Topical triiodothyronine stimulates epidermal proliferation, dermal thickening, and hair growth in mice and rats
The skin is a classic target tissue for thyroid hormone action. Although the histology of skin in hypothyroid states is well documented, the literature contains little assessment of skin in thyrotoxic states. In light of the paucity of information on skin under the influence of excess thyroid hormon...
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Published in | Thyroid (New York, N.Y.) Vol. 11; no. 8; p. 717 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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United States
01.08.2001
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Abstract | The skin is a classic target tissue for thyroid hormone action. Although the histology of skin in hypothyroid states is well documented, the literature contains little assessment of skin in thyrotoxic states. In light of the paucity of information on skin under the influence of excess thyroid hormone, we investigated the direct effect of thyroid hormone on skin. Triiodothyronine (T3) was applied topically daily in liposomes to SKH-1 hairless mice for 7 days and to CD rats for 2 weeks. There was a dose-dependent increase in epidermal proliferation, dermal thickening, and hair growth in T3-treated animals. Mice that received 3.8 microg of T3 had 42% more hairs per millimeter than controls (p < 0.01), hair length that was 1,180% longer (p < 0.001), 49% greater epidermal 3H-thymidine incorporation (p < 0.01), and 80% more 5-bromo-2'-deoxyuridine (BrdU) stained cells (p < 0.05). Rats receiving 12.8 microg T3 had 48% greater dermal thickness than controls (p < 0.001), 26% greater epidermal thickness (p < 0.001), 85% more hairs per millimeter (p < 0.005), and 130% greater 3H-thymidine incorporation into the epidermis (p < 0.01). Thus, topically applied thyroid hormone has dramatic effects on both skin and hair growth. These observations offer a new strategy for developing thyroid hormone and its analogues for treating disorders of skin and hair growth. |
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AbstractList | The skin is a classic target tissue for thyroid hormone action. Although the histology of skin in hypothyroid states is well documented, the literature contains little assessment of skin in thyrotoxic states. In light of the paucity of information on skin under the influence of excess thyroid hormone, we investigated the direct effect of thyroid hormone on skin. Triiodothyronine (T3) was applied topically daily in liposomes to SKH-1 hairless mice for 7 days and to CD rats for 2 weeks. There was a dose-dependent increase in epidermal proliferation, dermal thickening, and hair growth in T3-treated animals. Mice that received 3.8 microg of T3 had 42% more hairs per millimeter than controls (p < 0.01), hair length that was 1,180% longer (p < 0.001), 49% greater epidermal 3H-thymidine incorporation (p < 0.01), and 80% more 5-bromo-2'-deoxyuridine (BrdU) stained cells (p < 0.05). Rats receiving 12.8 microg T3 had 48% greater dermal thickness than controls (p < 0.001), 26% greater epidermal thickness (p < 0.001), 85% more hairs per millimeter (p < 0.005), and 130% greater 3H-thymidine incorporation into the epidermis (p < 0.01). Thus, topically applied thyroid hormone has dramatic effects on both skin and hair growth. These observations offer a new strategy for developing thyroid hormone and its analogues for treating disorders of skin and hair growth. |
Author | Safer, J D Holick, M F Fraser, L M Ray, S |
Author_xml | – sequence: 1 givenname: J D surname: Safer fullname: Safer, J D email: jsafer@bu.edu organization: Department of Medicine, Boston University School of Medicine, Massachusetts 02118, USA. jsafer@bu.edu – sequence: 2 givenname: L M surname: Fraser fullname: Fraser, L M – sequence: 3 givenname: S surname: Ray fullname: Ray, S – sequence: 4 givenname: M F surname: Holick fullname: Holick, M F |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/11525263$$D View this record in MEDLINE/PubMed |
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SubjectTerms | Administration, Topical Animals Dermis - drug effects Dermis - growth & development Dermis - metabolism Epidermis - drug effects Epidermis - growth & development Epidermis - metabolism Hair - drug effects Hair - growth & development Hair - metabolism Mice Mice, Hairless Rats Rats, Inbred Strains Skin - drug effects Skin - growth & development Skin - metabolism Thymidine - metabolism Thyroid Hormones - blood Triiodothyronine - administration & dosage Triiodothyronine - pharmacology |
Title | Topical triiodothyronine stimulates epidermal proliferation, dermal thickening, and hair growth in mice and rats |
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