Paracellin-1, a Renal Tight Junction Protein Required for Paracellular Mg2+ Resorption
DB Simon, Y Lu, KA Choate, H Velazquez… - Science, 1999 - science.org
Science, 1999•science.org
Epithelia permit selective and regulated flux from apical to basolateral surfaces by
transcellular passage through cells or paracellular flux between cells. Tight junctions
constitute the barrier to paracellular conductance; however, little is known about the specific
molecules that mediate paracellular permeabilities. Renal magnesium ion (Mg2+) resorption
occurs predominantly through a paracellular conductance in the thick ascending limb of
Henle (TAL). Here, positional cloning has identified a human gene, paracellin-1 (PCLN-1) …
transcellular passage through cells or paracellular flux between cells. Tight junctions
constitute the barrier to paracellular conductance; however, little is known about the specific
molecules that mediate paracellular permeabilities. Renal magnesium ion (Mg2+) resorption
occurs predominantly through a paracellular conductance in the thick ascending limb of
Henle (TAL). Here, positional cloning has identified a human gene, paracellin-1 (PCLN-1) …
Epithelia permit selective and regulated flux from apical to basolateral surfaces by transcellular passage through cells or paracellular flux between cells. Tight junctions constitute the barrier to paracellular conductance; however, little is known about the specific molecules that mediate paracellular permeabilities. Renal magnesium ion (Mg2+) resorption occurs predominantly through a paracellular conductance in the thick ascending limb of Henle (TAL). Here, positional cloning has identified a human gene,paracellin-1 (PCLN-1), mutations in which cause renal Mg2+ wasting. PCLN-1 is located in tight junctions of the TAL and is related to the claudin family of tight junction proteins. These findings provide insight into Mg2+homeostasis, demonstrate the role of a tight junction protein in human disease, and identify an essential component of a selective paracellular conductance.
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