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LYN
Tyrosine-protein kinase Lyn is a protein that in humans is encoded by the LYN gene.
Lyn is a member of the Src family of protein tyrosine kinases, which is mainly expressed in hematopoietic cells, in neural tissues liver, and adipose tissue. In various hematopoietic cells, Lyn has emerged as a key enzyme involved in the regulation of cell activation. In these cells, a small amount of LYN is associated with cell surface receptor proteins, including the B cell antigen receptor (BCR), CD40, or CD19. The abbreviation Lyn is derived from Lck/Yes novel tyrosine kinase, Lck and Yes also being members of the Src kinase family.
Lyn has been described to have an inhibitory role in myeloid lineage proliferation. Following engagement of the B cell receptors, Lyn undergoes rapid phosphorylation and activation. This activation initiates a cascade of signaling events mediated by Lyn phosphorylation of tyrosine residues within the immunoreceptor tyrosine-based activation motifs (ITAMs) of receptor proteins. This cascade leads to the recruitment and activation of other kinases, including Syk, phospholipase Cγ2 (PLCγ2), and phosphatidyl inositol-3 kinase. These kinases generate activation signals critical for proliferation, Ca2+ mobilization, and cell differentiation.
Lyn also plays an essential role in transmitting inhibitory signals by phosphorylating tyrosine residues within the immunoreceptor tyrosine-based inhibitory motifs (ITIMs) of regulatory proteins such as CD22, PIR-B, and FCγRIIb1. ITIM phosphorylation subsequently recruits and activates phosphatases including SHIP-1 and SHP-1, leading to the attenuation of signaling pathways, downregulation of cell activation, and promotion of tolerance. In B cells, Lyn sets the threshold of signaling and maintains the balance between activation and inhibition, effectively functioning as a rheostat rather than a binary switch.
LYN is reported to be a key mediator of estrogen-dependent suppression of human osteoclast differentiation, survival, and function. It has also been implicated in the insulin signaling pathway, where activated Lyn phosphorylates insulin receptor substrate 1 (IRS1), promoting Glut-4 translocation to the membrane and enhancing glucose utilization. Insulin receptor activation has been shown to increase Lyn autophosphorylation, suggesting a feedback loop.
Lyn has been shown to protect against hepatocellular apoptosis and promote liver regeneration by preserving mitochondrial integrity.
In pulmonary function, Lyn activation in pulmonary epithelium has been linked to improved barrier integrity and reduced edema. Lyn activation in alveolar phagocytes enhances bacterial phagocytosis and reduces pulmonary infections. Furthermore, Lyn activation has been shown to reduce pulmonary mucus hypersecretion.
HSP90 inhibitor NVP-BEP800 has been reported to affect Lyn kinase stability and inhibit the growth of B-cell acute lymphoblastic leukemias by interfering with NF-kappaB signaling.
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LYN
Tyrosine-protein kinase Lyn is a protein that in humans is encoded by the LYN gene.
Lyn is a member of the Src family of protein tyrosine kinases, which is mainly expressed in hematopoietic cells, in neural tissues liver, and adipose tissue. In various hematopoietic cells, Lyn has emerged as a key enzyme involved in the regulation of cell activation. In these cells, a small amount of LYN is associated with cell surface receptor proteins, including the B cell antigen receptor (BCR), CD40, or CD19. The abbreviation Lyn is derived from Lck/Yes novel tyrosine kinase, Lck and Yes also being members of the Src kinase family.
Lyn has been described to have an inhibitory role in myeloid lineage proliferation. Following engagement of the B cell receptors, Lyn undergoes rapid phosphorylation and activation. This activation initiates a cascade of signaling events mediated by Lyn phosphorylation of tyrosine residues within the immunoreceptor tyrosine-based activation motifs (ITAMs) of receptor proteins. This cascade leads to the recruitment and activation of other kinases, including Syk, phospholipase Cγ2 (PLCγ2), and phosphatidyl inositol-3 kinase. These kinases generate activation signals critical for proliferation, Ca2+ mobilization, and cell differentiation.
Lyn also plays an essential role in transmitting inhibitory signals by phosphorylating tyrosine residues within the immunoreceptor tyrosine-based inhibitory motifs (ITIMs) of regulatory proteins such as CD22, PIR-B, and FCγRIIb1. ITIM phosphorylation subsequently recruits and activates phosphatases including SHIP-1 and SHP-1, leading to the attenuation of signaling pathways, downregulation of cell activation, and promotion of tolerance. In B cells, Lyn sets the threshold of signaling and maintains the balance between activation and inhibition, effectively functioning as a rheostat rather than a binary switch.
LYN is reported to be a key mediator of estrogen-dependent suppression of human osteoclast differentiation, survival, and function. It has also been implicated in the insulin signaling pathway, where activated Lyn phosphorylates insulin receptor substrate 1 (IRS1), promoting Glut-4 translocation to the membrane and enhancing glucose utilization. Insulin receptor activation has been shown to increase Lyn autophosphorylation, suggesting a feedback loop.
Lyn has been shown to protect against hepatocellular apoptosis and promote liver regeneration by preserving mitochondrial integrity.
In pulmonary function, Lyn activation in pulmonary epithelium has been linked to improved barrier integrity and reduced edema. Lyn activation in alveolar phagocytes enhances bacterial phagocytosis and reduces pulmonary infections. Furthermore, Lyn activation has been shown to reduce pulmonary mucus hypersecretion.
HSP90 inhibitor NVP-BEP800 has been reported to affect Lyn kinase stability and inhibit the growth of B-cell acute lymphoblastic leukemias by interfering with NF-kappaB signaling.