Apoptosis in parathyroid hyperplasia of patients with primary or secondary uremic hyperparathyroidism.

Abstract:

BACKGROUND:Chronic oversecretion of parathyroid hormone (PTH) is associated with parathyroid hyperplasia, reflecting a disturbed balance between cell proliferation and apoptosis. This study addressed the unsolved issue of apoptosis in hyperparathyroidism. METHODS:Parathyroid glands from 19 patients with primary (1 degrees ) and 11 patients with secondary (2 degrees ) uremic hyperparathyroidism, as well as 13 normal parathyroid glands, were examined. Apoptosis was evaluated by terminal deoxynucleotidyl transferase (Tdt)-mediated dUTP nick end-labeling assay (TUNEL). Because the apoptotic process is regulated by several oncoproteins, the expression of Bcl-2 and Bax was analyzed by immunohistochemistry. RESULTS:The numbers of apoptotic cells in 1 degrees parathyroid adenoma (0.99 +/- 0.03 per 1000 cells, mean +/- SE, P < 0.009) and 2 degrees parathyroid hyperplasia (1.20 +/- 0.54 per 1000 cells, P < 0.005) were significantly higher than in normal parathyroid tissue (0.13 +/- 0. 06 per 1000 cells). Light microscopy examination of hyperplastic parathyroid tissue from a uremic patient showed the presence of nuclei with dense chromatin characteristic of apoptosis. Bcl-2 staining was strong in normal tissues but weak or negative in several sections of 1 degrees and 2 degrees hyperparathyroid tissues, mostly in nodular areas. Bax staining was homogeneous in normal tissue but patchy in several hyperplastic tissues. CONCLUSION:These results suggest that hyperparathyroidism is associated with a compensatory increase in apoptosis, possibly favored by a diminished Bcl-2/Bax ratio. This renders highly improbable the hypothesis that parathyroid hyperplasia is due to a decreased rate of apoptosis.

journal_name

Kidney Int

journal_title

Kidney international

authors

Zhang P,Duchambon P,Gogusev J,Nabarra B,Sarfati E,Bourdeau A,Drüeke TB

doi

10.1046/j.1523-1755.2000.00863.x

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

437-45

issue

2

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)46759-6

journal_volume

57

pub_type

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