background: uterine natural killer (unk) cells are the most abundant leukocytes in pre-implantation endometrium and early pregnancy deciduas in humans and rodents. they are associated with structural changes in maternal spiral arteries but regulation of their re-cruitment and activation is incompletely understood. the major subpopulation of unk cells in humans expresses cd56, the neural cell ad...

S-Endo-1 antigen (CD146), a transmembrane receptor also known as MUC18/MCAM, is a member of the immunoglobulin superfamily and belongs to a group of cell adhesion molecules. CD146 is highly expressed on the whole vascular tree. We demonstrate here that engagement of CD146 on human endothelial cells isolated from cord blood results in tyrosine phosphorylation of a large panel of cellular protein...

Thimerosal is one of the most widely used preservatives and has been reported to cause chemically mediated side effects. However, the mechanism of the side effects is not clearly understood yet. In the present study, we showed that HeLa S cells treated by thimerosal generated reactive oxygen species (ROS). Thimerosal-generated ROS stimulated the tyrosine phosphorylation of focal adhesion kinase...

Gastrointestinal (GI) peptides (also referred to as neuropeptides or regulatory peptides), including the mammalian bombesin-like peptides gastrin and CCK, elicit the synthesis of classic second messengers (e.g., Ca2+, diacylglycerol, and cAMP) and the consequent stimulation of serine/threonine protein kinase cascades. An emerging theme in signal transduction is that these agonists also induce r...

mpns including a heterogeneous group of clonal or oligoclonal hamtopathies characterized by proliferation and accumulation of mature myeloid cells. jak2 tyrosine kinase mutation is the most common molecular lesion identified in 90% of cases. jak2 is involved in epo signaling pathway, and mutations in it lead to epo-independent spontaneous phosphorylation. most tyrosine kinase inhibitors (tki) a...

To understand the molecular basis underlying 15(S)-hydroxyeicosatetraenoic acid (15(S)-HETE)-induced angiogenesis, we have studied the role of the Janus kinase-signal transducer and activator of transcription (Jak-STAT) signaling. The 15(S)-HETE stimulated tyrosine phosphorylation of Jak2 in a time-dependent manner in human retinal microvascular endothelial cells (HRMVECs). Inhibition of Jak2 a...

Human protein S is an anticoagulation protein. However, it is unknown whether protein S could regulate the expression and function of macrophage scavenger receptor A (SR-A) in macrophages. Human THP-1 monocytes and peripheral blood monocytes were differentiated into macrophages and then treated with physiological concentrations of human protein S. We found that protein S significantly reduced a...

Trans-cinnamic acid and p-coumaric are valuable intermediates in the synthesis of flavonoids widely employed food, flavor pharmaceutical industries. These products can be produced by deamination L-phenylalanine L-tyrosine catalyzed phenylalanine ammonia lyase or tyrosine lyase. Phenylalanine ammonia-lyase (PAL, EC 4.3.1.5) from Rhodotorula glutinis do not exhibit strong substrate specificity co...

Truncated hemoglobin O (trHbO) is one of two trHbs in Mycobacterium tuberculosis. Remarkably, trHbO possesses two novel distal residues, in addition to the B10 tyrosine, that may be important in ligand binding. These are the CD1 tyrosine and G8 tryptophan. Here we investigate the reactions of trHbO and mutants using stopped-flow spectrometry, flash photolysis, and UV-enhanced resonance Raman sp...

Activation of platelets by different agonists induces rapid tyrosine phosphorylation of a number of proteins by stimulating one or more protein tyrosine kinase (PTKase) [l]. The presence of several members of the src family of PTKases, namely pp60""', pp6OfY", pp61 hc*, ~ ~ 6 2 ~ " and pp54/56Iv", has now been identified in platelets 121. The major PTKase expressed in platelets is pp60"'" which...