Immunomodulatory therapy of recurrent purpura associated with Sjögren's syndrome. Effect of oral gold compound.
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A 20-year-old man with acquired epidermolysis bullosa of 3 years' duration was treated intramuscularly with gold sodium thiomalate. After a total dose of 1 000 mg gold sodium thiomalate, administered over a period of 9 months, the patient has shown an almost complete remission, without any apparent side effects of the chrysotherapy.
Twenty-three patients with severe longstanding discoid lupus erythematosus, unresponsive to conventional treatments, were treated with oral gold in a multicentre open study. Nineteen patients showed clinical improvement and in four of these there was complete resolution of lesions. Adverse reactions were generally mild and self limiting.
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Fourteen of 15 patients with pemphlgus have responded successfully to systemically administered gold therapy for up to four years. Eight of the 15 (56%) are in remission, requiring no therapy (mean, 21 months). The remaining seven patients are receiving maintenance systemic gold therapy. Only one instance of toxicity was seen during maintenance therapy. The high remission rate associated with gold therapy and the infrequent side-effects during maintenance therapy suggest that systemically given gold therapy may be the treatment of choice for the management of pemphigus, following initial therapy with corticosteroids when necessary.
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Currently available techniques do not enable the clinician to identify which patients with rheumatoid arthritis will respond favorably to chrysotherapy or to predict which patients will develop gold-related complications. Gold concentrations are similar in blood, urine, feces, skin, hair and nails in gold-responders and non-responders, and in gold-toxic and non-toxic patients. However, gold toxicity is a function of dosage schedule; higher than conventional doses increase the prevalence and severity of adverse reactions. Preliminary observations suggest that the frequency of common side-effects (e.g. dermatitis, stomatitis, proteinuria) from oral gold (auranofin) is less than that incurred with intramuscular gold prepartions. The possible genetic predisposition to develop gold toxicity is under investigation.
There are contradictory reports on Interferon Gamma (IFN gamma) production by peripheral blood mononuclear cells (PBMC) in rheumatoid arthritis (RA). Since many patients previously studied were on Gold Sodium Thiomalate (GST), Auranofin (Auf), or D-Penicillamine (D-Pen) we have investigated the effects of these drugs on IFN gamma production using PBMC from normal controls (NC), and RA patients off GST, Auf, and D-Pen. Auf in low concentrations enhanced IFN gamma production by PBMC from NC but not RA; GST, and D-Pen had no effect. In other experiments PBMC were stimulated with concanavalin A (CONA A), or phytohemagglutinin (PHA). Auf, and GST inhibited IFN gamma production by CON A - stimulated NC and RA cells; D-Pen had no effect. Auf in low concentrations enhanced IFN gamma production by PHA - stimulated NC cells, but this effect was not seen with RA cells; GST inhibited both RA and NC cell production of IFN gamma, and D-Pen had no effect. Auf has a biphasic effect on IFN gamma production by NC cells with low concentrations being stimulatory or co-stimulatory, possibly by acting on T helper cells. Higher concentrations of Auf and GST, equivalent to those achieved in vivo in the course of therapy, inhibit IFN gamma production. These results suggest that gold therapy may affect IFN gamma production in RA, and could explain discrepancies noted in previous studies.
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