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Summary Despite numerous publications on nucleoli, their participation in terminal maturation and programmed cell death have not been studied extensively. On the other hand, some observations clearly indicate that terminal maturation and programmed cell death are accompanied by marked nucleolar changes which reflect the cessation of nucleolar biosynthetic activities. In addition, nucleolar changes in the course of terminal maturation may precede programmed cell death. Keywords: nucleolus – erythrocytic and granulocytic precursors – terminal maturation – programmed cell death INTRODUCTION Despite numerous reports on nucleoli in the literature (see Busch and Smetana 1970, Wachtler and Stahl 1983, Pederson 1998), its role in terminal maturation, programmed cell death and apoptosis has been less well studied and understood (Martelli et al. 2001). The maturation compartments and terminal maturation stages of erythroid and granulocytic lineages are very convenient cells for such studies because they are well defined in both blood forming organs and peripheral blood (Bessis 1974).

Are nucleoli participating in programmed cell death? (MINI-REVIEW AND RECENT OBSERVATIONS)