Rapid externalization of 27‐kDa heat shock protein (HSP27) and atypical cell death in neutrophils treated with the sphingolipid analog drug FTY720

FTY720 induces rapid cell surface expression of HSP27, which coincides with atypical cell death sensitive to inhibitors of apoptosis, necroptosis, or NADPH oxidase. The sphingolipid analog fingolimod is known to induce apoptosis of tumor cells and lymphocytes. Its effect on neutrophils has not been...

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Bibliographic Details
Published in:Journal of leukocyte biology 2015-10, Vol.98 (4), p.591-599
Main Authors: Skrzeczyńska‐Moncznik, Joanna, Bzowska, Małgorzata, Nogieć, Anna, Sroka, Agnieszka, Zarebski, Mirosław, Vallières, Luc, Guzik, Krzysztof
Format: Article
Language:English
Subjects:
apoptosis
Blotting, Western
Cell Death - drug effects
Cell Death - physiology
Cells, Cultured
DNA Fragmentation
Fingolimod Hydrochloride - pharmacology
Flow Cytometry
HSP27 Heat-Shock Proteins - metabolism
Humans
Immunosuppressive Agents - pharmacology
Microscopy, Confocal
MLKL
NADPH oxidase
necroptosis
Neutrophils - drug effects
Neutrophils - metabolism
Oxidative Stress - drug effects
Oxidative Stress - physiology
phosphatidylserine
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Summary:FTY720 induces rapid cell surface expression of HSP27, which coincides with atypical cell death sensitive to inhibitors of apoptosis, necroptosis, or NADPH oxidase. The sphingolipid analog fingolimod is known to induce apoptosis of tumor cells and lymphocytes. Its effect on neutrophils has not been investigated so far. Here, we describe a fingolimod‐induced atypical cell death mechanism in human neutrophils, characterized by rapid translocation of heat shock protein 27 to the cell surface, extensive cell swelling and vacuolization, atypical chromatin staining and nuclear morphology, and phosphorylation of mixed lineage kinase domain‐like protein. Fingolimod also induces typical apoptotic features, including rapid externalization of phosphatidylserine and activation of caspase‐8. Fingolimod‐induced neutrophil death is independent of sphingosine‐1‐phosphate receptors and positively regulated by protein phosphatase A. Externalization of phosphatidylserine and heat shock protein 27 can be partially inhibited by inhibitors of caspase‐8 [Z‐Ile‐Glu(O‐Me)‐Thr‐Asp(O‐Me)‐fluoromethyl ketone], receptor‐interacting protein kinase 1 (necrostatin‐1), receptor‐interacting protein kinase 3 (necrosulfonamide), and heat shock protein 90 [geldanamycin and 17‐(dimethylaminoethylamino)‐17‐demethoxygeldanamycin]. Furthermore, NADPH oxidase 1 inhibition with diphenyleneiodonium chloride protects neutrophils against fingolimod‐mediated cell death. Overall, these observations suggest that fingolimod acts through a mechanism involving the necrosome signaling complex and the oxidative stress machinery.
ISSN:0741-5400
1938-3673
DOI:10.1189/jlb.3VMA1114-522RR