A pathway for phagosome maturation during engulfment of apoptotic cells

Jason M. Kinchen, Kimon Doukoumetzidis, Johann Almendinger, Lilli Stergiou, Annie Tosello-Trampont, Costi D. Sifri, Michael O. Hengartner, Kodi S. Ravichandran

Research output: Contribution to journalArticlepeer-review

101 Scopus citations


Removal of apoptotic cells is critical for the physiological well-being of the organism and defects in corpse removal have been linked to disease states. Genes regulating corpse recognition and internalization have been identified, but few molecules involved in the processing of internalized corpses are known. Through a combination of targeted and unbiased reverse genetic screens in Caenorhabditis elegans, and studies in mammalian cells, we have identified genes required for maturation of apoptotic-cell-containing phagosomes. We have further ordered these candidates, which include the GTPases RAB-5 and RAB-7 and the HOPS complex, into a coherent linear pathway for the maturation of apoptotic cells within phagosomes. In depth analysis of two additional candidate genes, the phosphatidylinositol 3 kinase (PI(3)K) vps-34 (A001762) and dyn-1/dynamin, showed an accumulation of internalized, but undegraded, corpses within abnormal Rab5-negative phagosomes. We ordered these candidates in our pathway, with DYN-1 functioning upstream of VPS-34 in the recruitment and/or retention of RAB-5 to the phagosome. Finally, we have also identified a previously undescribed biochemical complex containing Vps34, dynamin and Rab5GDP, thus providing a mechanism for Rab5 recruitment to the nascent phagosome.

Original languageEnglish
Pages (from-to)556-566
Number of pages11
JournalNature Cell Biology
Issue number5
StatePublished - May 2008


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