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Blackberry extracts inhibit activating protein 1 activation and cell transformation by perturbing the mitogenic

Rentian Feng1, Linda L Bowman, Yongju Lu

  • 1Pathology and Physiology Research Branch, Helath Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA.

Nutrition and Cancer
|December 2, 2004
PubMed

Insights

Blackberry extract, rich in antioxidants, effectively inhibits cancer cell proliferation and neoplastic transformation. It works by scavenging free radicals and blocking key signaling pathways involved in carcinogenesis.

Area of Science:

  • Phytochemistry
  • Cancer Biology
  • Molecular Signaling

Background:

  • Blackberries are rich in bioflavonoids and phenolic compounds with potential chemopreventive properties.
  • Cancer development involves cell proliferation, neoplastic transformation, and complex signaling pathways.
  • Understanding the mechanisms of natural compounds is crucial for developing cancer prevention strategies.

Purpose of the Study:

  • To investigate the effects of fresh blackberry extracts on cancer cell proliferation and neoplastic transformation.
  • To elucidate the underlying signal transduction mechanisms affected by blackberry extract.
  • To evaluate the antioxidant capacity and free radical scavenging activity of blackberry extract.

Main Methods:

  • Electron spin resonance (ESR) for free radical scavenging assessment.
  • In vitro assays using human lung cancer cell line (A549) and JB6 P+ cells.
  • Measurement of 8-hydroxy-2'-deoxyguanosine (8-OHdG) formation, AP-1 transactivation, and MAPK phosphorylation (ERK, JNK, p38).

Main Results:

  • Blackberry extract demonstrated significant free radical scavenging activity.
  • Extract inhibited A549 cell proliferation and UVB-induced 8-OHdG formation.
  • Extract suppressed TPA-induced neoplastic transformation in JB6 cells.
  • Blackberry extract blocked UVB- and TPA-induced AP-1 transactivation and phosphorylation of ERK and JNK pathways.

Conclusions:

  • Fresh blackberry extract exhibits chemopreventive potential against tumor promoter-induced carcinogenesis.
  • Antioxidant properties of blackberry extract contribute to its effects by inhibiting reactive oxygen species (ROS).
  • The extract modulates key signaling pathways, including AP-1 and MAPK, suggesting a role in cancer prevention.

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