Early events in spontaneous neutrophil apoptosis

D Scheel-Toellner, KQ Wang, PR Webb… - Biochemical Society …, 2004 - portlandpress.com
D Scheel-Toellner, KQ Wang, PR Webb, SH Wong, R Craddock, LK Assi, M Salmon…
Biochemical Society Transactions, 2004portlandpress.com
Neutrophils are very abundant, short-lived leucocytes and their death by apoptosis is central
to homoeostasis and the resolution of inflammation, yet the trigger for apoptosis is still a
topic of debate. Depolarization of the mitochondrial membrane has been supposed to
initiate neutrophil spontaneous apoptosis, as neutrophils gradually lose the anti-apoptotic
protein Mcl-1 and Bax translocates and inserts into the mitochondrial membrane. However,
other reports show that caspase 8 is required for neutrophil apoptosis, suggesting the …
Neutrophils are very abundant, short-lived leucocytes and their death by apoptosis is central to homoeostasis and the resolution of inflammation, yet the trigger for apoptosis is still a topic of debate. Depolarization of the mitochondrial membrane has been supposed to initiate neutrophil spontaneous apoptosis, as neutrophils gradually lose the anti-apoptotic protein Mcl-1 and Bax translocates and inserts into the mitochondrial membrane. However, other reports show that caspase 8 is required for neutrophil apoptosis, suggesting the involvement of DR (death receptor) signalling. As DR ligation is not required for neutrophil apoptosis, this raises the intriguing possibility that activation of caspase 8 during neutrophil apoptosis occurs via a novel mechanism. In the present paper, we discuss the current evidence for mechanisms occurring in neutrophil apoptosis, which could trigger DR signalling in the absence of DR ligation.
portlandpress.com