Importance of Water Content of the Stratum Corneum in Mouse Models for Contact Hypersensitivity  Takaaki Doi, Yoshiko Mizukawa, Yurie Shimoda, Yoshimi.

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Importance of Water Content of the Stratum Corneum in Mouse Models for Contact Hypersensitivity  Takaaki Doi, Yoshiko Mizukawa, Yurie Shimoda, Yoshimi Yamazaki, Tetsuo Shiohara  Journal of Investigative Dermatology  Volume 137, Issue 1, Pages 151-158 (January 2017) DOI: 10.1016/j.jid.2016.08.031 Copyright © 2016 The Authors Terms and Conditions

Figure 1 Mouse strain-dependent difference in SSH and TEWL levels of the ear skin in three different humidity conditions (low, intermediate, and high), and hapten-specific CHS in various genetically distinct strains of mice sensitized and elicited in intermediate humidity. (a) SSH. (b)TEWL. (c) Ear swelling. A group of mice were kept in low (<20% RH), intermediate (40–60% RH), or high (>80% RH) humidity (a, b). (c) TNCB- or OX-specific CHS in various strains. *P < 0.05, **P < 0.01, versus B6. B6, C57BL/6; CHS, contact hypersensitivity; ft/ft, flaky tail; NMU, neuromedin U; N.T., not tested; OX, 4-ethoxymetholero-2-phenyl-2-oxazoline-5-one; RH, relative humidity; SSH, skin surface hydration; TEWL, transepidermal water loss; TNCB, 2,4,6-trinitro-1-chrolobenzen. Journal of Investigative Dermatology 2017 137, 151-158DOI: (10.1016/j.jid.2016.08.031) Copyright © 2016 The Authors Terms and Conditions

Figure 2 TNCB-specific or OX-specific CHS in BALB/c, B6, ft/ft, and Nmu–/– mice elicited in high or intermediate humidity. (a) TNCB-specific CHS in BALB/c and B6 mice. (b) TNCB-specific CHS in ft/ft and B6 mice. (c) OX-specific CHS in Nmu-/- and B6 mice. These mice similarly sensitized were elicited under each condition from 1 hour before elicitation to 6 hours after elicitation. In (b), mice were used predominantly at >26 weeks of age. (d) Appearance of earlobes in BALB/c mice in intermediate (left) or high (right) humidity for 6 hours. Data (a, b, c) are expressed as the mean ± SEM (n = 3–10). *P < 0.05, **P < 0.01, B6, C57BL/6; CHS, contact hypersensitivity; ft/ft, flaky tail; NMU, neuromedin U; N.S., not significant; OX, 4-ethoxymetholero-2-phenyl-2-oxazoline-5-one; SEM, standard error of the mean; SSH, skin surface hydration; TNCB, 2,4,6-trinitro-1-chrolobenzen. Journal of Investigative Dermatology 2017 137, 151-158DOI: (10.1016/j.jid.2016.08.031) Copyright © 2016 The Authors Terms and Conditions

Figure 3 Water-soluble TNBS-specific CHS in BALB/c mice elicited in high or intermediate humidity. These mice were sensitized with 1% TNBS after tape-stripping on both sides of earlobes on day –7. No sensitized mice were left untreated except for tape-stripping. After tape-stripping, these mice thus sensitized were kept in each condition 1 hour before elicitation on day 0. Then, they were elicited with 1% TNBS under each condition during ensuing 6 hours. Data are expressed as the mean ± SEM (n = 3–4). *P < 0.01, versus sensitization/intermediate. CHS, contact hypersensitivity; SEM, standard error of the mean; SSH, skin surface hydration; TNBS, 2,4,6-trinitrobenzene sulfonic acid hydrate. Journal of Investigative Dermatology 2017 137, 151-158DOI: (10.1016/j.jid.2016.08.031) Copyright © 2016 The Authors Terms and Conditions

Figure 4 The time needed for inhibiting the ensuring CHS. B6 mice sensitized with OX were exposed to high humidity for the indicated period of time after elicitation (n = 10); they were also exposed 1 hour before elicitation. Percent CHS was calculated as follows: (CHS in high humidity during the indicated period/CHS in intermediate humidity) × 100. *P < 0.05, **P < 0.01. B6, C57BL/6; CHS, contact hypersensitivity; OX, 4-ethoxymetholero-2-phenyl-2-oxazoline-5-one. Journal of Investigative Dermatology 2017 137, 151-158DOI: (10.1016/j.jid.2016.08.031) Copyright © 2016 The Authors Terms and Conditions

Figure 5 Histopathological findings and cytokine mRNA expression of the ears at 24 hours after elicitation with OX in intermediate or high humidity in B6 mice. (a) Mice sensitized with OX on day –7 were elicited on day 0 in intermediate humidity. (b) Mice sensitized with OX were exposed to high humidity from 1 hour before to 6 hours after elicitation. Original magnification ×160, scale bar = 50 μm. (c) Numbers of histologically identifiable dermal infiltrating cells in intermediate or high humidity. (d) Mice sensitized with OX were elicited on day 0 in intermediate or high humidity. The level of mRNA expression for each cytokine is expressed as relative gene expression when the expression in the untreated B6 mice was normalized to 1.0. *P < 0.05, **P < 0.01. B6, C57BL/6; OX, 4-ethoxymetholero-2-phenyl-2-oxazoline-5-one. Journal of Investigative Dermatology 2017 137, 151-158DOI: (10.1016/j.jid.2016.08.031) Copyright © 2016 The Authors Terms and Conditions

Figure 6 Concentrations of TNCB or TNBS in the skin after a single percutaneous application of TNCB or TNBS to the ear of BALB/c mice kept in intermediate or high humidity. (a) Concentration of TNCB 24h after a single application of TNCB. (b) Concentration of TNBS at 0.5hr after a single application of TNBS. Before TNBS application, the ears of mice were tape-stripped (b). A group of mice were kept in intermediate humidity, whereas another group of mice were kept in high humidity. Data are expressed as the mean ± SEM (n = 5). *P < 0.05, **P < 0.01. SEM, standard error of the mean; TNBS, 2,4,6-trinitrobenzene sulfonic acid hydrate; TNCB, 2,4,6-trinitro-1-chrolobenzen. Journal of Investigative Dermatology 2017 137, 151-158DOI: (10.1016/j.jid.2016.08.031) Copyright © 2016 The Authors Terms and Conditions