Ovarian structure in Milnesium tardigradum (Tardigrada, Milnesiidae) during early vitellogenesis

Atsushi C. Suzuki

doi:10.1007/s10750-005-1416-6

Ovarian structure in Milnesium tardigradum (Tardigrada, Milnesiidae) during early vitellogenesis

Atsushi C. Suzuki

School of Medicine

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The ultrastructure of the ovary of Milnesium tardigradum during early vitellogenesis is described. Within the ovary, there were large multinuclear cells surrounded by many mononuclear oocytes. Observation of serial sections revealed four multinuclear cells that were connected to each other by cytoplasmic bridges. Each peripheral oocyte was connected to the multinuclear cell. An enormous ER-like structure was conspicuous in the centre of the multinuclear cell. The presence of large numbers of lipid droplets and yolk granules in both multinuclear cells and many mononuclear oocytes suggested a role as nurse cells. A small number of these oocytes grow to be eggs. The structural features of the multinuclear nurse cell were compared with other known examples.

Original language	English
Pages (from-to)	61-66
Number of pages	6
Journal	Hydrobiologia
Volume	558
Issue number	1
DOIs	https://doi.org/10.1007/s10750-005-1416-6
Publication status	Published - 2006 Mar

Keywords

Cytoplasmic bridge
Multinuclear nurse cells
Oocytes
Oogenesis
Ovary
Tardigrades

ASJC Scopus subject areas

Aquatic Science

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10.1007/s10750-005-1416-6

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title = "Ovarian structure in Milnesium tardigradum (Tardigrada, Milnesiidae) during early vitellogenesis",

abstract = "The ultrastructure of the ovary of Milnesium tardigradum during early vitellogenesis is described. Within the ovary, there were large multinuclear cells surrounded by many mononuclear oocytes. Observation of serial sections revealed four multinuclear cells that were connected to each other by cytoplasmic bridges. Each peripheral oocyte was connected to the multinuclear cell. An enormous ER-like structure was conspicuous in the centre of the multinuclear cell. The presence of large numbers of lipid droplets and yolk granules in both multinuclear cells and many mononuclear oocytes suggested a role as nurse cells. A small number of these oocytes grow to be eggs. The structural features of the multinuclear nurse cell were compared with other known examples.",

keywords = "Cytoplasmic bridge, Multinuclear nurse cells, Oocytes, Oogenesis, Ovary, Tardigrades",

author = "Suzuki, {Atsushi C.}",

note = "Funding Information: I am grateful to Drs Katsumi Miyazaki (Seto Marine Biological Laboratory) and Tadaaki Tsutsumi (Fukushima University) for the valuable discussion, and to Dr Masaaki Wada (Nara Women{\textquoteright}s University) for releasing the DeltaViewer program. This work was supported by a grant from Keio Gijuku Academic Development Funds. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2006",

month = mar,

doi = "10.1007/s10750-005-1416-6",

language = "English",

volume = "558",

pages = "61--66",

journal = "Hydrobiologia",

issn = "0018-8158",

publisher = "Springer Netherlands",

number = "1",

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T1 - Ovarian structure in Milnesium tardigradum (Tardigrada, Milnesiidae) during early vitellogenesis

AU - Suzuki, Atsushi C.

N1 - Funding Information: I am grateful to Drs Katsumi Miyazaki (Seto Marine Biological Laboratory) and Tadaaki Tsutsumi (Fukushima University) for the valuable discussion, and to Dr Masaaki Wada (Nara Women’s University) for releasing the DeltaViewer program. This work was supported by a grant from Keio Gijuku Academic Development Funds. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2006/3

Y1 - 2006/3

N2 - The ultrastructure of the ovary of Milnesium tardigradum during early vitellogenesis is described. Within the ovary, there were large multinuclear cells surrounded by many mononuclear oocytes. Observation of serial sections revealed four multinuclear cells that were connected to each other by cytoplasmic bridges. Each peripheral oocyte was connected to the multinuclear cell. An enormous ER-like structure was conspicuous in the centre of the multinuclear cell. The presence of large numbers of lipid droplets and yolk granules in both multinuclear cells and many mononuclear oocytes suggested a role as nurse cells. A small number of these oocytes grow to be eggs. The structural features of the multinuclear nurse cell were compared with other known examples.

AB - The ultrastructure of the ovary of Milnesium tardigradum during early vitellogenesis is described. Within the ovary, there were large multinuclear cells surrounded by many mononuclear oocytes. Observation of serial sections revealed four multinuclear cells that were connected to each other by cytoplasmic bridges. Each peripheral oocyte was connected to the multinuclear cell. An enormous ER-like structure was conspicuous in the centre of the multinuclear cell. The presence of large numbers of lipid droplets and yolk granules in both multinuclear cells and many mononuclear oocytes suggested a role as nurse cells. A small number of these oocytes grow to be eggs. The structural features of the multinuclear nurse cell were compared with other known examples.

KW - Cytoplasmic bridge

KW - Multinuclear nurse cells

KW - Oocytes

KW - Oogenesis

KW - Ovary

KW - Tardigrades

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U2 - 10.1007/s10750-005-1416-6

DO - 10.1007/s10750-005-1416-6

M3 - Article

AN - SCOPUS:29844441090

SN - 0018-8158

VL - 558

SP - 61

EP - 66

JO - Hydrobiologia

JF - Hydrobiologia

IS - 1

ER -

Ovarian structure in Milnesium tardigradum (Tardigrada, Milnesiidae) during early vitellogenesis

Abstract

Keywords

ASJC Scopus subject areas

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