Abstract:
:The hydrozoa life cycle is characterized, in normal conditions, by the alternation of a post-larval benthic polyp and an adult pelagic medusa; however, some species of Hydrozoa react to environmental stress by reverting their life cycle: i.e. an adult medusa goes back to the juvenile stage of polyp. This very uncommon life cycle could be considered as some sort of inverted metamorphosis. A morphological study of different stages during the reverted life cycle of Turritopsis nutricula led to the characterization of four different stages: healthy medusa, unhealthy medusa, four-leaf clover and cyst. The ultrastructural study of the cellular modifications (during the life cycle reversion of T. nutricula) showed the presence of both degenerative and apoptotic processes. Degeneration was prevalent during the unhealthy medusa and four-leaf clover stages, while the apoptotic rate was higher during the healthy medusa and cyst stages. The significant presence of degenerative and apoptotic processes could be related to the occurrence of a sort of metamorphosis when an adult medusa transforms itself into a polyp.
journal_name
Tissue Celljournal_title
Tissue & cellauthors
Carla' EC,Pagliara P,Piraino S,Boero F,Dini Ldoi
10.1016/s0040-8166(03)00028-4subject
Has Abstractpub_date
2003-06-01 00:00:00pages
213-22issue
3eissn
0040-8166issn
1532-3072pii
S0040816603000284journal_volume
35pub_type
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