Lack of involvement of arachidonic acid metabolism in chicken gonadotropin-releasing hormone II (cGnRH-II) stimulation of gonadotropin secretion in dispersed pituitary cells of goldfish, Carassius auratus. Identification of a major difference in salmon GnRH and chicken GnRH-II mechanisms of action

1991 ◽  
Vol 79 (1-3) ◽  
pp. 75-83 ◽  
Author(s):  
John P. Chang ◽  
Barbara Wildman ◽  
Frederick Van Goor
Keyword(s):  
Carassius Auratus ◽  
Acid Metabolism ◽  
Mechanisms Of Action ◽  
Arachidonic Acid Metabolism ◽  
Gonadotropin Releasing Hormone ◽  
Pituitary Cells ◽  
Gonadotropin Secretion ◽  
Goldfish Carassius Auratus ◽  
Salmon Gnrh ◽  
Stimulation Of

Effects of dexamethasone and metopirone on ovulation in the goldfish, Carassius auratus

1977 ◽  
Vol 55 (8) ◽  
pp. 1342-1350 ◽  
Author(s):  
S. Pandey ◽  
T. J. Lam ◽  
Y. Nagahama ◽  
W. S. Hoar
Keyword(s):  
Carassius Auratus ◽  
Histological Analysis ◽  
Nuclear Size ◽  
Dexamethasone Treatment ◽  
Gonadotropin Secretion ◽  
Histological Evidence ◽  
Induced Ovulation ◽  
Goldfish Carassius Auratus ◽  
Treated Fish ◽  
Stimulation Of

At 12 ± 1 °C, a temperature at which goldfish will not ovulate, metopirone induced ovulation in gravid fish. Histological analysis revealed marked stimulation of the pituitary–interrenal axis but did not reveal any change in stainability (granulation) or nuclear size of gonadotrops. It is suggested that metopirone induced ovulation in goldfish by stimulating secretion of 11-deoxycortisol and (or) 11-deoxycorticosterone. Other possibilities are discussed.When the ambient temperature was gradually raised to 20 ± 1 °C, dexamethasone treatment blocked the ovulatory response consistently seen in the saline-injected controls. However, fish injected with human chorionic gonadotropin in addition to dexamethasone ovulated like the saline-injected controls. No change in stainability (granulation) was seen in gonadotrops of dexamethasone-treated fish (20 ± 1 °C) compared to saline-injected and uninjected controls held at 12 ± 1 °C, but marked degranulation was observed in saline-injected fish warmed to 20 ± 1 °C. There appeared to be a reduction of gonadotrope nuclear size in some dexamethasone-treated fish. It is suggested that dexamethasone inhibited ovulation in goldfish by suppressing gonadotropin secretion. Action by way of suppression of corticosteriodogenesis, for which there is good histological evidence, is also discussed, as well as the possibility of direct ovarian action.

Membrane perturbation and stimulation of arachidonic acid metabolism

1982 ◽  
Vol 19 (10) ◽  
pp. 1287-1296 ◽  
Author(s):  
Diethard Gemsa ◽  
Hans-Georg Leser ◽  
Michael Seitz ◽  
Winfried Deimann ◽  
Erich Bärlin
Keyword(s):  
Arachidonic Acid ◽  
Acid Metabolism ◽  
Arachidonic Acid Metabolism ◽  
Membrane Perturbation ◽  
Stimulation Of

Substance P and astrocytes: stimulation of the cyclooxygenase pathway of arachidonic acid metabolism

1988 ◽  
Vol 2 (1) ◽  
pp. 48-51 ◽  
Author(s):  
Hans‐Peter Hartung ◽  
Kurt Heininger ◽  
Bärbel Schäfer ◽  
Klaus V. Toyka
Keyword(s):  
Arachidonic Acid ◽  
Substance P ◽  
Acid Metabolism ◽  
Arachidonic Acid Metabolism ◽  
Stimulation Of
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