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Acute effects of removal of parathyroid adenoma on plasma and urinary hydroxyproline levels

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Abstract

This study was carried out to investigate early effects of parathyroidectomy (PTx) on bone matrix collagen metabolism. Eleven patients suffering from primary hyperparathyroidism were studied by measuring urinary excretion of hydroxyproline (OHPr) and cAMP in samples collected before PTx and, on the day of surgery, at intervals of 1–3 h for the first 10 h and then at longer intervals. In six patients nondialyzable urinary OHPr and free plasma aminoacid levels were also assayed. We found that the average period required for OHPr/Cr ratio and plasma OHPr to reach normal values was longer than the mean time required for cAMP/Cr ratio to reach normal limits. In all patients the total amount of nondialyzable OHPr decreased in the first 24 h after PTx but thereafter a daily increase in the urinary excretion of nondialyzable component was seen, so that the fractional amount of nondialyzable OHPr in the fourth postoperative day (26.8 ±5.2 SE) was significantly higher than that of preoperative one (6.1 ± 1.0; p < 0.02). Our results confirm that PTx induces a reduction in the rate of bone collagen resorption and indicate that changes of OHPr/Cr ratio and free plasma OHPr values may be considered useful indices of successful parathyroid surgery, even though they lag behind those of cAMP. The different behavior of total and nondialyzable OHPr after surgery indicates that acute deficiency of parathyroid hormone induces a positive uncoupling of the two processes of bone remodeling, thus supporting the view that the acute direct effect of the hormone on bone formation is an inhibition of this process.

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Authors and Affiliations

  1. I Semeiotica Medica, Servizio delle Malattie del Ricambio Minerale, Policlinico Umberto I, University of Roma “La Sapienza”, 00161, Roma, Italy

    S. Minisola M.D., C. Medori, R. Antonelli, A. Scarpiello, C. Valtorta, S. Tabolli, A. Scarda, G. Aliberti, E. D’Erasmo & G. F. Mazzuoli

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  1. S. Minisola M.D.
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  2. C. Medori
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  3. R. Antonelli
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  4. A. Scarpiello
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  5. C. Valtorta
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  6. S. Tabolli
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  7. A. Scarda
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  8. G. Aliberti
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  9. E. D’Erasmo
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  10. G. F. Mazzuoli
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Additional information

This work was supported by a grant from the Consiglio Nazionale delle Ricerche. The results of this study have been partly presented at the XIV Acta Endocrinologica Congress, June 1983, Stockholm, Sweden.

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Minisola, S., Medori, C., Antonelli, R. et al. Acute effects of removal of parathyroid adenoma on plasma and urinary hydroxyproline levels. J Endocrinol Invest 7, 563–568 (1984). https://doi.org/10.1007/BF03349487

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  • DOI: https://doi.org/10.1007/BF03349487

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