Changes in membrane conductances and areas associated with bicarbonate secretion in turtle bladder

1990 ◽  
Vol 113 (3) ◽  
pp. 211-219 ◽  
Author(s):  
Adam Rich ◽  
Troy E. Dixon ◽  
Chris Clausen
Keyword(s):  
Bicarbonate Secretion ◽  
Membrane Conductances ◽  
Turtle Bladder

scholarly journals Energy dependence of urinary bicarbonate secretion in turtle bladder.

1975 ◽  
Vol 55 (5) ◽  
pp. 1003-1008 ◽  
Author(s):  
J A Oliver ◽  
S Himmelstein ◽  
P R Steinmetz
Keyword(s):  
Energy Dependence ◽  
Bicarbonate Secretion ◽  
Turtle Bladder

CHLORIDE REABSORPTION, BICARBONATE SECRETION AND ELECTROPHYSIOLOGICAL PARAMETERS IN THE TURTLE BLADDER

1982 ◽  
pp. 243-259 ◽  
Author(s):  
John H. Durham ◽  
Christina Matons ◽  
William A. Brodsky ◽  
Gerhardt Ehrenspeck
Keyword(s):  
Bicarbonate Secretion ◽  
Turtle Bladder

Prostaglandin E-type receptor subtypes and gastroduodenal bicarbonate secretion in rats

1998 ◽  
Vol 13 (11-s4) ◽  
pp. S221-S226
Author(s):  
KOJI TAKEUCHI ◽  
KOJI YAGI ◽  
MOTOHIRO KITAMURA ◽  
MASAFUMI KUBOMI ◽  
KIM-IHITO TASHIMA
Keyword(s):  
Prostaglandin E ◽  
Receptor Subtypes ◽  
Bicarbonate Secretion ◽  
Type Receptor

Heat stable toxin of E. coli (STa) stimulates duodenal mucosal bicarbonate secretion in cystic fibrosis knockout mice

2001 ◽  
Vol 120 (5) ◽  
pp. A137-A137
Author(s):  
D CHILDS ◽  
D CROMBIE ◽  
V PRATHA ◽  
Z SELLERS ◽  
D HOGAN ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Knockout Mice ◽  
Bicarbonate Secretion ◽  
E Coli ◽  
Heat Stable

Trypsin inhibits a chloride independent pancreatic ductal bicarbonate secretion via protease-activated receptor 2

2009 ◽  
Vol 47 (05) ◽  
Author(s):  
P Pallagi ◽  
Z Rakonczay ◽  
T Takács ◽  
V Venglovecz ◽  
J Lonovics ◽  
...  
Keyword(s):  
Bicarbonate Secretion ◽  
Protease Activated Receptor 2

Calcium transport in turtle bladder

1987 ◽  
Vol 253 (6) ◽  
pp. R917-R921
Author(s):  
S. Sabatini ◽  
N. A. Kurtzman
Keyword(s):  
Calcium Transport ◽  
Calcium Absorption ◽  
Short Circuit ◽  
Open Circuit ◽  
Calcium Flux ◽  
Bladder Epithelium ◽  
Control Value ◽  
Sodium Calcium ◽  
Turtle Bladder ◽  
Absorptive Flux

Unidirectional 45Ca fluxes were measured in the turtle bladder under open-circuit and short-circuit conditions. In the open-circuited state net calcium flux (JnetCa) was secretory (serosa to mucosa) and was 388.3 +/- 84.5 pmol.mg-1.h-1 (n = 20, P less than 0.001). Ouabain (5 X 10(-4) M) reversed JnetCa to an absorptive flux (serosal minus mucosal flux = -195.8 +/- 41.3 pmol.mg-1.h-1; n = 20, P less than 0.001). Amiloride (1 X 10(-5) M) reduced both fluxes such that JnetCa was not significantly different from zero. Removal of mucosal sodium caused net calcium absorption; removal of serosal sodium caused calcium secretion. When bladders were short circuited, JnetCa decreased to approximately one-third of control value but remained secretory (138.4 +/- 54.3 pmol.mg-1.h-1; n = 9, P less than 0.025). When ouabain was added under short-circuit conditions, JnetCa was similar in magnitude and direction to ouabain under open-circuited conditions (i.e., absorptive). Tissue 45Ca content was approximately equal to 30-fold lower when the isotope was placed in the mucosal bath, suggesting that the apical membrane is the resistance barrier to calcium transport. The results obtained in this study are best explained by postulating a Ca2+-ATPase on the serosa of the turtle bladder epithelium and a sodium-calcium antiporter on the mucosa. In this model, the energy for calcium movement would be supplied, in large part, by the Na+-K+-ATPase. By increasing cell sodium, ouabain would decrease the activity of the mucosal sodium-calcium exchanger (or reverse it), uncovering active calcium transport across the serosa.

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