Comparison of the activities of two purified fish gonadotropins on adenyl cyclase activity in the goldfish ovary

1972 ◽  
Vol 50 (12) ◽  
pp. 1673-1676 ◽  
Author(s):  
Y. A. Fontaine ◽  
C. Salmon ◽  
E. Fontaine-Bertrand ◽  
E. Burzawa-Gerard ◽  
E. M. Donaldson
Keyword(s):  
Carassius Auratus ◽  
Oncorhynchus Tshawytscha ◽  
Pacific Salmon ◽  
Adenyl Cyclase ◽  
Cyclase Activity ◽  
Adenyl Cyclase Activity ◽  
Goldfish Carassius Auratus ◽  
Maximal Stimulation ◽  
Carp Cyprinus Carpio ◽  
Stimulation Of

The pituitary gonadotropin from a Pacific salmon (Oncorhynchus tshawytscha) stimulates adenyl cyclase activity in homogenates of ovaries from goldfish (Carassius auratus) but it is about 36 times less active than carp (Cyprinus carpio) gonadotropin. Moreover, a higher maximal stimulation of the cyclase is obtained with the more homologous (carp) gonadotropin. These results suggest the existence of a partial zoological specificity of teleost gonadotropins in their stimulating action on adenyl cyclase.

Glucagon stimulation of adenyl-cyclase activity of cardiac muscle

1968 ◽  
Vol 55 (4) ◽  
pp. 181-182 ◽  
Author(s):  
Harry D. Brown ◽  
S. K. Chattopadhyay ◽  
W. S. Matthews
Keyword(s):  
Cardiac Muscle ◽  
Adenyl Cyclase ◽  
Cyclase Activity ◽  
Adenyl Cyclase Activity ◽  
Stimulation Of

Proceedings: The effects of exogenous gonadotrophins on ovarian adenyl cyclase activity

Reproduction ◽  
1974 ◽  
Vol 36 (2) ◽  
pp. 445-446
Author(s):  
C. Nugent ◽  
A Lopata ◽  
M. Gould
Keyword(s):  
Adenyl Cyclase ◽  
Cyclase Activity ◽  
Adenyl Cyclase Activity

scholarly journals CYTOCHEMICAL LOCALIZATION OF ADENYL CYCLASE ACTIVITY IN RAT ISLETS OF LANGERHANS

1972 ◽  
Vol 20 (11) ◽  
pp. 873-879 ◽  
Author(s):  
S. L. HOWELL ◽  
MARGARET WHITFIELD
Keyword(s):  
B Cells ◽  
Islets Of Langerhans ◽  
Adenosine Triphosphate ◽  
Adenyl Cyclase ◽  
Cyclase Activity ◽  
Cytochemical Localization ◽  
Adenyl Cyclase Activity ◽  
Rat Islets ◽  
Rat Islets Of Langerhans ◽  
A And B Cells

A cytochemical method has been used to investigate the localization of adenyl cyclase activity in A and B cells of isolated rat islets of Langerhans. Adenosine triphosphate was initially utilized as substrate, the pyrophosphate liberated being precipitated by lead ions at its site of production. The specificity of the method was increased by the use of adenylyl-imidodiphosphate as an alternative substrate; this adenosine triphosphate analogue was not hydrolyzed by adenosine triphosphatase but provided an effective substrate for adenyl cyclase. Adenyl cyclase activity, which was found to retain its glucagon and fluoride sensitivity in glutaraldehyde-fixed tissue, was found exclusively and almost uniformly in the plasma membranes of A and B cells. Storage granule membrane, incorporated into the plasma membrane during secretion of the granule content by exocytosis, appeared to be devoid of adenyl cyclase activity.

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