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Biomedical subjects

A Abuful

Publications and source records attributed to A Abuful.

4 recordsLinked to original sources

Nephrotic syndrome associated with transitional cell carcinoma of the bladder.

We describe the occurrence of a nephrotic syndrome in association with transitional cell carcinoma of the bladder. The proteinuria disappeared several weeks after removal of the tumor. Light and electron microscopy were compatible with a minimal-change lesion, but immunofluorescence showed linear immunoglobulin deposition. Immunoglobulins eluted from the tumor reacted specifically with the kidney and vice versa. We conclude that antibody formation against a specific component of basement membrane common to both kidney and tumor gave rise to the nephropathy in this case.

Biopsy↗

Active urea transport by the skin of Bufo viridis: amiloride- and phloretin-sensitive transport sites.

Urea is actively transported inwardly (Ji) across the skin of the green toad Bufo viridis. Ji is markedly enhanced in toads adapted to hypertonic saline. We studied urea transport across the skin of Bufo viridis under a variety of experimental conditions, including treatment with amiloride and phloretin, agents that inhibit urea permeability in the bladder of Bufo marinus. Amiloride (10(-4) M) significantly inhibited Ji in both adapted and unadapted animals and was unaffected by removal of sodium from the external medium. Phloretin (10(-4) M) significantly inhibited Ji in adapted animals by 23-46%; there was also a reduction in Ji in unadapted toads at 10(-4) and 5 x 10(-4) M phloretin. A dose-response study revealed that the concentration of phloretin causing half-maximal inhibition (K1/2) was 5 x 10(-4) M for adapted animals. Ji was unaffected by the substitution of sucrose for Ringer solution or by ouabain. We conclude 1) the process of adaptation appears to involve an increase in the number of amiloride- and phloretin-inhibitable urea transport sites in the skin, with a possible increase in the affinity of the sites for phloretin; 2) the adapted skin resembles the Bufo marinus urinary bladder with respect to amiloride and phloretin-inhibitable sites; 3) we confirm earlier observations that Ji is independent of sodium transport.

Amiloride↗