Induction of a calcium/calmodulin-dependent phosphodiesterase during phytohemagglutinin-stimulated lymphocyte mitogenesis.

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Induction of a calcium/calmodulin-dependent phosphodiesterase during phytohemagglutinin-stimulated lymphocyte mitogenesis.

A calmodulin (CaM)-dependent phosphodiesterase activity that hydrolyzes both cGMP and cAMP was observed in anion exchange high performance liquid chromatography (HPLC) profiles from phytohemagglutinin-stimulated mononuclear cells but not in profiles from unstimulated cells. A single polypeptide was detected by an antibody to the calmodulin-dependent phosphodiesterases on a Western blot of homog...

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Inhibition of phytohemagglutinin-induced lymphocyte mitogenesis by lipoxygenase metabolites of arachidonic acid: structure-activity relationships.

Phytohemagglutinin (PHA)-induced mitogenesis of mixed mouse spleen lymphocyte populations, measured by [3H]thymidine incorporation, was completely inhibited by micromolar concentrations of certain hydroxyeicosatetraenoic acids (HETE's). These are lipoxygenase metabolites of arachidonic acid which are synthesized in considerable concentrations by macrophages, lymphocytes, and other components of...

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A method for counting phytohemagglutinin-stimulated lymphocytes.

I T HAS BEEN SHOWN that peripheral i)lood lynlphocvtes undergo trainsformation and mitosis in vitro when cultured in the presence of plwtohemagglutinin ( PHA).’4 Little information has been reported on the numl)er of lymphocytes which survive and transform during the culturing interval. It has been very difficult to enumerate lymphocytes in cultures containing PFIA I)ecause the agglutinated ery...

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Purification and some characteristics of human T-cell growth factor from phytohemagglutinin-stimulated lymphocyte-conditioned media.

Human T-cell growth factor (TCGF), a mitogenic protein that appears in the media of cultured lymphocytes after phytohemagglutinin-stimulation, has been purified more than 400-fold from serum-free conditioned media by using a sequence of ion exchange chromatography and gel filtration. The purified growth factor elutes as a broad peak from DEAE-Sepharose, focuses diffusely at a pH of about 6.8 on...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 1990

ISSN: 0021-9258

DOI: 10.1016/s0021-9258(19)38973-2