Apigenin Induces Apoptosis through a Mitochondria/Caspase-Pathway in Human Breast Cancer MDA-MB-453 Cells

Eun Jeong Choi1, Gun-Hee Kim

  • 1Plant Resources Research Institute, Duksung Women's University, 419 Ssangmun-dong, Tobong-ku, Seoul 132-714, South Korea.

Insights

Apigenin, a potential anticancer drug, triggers programmed cell death (apoptosis) in breast cancer cells. It activates both intrinsic and extrinsic cell death pathways by cleaving key caspases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Apigenin is investigated as a non-cytotoxic anticancer agent.
  • Understanding its mechanism in apoptosis is crucial for drug development.

Purpose of the Study:

  • To elucidate the role of the caspase cascade in apigenin-induced apoptosis.
  • To determine if apigenin activates both intrinsic and extrinsic apoptotic pathways.

Main Methods:

  • Treatment of MDA-MB-453 human breast cancer cells with varying concentrations of apigenin.
  • Assessment of cell proliferation inhibition and apoptosis induction.
  • Analysis of caspase cleavage and cytochrome c release.

Main Results:

  • Apigenin inhibited breast cancer cell proliferation in a dose- and time-dependent manner.
  • Apigenin induced apoptosis, cytochrome c release, and cleavage of caspase-9.
  • Apigenin activated caspase-3, leading to the cleavage of caspases-6, -7, and -8, indicating activation of both intrinsic and extrinsic pathways.

Conclusions:

  • Apigenin-induced apoptosis in breast cancer cells involves the caspase cascade.
  • Apigenin activates both the intrinsic and extrinsic apoptotic pathways, supporting its potential as an anticancer therapeutic.

Related Concept Videos

The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
Apoptosis01:30

Apoptosis

Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Caspases01:24

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.