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The Effects of N-Terminal Fragments of Immunophilin on Phospholipid Composition of Rat Brain and Human Erythrocyte Membranes

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Abstract

Rat brain slices and human erythrocyte membranes have been incubated in the presence of water-soluble synthetic peptide fragments corresponding to residues 1–9 and 1–15 of the N-terminus of immunophilin and the effects on the phospholipid composition examined. During a 2 h incubation in the presence of 1 nM, 0.1 μM, and 10 μM concentrations of the peptides there were observed significant and dose-dependent decreases in the amounts of phosphatidylcholine and phosphatidylethanolamine, as well as increases in the amounts of phosphatidylserine and, to a less extent, phosphatidylinositol, cardiolipin and lysophosphatidylcholine. The overall decrease in the neutral phospholipids of rat brain, and no changes in human erythrocyte membranes with the simultaneous increase in the acidic phospholipids, both in brain and erythrocyte membranes, tended to counteract any changes in the phospholipid composition of the material studied. The results are discussed in terms of the possible effects of immunophilin on modulating phospholipid turnover in brain cell erythrocyte membranes.

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  1. Institute of Molecular Biology, NAS RA, 7 Hasratian str., Yerevan, 375014, The Republic of Armenia. Phone:

    Konstantine G. Karageuzyan

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  1. Konstantine G. Karageuzyan
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Karageuzyan, K.G. The Effects of N-Terminal Fragments of Immunophilin on Phospholipid Composition of Rat Brain and Human Erythrocyte Membranes. Neurochem Res 24, 1161–1167 (1999). https://doi.org/10.1023/A:1020768605370

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