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1

Evidence for existing the Na - H exchanger in porcine blood platelets

100%
Tomasiak M.
Applied Biology Communications. Lublin Scientific Center
|
1992
|
tom 02
|
nr 1
2

Effect of rise in intracellular Na and-or cytosolic alkalinization on the aggregation of porcine blood platelets

86%
Tomasiak M.
Applied Biology Communications. Lublin Scientific Center
|
1992
|
tom 02
|
nr 6-7
3

Protein kinase c-mediated activation of Na - H exchanger in porcine blood platelets

86%
Tomasiak M.
Applied Biology Communications. Lublin Scientific Center
|
1992
|
tom 02
|
nr 3
4

The role of Naplus-Hplus exchanger in serotonin secretion from porcine blood platelets

86%
Tomasiak M., Ciborowski M., Stelmach H.
Acta Biochimica Polonica
|
2005
|
tom 52
|
nr 4
This study was undertaken to evaluate whether a link exists between the activation of protein kinase C (PKC), operation of Na+/H+ exchanger (NHE), cell swelling and serotonin (5-HT) secretion in porcine platelets. Activation of platelets by thrombin or phorbol 12-myristate 13-acetate (PMA), a PKC activator, initiated a rapid rise in the activity of Na+/H+ exchanger and secretion of 5-HT. Both thrombin- and PMA-evoked activation of Na+/H+ exchanger was less pronounced in the presence of ethyl-isopropyl-amiloride (EIPA), an NHE inhibitor, and by GF 109203X, a PKC inhibitor. Monensin (simulating the action of NHE) caused a dose-dependent release of 5-HT that was not abolished by GF 109203X or EGTA. Lack of Na+ in the suspending medium reduced thrombin-, PMA-, and monensin-evoked 5-HT secretion. GF 109203X nearly completely inhibited 5-HT release induced by PMA-, partly that induced by thrombin, and had no effect on 5-HT release induced by monensin. EIPA partly inhibited 5-HT release induced by thrombin and nearly totally that evoked by PMA. Electronic cell sizing measurements showed an increase in mean platelet volume upon treatment of cells with monensin, PMA or thrombin. The PMA- and thrombin-evoked rise in mean platelet volume was strongly reduced in the presence of EIPA. As judged by optical swelling assay monensin and PMA produced a rapid rise in platelet volume. The swelling elicited by PMA was inhibited by EIPA and its kinetics was similar to that observed in the presence of monensin. Hypoosmotically evoked platelet swelling did not affect platelet aggregation but significantly potentiated thrombin-evoked release of 5-HT and ATP. Taken together, these results show that in porcine platelets PKC may promote 5-HT secretion through the activation of NHE. It is hypothesized that enhanced Na+/H+ antiport may result in a rise in cell membrane tension (due to cell swelling) which in turn facilitates fusion of secretory granules with the plasma membrane leading to 5-HT secretion.
5

Relationship between intracellular pH and aggregation in porcine blood platelets

86%
Tomasiak M.
Applied Biology Communications. Lublin Scientific Center
|
1992
|
tom 02
|
nr 2
6

The influence of porcine blood by-products on laying hen performance, egg quality, and yolk mineral content

58%
Orda J., Jamroz D., Wiliczkiewicz A., Skorupinska J., Kubizna J. K.
Journal of Animal and Feed Sciences
|
2012
|
tom 21
|
nr 1
Isa Brown hens were divided into five groups, each with 12 replications, i.e. cages with 3 birds each. The isoprotein and isoenergetic diets (about 160 g crude protein and 11.3 MJ ME/kg) differed in their contents of spray-dried porcine blood plasma (SDBP) or spray-dried blood cells (SDBC), which amounted to 2 or 4%. Control birds were fed a diet containing plant proteins only. Laying performance and egg quality parameters were recorded during three periods of laying: between 2-10 weeks (57 days), 11-18 weeks (62 days), and between 19-24 weeks of life (62 days) to determine the effect of blood by-products during different laying phases. The young hens from the experimental groups produced significantly fewer eggs (P<0.05) in comparison with control birds. During successive periods, the differences in the performance indices among groups due to type of animal meal or its level were insignificant. Only the laying phase influenced the analysed performance parameters (P<0.01). A significantly higher egg weight was obtained in older hens. In relation to egg shell weight, thickness, and share in total egg weight, significant differences were recorded only in younger hens. Reduced shell weight and share were noted in eggs from hens fed diets with animal meals (P<0.01) as compared with eggs from control birds. It can be said that the use of blood cell meal (2 or 4%) negatively (P<0.01) influenced egg shell indices and yolk colour as compared with control or SDBP groups. Other parameters were not affected. Inclusion of SDBC enhanced the deposition of Mg and Mn (P<0.01) in egg yolk. No clear justification was found for the use of spray-dried blood by-products as an alternative amino acid and mineral source in laying hen diets.
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