Increased 16 alpha-hydroxylation of estradiol in systemic lupus erythematosus - PubMed (original) (raw)
Increased 16 alpha-hydroxylation of estradiol in systemic lupus erythematosus
R G Lahita et al. J Clin Endocrinol Metab. 1981 Jul.
Abstract
Systemic lupus erythematosus (SLE) is one of many chronic diseases with a predilection for the human female. The reasons for the high female to male (9:1) incidence remain unknown. The total extent of hydroxylation estradiol at either C-16 to more estrogenic metabolites or at C-2 to the catechol estrogens was determined by a radiometric method in the human. Comparing 23 SLE patients to 44 normal controls, an increase in the extent of hydroxylation toward the 16 alpha-metabolites was found in SLE (SLE 15.2 +/- 4.3%, range 8.8-30%; normal 9.1 +/- 2.3%, range 5.3-14.4%; P less than 0.001). Increased 16 alpha-hydroxylation was found in both males (SLE 13.2 +/- 3.0%, normal 8.3 +/- 2.1%) and females (SLE 15.7 +/- 5%, normal 9.9 +/- 2.2%) with disease when compared to normal subjects. In addition, studies of several other chronic diseases by the same method did not indicate a similar alteration in 16 hydroxylation. No change in hydroxylation at C-2 was found in male patients, but a decrease was found in female patients. These data suggest that increased hydroxylation of estradiol at C-16 occurs in SLE. The 16 alpha-metabolites have been shown to be potent estrogens, and these data might give some insight into the pathogenesis of the disease.
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