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Roshdy K, Alsafy MAM, El-Gendy SAA, El-Mansi AA, Rezk S. Microscopic Focus on the Thyroid Follicles of the One-Humped Camel (Camelus dromedarius). MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2024; 30:382-391. [PMID: 38442192 DOI: 10.1093/mam/ozae010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 12/09/2023] [Accepted: 02/07/2024] [Indexed: 03/07/2024]
Abstract
The microstructure of the thyroid gland of the one-humped camel (Camelus dromedarius) was described using morphometric, histological, immunohistochemical staining, and ultrastructural standard techniques. The follicular secretory units of the thyroid glands displayed comparable and variable sizes where the large follicles were situated at the peripheral margins; however, the small ones were located in the central region. Semisquamous epithelium (low cuboidal) lined the large thyroid follicles, while high cuboidal (columnar) epithelium lined the small ones. Our electron microscopic findings revealed that the low-sized cuboidal follicular cells lack organelles and are hypoactive. The high cuboidal follicular cells are active cells and rich in cellular organelles such as cisternae of rough endoplasmic reticulum, mitochondria, colloid droplets, scrolled Golgi apparatus, and secretory vesicles. A few degenerate follicular cells appeared on rare occasions. The parafollicular cells appeared with a more prominent and conspicuous nucleus than the follicular cells. The follicular cells were classified as active, inactive, or degenerated using transmission electron microscopy. The follicular and parafollicular cells showed calcitonin-positive immunoreactivity. Overall, the presented results showed particular convergences of the morphostructural aspects of the thyroid gland of C. dromedarius to that of other mammals with some distinctive features to cope with their physiology and harsh niche.
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Affiliation(s)
- Karam Roshdy
- Department of Histology and Cytology, Faculty of Veterinary Medicine, Alexandria University, Alexandria 21944, Egypt
| | - Mohamed A M Alsafy
- Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Alexandria University, Alexandria 21944, Egypt
| | - Samir A A El-Gendy
- Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Alexandria University, Alexandria 21944, Egypt
| | - Ahmed A El-Mansi
- Biology Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia
| | - Shaymaa Rezk
- Department of Cytology and Histology, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
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Nakamura T, Elewa YHA, Ichii O, Hosotani M, Ghonimi WAM, Tatsumi O, Nagasaki KI, Kon Y. Restricted localization of ultimobranchial body remnants and parafollicular cells in the one-humped camel (Camelus dromedarius). J Vet Med Sci 2018; 80:1368-1372. [PMID: 30068831 PMCID: PMC6160880 DOI: 10.1292/jvms.18-0298] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Parafollicular cells (C-cells) exist within the thyroid glands and display different distributions within the glands among mammalian species. In the one-humped camel (Camelus
dromedarius), localization of the C-cells remains under debate. We herein investigated appearance of C-cells and the remnants of the ultimobranchial body, origin of C-cells, in
the thyroid glands of one-humped camels. Macroscopically, a white mass was present at one-third the length from the cranial end of the thyroid glands where the cranial thyroid artery
entered. In addition, large fossae were frequently found adjacent to the white mass. Histologically, the mass was mainly composed of connective tissues, thyroid follicles, and two types of
cell clusters: one was composed of cells with clear cytoplasm and the other was composed of non-keratinized epidermoid cells. The mass and the fossae contained p63-positive cells, indicating
that they consisted of ultimobranchial body remnants. Calcitonin was expressed in cells with clear cytoplasm, which were localized just beneath the fossae and in the cell clusters of the
white mass. C-cells also resided in both subfollicular and interfollicular spaces adjacent to the white mass, but gradually decreased toward the periphery. C-cells tended to display round
shapes in the ultimobranchial body remnants and subfollicular spaces, and spindle shapes in interfollicular spaces. In conclusion, we demonstrated that the ultimobranchial body remnants were
limited to the region around the entrance of cranial thyroid artery and vein, and C-cells were mainly concentrated within and around the ultimobranchial body remnants.
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Affiliation(s)
- Teppei Nakamura
- Section of Biological Science, Chitose Laboratory, Japan Food Research Laboratories, Chitose, Hokkaido 066-0052, Japan.,Laboratory of Anatomy, Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan
| | - Yaser Hosny Ali Elewa
- Laboratory of Anatomy, Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan.,Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt
| | - Osamu Ichii
- Laboratory of Anatomy, Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan
| | - Marina Hosotani
- Laboratory of Anatomy, Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan
| | - Wael A M Ghonimi
- Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44519, Egypt
| | - Osamu Tatsumi
- Section of Biological Science, Chitose Laboratory, Japan Food Research Laboratories, Chitose, Hokkaido 066-0052, Japan
| | - Ken-Ichi Nagasaki
- Section of Biological Safety Research, Tama Laboratory, Japan Food Research Laboratories, Tama, Tokyo 206-0025, Japan
| | - Yasuhiro Kon
- Laboratory of Anatomy, Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan
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Nerkar AA, Gadegone MM. Secretory Processes in Follicular Cells of the Thyroid Gland of the Indian Sheath-tailed Bat, Taphozous longimanus (Hardwicke): A Ultrastructural Study. CYTOLOGIA 2011. [DOI: 10.1508/cytologia.76.143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Archana A. Nerkar
- Cell Biology Section, Department of Zoology, The Institute of Science
| | - Mohan M. Gadegone
- Cell Biology Section, Department of Zoology, The Institute of Science
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Abdel-Magied EM, Taha AA, Abdalla AB. Light and electron microscopic study of the thyroid gland of the camel (Camelus dromedarius). Anat Histol Embryol 2000; 29:331-6. [PMID: 11199476 DOI: 10.1046/j.1439-0264.2000.00260.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The thyroid gland of sexually immature dromedary camels was studied using both light and electron microscopy. The thyroid gland contained follicles of different sizes in both summer and winter. However, most of the follicles were large in summer and small in winter. The large follicles were lined by very low cuboidal or semi-squamous follicular cells whereas the small ones were lined by high cuboidal or low columnar follicular cells. Electron microscopy showed that the very low cuboidal follicular cells were poor in organelles and were considered hypoactive. High cuboidal follicular cells on the other hand, were rich in organelles that included mitochondria, cisternae of rough endoplasmic reticulum, secretory vesicles, colloid droplets, heterosomes and autophagic vacuoles; they were considered to be very active. The possible role played by these organelles is synthesis of thyroglobulin and liberation of tri- and tetraiodothyronine is discussed. A few degenerate follicular cells were infrequently encountered in the camel thyroid. Parafollicular (C) cells were not seen in this study either with light or electron microscopy.
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Affiliation(s)
- E M Abdel-Magied
- Department of Veterinary Medicine, King Saud University, PO Box 1482, Buraidah, Kingdom of Saudi Arabia
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