Stimulation of Disaccharidase Activities in the Jejunal Brush Border Membrane of Adult Rat by Total Parenteral Nutrition

Digestion ◽  
1984 ◽  
Vol 29 (3) ◽  
pp. 190-196 ◽  
Author(s):  
Francis Raul ◽  
Michel Galluser ◽  
Michel Doffoel
Keyword(s):  
Parenteral Nutrition ◽  
Total Parenteral Nutrition ◽  
Brush Border ◽  
Brush Border Membrane ◽  
Adult Rat ◽  
Stimulation Of

Effect of chronic inflammation on electrolyte transport in rabbit ileal villus and crypt cells

1997 ◽  
Vol 272 (4) ◽  
pp. G732-G741 ◽  
Author(s):  
U. Sundaram ◽  
A. B. West
Keyword(s):  
Chronic Inflammation ◽  
Inflammatory Mediators ◽  
Brush Border ◽  
Brush Border Membrane ◽  
Basolateral Membrane ◽  
Rabbit Model ◽  
Electrolyte Transport ◽  
Acid Load ◽  
Crypt Cells ◽  
Stimulation Of

The effect of chronic inflammation on electrolyte transport in rabbit ileal villus and crypt cells was determined with the use of a rabbit model of chronic ileitis. In both cells, Na+/H+ exchange was monitored by following recovery from an acid load, and Cl-/HCO3- exchange was monitored by following recovery from an alkaline load. In villus cells, recovery from an acid load was not affected; however, recovery from an alkaline load was slowed. These data suggest that chronic inflammation inhibits Cl-/HCO3- exchange in villus cells. In contrast, in crypt cells, recovery from an alkaline load was unaffected, whereas recovery from an acid load was accelerated. These data suggest that chronic inflammation stimulates Na+/H+ exchange in crypt cells. Inhibition of Cl-/HCO3- exchange in villus cells would be expected to inhibit coupled NaCl absorption, which occurs by the coupling of brush-border membrane (BBM) Na+/H+ and Cl-/HCO3- exchange. Stimulation of Na+/H+ exchange in crypt cells, known to be present only on the basolateral membrane, alkalinizes the cell. This alkalinization may stimulate BBM Cl-/HCO3- exchange, resulting in HCO3- secretion. Thus these unique alterations in transporter activity suggest that different endogenous immune-inflammatory mediators may have differing effects on specific transporters in villus and crypt cells in the chronically inflamed ileum.

Indirect coupling of urate and p-aminohippurate transport to sodium in human brush-border membrane vesicles

1996 ◽  
Vol 270 (1) ◽  
pp. F61-F68 ◽  
Author(s):  
F. Roch-Ramel ◽  
B. Guisan ◽  
L. Schild
Keyword(s):  
Brush Border ◽  
Brush Border Membrane ◽  
Membrane Vesicles ◽  
Brush Border Membrane Vesicles ◽  
Indirect Coupling ◽  
Sodium Gradient ◽  
Beta Hydroxybutyrate ◽  
Sodium Cotransport ◽  
Stimulation Of

[14C]urate and p-[14C]aminohippurate (PAH) uptake by human brush-border membrane vesicles (BBMV) were measured in the presence of an inwardly oriented sodium gradient. No direct sodium cotransport was observed. Indirect [14C]urate coupling to sodium transport was demonstrated by cis-stimulation of [14C]urate with nicotinate or pyrazinoate (PZA) in the extravesicular medium but not by adding lactate, alpha-ketoglutarate, or beta-hydroxybutyrate. Indirect sodium coupling of [14C]PAH uptake was observed only when alpha-ketoglutarate was added to the extravesicular medium, a mechanism similar to that of basolateral membranes. The ability for PZA (and nicotinate) to cis-stimulate urate uptake was correlated with a high apparent affinity for the urate/anion exchanger. In urate-loaded vesicles, for identical medium concentrations, [14C]PZA uptake via the urateanion exchanger was 10 times higher than [14C]lactate uptake. Such high PZA affinity for the urate exchanger, working in parallel with PZA sodium cotransport can account for the stimulation of urate reabsorption by PZA in vivo.

scholarly journals Changes in intestinal absorption of nutrients and brush border glycoproteins after total parenteral nutrition in rats.

Gut ◽  
1992 ◽  
Vol 33 (4) ◽  
pp. 484-489 ◽  
Author(s):  
S Miura ◽  
S Tanaka ◽  
M Yoshioka ◽  
H Serizawa ◽  
H Tashiro ◽  
...  
Keyword(s):  
Parenteral Nutrition ◽  
Total Parenteral Nutrition ◽  
Intestinal Absorption ◽  
Brush Border

scholarly journals Study of the mechanism by which the Na+-Pi co-transporter of mouse kidney proximal-tubule cells adjusts to phosphate depletion

1988 ◽  
Vol 252 (1) ◽  
pp. 105-109 ◽  
Author(s):  
M Jahan ◽  
P J Butterworth
Keyword(s):  
Proximal Tubule ◽  
Brush Border ◽  
Brush Border Membrane ◽  
Mouse Kidney ◽  
Transport Activity ◽  
Normal Medium ◽  
Proximal Tubule Cells ◽  
Tubule Cells ◽  
Kinetic Investigations ◽  
Stimulation Of

1. Proximal-tubule cells isolated from mouse kidney after digestion with collagenase take up Pi by an Na+-dependent and saturable process mediated by the Na+-Pi co-transporter of the brush-border membrane. 2. Pi depletion of the cells is accompanied by a stimulation of Pi-transport activity. Kinetic investigations reveal that Vmax. is increased by 90% and Km decreased by 50% after Pi depletion. Transport activity returns to normal values after incubation for 30 min at 37 degrees C of Pi-depleted cells in normal medium containing 1 mM-Pi, but the fall in transport activity under these conditions is inhibited by colchicine. 3. The energy of activation of Na+-Pi co-transport activity of depleted cells differs greatly from that found for normal replete cells. 4. The results provide evidence that stimulation of transport by Pi depletion arises from an increase in the number of carrier sites in the brush-border membrane. Additionally, changes in the properties of the transporter occur which may reflect altered phospholipid-carrier-protein interaction in the Pi-depleted condition.

Brush border enzymes are differentially regulated by glucagon-like peptide 2 in the newborn pig maintained on total parenteral nutrition

2000 ◽  
Vol 118 (4) ◽  
pp. A76
Author(s):  
Yvette M. Petersen ◽  
Jan Elnif ◽  
Mette H. Schmidt ◽  
Douglas G. Burrin ◽  
Bollette Hartmann ◽  
...  
Keyword(s):  
Parenteral Nutrition ◽  
Total Parenteral Nutrition ◽  
Brush Border ◽  
Brush Border Enzymes ◽  
Glucagon Like Peptide
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