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Protection against minocycline pigment formation by ascorbic acid (vitamin C)
1Baylor College of Dentistry, Texas A&M University System, Dallas, USA.
Journal of Esthetic Dentistry
|January 20, 1999
Summary
Minocycline can cause dark thyroid pigmentation due to oxidation. Ascorbic acid (vitamin C) effectively prevented this minocycline-induced thyroid staining in rats, suggesting its potential therapeutic benefit.
Area of Science:
- Pharmacology
- Histology
- Biochemistry
Background:
- Minocycline, a tetracycline antibiotic, is used for acne and can cause intrinsic tissue staining.
- This staining, particularly thyroid blackening, results from an oxidation reaction.
- Ascorbic acid (vitamin C) is a known antioxidant that can inhibit pigment formation.
Purpose of the Study:
- To investigate if ascorbic acid can prevent minocycline-induced thyroid pigmentation in rats.
- To assess the efficacy of vitamin C as a preventative agent against minocycline side effects.
Main Methods:
- Rats were administered minocycline (75 mg/kg/day) for 6 weeks.
- One group received minocycline with ascorbic acid (0.1% of diet).
- Thyroid glands were histologically examined for pigment deposition.
Main Results:
- Minocycline administration led to visible darkening and black pigment deposits in rat thyroid glands.
- Rats receiving both minocycline and ascorbic acid showed no thyroid pigmentation.
- Histological findings in the minocycline + vitamin C group were indistinguishable from controls.
Conclusions:
- Ascorbic acid effectively prevents minocycline-induced thyroid pigmentation in rats.
- Long-term minocycline therapy may warrant monitoring of thyroid function.
- Further research into antioxidant co-administration for minocycline users is suggested.