Abstract
We have investigated the effect of immune factors on glucose and amino acid transport by proximal tubular epithelium. Proximal tubular cells were obtained by enzymatic digestion of mouse renal cortex and grown to confluent monolayers. alpha-[14C]methylglucoside (AMG), D-[3H]-aspartate, L-[3H]leucine, and L-[3H]arginine uptake were assayed. Proximal tubular epithelium coincubated with supernatants derived from lipopolysaccharide (LPS)-stimulated mouse peritoneal macrophages had a twofold increase in AMG and aspartate uptake that was sodium dependent, was prevented by cycloheximide or actinomycin D, and was not associated with changes in cell growth or differentiation. Chromatographic separation of the macrophage supernatant yielded one fraction, mol wt 16,000-20,000, that enhanced AMG and aspartate uptake and contained interleukin 1 (IL 1) determined by bioassay. Recombinant IL 1 (mol wt 17,500) reproduced changes in AMG and aspartate uptake seen with macrophage supernatants. In contrast, neither macrophage supernatants nor IL 1 affected sodium-independent leucine or arginine transport. IL 1 directly increased 22Na transport into proximal tubular cells. These data indicate that macrophages, via IL 1 secretion, are capable of modulation of sodium-linked solute transport in proximal tubular epithelium.
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