Related Experiment Video

Updated: Jun 24, 2026

Preparation of Cell-lines for Conditional Knockdown of Gene Expression and Measurement of the Knockdown Effects on E4orf4-Induced Cell Death
13:54

Preparation of Cell-lines for Conditional Knockdown of Gene Expression and Measurement of the Knockdown Effects on E4orf4-Induced Cell Death

Published on: October 21, 2012

Downregulation of PLK-1 expression in kaempferol-induced apoptosis of MCF-7 cells

Gum-Yong Kang1, Eung-Ryoung Lee, Jung-Hyun Kim

  • 1Institute of Biomedical Science and Technology, Department of Molecular Biotechnology, Konkuk University, Seoul, Republic of Korea.

European Journal of Pharmacology
|April 10, 2009
PubMed

Insights

Kaempferol, a compound found in food, triggers apoptosis in human breast cancer cells. It activates the intrinsic caspase cascade and downregulates polo-like kinase 1 (PLK-1), suggesting a role in cancer therapy.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Kaempferol is a flavonoid found in various foods with potential anti-cancer properties.
  • The precise mechanisms of kaempferol-induced cancer cell death are not fully understood.
  • Polo-like kinase 1 (PLK-1) is implicated in cell division and is often overexpressed in human tumors.

Purpose of the Study:

  • To investigate the molecular mechanisms of kaempferol-induced cell death in human breast cancer cells (MCF-7).
  • To determine the role of kaempferol in apoptosis and its effect on key regulatory proteins.

Main Methods:

  • Human breast cancer cell line (MCF-7) treated with kaempferol.
  • Flow cytometry to assess apoptosis (sub-G1 population).
  • Western blot analysis to detect cleaved Poly (ADP-ribose) polymerase (PARP), caspases (caspase-7, caspase-9), Bax, and polo-like kinase 1 (PLK-1) expression.

Main Results:

  • Kaempferol treatment induced apoptosis in MCF-7 cells, evidenced by sub-G1 accumulation and DAPI-stained apoptotic nuclei.
  • Western blot confirmed activation of the intrinsic apoptosis pathway through cleavage of PARP, caspase-7, caspase-9, and Bax.
  • Kaempferol significantly downregulated the expression of polo-like kinase 1 (PLK-1).

Conclusions:

  • Kaempferol induces apoptosis in human breast cancer cells via the intrinsic caspase cascade.
  • Downregulation of PLK-1 by kaempferol may contribute to its anti-cancer effects.
  • These findings highlight kaempferol's potential as a therapeutic agent against breast cancer.

More Related Videos

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death09:18

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

Related Concept Videos

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...