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. 1983 May;111(2):247–257.

Uptake of polyvinyl alcohol by macrophages in the glomerular mesangium of rats. Histologic and functional studies.

R B Sterzel, G M Eisenbach, M W Seiler, J R Hoyer
PMCID: PMC1916333  PMID: 6342411

Abstract

Rats received daily subcutaneous injections of the synthetic polysaccharide polyvinyl alcohol (PVA) for 1-28 days. The amount of PVA localized in the glomerular mesangium increased progressively during this time. By 28 days, all glomeruli showed extensive intracellular mesangial sequestrations of PVA, causing marked widening of mesangial areas, while the peripheral capillary loops were unaltered. Overall glomerular hypercellularity was mild to moderate, occurring mainly in areas of PVA deposition. Follow-up studies after 6, 12, 26, and 40 weeks revealed partial reduction of glomerular PVA masses. The PVA deposits were frequently associated with nonspecific esterase (NSE)-positive cells. The number of NSE-positive cells per glomerular tuft section increased from 0.1 in controls, to 2.1, 4.0, and 4.5 after 3, 14, and 28 days of PVA treatment, respectively. Similarly, glomerular counts for Ia-antigen-bearing cells rose from 2.1 in controls to 4.8 on Day 3 and showed further increases at later time periods with confluent staining of clusters of Ia-positive cells. In glomeruli, Ia-bearing cells were mainly noted in PVA-positive mesangial areas. These results indicate that PVA is taken up in the glomerulus primarily by cells that are NSE- and Ia-antigen-positive, suggesting that these cells are activated blood-borne monocyte-macrophages that sequester this polysaccharide. Clearance studies revealed that the glomerular filtration rate and effective renal plasma flow remained normal after 4 weeks of PVA injections. PVA-treated rats showed only mild elevations of urinary protein excretion. These findings indicate that confinement of marked structural and cellular alterations to the mesangium, even including the presence of infiltrating monocyte-macrophages, is compatible with absent or minimal dysfunction of the glomerular ultrafilter.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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