Which signaling pathway is activated by interferons?

Which signaling pathway is activated by interferons?

Interferons (IFNs) encode a large family of multifonctional secreted proteins that are involved in antiviral defense, the regulation of cell growth and modulation of the immune response. They are subdivided into two types that activate transduction pathways via different cell surface receptors.

What is the interferon pathway?

The interferon (IFN) pathway plays a critical role in the human immune response. One of the many responses to the viral invasion is the induction of the pleiotropic cytokines, interferon (IFN). Induction of IFN gene expression leads to increased cellular resistance to viral infection and may also affect cell growth.

What is the STAT3 pathway?

STAT3 signaling is a major intrinsic pathway for cancer inflammation because it is often activated in tumor-associated immune and inflammatory cells as well as malignant cells and is capable of inducing a large number of genes that are crucial for inflammation including IL-6, 10, 11, 17, 23, CXCL12, and COX-2 [127].

How is STAT1 activated?

STAT1 is activated by IFNs and other cell signals. Following activation, STAT1 is translocated to the nuclei and activates transcription of IFN-stimulated genes.

What is the type 1 interferon pathway?

All type I interferons (IFNs) bind a common receptor at the surface of human cells, which is known as the type I IFN receptor. The type I IFN receptor is composed of two subunits, IFNAR1 and IFNAR2, which are associated with the Janus activated kinases (JAKs) tyrosine kinase 2 (TYK2) and JAK1, respectively.

What secretes interferon alpha?

IFN-alpha 1 is secreted by immune (lymphocytes, NK cells, B-cells and T-cells, macrophages) and non-immune cells (fibroblasts, endothelial cells, osteoblasts and others) in answer to a viral infection.

What is the function of interferon beta?

Interferon beta-1a is in a class of medications called immunomodulators. It works by decreasing inflammation and preventing nerve damage that may cause symptoms of multiple sclerosis.

Is STAT1 an ISG?

STAT1 has a key role in many gene expressions that cause survival of the cell, viability or pathogen response. In either case, binding of the promoter element leads to an increased expression of ISG (Interferon-Stimulated Genes). Expression of STAT1 can be induced with diallyl disulfide, a compound in garlic.

What is a STAT3 inhibitor?

Specific STAT3 direct inhibitors consist of SH2 ligands, including G quartet oligodeoxynucleotides (ODN) and small molecules, they induce cell death in tumor cells in which STAT3 is activated. STAT3 can also be inhibited by decoy ODNs (dODN), which bind STAT3 and induce cell death.

How is STAT1 regulated?

Multiple mechanisms are involved in down regulating Stat1-dependent signaling. The receptor-associated protein tyrosine phosphatases Shp1 and Shp2 participate in the negative regulation of Jak-Stat1 signaling by inactivating the IFN receptors and Jaks through dephosphorylation (David et al., 1993; Haque et al., 1997).

What controls STAT1 expression?

In normal human cells treated with interferons (IFNs), the concentration of tyrosine-phosphorylated STAT1 (YP-STAT1), which drives the expression of a large number of genes, increases quickly but then decreases over a period of several hours.

What are type 1 and type 2 interferons?

Expression of type I and III IFNs can be induced in virtually all cell types upon recognition of viral components, especially nucleic acids, by cytoplasmic and endosomal receptors, whereas type II interferon is induced by cytokines such as IL-12, and its expression is restricted to immune cells such as T cells and NK …