Laboratory Investigation

Kidney International (1974) 5, 356–364; doi:10.1038/ki.1974.51

Experimental glomerulonephritis in the rat: structural and functional observations

Herbert Lubowitz, Debesh C Mazumdar, Juichi Kawamura, John T Crosson, Fred Weisser, Doris Rolf and Neal S Bricker

Departments of Medicine, Washington University School of Medicine-Jewish Hospitals, St. Louis, Missouri, and Albert Einstein College of Medicine, Bronx, New York, and Department of Experimental Pathology, St. John's Mercy Hospital, St. Louis, Missouri

Correspondence: Dr Herbert Lubowitz, Division of Nephrology, the Jewish Hospital of St. Louis, 216 South Kingshighway, St. Louis, Missouri 63110, U.S.A.

Received 22 February 1973; Revised 30 July 1973.

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Abstract

Experimental glomerulonephritis in the rat: structural and functional observations. In the present study, data are presented on the method of production, the morphologic characteristics and the functional patterns of experimentally induced bilateral glomerulonephritis in the rat. The histologic picture was variable. Glomerular capillary wall thickening and proliferation were both present, and a linear staining pattern was observed with immunofluorescent techniques. There was considerable diversity of anatomic involvement among the constituent glomeruli of any kidney. Functionally, total kidney glomerular filtration rate (GFR) varied from levels which were only moderately diminished to values less than 10% of normal. The animals were proteinuric and hypoalbuminemic, but the only rats in which positive sodium balance was observed were those with the lowest GFR. The morphologic heterogeneity was paralleled by a wide spread in values for single nephron GFR and proximal tubular transit times. However, values for filtration fractions and fractional sodium excretion were closely comparable in the two kidneys of individual rats; and fractional water reabsorption in superficial nephrons demonstrated a tendency for the maintenance of uniform glomerulotubular balance among the constituent nephrons.

Glomérulonéphrite expérimentale du rat: Observations concernant la structure et la fonction. Dans ce travail sont présentés le mode de production, les caractères morphologiques et les modalités fonctionnelles d'une glomérulonéphrite bilatérale expérimentale du rat. L'image histologique est variable. L'épaississement du capillaire glomérulaire et la prolifération sont tous deux présents et un dépôt linéaire a été observé au moyen de l'immunofluorescence. Il y a une diversité considérable de l'atteinte anatomique des constituants glomérulaires dans un rein. Le débit de filtration glomérulaire (GFR) du rein entier varie de valeurs à peine abaissées à moins de 10% de la normale. Les animaux sont protéinuriques et hypoalbuminémiques, mais les seuls rats dont le bilan de sodium est positif sont ceux dont les GFR sont les plus bas. L'hétérogénéité morphologique est traduite par une dispersion importante des valeurs de GFR des néphrons individuels et des temps de transit. Cependant les valeurs de la fraction filtrée et de l'excrétion fractionnelle de sodium sont très comparables pour les deux reins d'un même rat. La réabsorption fractionnelle de l'eau dans les néphrons superficiels montre une tendance au maintien d'un niveau uniforme de balance glomérulo-tubulaire dans ces divers néphrons.

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References

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