A B S T R A C r The turnover of the four major erythrocyte phospholipids has been studied with 32P, both in vivo and in vitro, in man and the dog. Phosphatidyl serine and phosphatidyl ethanolamine appeared to be stable erythrocyte lipids in both species. Turnover of the phosphate moiety of lecithin and sphingomyelin in the circulating erythrocytes of these two species seems entirely due to an e...

A membrane lipid abnormality induced by sickling and found as a permanent alteration in the irreversibly sickled cell (ISC) is the rearrangement of phosphatidyl ethanolamine (PE) and phosphatidyl serine (PS) from the inner to the exterior side of the lipid bilayer. Since PS can provide a catalytic surface for the binding of blood coagulation factors and thus can exhibit procoagulant activity, w...

We report a methodology for the isolation of peroxisome membranes from the yeast Candida tropicalis pK233 grown on oleic acid, and the characterization of the polypeptide and lipid compositions of these membranes. Peroxisomes purified in either sucrose or Nycodenz gradients are treated with Tris-HCl (pH 8.5) and then with sodium carbonate (pH 11.5) to yield a final peroxisome membrane preparati...

The asymmetric distribution of the amino-containing phospholipids, phosphatidyl-serine (PS) and phosphatidyl-ethanolamine (PE), across the two leaflets of red blood cell (RBC) membrane is essential to the function and survival of the cell. PS and PE are sequestered in the inner leaflet by an ATP-dependent transport activity of a membrane protein known as the RBC flippase that specifically moves...

Incubation of slices of the salt gland of the albatross with acetylcholine, which is the physiological secretogogue for this tissue, led to a 13-fold increase in the rate of incorporation of P(32) into phosphatidic acid and a 3-fold increase in the incorporation of P(32) and inositol-2-H(3) into phosphoinositide. The incorporation of P(32) into phosphatidyl choline and phosphatidyl ethanolamine...

The surface properties of mixed monomolecular films of retinal and phospholipids (p. lipids) are measured as a function of mole fraction at a nitrogen-water interface. An acid pH of 6.0 is maintained in the aqueous phase. Before irradiation the surface potential deltaV for 9-cis retinal, 11-cis retinal, phosphatidyl serine (PS) and phosphatidyl ethanolamine (PE), at pi=12 dyn/cm, are 490 mV, 64...

The synthesis of lipid by rabbit atherosclerotic intima incubated in vitro has been investigated and compared with that of foam cells isolated from intima] lesions. In the atherosclerotic arterial intima, C-labeled acetate is readily incorporated into the lipid fraction, most of the label being found in the phospholipid and cholesterol ester fatty acid fractions. Minimal incorporation into trig...

In studying the control of thyroidal phosphatide metabolism it was found that osmotic shock could stimulate the z2P incorporation into lipids of surviving thyroid slices. The nature of this effect and its relation to thyrotropin stimulation of phosphatide turnover was examined by first incubating calf thyroid slices in hypotonic or isotonic medium for 15 min and then transferring the slices to ...

Local anesthetics (LA) have been found to interact with phospholipids and lipids extracted from nerve and muscle. This reaction is demonstrated by: (a) Inhibition by LA of phospholipid (and tissue lipid) facilitated transport of calcium from a methanol: water phase into chloroform. This action is dependent upon the cationic form of the LA. (b) LA increase the electrical resistance of "membranes...

The synthesis of two new synthetic analogues of lecithin, two of phosphatidyl ethanolamine ("cephalin"), and one new phosphatidic acid analogue is described. They comprise one of each of the following types: the "isosteric" diether lecithin and cephalin analogues ROCH(2)CH(OR)- CH(2)CH(2)P(O) (O(-))OCH(2)CH(2)N(+)R'(3) (R = C(18)H(37); R' = H or CH(3)); and the "hydrocarbon" analogues of phosph...