Transport of magnesium across an isolated preparation of sheep rumen: a comparison of MgCl2, Mg aspartate, Mg pidolate, and Mg-EDTA.
The transport of Mg across an isolated preparation of rumen epithelium of sheep was studied using different Mg salts: MgCl2. Mg aspartate, mg pidolate, and Mg-EDTA. The measurements were made under short circuit conditions in Ussing chambers. The obtained results showed that Mg transport rates did not differ significantly between MgCl2, Mg aspartate, and Mg pidolate. However, Mg-EDTA reduced Mg transport significantly and increased the short circuit current (Isc). It was shown that this increased Isc can be abolished by mucosal addition of Mg or Ca. It is concluded that Mg is transported if it is free and in the ionized form.
Leonhard
S
S
Department of Veterinary Physiology, Free University of Berlin, FRG.
Smith
E
E
Martens
H
H
Gäbel
G
G
Ganzoni
E
E
D000818:Animals; D001224:Aspartic Acid / Q000378:metabolism; D001693:Biological Transport, Active; D004492:Edetic Acid / Q000378:metabolism; D004848:Epithelium / Q000378:metabolism; D066298:In Vitro Techniques; D008274:Magnesium / Q000378:metabolism*; D015636:Magnesium Chloride / Q000378:metabolism; D011761:Pyrrolidonecarboxylic Acid / Q000378:metabolism; D012417:Rumen / Q000378:metabolism*; D012756:Sheep
D015636:Magnesium Chloride; D001224:Aspartic Acid; D004492:Edetic Acid; D008274:Magnesium; D011761:Pyrrolidonecarboxylic Acid