Related Experiment Video

Updated: Jul 7, 2026

Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
08:49

Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries

Published on: January 22, 2019

beta-Sitosterol induces G2/M arrest, endoreduplication, and apoptosis through the Bcl-2 and PI3K/Akt signaling

Dong-Oh Moon1, Mun-Ock Kim, Yung Hyun Choi

  • 1Faculty of Applied Marine Science, Cheju National University, Jeju Special Self-Governing Province 690-756, South Korea.

Cancer Letters
|March 4, 2008
PubMed

Insights

Beta-Sitosterol (SITO) shows anti-cancer potential by inducing endoreduplication and apoptosis in leukemia cells. It promotes microtubule polymerization via Bcl-2 and PI3K/Akt pathways, offering a novel therapeutic strategy.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Beta-Sitosterol (SITO) is a phytosterol with potential anticancer properties.
  • The specific molecular mechanisms underlying SITO's anti-leukemia effects are largely unknown.

Purpose of the Study:

  • To elucidate the cellular and molecular mechanisms of SITO-induced anti-proliferation in human leukemia cells.
  • To investigate the role of Bcl-2 and PI3K/Akt signaling pathways in SITO's effects.

Main Methods:

  • Treatment of U937, HL60, and K562 leukemia cell lines with SITO.
  • Analysis of caspase-3 activation, DNA fragmentation, cell cycle arrest, and endoreduplication.
  • Assessment of alpha-tubulin polymerization and signaling pathway activation (Bcl-2, PI3K/Akt, ERK).

Main Results:

  • SITO induced caspase-3 activation, DNA fragmentation, G2/M arrest, and endoreduplication in leukemia cells.
  • SITO promoted microtubule polymerization and increased Bcl-2 and PI3K/Akt phosphorylation.
  • Bcl-2 and PI3K/Akt pathways were crucial for SITO-induced endoreduplication and apoptosis.

Conclusions:

  • SITO exerts anti-leukemia effects by promoting endoreduplication and apoptosis.
  • These effects are mediated by enhanced spindle microtubule dynamics through the Bcl-2 and PI3K/Akt signaling pathways.

More Related Videos

Utilizing Functional Genomics Screening to Identify Potentially Novel Drug Targets in Cancer Cell Spheroid Cultures07:48

Utilizing Functional Genomics Screening to Identify Potentially Novel Drug Targets in Cancer Cell Spheroid Cultures

Published on: December 26, 2016

Exploring the Pharmacological Action and Molecular Mechanism of Salidroside in Inhibiting MCF-7 Cell Proliferation and Migration11:13

Exploring the Pharmacological Action and Molecular Mechanism of Salidroside in Inhibiting MCF-7 Cell Proliferation and Migration

Published on: June 9, 2023

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...
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.
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...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...