Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle
Abstract The topography and structure of the follicular cells and the follicular cavity of the hypophyseal pars tuberalis (PT) were studied in adult hibernating bats ( Pipistrellus pipistrellus and Rhinolophus ferrumequinum ) of both sexes, during the annual seasonal cycle and the reproductive cycle...
Published in: | The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology |
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crwiley:10.1002/ar.a.10091 2024-06-02T08:13:20+00:00 Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle Azzali, Giacomo Arcari, Maria Luisa Spaggiari, Brunella Romita, Giuseppina 2003 http://dx.doi.org/10.1002/ar.a.10091 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Far.a.10091 https://onlinelibrary.wiley.com/doi/full/10.1002/ar.a.10091 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology volume 273A, issue 2, page 763-771 ISSN 1552-4884 1552-4892 journal-article 2003 crwiley https://doi.org/10.1002/ar.a.10091 2024-05-03T10:37:57Z Abstract The topography and structure of the follicular cells and the follicular cavity of the hypophyseal pars tuberalis (PT) were studied in adult hibernating bats ( Pipistrellus pipistrellus and Rhinolophus ferrumequinum ) of both sexes, during the annual seasonal cycle and the reproductive cycle. The follicular cells were found to be organized around a central cavity. They showed a polyhedral shape and apical microvilli protruding into central cavities. During hibernation, the follicular cells showed active cytoplasmic organelles, clusters of glycogen particles, and lipid droplets. In the supranuclear cytoplasm, 9+2 type cilia, some dense bodies, microvesicular vacuoles, and thin actin‐like filaments (rather scarce during autumn) were detected. The contents of the follicular cavity showed well‐defined ultrastructural seasonal characteristics, with a colloid‐like aspect during awakening and a strongly granular aspect during autumn oestrus and mating. Positive staining for PAS and paraldehyde fuchsin, and a marked reaction to lectins PHA‐L4, MAM, and RCA 60 suggested the presence of sialo‐glycoproteins in the follicular cavities. Both follicular and endocrine PT‐specific cells appeared to mark the boundary of follicular cavities. This finding suggests that the follicular cavity contents are comprised of both types of cells, rather than by cell fragmentation or degeneration products. Anat Rec Part A 273A:763–771, 2003. © 2003 Wiley‐Liss, Inc. Article in Journal/Newspaper Pipistrellus pipistrellus Wiley Online Library The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology 273A 2 763 771 |
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Wiley Online Library |
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English |
description |
Abstract The topography and structure of the follicular cells and the follicular cavity of the hypophyseal pars tuberalis (PT) were studied in adult hibernating bats ( Pipistrellus pipistrellus and Rhinolophus ferrumequinum ) of both sexes, during the annual seasonal cycle and the reproductive cycle. The follicular cells were found to be organized around a central cavity. They showed a polyhedral shape and apical microvilli protruding into central cavities. During hibernation, the follicular cells showed active cytoplasmic organelles, clusters of glycogen particles, and lipid droplets. In the supranuclear cytoplasm, 9+2 type cilia, some dense bodies, microvesicular vacuoles, and thin actin‐like filaments (rather scarce during autumn) were detected. The contents of the follicular cavity showed well‐defined ultrastructural seasonal characteristics, with a colloid‐like aspect during awakening and a strongly granular aspect during autumn oestrus and mating. Positive staining for PAS and paraldehyde fuchsin, and a marked reaction to lectins PHA‐L4, MAM, and RCA 60 suggested the presence of sialo‐glycoproteins in the follicular cavities. Both follicular and endocrine PT‐specific cells appeared to mark the boundary of follicular cavities. This finding suggests that the follicular cavity contents are comprised of both types of cells, rather than by cell fragmentation or degeneration products. Anat Rec Part A 273A:763–771, 2003. © 2003 Wiley‐Liss, Inc. |
format |
Article in Journal/Newspaper |
author |
Azzali, Giacomo Arcari, Maria Luisa Spaggiari, Brunella Romita, Giuseppina |
spellingShingle |
Azzali, Giacomo Arcari, Maria Luisa Spaggiari, Brunella Romita, Giuseppina Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
author_facet |
Azzali, Giacomo Arcari, Maria Luisa Spaggiari, Brunella Romita, Giuseppina |
author_sort |
Azzali, Giacomo |
title |
Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
title_short |
Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
title_full |
Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
title_fullStr |
Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
title_full_unstemmed |
Ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
title_sort |
ultrastructural aspects of the follicular cells of the pars tuberalis in bats related to the seasonal cycle |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1002/ar.a.10091 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Far.a.10091 https://onlinelibrary.wiley.com/doi/full/10.1002/ar.a.10091 |
genre |
Pipistrellus pipistrellus |
genre_facet |
Pipistrellus pipistrellus |
op_source |
The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology volume 273A, issue 2, page 763-771 ISSN 1552-4884 1552-4892 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ar.a.10091 |
container_title |
The Anatomical Record Part A: Discoveries in Molecular, Cellular, and Evolutionary Biology |
container_volume |
273A |
container_issue |
2 |
container_start_page |
763 |
op_container_end_page |
771 |
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1800736797762781184 |