cancer cells, inhibiting their growth. Nitrogen-containing BPs form ApppI by inhibiting farnesyl diphosphate synthase, while other BPs metabolize differently, impacting potency.

Area of Science:

  • Biochemistry
  • Oncology
  • Pharmacology

Background:

  • Bisphosphonates (BPs) are established inhibitors of bone resorption in cancer.
  • Emerging evidence suggests BPs also possess direct anti-cancer properties, inhibiting cell growth, attachment, invasion, and promoting apoptosis.
  • The precise molecular mechanisms underlying these anti-tumor effects are under investigation.

Purpose of the Study:

  • To investigate the formation of bisphosphonate-induced ATP analogs in various cancer cell lines.
  • To determine the impact of these ATP analogs on cancer cell growth and survival.
  • To elucidate the role of specific enzymes in BP-induced cytotoxic metabolite production.

Main Methods:

  • Cancer and non-malignant breast cells were treated with zoledronic acid (a nitrogen-containing BP) or clodronate (a non-nitrogen-containing BP).
  • Zoledronic acid-induced ApppI accumulation and clodronate metabolism to AppCCl2p were evaluated.
  • Inhibition of cell growth was assessed across a range of BP concentrations and treatment durations.

Main Results:

  • Significant variations in zoledronic acid-induced ApppI formation and clodronate metabolism were observed among different cancer cell lines.
  • The potency of clodronate in inhibiting cancer cell growth correlated with its ATP analog formation.
  • Cellular responses to BPs appear dependent on the activity of enzymes like farnesyl diphosphate synthase and aminoacyl-tRNA synthetases.

Conclusions:

  • Bisphosphonates induce the formation of cytotoxic ATP analogs in tumor cells, contributing to their anti-cancer effects.
  • The specific mechanism of ATP analog formation and its efficacy vary between different types of BPs and cancer cell lines.
  • Enzyme activity, particularly farnesyl diphosphate synthase, plays a crucial role in BP-mediated cancer cell growth inhibition.

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