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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...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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...
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...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...

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Related Experiment Video

Updated: Jun 24, 2026

Examining BCL-2 Family Function with Large Unilamellar Vesicles
08:35

Examining BCL-2 Family Function with Large Unilamellar Vesicles

Published on: October 5, 2012

Context-dependent Bcl-2/Bak interactions regulate lymphoid cell apoptosis.

Haiming Dai1, X Wei Meng, Sun-Hee Lee

  • 1Division of Oncology Research, Mayo Clinic, Rochester, Minnesota 55905, USA.

The Journal of Biological Chemistry
|April 9, 2009
PubMed
Summary
This summary is machine-generated.

Bcl-2 proteins, crucial for apoptosis regulation, restrain Bak activity. Naturally occurring Bcl-2 variants show high affinity for Bak, impacting cell survival and apoptosis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The intrinsic apoptotic pathway is initiated by cytochrome c release from mitochondria.
  • This release is controlled by interactions between proapoptotic proteins (Bax and Bak) and antiapoptotic Bcl-2 family members.
  • Previous research suggested Mcl-1 and Bcl-x(L), but not Bcl-2, inhibit Bak-induced apoptosis.

Purpose of the Study:

  • To investigate the binding affinities of full-length Bak and its BH3 domain for Bcl-2.
  • To determine the role of naturally occurring Bcl-2 allelic variants in regulating Bak activity.
  • To understand how Bcl-2 variants influence mitochondrial membrane permeabilization and apoptosis.

Main Methods:

  • In vitro binding assays comparing affinities of Bak and its BH3 domain for Bcl-2.
  • Analysis of endogenous levels of Bcl-2 variants in lymphoid cells.
  • Assessment of the ability of Bcl-2 variants to substitute for Mcl-1 in cell protection assays.

Main Results:

  • Full-length Bak exhibits significantly higher affinity for Bcl-2 than its BH3 domain.
  • Certain naturally occurring Bcl-2 variants display high affinity for Bak, comparable to Mcl-1.
  • Endogenous Bcl-2 variants, more abundant than Mcl-1, effectively restrain Bak in intact cells.
  • Bcl-2 variants can substitute for Mcl-1 in protecting cells from apoptosis, depending on their Bak affinity.

Conclusions:

  • Bcl-2's capacity to inhibit Bak-mediated apoptosis is context-dependent.
  • The identity and expression levels of Bcl-2 variants are critical factors in determining cellular protection.
  • This study refines our understanding of the regulatory mechanisms governing the intrinsic apoptotic pathway.