2018, Cilt 48, Sayı 3, Sayfa(lar) 167-172 |
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F-actin Stabilization by Jasplakinolide in Endothelial Cells and Diphtheria Toxin Traffic |
Bilge ÖZERMAN EDİS1, Ebru HACIOSMANOĞLU2, Başak VAROL1, Muhammet BEKTAŞ1 |
1İstanbul Üniversitesi İstanbul Tıp Fakültesi, Biyofizik Anabilim Dalı, İstanbul 2İstanbul Bilim Üniversitesi Tıp Fakültesi, Fizyoloji Anabilim Dalı, İstanbul |
Keywords: Diphtheria toxin, F-actin, HUVEC |
Objective: Actin, the main component of microfilament
structure in eukaryotic cells, regulates signaling pathways by
interacting with actin binding proteins. Our previous studies
have shown that depolymerization of filamentous actin
(F-actin) occurs following its interaction with fragment A of
the toxin in endothelial cells infected with diphtheria toxin
and mutant diphtheria toxin (CRM-197) . In this study, it was
aimed to determine intracellular trafficking of diphtheria toxin
by stabilization of F-actin in endothelial cells.
Material and Methods: Human umbilical vein endothelial
cells were cultured and incubated with 0.1 μM jasplakinolide
for 30 and 60 minutes respectively. For diphtheria toxin
(0.75 nM) treatment, the incubation period with
jasplakinolide was limited to 15 minutes. Intracellular
stabilization of F-actin and diphtheria toxin traffic were
visualized using immunofluorescence microscopy.
Results: Depending on the duration of the incubation period,
it was determined that the stress fibers were expressed in the
cell membrane of the endothelial cells treated with
jasplakinolide. It was shown that diphtheria toxin trafficking
was not inhibited in F-actin-stabilized endothelial cells and
fragment A was directed to the perinuclear area.
Conclusion: Inhibition of G-actin / F-actin turnover in steady
state by intracellular F-actin stabilization does not stop
diphtheria toxin trafficking. This result supports studies showing
the importance of filamentous actin in toxin trafficking.
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