Clinical, Cosmetic and Investigational Dermatology
Open access peer-reviewed scientific and medical journals.
Dove Medical Press is now a member of the Open Access Initiative
An Author's Guide
A guide to help authors get their paper published.
Support Open Access and Dove Press
Promotional Article Monitoring - further details
Favored Author Program
Real benefits for authors, including fast-track processing of papers.
Long-term histological comparison between near-infrared irradiated skin and scar tissues
(4275) Total Article Views
Authors: Yohei Tanaka, Kiyoshi Matsuo, Shunsuke Yuzuriha
Published Date November 2010
Volume 2010:3 Pages 143 - 149
Yohei Tanaka1,2, Kiyoshi Matsuo1, Shunsuke Yuzuriha1
1Department of Plastic and Reconstructive Surgery, Shinshu University School of Medicine, Matsumoto, Japan; 2Clinica Tanaka Plastic and Reconstructive Surgery and Anti-aging Center, Matsumoto, Japan
Background and objective: Our previous histological studies indicated that near-infrared (NIR) irradiation stimulates collagen proliferation in rat and human skin for 3 months. High collagen density in the dermis and smoothing of the epidermis were observed in irradiated rat skin, and appeared to last up to 6 months. Epidermal smoothness in irradiated rat skin seems to resemble scarring. Here, we performed a long-term histological comparison between NIR (1100 to 1800 nm) irradiated skin and scar tissues.
Materials and methods: Rat skin was irradiated using a NIR device. Scar tissues were harvested from wounded areas and were compared with irradiated skin. Histological changes up to 180 days post-treatment were evaluated with hematoxylin and eosin, Azan-Mallory staining, and collagen type I and III staining.
Results: In nonirradiated control skin, the dermis showed a low density of type I and III collagen, the surface of the epidermis was rough, and no significant changes were observed over time. In irradiated skin, both type I and III collagen increased significantly, and persisted up to 180 days. The density of type I collagen was significantly higher than that of type III collagen, whereas type I and III collagen of the control group did not differ significantly. Epidermis was thickened for 30 days, and epidermal smoothness persisted up to 180 days. In scar tissues, the density of type III collagen was higher than that of type I collagen. The number of fibroblasts remained high and the glial fibrils were dense until 180 days after injury compared with irradiated skin. Significant increases in both type I and III collagen and epidermal flattering persisted until 180 days.
Conclusions: NIR irradiation induced high collagen density in the dermis, resulting in long-term epidermal smoothness without scar formation. Results indicated that NIR irradiation provides safe, consistent, and long-term effects of skin rejuvenation.
Keywords: near-infrared irradiation, long-term effects, collagen, scar, skin rejuvenation
Cannotea Citeulike Del.icio.us Facebook LinkedIn Twitter
Other articles by Dr Yohei Tanaka
Readers of this article also read:
- American Acne and Rosacea Society
The American Acne and Rosacea Society (AARS) is a 501(c)(6) non-profit organization dedicated to elevating the understanding and treatment of acne and rosacea.
- Morgellons disease: Analysis of a population with clinically confirmed microscopic subcutaneous fibers of unknown etiology
- Update on the management of chronic eczema: new approaches and emerging treatment options
- Filament formation associated with spirochetal infection: a comparative approach to Morgellons disease
- Management of superficial basal cell carcinoma: focus on imiquimod