Human basophils activated through high-affinity immunoglobulin E (IgE) receptors (Fc epsilon RI) are involved in the late phase of the allergic reaction. To investigate the possible involvement of protein-tyrosine kinases in this activation we used human acute basophilic leukemia (ABL) cells in culture as well as a pure population of normal basophils in vitro-derived from human bone marrow prec...

The mRNA endonuclease PMR1 initiates mRNA decay by forming a selective complex with its translating substrate mRNA. Previous work showed that the ability of PMR1 to target to polysomes and activate decay depends on the phosphorylation of a tyrosine residue at position 650. The current study shows that c-Src is responsible for activating this mRNA decay pathway. c-Src was recovered with immunopr...

Cyclic nucleotide-gated (CNG) channels in vertebrate photoreceptors are crucial for transducing light-induced changes in cGMP concentration into electrical signals. In this study, we show that both native and exogenously expressed CNG channels from rods are modulated by tyrosine phosphorylation. The cGMP sensitivity of CNG channels, composed of rod alpha-subunits expressed in Xenopus oocytes, g...

Interspecies communication between Porphyromonas gingivalis and Streptococcus gordonii underlies the development of synergistic dual species communities. Contact with S. gordonii initiates signal transduction within P. gingivalis that is based on protein tyrosine (de)phosphorylation. In this study, we characterize a bacterial tyrosine (BY) kinase (designated Ptk1) of P. gingivalis and demonstra...

This paper describes the O(2)-dependent control of the reactivity of nitrogen oxide species for the production of biologically important nitrated and nitrosated compounds. In this study, the effects of O(2) on the reactivity of NO, NO(2), and ONOO(-)/ONOOH for nitration of tyrosine (Tyr) and nitrosation of glutathione (GSH) and morpholine (MOR) were examined. NO produced S-nitrosoglutathione (G...

background: the secondary genetic changes other than the promyelocytic leukemia-retinoic acid receptor (pml-rara) fusion gene may contribute to the acute promyelocytic leukemogenesis. chromosomal alterations and mutation of flt3 (fms-like tyrosine kinase 3) tyrosine kinase receptor are the frequent genetic alterations in acute myeloid leukemia. however, the prognostic significance of flt3 mutat...

introduction: tyrosine kinase inhibitors (tkis) were the first drugs to use an intracellular signaling molecule as a therapeutic target. unresponsiveness to tkis limits therapeutic options, making allogeneic hematopoietic stem cell transplantation (hsct) the only option leading to molecular remission. objectives: to characterize cml patients unresponsive to first- and/or second-generation tki t...