Abstract
The axial organ is considered as ancestral lymphoïd organ. It contains T and B sea star lymphocytes and Phagocytes. It plays a fundamental rôle in the sea star cell-mediated immune responses and humoral immune ones.Asterids belong to Echinoderma (Invertebrates).An expected rôle of Tiedemann’s bodies is evoked.
Highlights
The position of the echinoderms, in particular, has been a matter of doubt and controversy in the studies of the vertebrate ancestors [1]
We find a similar structure inside the Tiedemann’s bodies: they evoke lymph nodes.A schema represents these last ones in Fig.3 The various types of cells present in the axial organ have been studied in our laboratory, by optical and electron microscopy (S.E.M and T.E.M)
No stimulation was observed in the various controls. This result indicates that non-adherent cells (i-e sea star T lymphocytes) produce a lymphokine mediator which is able to stimulate the total axial organ cells
Summary
Immunology of Invertebrates, Div : Biochem/Biology, Orléans University (France) *Corresponding author: Michel Leclerc, Immunology of Invertebrates, Div : Biochem/Biology, Orléans University (France).
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