Influence of light and darkness on secretory activity of the subcommissural organ and on growth rate of reissner's fibre in Rana esculenta L.

1973 ◽  
Vol 139 (1) ◽  
pp. 83-94 ◽  
Author(s):  
J. H. B. Diederen
Keyword(s):  
Growth Rate ◽  
Subcommissural Organ ◽  
Secretory Activity ◽  
Rana Esculenta ◽  
Reissner's Fibre

Postnatal Development of the Secretory Activity of the Goat Subcommissural Organ. A Reissner's Fibre and Angiotensin II Immunohistochemical Study

2005 ◽  
Vol 34 (4) ◽  
pp. 247-251 ◽  
Author(s):  
M. Castaneyra-Martin ◽  
E. M. Carmona-Calero ◽  
H. Perez-Gonzalez ◽  
I. Martinez-Pena y Valenzuela ◽  
C. Ormazabal-Ramos ◽  
...  
Keyword(s):  
Angiotensin Ii ◽  
Postnatal Development ◽  
Immunohistochemical Study ◽  
Subcommissural Organ ◽  
Secretory Activity ◽  
Reissner's Fibre

A new sex dimorphism in the Harderian gland of the frog Rana esculenta

2007 ◽  
Vol 85 (8) ◽  
pp. 909-915 ◽  
Author(s):  
Ismene Serino ◽  
Gaia Izzo ◽  
Diana Ferrara ◽  
Michela d’Istria ◽  
Sergio Minucci
Keyword(s):  
Sexual Dimorphism ◽  
Secretory Activity ◽  
Harderian Gland ◽  
Polymerase Chain Reaction Analysis ◽  
Rana Esculenta ◽  
Rt Pcr ◽  
Polymerase Chain ◽  
Two Peaks ◽  
Constant Expression

The Harderian gland (Hg), the only gland found in the orbit of the frog Rana esculenta L., 1758, probably plays a role in orbital lubrication. The secretory activity of the Hg is seasonal, showing the highest activity in summer. There is little information on Hg gene expression; previously, we identified a mRNA named harderin, whose deduced protein has no homology with other proteins. Differential expression of the harderin transcript between the sexes expressed during the annual cycle implies sexual dimorphism. RT–PCR (reverse transcription – polymerase chain reaction) analysis, revealed that harderin is expressed during the entire year in the Hg of both sexes. It shows a higher level of expression in the female glands than that of male glands. Two peaks of expression, in February and in June, were observed in the female glands, while only the February peak was observed in those of males. These observations were supported by in situ hybridization. Experiments involving gonadectomy and (or) hormonal replacement therapy showed a significant decrease in harderin in the Hg of females; this effect is prevented by estradiol (testosterone had no effect), while ICI (antiestrogen) counteracts the hormonal prevention, suggesting that this sexual dimorphism is under estradiol control. The constant expression of harderin mRNA during the year suggests a probable constitutive role for this molecule.

Secretory activity and serotonin innervation of subcommissural organ

Neuroreport ◽  
2000 ◽  
Vol 11 (9) ◽  
pp. 1821-1825 ◽  
Author(s):  
Samir Ahboucha ◽  
Marianne Didler-Bazes ◽  
Annie Meiniel ◽  
Michelle Fèvre-Montange ◽  
Halima Gamrani
Keyword(s):  
Subcommissural Organ ◽  
Secretory Activity

Androgen receptor in the Harderian gland of Rana esculenta

1991 ◽  
Vol 129 (2) ◽  
pp. 227-232 ◽  
Author(s):  
M. d'Istria ◽  
G. Chieffi-Baccari ◽  
L. Di Matteo ◽  
S. Minucci ◽  
B. Varriale ◽  
...  
Keyword(s):  
Androgen Receptor ◽  
Binding Capacity ◽  
Specific Binding ◽  
Secretory Activity ◽  
Harderian Gland ◽  
Nuclear Extract ◽  
Rana Esculenta ◽  
Binding Activity ◽  
Single Class ◽  
Nuclear Extracts

ABSTRACT An androgen receptor has been identified in the cytosolic and nuclear extracts of the Harderian gland of the frog, Rana esculenta. A single class of high-affinity binding sites was found: Kd = 1·9±1·3 (s.d.) nmol/l (n = 26) for the cytosolic extract and Kd = 0·9±0·8 nmol/l (n = 15) for the nuclear extract. The presence of binding activity in both nuclear and cytosolic extracts and the low rate of ligand-receptor dissociation are characteristics that distinguish this receptor from a steroid-binding protein. The Kd did not show any sex difference and did not exhibit any secretory activity-related change. Binding in both cytosolic and nuclear extracts was specific for androgens (testosterone = 5α-dihydrotestosterone); oestradiol-17β showed a 30% cross-reaction; moreover, specific binding of [3H]oestradiol-17β was not detectable. The binding capacity of the Harderian gland increased progressively in both fractions from October to December, reaching a peak in May, and decreased suddenly during July to August. The lack of any morphological sex-related difference in the Harderian gland of the green frog might be accounted for by the high amount of circulating androgens as well as a similar concentration of androgen receptor in both sexes. Journal of Endocrinology (1991) 129, 227–232

Seasonal variation in the secretory activity of the subcommissural organ (SCO) of reptiles

1996 ◽  
Vol 219 (1) ◽  
pp. 9-12 ◽  
Author(s):  
Manuel Cifuentes ◽  
Juan Pérez ◽  
Jesús M. Grondona ◽  
Pedro Fernández-Llebrez
Keyword(s):  
Seasonal Variation ◽  
Subcommissural Organ ◽  
Secretory Activity

scholarly journals Incorporation of Sulphur-35 into the Subcommissural Organ and Reissner's Fibre

Nature ◽  
1967 ◽  
Vol 216 (5114) ◽  
pp. 504-504 ◽  
Author(s):  
G. STERBA ◽  
A. ERMISCH ◽  
K. FREYER ◽  
G. HARTMANN
Keyword(s):  
Subcommissural Organ ◽  
Reissner's Fibre
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