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2014 ; 11
(95
): 20131103
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
Influence of platelet-activating factor, lyso-platelet-activating factor and
edelfosine on Langmuir monolayers imitating plasma membranes of cell lines
differing in susceptibility to anti-cancer treatment: the effect of plasmalogen
level
#MMPMID24694892
Flasi?ski M
; H?c-Wydro K
; Wydro P
; Dynarowicz-??tka P
J R Soc Interface
2014[Jun]; 11
(95
): 20131103
PMID24694892
show ga
Three structurally related but differing in biological activities single-chained
ether phospholipids (PAF (platelet-activating factor) and lyso-PAF) and an
anti-cancer drug (edelfosine (ED)) were investigated in Langmuir monolayers
imitating natural membranes. The aim of the undertaken experiments was to study
the influence of these lipids on monolayers mimicking plasma membranes of cell
lines differing in susceptibility to the anti-cancer activity of ED, i.e.
promyelocytic leukaemia cells (HL-60) and promyeloblastic leukaemia cells
(K-562). As these cells differ essentially in the cholesterol/phospholipid ratio
and plasmalogen concentration in the membrane, we have carried out systematic
investigations in artificial systems of various compositions. The results for
model leukaemia cell membrane were compared with data acquired for systems
imitating normal leucocytes. Our results show that the level of plasmalogens
significantly modulates the influence of the single-chained phospholipids on the
investigated systems. The experiments confirmed also that the interactions of
ether lipids with a model membrane of HL-60 cells (in biological tests sensitive
to ED) have opposite character when compared with K-562, being resistant to ED.
Moreover, the values of the parameters characterizing monolayers serving as
membrane models (strength of interactions, monolayers fluidity and morphology)
proved both sensitivity of these cells to ED and lack of their susceptibility
towards PAF. Interestingly, it has been found that lyso-PAF, which is usually
described as an inactive precursor of PAF, displays a stronger effect on HL-60
model membranes than ED.