Distribution of different cells and seasonal variations of gonadotropin cells in the pituitary gland of Liza parsia (Hamilton, 1822) in relation to maturation of ovary

Chakrabarti P Bose S      

Abstract

The pituitary gland of Liza parsia (Hamilton, 1822) was of the cranio-leptobasic type and subdivided into three distinct zones innervated by the narrow and short strip of neurohypophysis. Different cell types were identified in the pituitary gland of L. parsia on the basis of their distribution and staining properties. The acidophilic lactotrophs or prolactin (PRL) cells and basophilic thyrotropic (TSH) cells stained with Mallory’s triple and Periodic Acid Schiff’s-Orange G (PAS-OG) and Aldehyde fuchsin (AF) were found in the rostral pars distalis (RPD) region. The PRL cells showed strong affinity to aniline blue. Between PRL cells and neurohypophysis (NH), adrenocorticotropic hormone secreting cells (ACTH) were found which gave faint purple colour (OG) with PAS-OG stain. The basophilic gonadotropic cells (GTH) and acidophilic somatotropic cells (STH) were distributed in the middle proximal pars distalis (PPD) region. The GTH cells were PAS, AF positive while STH cells were PAS and Acid Fuchsin positive. The melanocyte stimulating hormone secreting cells (MSH) were observed in the pars intermedia (PI) which were positively stained with PAS. No significant changes of the activities in all of the acidophilic cell types were observed throughout the year. However, The GTH and TSH cells reacted positively with PAS and exhibited both quantitative and qualitative variations during the ovarian cycle. During growth and pre-spawning period the GTH and TSH cells were characterized by homogeneous or granulated cytoplasm and recorded with maximum cellular diameters. The activity of GTH and TSH cells was reflected by low staining intensity as well as vacuolization of the cells during spawning period. During the post-spawning phase both the GTH and TSH cells stained weakly having atretic features. The substantial changes in the ovarian activity were correlated with the changes in the activity of the GTH and TSH cells of the pituitary gland in L. parsia.


MS Received Date:   2014-11-24  MS Accepted Date:  2015-01-01  MS Published Date:  2015-01-03
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Chakrabarti P, Bose S. "Distribution of different cells and seasonal variations of gonadotropin cells in the pituitary gland of Liza parsia (Hamilton, 1822) in relation to maturation of ovary" Journal of Zoology Studies 1.6 (2014): 33-49.
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Chakrabarti, P., Bose, S. (2014). Distribution of different cells and seasonal variations of gonadotropin cells in the pituitary gland of Liza parsia (Hamilton, 1822) in relation to maturation of ovary. Journal of Zoology Studies, 1(6), 33-49.
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Chakrabarti P, Bose S. Distribution of different cells and seasonal variations of gonadotropin cells in the pituitary gland of Liza parsia (Hamilton, 1822) in relation to maturation of ovary. Journal of Zoology Studies. 2014; 1(6): 33-49.
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