IngentaConnect Signalling shutdown strategies in aging immune cells

Authors: Khurram Ayub¹; Maurice B. Hallett

Source: Aging Cell, Volume 3, Number 4, August 2004 , pp. 145-149(5)

Abstract:

Summary

It is important for the resolution of inflammation that the number and activity of immune cells are reduced. Clearance of immune cells may be achieved by apoptosis and phagocytosis of cell fragments by macrophages. However, signalling shutdown by immune cells committed to apoptosis occurs early in the progression of these cells towards fragmentation and, it could be argued, is a key feature of apoptosis. There is surprisingly little known about the mechanisms that underlie this signalling shutdown, in particular the shutdown of Ca²⁺ influx. The consequences and the potential mechanisms by which Ca²⁺ influx shutdown is achieved are discussed. In addition, the potential consequences for cell signalling of cytochrome c release from mitochondria and of phosphatidyl-serine externalization are discussed. The aim of the review is therefore to highlight the evidence for various signalling shutdown strategies in immune cells that may limit their activity during progression towards apoptosis.

Keywords: aging; apoptosis; Ca2+ signalling; fas; neutrophils; phagocytosis

Document Type: Research article

DOI: 10.1111/j.1474-9728.2004.00100.x

Affiliations: 1: Neutrophil Signalling Group, University Department of Surgery, University of Wales College of Medicine, Heath Park, Cardiff CF14 4XN, UK

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