The effects of photoperiod and temperature on the release of prolactin from the pituitary gland of the goldfish, Carassius auratus L.

1976 ◽  
Vol 54 (11) ◽  
pp. 1960-1968 ◽  
Author(s):  
B. A. McKeown ◽  
R. E. Peter
Keyword(s):  
Circadian Rhythm ◽  
Pituitary Gland ◽  
Carassius Auratus ◽  
Serum Prolactin ◽  
Prolactin Release ◽  
Temperature Conditions ◽  
Goldfish Carassius Auratus ◽  
Two Parameters ◽  
Pituitary Prolactin

A number of experiments were conducted to investigate the effects of photoperiod and temperature on prolactin release from the goldfish pituitary gland. Fish were acclimated to different photoperiods and temperatures, and also were subjected to a change in either of these two parameters after different acclimation conditions. Serum and pituitary samples were collected and analyzed by radioimmunoassay for prolactin levels. In other experiments samples for prolactin analysis were taken every 3 h intermittently over a period of 3 days from fish that were acclimated to different photoperiod and temperature conditions. Longer photoperiods and higher temperatures caused pituitary prolactin release. Serum prolactin changed on a circadian rhythm and the rhythm was modified depending on the length of the photoperiod.

Prolactin release, oestrogens and proliferation of prolactin-secreting cells in the anterior pituitary gland of adult male rats

1986 ◽  
Vol 108 (3) ◽  
pp. 399-403 ◽  
Author(s):  
R. L. Pérez ◽  
G. A. Machiavelli ◽  
M. I. Romano ◽  
J. A. Burdman
Keyword(s):  
Cell Proliferation ◽  
Pituitary Gland ◽  
Adult Male ◽  
Anterior Pituitary ◽  
Pituitary Hormones ◽  
Anterior Pituitary Gland ◽  
Male Rats ◽  
Serum Prolactin ◽  
Prolactin Release ◽  
Experimental Conditions

ABSTRACT Relationships among the release of prolactin, the effect of oestrogens and the proliferation of prolactin-secreting cells were studied under several experimental conditions. Administration of sulpiride or oestradiol released prolactin and stimulated cell proliferation in the anterior pituitary gland of adult male rats. Clomiphene completely abolished the rise in cell proliferation, but did not interfere with the sulpiride-induced release of prolactin. Treatment with oestradiol plus sulpiride significantly increased serum prolactin concentrations and the mitotic index compared with the sum of the stimulation produced by both drugs separately. Bromocriptine abolished the stimulatory effect of oestradiol on the serum prolactin concentration and on cell proliferation. In oestradiol- and/or sulpiride-treated rats, 80% of the cells in mitoses were lactotrophs. The remaining 20% did not stain with antisera against any of the pituitary hormones. The number of prolactin-secreting cells in the anterior pituitary gland significantly increased after the administration of oestradiol or sulpiride. The results demonstrate that treatment with sulpiride and/or oestradiol increases the proliferation and the number of lactotrophs in the anterior pituitary gland of the rat. J. Endocr. (1986) 108, 399–403

The oxygen consumption of goldfish (Carassius auratus L.) after removal or autotransplantation of the pituitary gland

1973 ◽  
Vol 51 (12) ◽  
pp. 1289-1291 ◽  
Author(s):  
P. H. Johansen ◽  
J. D. Gomery
Keyword(s):  
Oxygen Consumption ◽  
Pituitary Gland ◽  
Muscle Tissue ◽  
Similar Pattern ◽  
Carassius Auratus ◽  
White Muscle ◽  
Goldfish Carassius Auratus

After either pituitary removal or pituitary autotransplantation, the routine oxygen consumption of goldfish is reduced significantly from control levels. A similar pattern appears to be reflected by the oxygen consumption of white muscle tissue.

ONSET OF OESTROGEN-INDUCED PROLACTIN SECRETION AND DNA SYNTHESIS BY THE RAT PITUITARY GLAND

1977 ◽  
Vol 72 (1) ◽  
pp. 35-39 ◽  
Author(s):  
JOAN JACOBI ◽  
H. M. LLOYD ◽  
J. D. MEARES
Keyword(s):  
Dna Synthesis ◽  
Pituitary Gland ◽  
Prolactin Secretion ◽  
Male Rat ◽  
Serum Prolactin ◽  
Rat Pituitary ◽  
The Times ◽  
Pituitary Prolactin

SUMMARY The times of onset of oestrogen-induced prolactin secretion and DNA synthesis were studied in the pituitary gland of the male rat. At intervals from 3 to 96 h after injection of 10 mg diethylstilboestrol dipropionate, serum and pituitary prolactin concentrations were measured by radioimmunoassay and pituitary DNA synthesis by incorporation of [3H]thymidine in vitro. Serum prolactin was raised significantly from 6 h onwards and DNA synthesis was increased from 30 h onwards. Pituitary prolactin concentration began to increase at 30 h. Significant correlations were obtained between serum prolactin and DNA synthesis from 24 to 72 h but not during the period of prolactin secretion from 6 to 24 h.

Effect of LED light spectra on exogenous prolactin-regulated circadian rhythm in goldfish,Carassius auratus

2014 ◽  
Vol 46 (1) ◽  
pp. 121-135 ◽  
Author(s):  
Jin Ah Song ◽  
Ji Yong Choi ◽  
Na Na Kim ◽  
Young Jae Choi ◽  
Mi Ae Park ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Carassius Auratus ◽  
Led Light ◽  
Light Spectra ◽  
Goldfish Carassius Auratus

Short-Term Serum Prolactin Concentrations in Goldfish (Carassius auratus) Subjected to Serial Sampling and Restraint

1976 ◽  
Vol 33 (1) ◽  
pp. 183-186 ◽  
Author(s):  
Richard E. Spieler ◽  
Albert H. Meier
Keyword(s):  
Carassius Auratus ◽  
Marked Decrease ◽  
Circadian Variation ◽  
Serum Prolactin ◽  
Short Term ◽  
Goldfish Carassius Auratus ◽  
Serial Sampling ◽  
The Times ◽  
Initial Capture

Serum prolactin concentrations in serially sampled goldfish (Carassius auratus) did not vary significantly between 30 s and 3 min after initial capture. A marked decrease in prolactin concentration was noted 9–17 min after initial capture followed by a recovery at 30–48 min. Although there was a circadian variation in prolactin concentration, the pattern of response to capture and sampling did not vary significantly among the times tested.

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