The corpus luteum of goldfish (Carassius auratus L.) and its functions

1975 ◽  
Vol 53 (9) ◽  
pp. 1306-1323 ◽  
Author(s):  
K. H. Khoo
Keyword(s):  
Corpus Luteum ◽  
Carassius Auratus ◽  
Complete Removal ◽  
Corpora Lutea ◽  
Follicular Cells ◽  
Adverse Conditions ◽  
Goldfish Carassius Auratus ◽  
Hydroxysteroid Dehydrogenases ◽  
Lines Of Evidence

This investigation of the role of pre- and post-ovulatory corpus luteum provided a better understanding of the various functions of follicular tissues in goldfish ovaries. When yolky oocytes become atretic, either naturally or under adverse conditions, the granulosa cells hypertrophy and serve a phagocytic function. This is evident in the α and β stages of the preovulatory corpus luteum. In addition to the removal of atretic oocytes, the follicular cells are involved in steroidogenesis, as demonstrated by the detection of hydroxysteroid dehydrogenases in the granulosa of normal oocytes and the corpus luteum, both pre- and post-ovulatory. In the preovulatory corpus luteum the steroidogenic function was evident only after the complete removal of the atretic oocyte. Hence, steroidogenesis was observed only in the γ stage preovulatory corpus luteum. In the postovulatory follicles, steroidogenesis was evident immediately after ovulation. It is postulated that the steroid hormones synthesized by the pre- and post-ovulatory corpus luteum induced some of the corpora lutea cells to differentiate into oogonia. There are two major lines of evidence, one histological and the other from autoradiography, which suggest that corpora lutea cells ultimately differentiate into oogonia.

Role of apoptosis, apoptosis-related factors and 17β-hydroxysteroid dehydrogenases in human corpus luteum regression

2002 ◽  
Vol 194 (1-2) ◽  
pp. 191-200 ◽  
Author(s):  
Tommi E Vaskivuo ◽  
Ulrika Ottander ◽  
Olayiwola Oduwole ◽  
Veli Isomaa ◽  
Pirkko Vihko ◽  
...  
Keyword(s):  
Corpus Luteum ◽  
Related Factors ◽  
Hydroxysteroid Dehydrogenases ◽  
Human Corpus Luteum

The role of telencephalic NO and cGMP in avoidance conditioning in goldfish (Carassius auratus).

2009 ◽  
Vol 123 (3) ◽  
pp. 614-623 ◽  
Author(s):  
Xiaojuan Xu ◽  
Jordan Bentley ◽  
Todd Miller ◽  
Katherine Zmolek ◽  
Travis Kovaleinen ◽  
...  
Keyword(s):  
Avoidance Conditioning ◽  
Carassius Auratus ◽  
Goldfish Carassius Auratus

THE ROLE OF THE PITUITARY IN THE RESISTANCE OF THE GOLDFISH (CARASSIUS AURATUS L.) TO A HIGH TEMPERATURE

1967 ◽  
Vol 45 (3) ◽  
pp. 329-345 ◽  
Author(s):  
Peter H. Johansen
Keyword(s):  
High Temperature ◽  
Heat Resistance ◽  
Carassius Auratus ◽  
Essential Role ◽  
High Temperature Stress ◽  
Heat Resistant ◽  
Goldfish Carassius Auratus ◽  
Normal Fish ◽  
Resistance Tests

The heat resistance of normal, hypophysectomized and pituitary-autotransplanted goldfish acclimated to 20 °C under 16-h photoperiod and 8-h photoperiod conditions was determined. It was found that hypophysectomized goldfish were less heat resistant than normal fish and that those with an autotransplanted pituitary were as heat resistant as normal fish.The photoperiod results, though inconclusive, suggest that normal 16-h photoperiod fish are more heat resistant than normal 8-h photoperiod fish and that only the fish with a normal pituitary can respond to photoperiod changes. The fish without a pituitary are slightly less heat resistant than normal 8-h-photoperiod fish, while those possessing an autotransplanted pituitary are as resistant to a high temperature as normal 16-h-photo period fish.Treatment of hypophysectomized goldfish with luteinizing, thyrotropic, adrenocorticotropic, and lactotropic (prolactin) hormones and crude salmon pituitary extract appeared not to affect resistance to a high temperature.In the experiments involving pituitary autotransplantation, a study was made of various organs influenced by pituitary secretions to determine the pattern of hormone output by the pituitary. By contrasting this information with that of the heat resistance tests, various hormones have been suggested as not playing an essential role in high temperature resistance. The hypothesis is put forward that a prolactin-like hormone plays the essential role in resisting a high-temperature stress.

scholarly journals Role of the Pituitary Gland in Melanization in the Skin of the Goldfish, Carassius auratus, Induced by X-ray Irradiation

1962 ◽  
Vol 38 (7) ◽  
pp. 345-347 ◽  
Author(s):  
Nobuo EGAMI ◽  
Hisami ETOH ◽  
Chikashi TACHI ◽  
Kazuko AOKI ◽  
Ryoichi ARAI
Keyword(s):  
Pituitary Gland ◽  
Carassius Auratus ◽  
X Ray ◽  
Goldfish Carassius Auratus

scholarly journals Interaction of Mouse Placental Lactogens and Androgens in Regulating Progesterone Release in Cultured Mouse Luteal Cells

Endocrinology ◽  
1997 ◽  
Vol 138 (8) ◽  
pp. 3236-3241 ◽  
Author(s):  
G. Thordarson ◽  
S. Galosy ◽  
G. O. Gudmundsson ◽  
B. Newcomer ◽  
R. Sridaran ◽  
...  
Keyword(s):  
Androgen Receptor ◽  
Corpus Luteum ◽  
De Novo ◽  
Pituitary Hormones ◽  
Pregnant Mouse ◽  
Placental Lactogen ◽  
Luteal Cell ◽  
Corpora Lutea ◽  
Luteal Cells

Abstract Pituitary hormones are essential for the maintenance of the corpus luteum in the pregnant mouse during the first half of gestation. Thereafter, hormones from the placenta take over the luteotropic role of the pituitary hormones. Mouse placental lactogen-I (mPL-I) and mPL-II, two PRL-like hormones produced in the placenta, are probably necessary for the maintenance of the corpus luteum in the latter half of pregnancy. A culture system of luteal cells from pregnant mice was developed to investigate the role of hormones from the placenta that may be important for the function of the corpus luteum. Mice were killed on days 10, 14, and 18 of pregnancy, and the corpora lutea were excised from the ovaries and digested in 0.1% collagenase, 0.002% DNase for 1 h. The resulting luteal cell suspension was plated onto 96-well plates coated with fibronectin (1 × 105 cells/well) and cultured for 1–3 days. Medium was changed daily. The cells were treated with various concentrations and combinations of mPL-I, mPL-II, mouse PRL, androstenedione, dihydrotestosterone, 17β-estradiol (E2), testosterone, hydroxyflutamide, cycloheximide, actinomycin D, and fadrozole to study the effects of these different treatments on progesterone (P4) production. The three lactogens (mPL-I, mPL-II, and mouse PRL) all stimulated the release of P4 from the luteal cells. The potency of the lactogens was similar and did not depend on the stage of pregnancy at which the luteal tissue was obtained. However, the responsiveness of the cells to all hormone-stimulated P4 release was gradually reduced the later in pregnancy the tissue was collected. Androgens also stimulated the release of P4 from the luteal cells, and when administered together, the lactogens and the androgens acted synergistically to stimulate P4 release. The androgens acted directly but not through conversion to E2, as determined by the findings that 1) the effects of the androgens could not be reproduced by E2 administration, 2) nonaromatizable androgen dihydrotestosterone was as effective as aromatizable androgens, and 3) aromatase inhibitor did not prevent the action of the androgens to stimulate the P4 release. The effect of the androgens on the P4 release was rapid, occurring within 15 min of hormone administration. It was not prevented by inhibitors of protein and RNA synthesis, and the intracellular androgen receptor antagonist hydroxyflutamide did not affect the androgen action. Therefore, the androgen effects were not mediated through the intracellular androgen receptor and de novo protein synthesis was not needed for androgen-stimulated P4 release.

A non-histological method for determining the completeness of hypophysectomy in the goldfish (Carassius auratus)

1969 ◽  
Vol 47 (4) ◽  
pp. 324-325 ◽  
Author(s):  
P. H. Johansen ◽  
A. W. Roy
Keyword(s):  
Pituitary Gland ◽  
Carassius Auratus ◽  
Complete Removal ◽  
Goldfish Carassius Auratus ◽  
Histological Method

Experiments show that the loss of fin color of the goldfish correlates perfectly with the complete removal of the pituitary gland, and this color loss can be used as a criterion for determining the completeness of hypophysectomy.

scholarly journals Neuromediator bioamines in the histogenesis of corpora lutea

1994 ◽  
Vol 40 (5) ◽  
pp. 44-46
Author(s):  
Yu. V. Pogorelov ◽  
S. V. Dindyayev
Keyword(s):  
Corpus Luteum ◽  
Histochemical Method ◽  
Corpora Lutea ◽  
Progesterone Synthesis

The role of neuromediator bioamines in histogenesis of corpora lutea was under study. Cryostate slices of ovaries from 27 cats were treated after A. Bjorklunds fluorescent histochemical method modified by V. N. Shvalev and N. I. Zhuchkova. The content of serotonin and catecholamines was measured cytospectrofluorometrically in varicose dilatations and intervari- cose sites о perivascular plexuses and terminals, in membranous and parenchymatous macrophages of corpus luteum. A reliably increased content of the examined neuromediators was found in all the tested nervous structures at the stage of glandular metamorphosis and corpus luteum maturity. Serotonin and catecholamines are believed to be needed for glandular metamorphosis and corpus luteum maturation. A higher level of catecholamines at the stage of corpora lutea maturity in comparison with serotonin may be explained by an activating effect of these neuromediators on progesterone synthesis. Catecholamines may be necessary for luteolythic action of prostaglandines. Macrophages seem to inactivate mediator excess.

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