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pyrularia pubera/phospholipase
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11 resultados
Cellular responses to Pyrularia thionin are mediated by Ca2+ influx and phospholipase A2 activation and are inhibited by thionin tyrosine iodination.
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Pyrularia thionin, isolated from nuts of Pyrularia pubera, is a strongly basic peptide of 47 amino acids. The amino acid sequence and configuration of its four disulfide bonds place this plant peptide, known to be hemolytic, cytotoxic, and neurotoxic, among the thionins. We report and compare
Phospholipase activation in the cytotoxic mechanism of thionin purified from nuts of Pyrularia pubera.
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Treating NIH3T3 fibroblast cells with Pyrularia pubera thionin (100 micrograms/ml) stimulated release of labelled free fatty acids from phospholipids biosynthetically labelled by incorporation of [3H]arachidonic acid. Since Pyrularia thionin exhibited no detectable phospholipase activity, it was
Pyrularia thionin increases arachidonate liberation and prolactin and growth hormone release from anterior pituitary cells.
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Pyrularia thionin is a 47 amino acid peptide isolated from the nuts of Pyrularia pubera. This peptide does not have intrinsic phospholipase A2 activity, but it increases the liberation of arachidonate from several tissues. Exposure of anterior pituitary cells to this toxin increases the liberation
Action of a thionin isolated from nuts of Pyrularia pubera on human erythrocytes.
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Pyrularia thionin is a strongly basic peptide of 47 amino acids isolated from Pyrularia pubera. This peptide, a member of the thionin family, is hemolytic, cytotoxic and neurotoxic. The characteristics of the hemolytic activity on human erythrocytes are as follows: (1) the peptide does not itself
Effects of different antagonists on depolarization of cultured chick myotubes by cobra venom cardiotoxins and Pyrularia thionin from the plant Pyrularia pubera.
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Cardiotoxins (3.12 and 3.12.1) purified from cobra venom (Naja naja siamensis) are basic single-chain polypeptides of about 60 residues. Although they depolarize nerve and muscle cells and have cytolytic effects, their mechanism of action is still unknown. Pyrularia thionin (P-thionin) isolated from
Hemolytic activity of thionin from Pyrularia pubera nuts and snake venom toxins of Naja naja species: Pyrularia thionin and snake venom cardiotoxin compete for the same membrane site.
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Pyrularia thionin (P. thionin) is a strongly basic peptide of 47 amino acids which is hemolytic, cytotoxic and neurotoxic. It shows the greatest hemolytic activity toward human erythrocytes. Rabbit, guinea pig and pig erythrocytes show decreasing activity in that order, and little or no activity is
Effect of calcium and phosphate ions on hemolysis induced by Pyrularia thionin and Naja naja kaouthia cardiotoxin.
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Pyrularia thionin is a strongly basic bioactive peptide of 47 amino acids isolated from nuts of Pyrularia pubera. It is hemolytic, cytotoxic and activates an endogenous phospholipase A2 in 3T3 cells. Earlier studies have shown that the cardiotoxin from Naja naja kaouthia has similar activities and
Residual bodies activate Sertoli cell interleukin-1 alpha (IL-1 alpha) release, which triggers IL-6 production by an autocrine mechanism, through the lipoxygenase pathway.
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Interleukin-1 (IL-1) and IL-6 are produced by Sertoli cells. As IL-1 stimulates IL-6 production in some tissues, the cascade of events that results in IL-6 secretion by Sertoli cells was studied. The addition of IL-1 alpha to Sertoli cells resulted in a time-dependent increase in IL-6 secretion.
Binding properties of Pyrularia thionin and Naja naja kaouthia cardiotoxin to human and animal erythrocytes and to murine P388 cells.
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Pyrularia thionin and snake venom cardiotoxin are strongly basic peptides which induce hemolysis, depolarization of muscle cells and activation of endogenous phospholipase A2. An earlier study of the hemolysis reaction indicated that the two peptides bind to and compete for the same site on human
Pyrularia thionin binding to and the role of tryptophan-8 in the enhancement of phosphatidylserine domains in erythrocyte membranes.
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Pyrularia thionin is a small, strongly basic peptide which interacts readily with cellular and synthetic membranes. With cells it induces hemolysis, depolarizes the cellular membrane with an accompanying influx of Ca2+, and activates an endogenous phospholipase A2. Evidence points toward a binding
Induction of interleukin-6 release by interleukin-1 in rat anterior pituitary cells in vitro: evidence for an eicosanoid-dependent mechanism.
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We have reported previously that a subpopulation(s) of anterior pituitary cells released IL-6 and that this release was stimulated by interleukin-1 (IL-1) through a non-cAMP-dependent mechanism. We now report that IL-1 induces IL-6 release from anterior pituitary cells in an eicosanoid-dependent
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