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Abstract
Glucose is converted to sorbitol and then to fructose via the polyol pathway that
has been implicated in the pathogenesis of organ damage. The contribution of the polyol
pathway to mesothelial cell activation has, however, not been fully determined.
The effect of increasing glucose concentrations on transforming growth factor-beta
1 (TGF-beta 1) and monocyte chemoattractant protein-1 (MCP-1) secretion by human peritoneal
mesothelial cells (HPMC) was examined. The importance of the polyol pathway was identified
by its specific inhibition with an aldose reductase inhibitor.
Incubation of HPMC with 5 to 100 mmol/L glucose resulted in an induction of aldose
reductase mRNA and intracellular sorbitol accumulation accompanied by the induction
of TGF-beta 1 and MCP-1 mRNA expression and protein secretion. Mannitol at the same
concentrations also induced aldose reductase, TGF-beta 1 and MCP-1 mRNA and protein
expression but at a lower level than glucose. Sorbinil dose-dependently reduced both
intracellular sorbitol levels (79.8% reduction of 60 mmol/L D-glucose induced intracellular
sorbitol with 100 micromol/L sorbinil (N = 3, P < 0.01) and glucose-induced TGF-beta
1 and MCP-1 secretion. Mannitol induced TGF-beta 1 and MCP-1 secretion was not reduced
by sorbinil. The addition of 15 to 40 mmol/L sodium lactate, either alone or in the
presence of D-glucose enhanced TGF-beta 1 and MCP-1 secretion, which was inhibited
by sorbinil. In contrast, sodium pyruvate appeared to antagonize D-glucose-induced
TGF-beta 1 and MCP-1 secretion.
These data suggest that the polyol pathway and osmolality contribute to the regulation
of HPMC function by glucose. Control of polyol pathway activation might reduce glucose-mediated
damage to the peritoneal membrane and promote its long-term survival.