Seasonal changes of the ultrastructure of the pars tuberalis of the hypophysis of Rana temporaria

1973 ◽  
Vol 145 (4) ◽  
pp. 459-469 ◽  
Author(s):  
M. P. Vandenberghe ◽  
K. Dierickx ◽  
N. Goossens
Keyword(s):  
Seasonal Changes ◽  
Rana Temporaria ◽  
Pars Tuberalis

scholarly journals Photoperiodic regulation of prolactin secretion: changes in intra-pituitary signalling and lactotroph heterogeneity

2004 ◽  
Vol 180 (3) ◽  
pp. 351-356 ◽  
Author(s):  
JD Johnston
Keyword(s):  
Environmental Conditions ◽  
Seasonal Changes ◽  
Mammalian Species ◽  
Prolactin Secretion ◽  
Day Length ◽  
Pars Tuberalis ◽  
Photoperiodic Regulation ◽  
Pituitary Lactotroph

Many mammalian species utilise day-length (photoperiod) to adapt their physiology to seasonal changes in environmental conditions, via secretion of pineal melatonin. Photoperiodic regulation of prolactin secretion is believed to occur via melatonin-mediated changes in the secretion of a putative prolactin secretagogue, tuberalin, from the pituitary pars tuberalis. Despite the in vivo and in vitro evidence in support of this intra-pituitary signalling mechanism, the identity of tuberalin has yet to be elucidated. This paper reviews recent advances in the characterisation of tuberalin and the regulation of its secretion. Furthermore, the hypothesis that pituitary lactotroph cells display heterogeneity in their response to changing photoperiod and tuberalin secretion is examined.

Seasonal changes in endocrine organs of the male common frog, Rana temporaria

1968 ◽  
Vol 91 (1) ◽  
pp. 96-111 ◽  
Author(s):  
J. A. M. Kemenade ◽  
W. J. Dongen ◽  
P. G. W. J. Oordt
Keyword(s):  
Seasonal Changes ◽  
Rana Temporaria ◽  
Common Frog ◽  
Endocrine Organs ◽  
Frog Rana Temporaria

Seasonal changes in endocrine organs of the male common frog,Rana temporaria

1968 ◽  
Vol 88 (4) ◽  
pp. 549-559 ◽  
Author(s):  
P. G. W. J. Oordt ◽  
W. J. Dongen ◽  
B. Lofts
Keyword(s):  
Seasonal Changes ◽  
Rana Temporaria ◽  
Common Frog ◽  
Endocrine Organs ◽  
Frog Rana Temporaria

The structure and vascularization of the pars tuberalis of the hypophysis of Rana temporaria

1971 ◽  
Vol 114 (1) ◽  
pp. 135-150 ◽  
Author(s):  
K. Dierickx ◽  
M. P. Lombaerts-Vandenberghe ◽  
A. Druyts
Keyword(s):  
Rana Temporaria ◽  
Pars Tuberalis
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