Evolution of Neurohypophysial Hormones and Their Functions1

2015 ◽  
pp. 1-8 ◽  
Author(s):  
Wilbur K. Sawyer ◽  
Peter K. T. Pang
Keyword(s):  
Neurohypophysial Hormones

scholarly journals Neurohypophysial Hormones Associated with Osmotic Challenges in the Brain and Pituitary of the Euryhaline Black Porgy, Acanthopagrus schlegelii

Cells ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 3086
Author(s):  
Adimoolam Aruna ◽  
Chien-Ju Lin ◽  
Ganesan Nagarajan ◽  
Ching-Fong Chang
Keyword(s):  
Osmotic Stress ◽  
Differential Expression ◽  
Serum Cortisol ◽  
Arginine Vasotocin ◽  
Acanthopagrus Schlegelii ◽  
Neurohypophysial Hormones ◽  
Black Porgy ◽  
Pituitary Glands ◽  
The Brain

Our study showed differential expression of the arginine vasotocin (avt)/isotocin (it) in the brain and pituitary gland of the euryhaline black porgy (Acanthopagrus schlegelii) during osmotic stress. A decrease in serum osmolality and increased cortisol levels were observed after acute transfer from seawater (SW) to freshwater (FW). The increased expressions of avt, avt receptor (avtr: v1a), and isotocin receptor (itr: itr1) transcripts on day 1 and it and itr transcripts on days 7 and 30 were found in the brains and pituitary glands of FW fish. Increased levels of avt mRNA in the diencephalon and avtr mRNA in the pituitary together with serum cortisol on day 1 of FW exposure indicated activation of the hypothalamic–pituitary–interrenal (HPI) axis. The expression levels of avtr and itr after FW transfer were increased in the pituitary on days 7 and 30. Furthermore, in situ hybridization demonstrated spatially differential expression of avt and itr transcripts in nucleus preopticus parvocellularis of pars gigantocellularis (PMgc), magnocellularis (PMmc), and parvocellularis (PMpc) of the preoptic area (POA). Positive signals for avt and it were highly abundant in PMpc after FW exposure. The data suggest involvement of neurohypophysial hormones in the brain (telencephalon and diencephalon) and pituitary for osmotic stress.

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