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Protamine sulphate‐induced proteinuria: The roles of glomerular injury and depletion of polyanion

It has been claimed that intrarenal injection of polycations results in proteinuria due to neutralization of glomerular basement membrane polyanionic charge without any glomerular morphological changes. To study the effects of polycation infusion on the renal glomerulus, the left kidney of rats was directly injected with protamine sulphate through the renal artery. Urine was collected from each kidney before and after injection, and protein excretion rates were determined. Ninety minutes after completion of the injection both kidneys were perfusion‐fixed and the morphology and colloidal iron staining of the kidneys were studied by light and electron microscopy.