First discovery of the podocytes in the circulatory system of enigmatic Echiurids (Annelida: Thalassematidae)

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Abstract

Fine structure of echiurid blood vessels in the proboscis is known in details, but the circulatory system of the trunk remains studied mainly at the level of general anatomy. The investigation of the trunk circulatory system in Bonellia viridis females revealed the presence of specialized podocytes in the ring vessel and anterior part of the ventral vessel. This study allowed to describe podocytes in echiurid circulatory system for the first time. Podocytes of B. viridis are characterized by a typical cellular architecture, which is known for other bilaterians: they consist of a cell body, primary processes, and pedicels that are interconnected via specialized slit diaphragms. The presence of podocytes in the ventral and ring vessels indicates these parts of circulatory system as sites of ultrafiltration in echiurids, i.e., exactly in these palaces, the filtration of plasma occurs through the basal lamina to the body cavity.

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About the authors

P. А. Kuznetsov

Lomonosov Moscow State University; Institut Méditerranéen de Biodiversité et d’Ecologie Marine et Continentale (IMBE), Aix Marseille University, CNRS, IRD, Avignon University

Email: temereva@mail.ru
Russian Federation, Moscow; France, Marseille

A. V. Ereskovsky

Lomonosov Moscow State University; Institut Méditerranéen de Biodiversité et d’Ecologie Marine et Continentale (IMBE), Aix Marseille University, CNRS, IRD, Avignon University; Koltzov Institute of Developmental Biology of Russian Academy of Sciences

Email: temereva@mail.ru
Russian Federation, Moscow; France, Marseille; Moscow

Е. N. Temereva

Lomonosov Moscow State University

Author for correspondence.
Email: temereva@mail.ru
Russian Federation, Moscow

References

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2. Fig. 1. Podocytes in the circulatory system of Bonellia viridis females: (a) – a diagram of the organization of the circulatory system (b) – a podocyte on a cross section of a ventral blood vessel, TEM, (c) – primary processes and cytopodia of a podocyte of a ventral blood vessel, TEM, (d) – cytopodia of podocytes in a ventral blood vessel, (e) – cytopodia of podocytes in an annular vessel, (e) – a diagram of the structure of a podocyte with cytopodia: arrows show the direction of fluid movement from the circulatory system into the cavity of the trunk coeloma. Designations: (abv) – axial blood vessel, (appr) – apical outgrowth, (bl) – basal plate, (bs) – vessel cavity, (cb) – cell body, (cf) – collagen filaments, (chrv) – annular vessel of bristles, (dbv) – dorsal blood vessel, (ecm) – extracellular matrix, (G) – Golgi complex, (is) – perinatal sinus, (lbv) – lateral blood vessel, (lo) – proboscis blade, (mf) – myofilaments, (nu) – nucleus, (nibv) – neuro-intestinal blood vessel, (nu) is the nucleus, (pp) is the primary process of the podocyte, (pr) is the trunk, (rbv) is the annular blood vessel, (tr) – trunk, (sd) – slit diaphragm, (vbv) – ventral blood vessel, (vs) – vesicles. Asterisks (*) indicate the coelomic cavity, the tips of the arrows indicate the cytopodia of the podocytes. The scale is 1 micron.

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Presented by Academician of the RAS V. V. Malakhov


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