Tannic Acid preferentially targets estrogen receptor-positive breast cancer

Area of Science:

• Biochemistry
• Oncology
• Natural Products Chemistry

Background:

• Natural compounds are increasingly explored for cancer treatment.
• Tannic acid (TA) is a hydrolysable tannin found in plants and foods.
• TA is known for its collagen cross-linking properties.

Purpose of the Study:

• To create tannic acid-cross-linked collagen beads.
• To evaluate the impact of these beads on breast cancer cell proliferation and apoptosis.
• To investigate the specific mechanisms of TA-induced cell death.

Main Methods:

• Preparation of collagen beads cross-linked with varying concentrations of tannic acid.
• Assessment of bead stability at body temperature.
• Exposure of normal and breast cancer cells to TA-cross-linked beads.
• Analysis of cell proliferation, apoptosis markers (caspase 3/7, 9, and 8), and estrogen receptor (ER) status.

Main Results:

• TA-cross-linked collagen beads were stable at body temperature.
• Higher concentrations of TA significantly inhibited cell proliferation and induced apoptosis in both normal and cancer cells.
• TA-induced apoptosis was mediated by the activation of caspase 3/7 and caspase 9.
• Estrogen receptor-positive (ER(+)) breast cancer cells showed increased susceptibility to TA's effects.

Conclusions:

• Tannic acid-cross-linked collagen beads demonstrate anti-cancer properties.
• TA induces apoptosis through the intrinsic caspase pathway.
• TA shows particular efficacy against ER(+) breast cancer cells.
• Tannic acid holds potential as a therapeutic or preventative agent for ER(+) breast cancer.