Journal of Cell Science, Vol 110, Issue 18 2303-2314, Copyright © 1997 by Company of Biologists

JOURNAL ARTICLES

Maturation of phagosomes is accompanied by changes in their fusion properties and size-selective acquisition of solute materials from endosomes

M Desjardins, NN Nzala, R Corsini and C Rondeau
Departement d'anatomie, Universite de Montreal, Montreal, Quebec, Canada.

Maturation of phagosomes is characterized by changes in their polypeptides, phosphorylated proteins and phospholipid composition. Kinetic analyses have shown that a variety of proteins associate and dissociate from latex-containing phagosomes at precise intervals during phagolysosome biogenesis. In an attempt to link these temporal biochemical modifications to functional changes, we have examined the in vivo fusion properties of aging endosomes and phagosomes. Using an in vivo fusion assay at the electron microscope, we measured the rate of exchange of bovine serum albumin-gold (5 and 16 nm particles) between endosomes and latex-bead-containing phagosomes. The results obtained indicate that the maturation of phagosomes is accompanied by changes of their fusion properties. Early phagosomes were shown to fuse preferentially with early endocytic organelles and to gradually acquire the ability to fuse with late endocytic organelles. Furthermore, the transfer of bovine serum albumin-gold from endosomes to phagosomes is size-dependent, a process also modulated by the maturation of these organelles, in agreement with the concept that transient fusion events occur between endosomes and phagosomes. Biochemical analysis showed variations in the levels of rab proteins associated with phagosomes during maturation while other 'fusion' proteins, including synaptobrevin1 and synaptobrevin2, remained constant.

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