CYCLIC AMP AND CYCLIC GMP ACCUMULATION BY ISOLATED HAMSTER GRANULOSA CELLS STIMULATED BY LH AND FSH

1978 ◽  
Vol 89 (1) ◽  
pp. 173-181 ◽  
Author(s):  
Anastasia Makris ◽  
Kenneth J. Ryan
Keyword(s):  
Cyclic Amp ◽  
Granulosa Cells ◽  
Dose Response ◽  
Cyclic Gmp ◽  
Response Relationship ◽  
Dose Response Relationship ◽  
Cyclic Amp Accumulation ◽  
Relationship Of ◽  
Higher Doses ◽  
Cyclic Amp Synthesis

ABSTRACT Cyclic AMP and cyclic GMP accumulation in hamster granulosa cells as a function of gonadotrophin dose (LH or FSH) and time (0–30 min) was determined. The pattern of acute cyclic AMP accumulation was similar in LH and FSH stimulated granulosa cells, except that the cells were more sensitive to FSH than LH. There was a positive dose response relationship of cyclic AMP accumulation in LH and FSH stimulated cells. LH appeared to partially inhibit FSH stimulated cyclic AMP synthesis. Cyclic GMP accumulation was distinctly different in LH and FSH stimulated cells. An inverse dose response relationship of cyclic GMP to dose LH was observed, with only the lowest dose of LH (0.005 IU/ml) stimulating cyclic GMP synthesis. FSH at 0.005 IU/ml did not stimulate cyclic GMP synthesis, but at higher doses generated cyclic GMP in a positive dose-related manner. The results suggest that specificity of hormone action in granulosa cells may be governed in part by differential on cyclic AMP and cyclic GMP in these cells.

CONCENTRATIONS OF CYCLIC AMP IN RABBIT OVARIAN TISSUE DURING THE PREOVULATORY PERIOD AND PSEUDOPREGNANCY AFTER INDUCTION OF OVULATION BY ADMINISTRATION OF HUMAN CHORIONIC GONADOTROPHIN

1975 ◽  
Vol 65 (1) ◽  
pp. 73-82 ◽  
Author(s):  
A. K. GOFF ◽  
PATRICIA W. MAJOR
Keyword(s):  
Cyclic Amp ◽  
Dose Response ◽  
Ovarian Tissue ◽  
Chorionic Gonadotrophin ◽  
Human Chorionic Gonadotrophin ◽  
Corpora Lutea ◽  
Response Relationship ◽  
Dose Response Relationship ◽  
Induction Of Ovulation ◽  
Relationship Of

SUMMARY Concentrations of cyclic AMP were measured in rabbit ovaries at various times after injection of an ovulatory dose of human chorionic gonadotrophin (HCG). A biphasic increase in cyclic AMP concentration occurred during the preovulatory period, with peaks 30 min and 3–4 h after HCG injection. Concentrations of cyclic AMP had returned to those observed in ovaries of control oestrous animals before the onset of ovulation 10–12 h after administration of HCG, and remained low throughout the period of pseudopregnancy. Concentrations of cyclic AMP in the newly formed and developing corpora lutea were similar to the concentrations observed in the remainder of the tissue during this period. No significant increase in cyclic AMP concentration was observed 7–9 days after initiation of ovulation. Concentrations of ATP were also investigated during the preovulatory period. The dose– response relationship of HCG to cyclic AMP production in oestrous rabbit ovaries was investigated.

CYCLIC AMP AND CYCLIC GMP ACCUMULATION IN HAMSTER PRE-OVULATORY FOLLICLES STIMULATED WITH LH AND FSH

1978 ◽  
Vol 87 (1) ◽  
pp. 158-163 ◽  
Author(s):  
Anastasia Makris ◽  
Kenneth J. Ryan
Keyword(s):  
Cyclic Amp ◽  
Dose Response ◽  
Cyclic Gmp ◽  
Time Course ◽  
Hormone Action ◽  
Acute Response ◽  
Cyclic Amp Accumulation ◽  
Ovulatory Follicles ◽  
Higher Doses

ABSTRACT Cyclic AMP and cyclic GMP accumulation in hamster pre-ovulatory follicles was determined after in vitro stimulation by LH and FSH. Combined time course and dose response experiments determined that the acute response of the follicles (0–30 min) to LH and FSH was similar with respect to cyclic AMP accumulation. The pattern of cyclic GMP accumulation was, however, distinctly different in LH and FSH stimulated follicles. LH increased follicular cyclic GMP only at the lowest dose (0.005 IU/ml), while higher doses of LH had no effect. In contrast, FSH at all doses stimulated cyclic GMP accumulation. The different cyclic AMP to cyclic relationships generated in the follicles by LH and FSH may be determinants in specificity of hormone action in pre-ovulatory follicles.

scholarly journals Secretin induces rapid increases in inositol trisphosphate, cytosolic Ca2+ and diacylglycerol as well as cyclic AMP in rat pancreatic acini

1986 ◽  
Vol 239 (2) ◽  
pp. 257-261 ◽  
Author(s):  
E R Trimble ◽  
R Bruzzone ◽  
T J Biden ◽  
R V Farese
Keyword(s):  
Cyclic Amp ◽  
Dose Response ◽  
Inositol Trisphosphate ◽  
Enzyme Secretion ◽  
Free Calcium ◽  
Response Relationship ◽  
Dose Response Relationship ◽  
Cytosolic Free Calcium ◽  
Pancreatic Acini ◽  
Cyclic Amp Accumulation

Previous studies have shown that the dose-response relationship for secretin-stimulated cyclic AMP accumulation is different from that for secretin-stimulated enzyme secretion in the rat exocrine pancreas. Here we show that secretin concentrations of 10(-10) M and higher stimulated a rise in cyclic AMP levels, with maximum effect on cyclic AMP accumulation being achieved already with 10(-8) M-secretin. However, at this concentration of secretin, enzyme secretion rates were approximately half-maximal. Unexpectedly, at concentrations of secretin greater than 10(-8) M there was evidence suggestive of phosphatidylinositol bisphosphate hydrolysis with rapid increases in inositol trisphosphate, cytosolic free calcium and diacylglycerol content of rat pancreatic acini. Furthermore, there was a dose-response relationship among secretin concentration (in the range 10(-8) M-2 × 10(-6) M), increases in inositol trisphosphate and increases in cytosolic free calcium ([Ca2+]i). Contrary to what has been previously believed, these results clearly indicate that in rat pancreatic acini secretin not only stimulates cyclic AMP accumulation but also raises inositol trisphosphate, [Ca2+]i and diacylglycerol. Thus, two second messenger systems may play a role in the regulation of secretin-induced amylase release.

Dose-Response Relationship of Inhaled Metaproterenol Sulfate in Preschool Children With Mild Asthma

PEDIATRICS ◽  
1990 ◽  
Vol 85 (6) ◽  
pp. 1072-1075
Author(s):  
Eliezer Nussbaum ◽  
Mario Eyzaguirre ◽  
Stanley P. Galant
Keyword(s):  
Preschool Children ◽  
Dose Response ◽  
Area Under The Curve ◽  
Mild Asthma ◽  
Response Relationship ◽  
Dose Response Relationship ◽  
Parallel Group ◽  
Relationship Of ◽  
Primary Variable ◽  
Higher Doses

The dose-response relationship of single doses of nebulized metaproterenol sulfate 5% inhalant solution was evaluated by placebo-controlled, parallel-group study of 30 children, aged 3 to 6 years old, with stable asthma. Total respiratory resistance, the primary variable used to assess response, was measured by the forced oscillation method for a period of 6 hours from the start of inhalation. When comparisons were made between metaproterenol sulfate and saline, only 0.01 and 0.02 mL/kg showed significant bronchodilation (P < .05) in percent change from baseline and area under the curve. However, no significant differences were seen between these doses. Moreover, the effect was sustained for 3 hours with both higher doses. Minimal side effects were observed. Metaproterenol sulfate 5% inhalant solution at a dose of 0.01 mL/kg seems to be optimal to elicit significant and sustained bronchodilatory response in preschool children with mild asthma.

Underestimation of Dose - Response Relationship with Particular Reference to the Relationship between the Dietary Intake of Mercury and its Concentration in Blood

1988 ◽  
Vol 7 (2) ◽  
pp. 129-132 ◽  
Author(s):  
J.C. Sherlock ◽  
M.J. Quinn
Keyword(s):  
Linear Regression ◽  
Dietary Intake ◽  
Dose Response ◽  
Mercury Concentration ◽  
Response Relationship ◽  
Dose Response Relationship ◽  
Blood Mercury ◽  
Relationship Of ◽  
The Relationship ◽  
Blood Mercury Concentration

Wide discrepancies have been observed between controlled and uncontrolled intake studies of the relationship of blood mercury concentration to intake of mercury. The probable reason for the apparent discrepancies is that the within-subject variation of mercury intake in the uncontrolled studies was almost certainly considerably larger than the within-subject variation in blood mercury concentration; in these circumstances, the apparent slope obtained from a linear regression of blood mercury on intake will invariably be much smaller than the true slope. Studies of the exposure or intake of any substance should therefore include a consideration of the likely within-subject variation in the exposure or intake relative to that in the effect.

A model analysis for dose–response relationship of warfarin in Japanese children: An introduction of the SIZE parameter

2016 ◽  
Vol 31 (3) ◽  
pp. 234-241 ◽  
Author(s):  
Saki Nakamura ◽  
Nao Watanabe ◽  
Naoki Yoshimura ◽  
Sayaka Ozawa ◽  
Keiichi Hirono ◽  
...  
Keyword(s):  
Dose Response ◽  
Model Analysis ◽  
Response Relationship ◽  
Size Parameter ◽  
Dose Response Relationship ◽  
Japanese Children ◽  
Relationship Of

The Dose-Response Relationship of Ondansetron in the Prophylaxis of Pediatric Postoperative Emesis

1994 ◽  
Vol 81 (SUPPLEMENT) ◽  
pp. A1351
Author(s):  
M. F. Watcha ◽  
P. J. Bras ◽  
J. Pennant ◽  
G. Cieslak ◽  
D. Burnette
Keyword(s):  
Dose Response ◽  
Response Relationship ◽  
Dose Response Relationship ◽  
Relationship Of

scholarly journals Investigations on the dose–response relationship of combined exposure to low doses of three anti-androgens in Wistar rats

2017 ◽  
Vol 91 (12) ◽  
pp. 3961-3989 ◽  
Author(s):  
Steffen Schneider ◽  
Karma C. Fussell ◽  
Stephanie Melching-Kollmuss ◽  
Roland Buesen ◽  
Sibylle Gröters ◽  
...  
Keyword(s):  
Dose Response ◽  
Wistar Rats ◽  
Low Doses ◽  
Response Relationship ◽  
Combined Exposure ◽  
Dose Response Relationship ◽  
Relationship Of
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