Effect of Thyroparathyroidectomy and Parathyroidectomy on Renal Function and the Nephrotic Syndrome in Rat Nephrotoxic Serum Nephritis

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Dietary phosphorus restriction (PR) prevents uremia in rats with nephrotoxic serum nephritis (NSN). One possible mechanism by which PR could be protective would be through the suppression of parathyroid hormone. To evaluate this possibility two separate protocols were designed. In the first rats were thyroparathyroidectomized (TPTX) before (n = 11) or 5 wk after (n = 7) NSN induction and compared to sham-operated parathyroid intact rats with NSN (n = 12). At the end of the 23-wk study, intact rats were azotemic, plasma creatinine 3.80±0.81 mg/100 ml vs. 0.65±0.07 for TPTX rats (P < 0.001). During the study 75% of intact rats died of uremia in contrast to none of the TPTX rats (P < 0.001). Renal histological damage was greatly diminished and calcification prevented in TPTX rats. The proteinuria of the heterologous phase was unaffected, but the protein excretion and hypertriglyceridemia (HTG) of the autologous phase were markedly decreased in the TPTX rats. The degree of HTG and proteinuria had a high positive correlation (P < 0.001). Late TPTX also produced significant decreases in proteinuria and HTG regardless of the degree of azotemia, and prevented azotemia if the plasma creatinine at the time of TPTX was ≤0.85 mg/100 ml.

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