Page last updated: 2024-10-24

negative regulation of activated CD8-positive, alpha-beta T cell apoptotic process

Definition

Target type: biologicalprocess

Any process that stops, prevents or reduces the frequency, rate or extent of activated CD8-positive, alpha-beta T cell apoptotic process. [GO_REF:0000058, GOC:TermGenie, PMID:24187568]

Negative regulation of activated CD8-positive, alpha-beta T cell apoptotic process involves a complex interplay of signaling pathways and molecular mechanisms that prevent the premature or inappropriate death of these crucial immune cells. CD8-positive, alpha-beta T cells are cytotoxic lymphocytes that play a vital role in the adaptive immune response, targeting and eliminating infected or cancerous cells. Activation of these T cells, triggered by antigen presentation through MHC class I molecules, initiates a signaling cascade that ultimately leads to the production of effector molecules like granzyme and perforin, which induce target cell death. However, excessive or uncontrolled apoptosis of these cells can impair immune function and lead to immunodeficiency.

To prevent premature apoptosis, activated CD8-positive, alpha-beta T cells employ a variety of regulatory mechanisms. These include:

* **Anti-apoptotic signaling pathways:** Activation of survival pathways like the PI3K/Akt and NF-κB pathways promotes cell survival by inhibiting pro-apoptotic proteins and promoting the expression of anti-apoptotic proteins like Bcl-2 and Bcl-xL.
* **Immune checkpoint molecules:** Expression of inhibitory receptors like CTLA-4 and PD-1 on activated T cells allows them to downregulate their activation state and prevent excessive apoptosis. Engagement of these receptors with their ligands on antigen-presenting cells sends negative signals that suppress T cell activation and proliferation.
* **Cytokine signaling:** Cytokines like IL-2 and IL-7 play a crucial role in maintaining T cell survival. These cytokines activate signaling pathways that promote cell growth, proliferation, and survival.
* **Metabolic adaptation:** Activated T cells undergo significant metabolic changes to meet their increased energy demands. These changes include the upregulation of glycolysis and the production of metabolites that contribute to cell survival.
* **Microenvironment interactions:** Interactions with other cells in the immune microenvironment, such as antigen-presenting cells and regulatory T cells, can influence the survival of activated CD8-positive, alpha-beta T cells.

The precise mechanisms involved in the negative regulation of activated CD8-positive, alpha-beta T cell apoptosis are still being elucidated. However, it is clear that a delicate balance between pro- and anti-apoptotic signals is crucial for maintaining a healthy pool of these effector cells and ensuring an effective immune response.'
"

Proteins (2)

ProteinDefinitionTaxonomy
CMP-N-acetylneuraminate-beta-galactosamide-alpha-2,3-sialyltransferase 1A CMP-N-acetylneuraminate-beta-galactosamide-alpha-2,3-sialyltransferase 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q11201]Homo sapiens (human)
Arginase-2, mitochondrialAn arginase-2, mitochondrial that is encoded in the genome of human. [PRO:DNx, UniProtKB:P78540]Homo sapiens (human)

Compounds (15)

CompoundDefinitionClassesRoles
2,3-dihydroxybenzoic acid2,3-dihydroxybenzoic acid : A dihydroxybenzoic acid that is benzoic acid substituted by hydroxy groups at positions 2 and 3. It occurs naturally in Phyllanthus acidus and in the aquatic fern Salvinia molesta.

2,3-dihydroxybenzoic acid: RN given refers to parent cpd

dihydroxybenzoic acid : Any member of the class of hydroxybenzoic acids carrying two phenolic hydroxy groups on the benzene ring and its derivatives.
dihydroxybenzoic acidhuman xenobiotic metabolite;
plant metabolite
protocatechuic acid3,4-dihydroxybenzoic acid : A dihydroxybenzoic acid in which the hydroxy groups are located at positions 3 and 4.

protocatechuic acid: RN given refers to parent cpd; structure
catechols;
dihydroxybenzoic acid
antineoplastic agent;
EC 1.1.1.25 (shikimate dehydrogenase) inhibitor;
EC 1.14.11.2 (procollagen-proline dioxygenase) inhibitor;
human xenobiotic metabolite;
plant metabolite
gallic acidgallate : A trihydroxybenzoate that is the conjugate base of gallic acid.trihydroxybenzoic acidantineoplastic agent;
antioxidant;
apoptosis inducer;
astringent;
cyclooxygenase 2 inhibitor;
EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor;
geroprotector;
human xenobiotic metabolite;
plant metabolite
beta-resorcylic acidbeta-resorcylic acid: RN given refers to parent cpd; structure
2,5-dihydroxybenzoic acid2,5-dihydroxybenzoic acid : A dihydroxybenzoic acid having the two hydroxy groups at the 2- and 5-positions.

2,5-dihydroxybenzoic acid: RN given refers to parent cpd; a oxidative product of saligenin
dihydroxybenzoic acidEC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor;
fungal metabolite;
human metabolite;
MALDI matrix material;
mouse metabolite
veratric acid3,4-dimethoxybenzoic acid : A member of the class of benzoic acids that is benzoic acid substituted by methoxy groups at positions 2 and 3.

veratric acid: RN given refers to parent cpd; structure
benzoic acidsallergen;
plant metabolite
methyl gallatemethyl 3,4,5-trihydroxybenzoate : A gallate ester obtained by the formal condensation of gallic acid with methanol. It exhibits anti-oxidant, anti-tumor, anti-microbial and anti-inflammatory properties.

methyl gallate: has both immunosuppressive and phytogenic antineoplastic activities; isolated from Acer saccharinum
gallate esteranti-inflammatory agent;
antioxidant;
plant metabolite
3,4,5-trimethoxybenzoic acid3,4,5-trimethoxybenzoic acid : A benzoic acid derivative carrying 3-, 4- and 5-methoxy substituents.

3,4,5-trimethoxybenzoic acid: RN given refers to parent cpd; structure
benzoic acids;
methoxybenzenes
human urinary metabolite;
human xenobiotic metabolite;
plant metabolite
syringic acidsyringic acid : A dimethoxybenzene that is 3,5-dimethyl ether derivative of gallic acid.

syringic acid: RN given refers to parent cpd; structure in third source
benzoic acids;
dimethoxybenzene;
phenols
plant metabolite
epigallocatechin gallate(-)-epigallocatechin 3-gallate : A gallate ester obtained by the formal condensation of gallic acid with the (3R)-hydroxy group of (-)-epigallocatechin.

epigallocatechin gallate: a steroid 5alpha-reductase inhibitor and antimutagen in green tea (Camellia sinensis)
flavans;
gallate ester;
polyphenol
antineoplastic agent;
antioxidant;
apoptosis inducer;
geroprotector;
Hsp90 inhibitor;
neuroprotective agent;
plant metabolite
n(omega)-hydroxyarginineN(5)-[(Z)-amino(hydroxyimino)methyl]-L-ornithine : An N(5)-[amino(hydroxyimino)methyl]-L-ornithine in which the double bond has Z-configuration.

N(omega)-hydroxyarginine: can cause vasorelaxation of bovine intrapulmonary artery; structure given in first source
amino acid zwitterion;
N(5)-[(E)-amino(hydroxyimino)methyl]ornithine;
N(5)-[(hydroxyamino)(imino)methyl]ornithine;
N(5)-[(Z)-amino(hydroxyimino)methyl]ornithine;
N(5)-[amino(hydroxyimino)methyl]-L-ornithine;
N(5)-[amino(hydroxyimino)methyl]ornithine;
N(omega)-hydroxy-L-arginine
Nomega-hydroxy-nor-l-arginineL-alpha-amino acid
(S)-2-amino-6-boronohexanoic acid(S)-2-amino-6-boronohexanoic acid : L-Norleucine substituted at C-6 with a borono group.non-proteinogenic L-alpha-amino acid;
organoboron compound
2-amino-6-boronohexanoic acid
guanosine diphosphateGuanosine Diphosphate: A guanine nucleotide containing two phosphate groups esterified to the sugar moiety.guanosine 5'-phosphate;
purine ribonucleoside 5'-diphosphate
Escherichia coli metabolite;
mouse metabolite;
uncoupling protein inhibitor