Related Experiment Video

Updated: Aug 8, 2026

Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c
07:42

Activation of Apoptosis by Cytoplasmic Microinjection of Cytochrome c

Published on: June 29, 2011

Betulinic acid induces apoptosis through a direct effect on mitochondria in neuroectodermal tumors

S Fulda1, K M Debatin

  • 1University Children's Hospital, Ulm, Germany.

Medical and Pediatric Oncology
|December 7, 2000
PubMed
Abstract

Insights

BetA is a novel cytotoxic agent effective against childhood neuroectodermal tumors like neuroblastoma. It triggers apoptosis via mitochondrial pathways, showing promise for treating these aggressive cancers.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Neuroectodermal tumors are the most common childhood solid tumors.
  • Effective treatments for these aggressive cancers remain a challenge.

Purpose of the Study:

  • To identify and characterize novel cytotoxic agents for neuroectodermal tumors.
  • To investigate the mechanism of action of the identified agent, BetA.

Main Methods:

  • In vitro screening of cytotoxic agents against neuroectodermal tumor cell lines.
  • Apoptosis assays to determine the mechanism of cell death induced by BetA.
  • Mitochondrial function and caspase activation studies.

Main Results:

  • BetA demonstrated potent cytotoxicity against neuroblastoma, medulloblastoma, glioblastoma, and Ewing sarcoma cells.
  • BetA induced apoptosis through direct mitochondrial damage, releasing cytochrome c and AIF, independent of p53 or CD95.
  • Overexpression of Bcl-2 or Bcl-X(L) conferred resistance, indicating mitochondrial pathway involvement.
  • BetA showed significant antitumor activity against drug-resistant neuroblastoma and primary patient-derived neuroectodermal tumors.

Conclusions:

  • BetA represents a promising new therapeutic agent for neuroectodermal tumors.
  • Its efficacy against resistant cell types and primary tumors warrants further investigation in vivo.

More Related Videos

Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen19:44

Enhancement of Apoptotic and Autophagic Induction by a Novel Synthetic C-1 Analogue of 7-deoxypancratistatin in Human Breast Adenocarcinoma and Neuroblastoma Cells with Tamoxifen

Published on: May 30, 2012

Establishing Cell Lines Overexpressing DR3 to Assess the Apoptotic Response to Anti-mitotic Therapeutics12:28

Establishing Cell Lines Overexpressing DR3 to Assess the Apoptotic Response to Anti-mitotic Therapeutics

Published on: January 11, 2019

Related Concept Videos

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...
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...
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...