Related Experiment Videos

Decreased expression of tumour suppressor Bax-interacting factor-1 (Bif-1), a Bax activator, in gastric carcinomas

Jong Woo Lee1, Eun Goo Jeong, Young Hwa Soung

  • 1Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, Korea.

Pathology
|August 19, 2006
PubMed
Abstract

Insights

Reduced expression of Bax-interacting factor-1 (Bif-1) in gastric cancer cells may promote tumor development. Bif-1 normally enhances apoptosis, and its loss in gastric tumors suggests a role in tumorigenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Death Research

Background:

  • Apoptosis evasion is a key feature of cancer.
  • Bax-interacting factor-1 (Bif-1) promotes apoptosis by interacting with Bax and Bak.
  • Altered Bif-1 expression is investigated as a potential characteristic of gastric cancer.

Purpose of the Study:

  • To investigate the expression levels of Bif-1 in gastric adenocarcinomas.
  • To determine if Bif-1 expression changes are associated with gastric cancer development.

Main Methods:

  • Immunohistochemistry was used to analyze Bif-1 protein expression.
  • Tissue microarrays of 60 gastric adenocarcinomas were examined.

Main Results:

  • Normal gastric mucosal cells showed strong Bif-1 expression.
  • Bif-1 expression was detected in 40% of gastric carcinomas.
  • A significant portion of positive cases exhibited reduced Bif-1 intensity compared to normal cells.

Conclusions:

  • Decreased Bif-1 expression in gastric cancer suggests a role in tumorigenesis.
  • Loss of Bif-1 may inhibit apoptosis, contributing to cancer progression.

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...
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...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...