Biomaterial Database

Effect of hypermagnesemia on rat jejunal sodium and water transport. 1976

G F DiBona, and L L Sawin

Hypermagnesemia decreases sodium and water reabsorption in the rat renal proximal tubule. To further understand this action, the effect of hypermagnesemia on sodium and water transport in the in vivo perfused rat jejunum was studied. The rat jejunum was chosen as another transporting epithelial tissue in the same species with unidirectional sodium flux characteristics similar to the rat renal proximal tubule, i.e., leaky as opposed to tight. Hypermagnesemia decreased net jejunal sodium and water reabsorption. This decrease was due to a reduction in unidirectional sodium efflux from lumen to blood and not to an increase in unidirectional sodium influx from blood to lumen. Hypermagnesemia did not change the jejunal permeability to inulin. The effect of hypermagnesemia on jejunal sodium and water transport is similar to that renal proximal tubule sodium and water transport. This similarity suggests that the mechanism of action of magnesium of these two transporting epithelial tissues is similar.

UI	MeSH Term	Description	Entries
D007583	Jejunum	The middle portion of the SMALL INTESTINE, between DUODENUM and ILEUM. It represents about 2/5 of the remaining portion of the small intestine below duodenum.	Jejunums
D008274	Magnesium	A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION.
D005260	Female		Females
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001693	Biological Transport, Active	The movement of materials across cell membranes and epithelial layers against an electrochemical gradient, requiring the expenditure of metabolic energy.	Active Transport,Uphill Transport,Active Biological Transport,Biologic Transport, Active,Transport, Active Biological,Active Biologic Transport,Transport, Active,Transport, Active Biologic,Transport, Uphill
D012964	Sodium	A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.	Sodium Ion Level,Sodium-23,Ion Level, Sodium,Level, Sodium Ion,Sodium 23
D014867	Water	A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)	Hydrogen Oxide
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus