Related Experiment Video

Updated: Jun 19, 2026

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
19:44

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

Hint2, a mitochondrial apoptotic sensitizer down-regulated in hepatocellular carcinoma

Juliette Martin1, Fabrice Magnino, Karin Schmidt

  • 1Institute for Clinical Pharmacology, University of Bern, Bern, Switzerland.

Gastroenterology
|June 10, 2006
PubMed
Abstract

Insights

Human Hint2, a mitochondrial protein, promotes apoptosis and suppresses tumor growth. Its downregulation in hepatocellular carcinoma suggests a role in cancer progression and poor survival.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Histidine triad nucleotide-binding proteins (Hints) are enzymes with unclear biological roles.
  • Human Hint2 is characterized as an adenosine monophosphate-lysine hydrolase.

Purpose of the Study:

  • To characterize the function and biological role of human Hint2.
  • To investigate Hint2's involvement in apoptosis and cancer.

Main Methods:

  • Real-time quantitative PCR, immunoblotting, and immunocytochemistry for tissue distribution and localization.
  • Enzymatic activity assays, cell line manipulation (overexpression/knockdown), and apoptosis assessment.
  • In vivo tumor growth studies in SCID mice and microarray analysis of human tumors.

Main Results:

  • Hint2 is primarily expressed in the liver and pancreas and localized to mitochondria.
  • Overexpression of Hint2 enhanced apoptosis and reduced tumor growth in vivo.
  • HINT2 messenger RNA was downregulated in hepatocellular carcinomas, correlating with poor patient survival.

Conclusions:

  • Hint2 acts as a mitochondrial apoptotic sensitizer.
  • Downregulation of Hint2 is implicated in hepatocellular carcinoma development and progression.

More Related Videos

Detection of Mitochondria Membrane Potential to Study CLIC4 Knockdown-induced HN4 Cell Apoptosis In Vitro13:20

Detection of Mitochondria Membrane Potential to Study CLIC4 Knockdown-induced HN4 Cell Apoptosis In Vitro

Published on: July 17, 2018

Drug-Induced Senescence in Liver Cells Promotes M2 Macrophage Polarization: Implications for Tyrosine Kinase Inhibitor-Associated Hepatotoxicity09:32

Drug-Induced Senescence in Liver Cells Promotes M2 Macrophage Polarization: Implications for Tyrosine Kinase Inhibitor-Associated Hepatotoxicity

Published on: October 17, 2025

Related Concept Videos

Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
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...