PMID: 12787933Jun 6, 2003Paper

Temperature dependence of fluid phase endocytosis coincides with membrane properties of pig platelets

Biochimica Et Biophysica Acta
W F WolkersJ H Crowe

Abstract

In previous studies we have shown that platelets take up low molecular weight molecules from the medium by fluid phase endocytosis, a phenomenon that we previously have used to load trehalose into human platelets, after which we have successfully freeze-dried them. We now extend those findings to a species to be used in animal trials of freeze-dried platelets:pigs. Further, we report results of studies aimed at elucidating the mechanism of the uptake. Temperature dependence of fluid-phase endocytosis was determined in pig platelets, using lucifer yellow carbohydrazide (LY) as a marker. A biphasic curve of marker uptake versus temperature was obtained. The activation energy was significantly higher above 22 degrees C (18.7+/-1.8 kcal/mol) than below that critical temperature (7.5+/-1.5 kcal/mol). The activation energy of fluid phase endocytosis in human platelets was 24.1+/-1.6 kcal/mol above 15 degrees C. In order to establish a correlation between the effect of temperature on fluid phase endocytosis and the membrane physical state, Fourier transform infrared spectroscopy (FTIR) and fluorescence anisotropy experiments were conducted. FTIR studies showed that pig platelets exhibit a main membrane phase transition at approximatel...Continue Reading

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Citations

Dec 11, 2008·The Journal of Membrane Biology·C PotrichM Dalla Serra
Oct 17, 2009·The Journal of Biological Chemistry·Chen-Yu JiaoSandrine Sagan
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