Journal of Clinical Endocrinology & Metabolism, Vol 76, 1002-1007, Copyright © 1993 by Endocrine Society

ARTICLES

Remission of subclinical adrenocortical failure in subjects with adrenal autoantibodies

A De Bellis, A Bizzarro, R Rossi, VA Paglionico, T Criscuolo, G Lombardi and A Bellastella
Institute of Endocrinology, First Faculty of Medicine and Surgery, University of Naples, Italy.

Idiopathic Addison's disease is a chronic organ-specific autoimmune disorder with a long subclinical period characterized only by the presence of adrenal autoantibodies (AA) with or without adrenal function failure. The aim of this longitudinal study was to evaluate the behavior of AA using, an indirect fluorescence method, and adrenal function in 20 AA-positive and 50 AA-negative patients screened by an investigation of a large population of organ-specific autoimmune disease patients without clinical Addison's disease. As controls, 100 normal age-matched subjects were tested only once. In the 20 AA- positive and 50 negative patients, AA and adrenal functional tests were evaluated every 4 months for 5 yr. The AA-positive patients were grouped into 5 adrenal functional stages, specifically: stage 0, normal adrenal function; stage 1, high PRA and low (or normal) aldosterone levels alone; stage 2, along with impaired cortisol response to ACTH, stage 3, along with increased ACTH levels; and stage 4, clinically overt Addison's disease. On the basis of the behavior of AA, the 20 positive patients were grouped as follows: group A, 11 patients with AA titer of 1:8 or higher at the first observation and persistently AA positive in subsequent observations, with titers ranging from 1:8 to 1:64; group B, 6 patients with initial AA titers of 1:8 or lower and AA disappearance in subsequent observations; and group C, 3 patients with AA titer of 1:32 or higher, undergoing corticosteroid therapy after the start of the study and showing AA disappearance in subsequent observations. With respect to adrenal function in group A, 2 patients initially in stage 1 and 1 patient initially in stage 2 did not progress to the upper stages, whereas 5 patients initially in stage 0 and 3 initially in stage 1 progressed subsequently to the upper stages, in 2 cases reaching overt clinical Addison's disease (stage 4). On the other hand, all of the patients of group B showed both a spontaneous disappearance of AA and recovery of adrenal function during the study span. Also, the 3 patients of group C showed disappearance of AA after corticosteroid therapy with recovery of adrenal function. None of the 50 patients who were initially AA negative became AA positive subsequently or showed impairment of adrenal function. We reached the following conclusions. 1) AA, even if present initially in some subjects without clinical Addison's disease, can subsequently disappear. 2) Restoration of adrenal function after disappearance of AA indicates that a spontaneous remission of subclinical adrenocortical failure can occur.(ABSTRACT TRUNCATED AT 400 WORDS)

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