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. 1984 Jun;52(2):239–246.

Hormonal influence on the secretory immune system of the eye: androgen control of secretory component production by the rat exorbital gland.

D A Sullivan, K J Bloch, M R Allansmith
PMCID: PMC1454608  PMID: 6735436

Abstract

Androgens are known to regulate the level of secretory component (SC) in tears of male rats. The purpose of the present study was to explore the underlying mechanism of this hormone action by (i) identifying the ocular tissue(s) involved in SC production; and (ii) determining whether androgens increase SC production by this tissue. We also examined whether androgen administration influenced the concentration of SC in tears of female rats. Ocular tissues from adult Sprague-Dawley rats were cultured in the presence or absence of cycloheximide in the incubation medium. Secretory component in the culture media was measured by an RIA which detects primarily free SC. Analysis of media obtained after incubation of exorbital (lacrimal) glands, 'lid' tissues, globes, and Harderian glands revealed that only exorbital glands released substantial amounts of SC. This exorbital gland production of SC, which was significantly greater in tissues from male rats, as compared to those of female rats, was reduced by approximately 50% when cycloheximide was present in the culture medium. To determine whether SC production by exorbital glands was influenced by androgens, orchiectomized glands was influenced by androgens, orchiectomized rats were administered either saline or testosterone (2.0 mg/day for 4 days), and exorbital glands were cultured 24 hr after the last injection. Testosterone treatment in vivo induced a significant, cycloheximide-sensitive increase in SC production in vitro, compared to the glandular SC output of saline-injected controls. It is interesting that similar androgen treatment of ovariectomized females also resulted in elevated tear SC concentrations and enhanced output of SC by their exorbital glands in vitro. These findings indicate that the exorbital gland is primarily responsible for SC production in the rat eye and that androgens may modulate the synthesis of SC in this gland.

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Selected References

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