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Accelerated apoptosis of neutrophils in familial mediterranean Fever
#MMPMID26042122
Manukyan G
; Aminov R
; Hakobyan G
; Davtyan T
Front Immunol
2015[]; 6
(?): 239
PMID26042122
show ga
The causative mutations for familial Mediterranean fever (FMF) are located in the
MEFV gene, which encodes pyrin. Pyrin modulates the susceptibility to apoptosis
via its PYD domain, but how the mutated versions of pyrin affect apoptotic
processes are poorly understood. Spontaneous and induced rates of systemic
neutrophil apoptosis as well as the levels of proteins involved in apoptosis were
investigated ex vivo in patients with FMF using flow cytometry and RT-qPCR. The
freshly collected neutrophils from the patients in FMF remission displayed a
significantly larger number of cells spontaneously entering apoptosis compared to
control (6.27?±?2.14 vs. 1.69?±?0.18%). This elevated ratio was retained after
24?h incubation of neutrophils in the growth medium (32.4?±?7.41 vs.
7.65?±?1.32%). Correspondingly, the mRNA level for caspase-3 was also
significantly increased under these conditions. In response to the inducing
agents, the neutrophils from FMF patients also displayed significantly elevated
apoptotic rates compared to control. The elevated rates, however, can be largely
explained by the higher basal ratio of apoptotic cells in the former group.
Monitoring of several proteins involved in apoptosis has not revealed any
conventional mechanisms contributing to the enhanced apoptotic rate of
neutrophils in FMF. Although the exact molecular mechanisms of accelerated
neutrophil apoptosis in FMF remain unknown, it may provide a protection against
excessive inflammation and tissue damage due to a massive infiltration of
neutrophils in the acute period of the disease.