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Gadegone, M. M.
- Pituitary Colloid in Indian Mouse-Tailed Bat, Rhinopoma hardwickei hardwickei (Gray) in Relation to Reproductive Cycle
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1 Department of Zoology, Institute of Science, Nagpur (MS)-440001, IN
1 Department of Zoology, Institute of Science, Nagpur (MS)-440001, IN
Source
Journal of Endocrinology and Reproduction, Vol 16, No 2 (2012), Pagination: 65-70Abstract
Follicular colloids were examined in pituitary gland of Indian bat, Rhinopoma hardwickei hardwickei during annual reproductive cycle. Colloids were distributed throughout the pars distalis, pars intermedia and pars tuberalis. The colloid droplets were round or oval in shape. In some colloids outer border was irregular. These droplets were of various sizes and many of them were vacuolated. Pituitary colloids were observed during the different stages of the reproductive cycle. No change in number, size and shape was observed during anestrus, oestrus, and early pregnancy. At mid- and late pregnancy the number and size of colloid droplets increased. The increasing trend in number and size of colloid droplets was continued during early lactation also. At late lactation, colloid masses showed decrease in number and size. More colloid masses were observed in male pituitary than those observed in the female pituitary.Keywords
Bat, Pituitary Colloid, Reproductive Cycle.
- Cytological Study of the Hypophysis Pars Anterior of the Indian Emballonurid Bat Taphozous kachhensis (Dobson)
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Affiliations
1 Department of Zoology, Institute of Science, Nagpur-440001, IN
1 Department of Zoology, Institute of Science, Nagpur-440001, IN
Source
Journal of Endocrinology and Reproduction, Vol 13, No 2 (2009), Pagination: 57-62Abstract
The anterior pituitary gland (pars anterior) of the bat Taphozous kachhensis was examined cytochemically by employing several cytochemical staining techniques. Six cell types could be recognized, on the basis of their morphological characteristics and tinctorial properties, viz., two types of non-mucoid (acidophilic) STH and LTH, and three types of mucoid (basophilic) TSH, FSH and LH cells; the sixth, ACTH cells, were amphophilic. The cells are arranged in follicles or acini, separated from each other by a thin layer of connective tissue. The non-mucoid cells are much more concentrated in the postero-lateral and postero-median regions of the pars distalis. ACTH and TSH cells are mostly localised in large numbers in the peripheral region of the pars distalis. FSH cells are concentrated towards the antero-lateral, anterior and median regions. LH cells are distributed throughout the pars anterior but are more abundant towards the posterior and lateral regions. The probable role of these cell types in the physiology of reproduction of this bat is discussed.Keywords
Anterior Pituitary Gland, Bat, Cytochemistry, Reproductive Cycle.- Ultrastructural Organization of the Corpus Luteum of the Indian Emballonurid Bat, Taphozous longimanus (Hardwicke)
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Affiliations
1 Cell Biology Section, Department of Zoology, Institute of Science, Nagpur – 440001, IN
1 Cell Biology Section, Department of Zoology, Institute of Science, Nagpur – 440001, IN
Source
Journal of Endocrinology and Reproduction, Vol 11, No 2 (2007), Pagination: 76-81Abstract
The paper describes the ultrastructural organization of the corpus luteum of the emballonurid bat, Taphozous longimanus (Hardwicke). This bat is continuously asychronous breeder, exhibiting aseasonal polyoestry. During the early part of gestation, the luteal cells are compactly arranged with clearly demarcated boundaries, and show only moderate hypertrophy. Ultrastructural study of luteal cells during early pregnancy reveals the presence of irregularly shaped euchromatic nucleus, rod-shaped mitochondria with tubular or vesicular cristae, numerous lipid droplets and profiles of smooth/agranular endoplasmic reticulum in the form of short tubules or vesicles. The close association of mitochondria with lipid droplets and agranular endoplasmic reticulum in the luteal cells suggests that these cells are actively involved in steroidogenesis. During mid-pregnancy, the luteal cells are hypertrophied and are highly vacuolated. Large number of hypertrophied mitochondria, increased profiles of tubular cisternae of smooth endoplasmic reticulum and abundant lipid droplets in the cytoplasm of luteal cells during mid-pregnancy indicate an increase in the steroidogenic activity.Keywords
Bat, Corpus Luteum, Luteal Cells, Progesterone, Pregnancy.- Electron Microscopic Studies on the Adrenal Gland of Hipposiderid Male Bat, Hipposideros lankadiva
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Authors
A. Dhamani
1,
M. M. Gadegone
1
Affiliations
1 Department of Zoology, Institute of Science, Nagpur, IN
1 Department of Zoology, Institute of Science, Nagpur, IN
Source
Journal of Endocrinology and Reproduction, Vol 7, No 1&2 (2003), Pagination: 57-58Abstract
Adrenocortical and medullary zones are distinct in Hipposideros lankadiva. The cortex is further differentiated into three distinct zones-zona glomerulosa, fasciculata and zona reticularis. The cells of zona glomerulosa are polyhedral and are arranged in the form of acini or group of cells. Mitochondria are rod shaped with lamelliform or tubular cristae and are randomly distributed in the cytoplasm. Golgi apparatus is indistinct. Profiles of rough endoplasmic reticulum are scarce. Few profiles of vesicular agranular endoplasmic reticulum are observed. Few lipid droplets and lysosomes are also encountered in the cytoplasm.- Secretion of Mucins in the Fallopian Tube Epithelium of the Bat Taphozous kachhensis Dobson
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Journal of Endocrinology and Reproduction, Vol 19, No 2 (2015), Pagination: 57-63Abstract
Taphozous kachhensis is one of the largest Indian microchiropteran bats with a prominent gular pouch on the ventral side of the lower jaw. This is a seasonally monoestrous species and breeds once in a year. The Fallopian tube epithelium of T. kachhensis in both the segments, ampullary and isthumic, is lined by two cell types: ciliated and non-ciliated (secretory). The Fallopian tube shows alterations in its muco-subtances during estrus and pregnancy. The ciliated cells elaborate large quantity of glycogen, while non-ciliated cells elaborate high amounts of glycogen and neutral and acid mucins during estrus. Mucins are localized in the cytoplasm as well as cytoplasmic blebs. Glycogen and other muco-substances in non-ciliated cells decrease during pregnancy and the ciliated cells show a small amount of glycogen only. The concentration of muco-substances is highest during estrus, and the cytoplasmic blebs are numerous and prominent and are filled with secretion during this stage.Keywords
Bat, Estrus, Fallopian Tube, Pregnancy, Tubal Epithelium.References
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- Seasonal Changes in the Secretory Activity of Seminal Vesicles of the Indian Fruit Bat Rousettus leschenaulti (Desmarest 1820)
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Journal of Endocrinology and Reproduction, Vol 19, No 2 (2015), Pagination: 64-68Abstract
The epithelium of the seminal vesicles of Rousettus leschenaultia shows cyclical pattern in the secretory activity during the reproductive cycle. During the sexually quiescent phase, the seminal vesicles are regressed; the cytoplasm of the epithelial cells contains coarse secretory granules and the lumina of the tubules are empty. The secretion is in the form of secretory blebs in this species of bat. The formation of secretory blebs from the columnar epithelial cells is initiated during the recrudescent phase and is at its peak during the active breeding phase. These secretory blebs are discharged into the lumen of the tubules. Lumina of the tubules are filled with secretory blebs during the recrudescent and active breeding phases. Later on these blebs disintegrate and dissolve to form a homogenous material in the lumen of the tubules. Thus, the mode of secretion in the seminal vesicle of Rousettus is apocrine. The functional significance of the secretion of the seminal vesicles in reproduction of male bat is discussed.Keywords
Bat, Epithelial Cells, Reproductive Cycle, Seminal Vesicles, Secretory Activity.References
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