A Study on the Induction of Hardening Phenomenon by Repeated Application of Sodium Lauryl Sulfate.
- Author:
Ji Hoon CHOI
1
;
Hee Bong LEE
;
Chang Kuen PARK
;
Hee Jin CHO
;
Chun Wook PARK
;
Cheol Heon LEE
Author Information
1. Department of Dermatology, College of Medicine, Hallym University, Seoul, Korea. dermlee@yahoo.co.kr
- Publication Type:Original Article
- Keywords:
Chronic irritant contact dermatitis;
Hardening;
Sodium lauryl sulfate (SLS);
Transepidermal water loss (TEWL)
- MeSH:
Dermatitis, Contact;
Dermatitis, Occupational;
Erythema;
Forearm;
Irritants;
Organ Preservation Solutions;
Patch Tests;
Skin;
Sodium;
Sodium Dodecyl Sulfate;
Sucrose;
Water
- From:Korean Journal of Dermatology
2008;46(8):1036-1041
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Chronic irritant contact dermatitis, the common occupational dermatitis of the skin, could be caused by repetitive exposure of the skin to irritants. Adaptation of the skin to repeated influence of exogenous irritants is called the hardening. The defining characteristic of hardening phenomenon has been progressively decreasing inflammatory response with prolonged exposure to an irritant. OBJECTIVE: The purpose of this study was to evaluate the induction of hardening phenomenon by the repeated application of various concentrated sodium lauryl sulfate (SLS) solutions. METHODS: Once a day a 0.1%, 0.5%, 2% solution of SLS and distilled water were applied to the volar forearm skin in 15 healthy volunteers for 10 minutes over 3 weeks. After 3 weeks interval of rest, patch tests with 1% solution of SLS were conducted on previously irritated sites for 24 hours. We measured transepidermal water loss (TEWL) and erythema index (E-index) before irritation, during 3 weeks of repeated application. 4 days after the patches test, we measured TEWL and E-index once a day. RESULTS: During 3 weeks of irritation with repeated application of 0.1%, 0.5%, 2% SLS solution, increase of TEWL was accelerated according to concentrations of SLS. In the study of 24-h patch test with 1% SLS solution on previously irritated sites after 3 weeks interval of rest, TEWL on distilled water application site was significantly higher than other sites irritated with SLS solution on D44 and D45. The TEWL values on the site irritated with higher concentration of SLS solution were lower than those with lower concentration of SLS solution. In contrast, there were no significant differences in E-index value during 3 weeks of irritation and after 24-h patch test with 1% SLS solution. CONCLUSION: Hardening could be induced by repeated irritation with SLS solution for 3 weeks. We suggest that hardening could be induced more efficiently with the higher concentration of SLS solution than the lower concentration.
