Abstract:
PURPOSE:Hormone diseases induce changes in the lacrimal gland (LG) and ocular surface (OS). Thyroid hormone (TH) induces cell proliferation and lipid metabolism through the activation of TH receptors. The aim of the present study was to evaluate the location and comparative expression of TH receptor beta-1 (Thrb) in LG of rats with hypothyroidism and in controls and to evaluate the impact of this disease on LG and OS structure and function. METHODS:Hypothyroidism was induced in Wistar male rats by the long-term use of tiamazole. Ten weeks later corneal cells were collected for impression cytology (IC). Rats were humanely killed, and tissues were evaluated by immunoperoxidase staining and Western blot for Thrb. The content of malondialdehyde (MDA) and acetylcholine (ACh) in LG was determined by spectrophotometry (n = 5/group in all experiments). RESULTS:LG weight was significantly lower in hypothyroid rats (P < 0.05). Western blot analysis indicated that LGs express Thrb and that hypothyroidism induces a higher expression of this receptor. IC was significantly different and ACh was significantly lower in hypothyroid rats (P < 0.05). CONCLUSIONS:Chronically reduced levels of TH lead to biochemical and structural changes and modulate the levels of Thrb in LG. These events confirm that LG is a target organ for TH and may facilitate understanding of the mechanism related to dry eye in hypothyroidism.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Dias AC,Módulo CM,Jorge AG,Braz AM,Jordão AA Jr,Filho RB,de Paula JS,Rocha EMdoi
10.1167/iovs.06-1309subject
Has Abstractpub_date
2007-07-01 00:00:00pages
3038-42issue
7eissn
0146-0404issn
1552-5783pii
48/7/3038journal_volume
48pub_type
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