The ultrastructure, catecholamine, and prolactin contents of the rostral pars distalis of the fish Mugil platanus after reserpine or 6-hydroxydopamine administration

1975 ◽  
Vol 162 (4) ◽  
Author(s):  
David Zambrano
Keyword(s):  
Pars Distalis ◽  
6 Hydroxydopamine ◽  
Rostral Pars Distalis

The effect of Ca2+ levels on in vitro prolactin release from the rostral pars distalis of coho salmon (Oncorhynchus kisutch)

1983 ◽  
Vol 61 (3) ◽  
pp. 682-684 ◽  
Author(s):  
D. J. MacDonald ◽  
B. A. McKeown
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Pars Distalis ◽  
Prolactin Release ◽  
Prolactin Synthesis ◽  
Rostral Pars Distalis

The effect of varying media Ca2+ levels on prolactin synthesis and release was investigated in vitro using the rostral pars distalis of coho salmon (Oncorhynchus kisutch). It was found that media Ca2+ is required for release and that maximum release occurred near physiological levels for plasma-ionized Ca2+ in salmonids. Both higher and lower levels of media Ca2+ were found to release less prolactin.

scholarly journals Tilapia Prolactin Cells are Thermosensitive Osmoreceptors

2021 ◽  
Author(s):  
Daniel W. Woo ◽  
G.H.T. Malintha ◽  
Fritzie T. Celino-Brady ◽  
Yoko Yamaguchi ◽  
Jason P. Breves ◽  
...  
Keyword(s):  
Channel Blocker ◽  
Water Channel ◽  
Oreochromis Mossambicus ◽  
Mrna Levels ◽  
Pars Distalis ◽  
Prolactin Cells ◽  
A Cell ◽  
Euryhaline Teleost ◽  
Dependent Pathway ◽  
Rostral Pars Distalis

Abstract Prolactin (PRL) cells within the rostral pars distalis (RPD) of the euryhaline teleost tilapia, Oreochromis mossambicus, rapidly respond to a hyposmotic stimulus by releasing two distinct PRL isoforms, PRL188 and PRL177. Here, we describe how environmentally relevant temperatures affect the release and mRNA levels of PRL188 and PRL177 from RPDs and dispersed PRL cells. When applied under isosmotic conditions (330 mOsm/kg), a 6 °C rise in temperature stimulated the release of PRL188 and PRL177 from both RPDs and dispersed PRL cells under perifusion. When exposed to this same change in temperature, ~50% of dispersed PRL cells gradually increased in volume by ~8%, a response partially inhibited by the water channel blocker, HgCl2. Following their response to increased temperature, PRL cells remained responsive to a hyposmotic stimulus (280 mOsm/kg). The mRNA expression of transient potential vanilloid 4, a Ca2+-channel involved in hyposomotically-induced PRL release, was elevated in response to a rise in temperature in dispersed PRL cells and RPDs at 6 and 24 h, respectively; prl188 and prl177 mRNAs were unaffected. Our findings indicate that thermosensitive PRL release is mediated, at least partially, through a cell-volume dependent pathway similar to how osmoreceptive PRL release is achieved.

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