Peroxisomes are a class of ubiquitous and dynamic single
membrane-bounded cell organelles, devoid of DNA, with an essentially
oxidative type of metabolism. In recent years it has become increasingly
clear that peroxisomes are involved in a range of important cellular
functions in almost all eukaryotic cells. In higher eukaryotes,
including humans, peroxisomes catalyze ether phospholipids biosynthesis,
fatty acid alpha-oxidation, glyoxylate detoxification, etc, and in
humans peroxisomes are associated with several important genetic
diseases. In plants, peroxisomes carry out the fatty acid
beta-oxidation, photorespiration, metabolism of ROS, RNS and RSS,
photomorphogenesis, biosynthesis of phytohormones, senescence, and
defence against pathogens and herbivores. In recent years it has been
postulated a possible contribution of peroxisomes to cellular signaling.
In this volume an updated view of the capacity and function of
peroxisomes from human, animal, fungal and plant origin as cell
generators of different signal molecules involved in distinct processes
of high physiological importance is presented.