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Zhao Q, Tominaga M, Toyama S, Komiya E, Tobita T, Morita M, Zuo Y, Honda K, Kamata Y, Takamori K. Effects of Psychological Stress on Spontaneous Itch and Mechanical Alloknesis of Atopic Dermatitis. Acta Derm Venereol 2024; 104:adv18685. [PMID: 38566405 PMCID: PMC11000660 DOI: 10.2340/actadv.v104.18685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 02/15/2024] [Indexed: 04/04/2024] Open
Abstract
Atopic dermatitis (AD), a chronic inflammatory skin disease, manifests as an intractable itch. Psychological stress has been suggested to play a role in the onset and worsening of AD symptoms. However, the pathophysiological relationships between psychological stressors and cutaneous manifestations remain unclear. To elucidate the mechanisms underlying the stress-related exacerbation of itch, we investigated the effects of water stress, restraint stress and repeated social defeat stress on itch-related scratching behaviour, mechanical alloknesis and dermatitis in male NC/Nga mice with AD-like symptoms induced by the repeated application of ointment containing Dermatophagoides farina body. NC/Nga mice with AD-like symptoms were subjected to water stress, restraint stress and repeated social defeat stress, and their scratching behaviour, sensitivity to mechanical stimuli (mechanical alloknesis) and severity of dermatitis were evaluated. Social defeat stress+ Dermatophagoides farina body-treated mice exposed to stress showed slower improvements in or the exacerbation of AD-like symptoms, including dermatitis and itch. In the mechanical alloknesis assay, the mechanical alloknesis scores of social defeat stress+ Dermatophagoides farina body-treated mice exposed to stress were significantly higher than those of non-exposed social defeat stress+ Dermatophagoides farina body- and social defeat stress-treated mice. These results suggest that psychological stress delays improvements in dermatitis by exacerbating itch hypersensitivity in AD.
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Affiliation(s)
- Qiaofeng Zhao
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Mitsutoshi Tominaga
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Sumika Toyama
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Eriko Komiya
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Tomohiro Tobita
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Motoki Morita
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Ying Zuo
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Kotaro Honda
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan
| | - Yayoi Kamata
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine. Chiba, Japan
| | - Kenji Takamori
- Juntendo Itch Research Center (JIRC), Institute for Environmental and Gender-Specific Medicine, Juntendo University Graduate School of Medicine, Chiba, Japan; Department of Dermatology, Juntendo University Urayasu Hospital, Chiba, Japan..
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Komiya E, Tominaga M, Hatano R, Kamikubo Y, Toyama S, Sakairi H, Honda K, Itoh T, Kamata Y, Tsurumachi M, Kishi R, Ohnuma K, Sakurai T, Morimoto C, Takamori K. Peripheral endomorphins drive mechanical alloknesis under the enzymatic control of CD26/DPPIV. J Allergy Clin Immunol 2021; 149:1085-1096. [PMID: 34411589 DOI: 10.1016/j.jaci.2021.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 06/29/2021] [Accepted: 08/02/2021] [Indexed: 11/18/2022]
Abstract
BACKGROUND Mechanical alloknesis (or innocuous mechanical stimuli-evoked itch) often occurs in dry skin-based disorders such as atopic dermatitis and psoriasis. However, the molecular and cellular mechanisms underlying mechanical alloknesis remain unclear. We recently reported the involvement of CD26 in the regulation of psoriatic itch. This molecule exhibits dipeptidyl peptidase IV (DPPIV) enzyme activity and exerts its biologic effects by processing various substances, including neuropeptides. OBJECTIVE The aim of the present study was to investigate the peripheral mechanisms of mechanical alloknesis by using CD26/DPPIV knockout (CD26KO) mice. METHODS We applied innocuous mechanical stimuli to CD26KO or wild-type mice. The total number of scratching responses was counted as the alloknesis score. Immunohistochemical and behavioral pharmacologic analyses were then performed to examine the physiologic activities of CD26/DPPIV or endomorphins (EMs), endogenous agonists of μ-opioid receptors. RESULTS Mechanical alloknesis was more frequent in CD26KO mice than in wild-type mice. The alloknesis score in CD26KO mice was significantly reduced by the intradermal administration of recombinant DPPIV or naloxone methiodide, a peripheral μ-opioid receptor antagonist, but not by that of mutant DPPIV without enzyme activity. EMs (EM-1 and EM-2), selective ligands for μ-opioid receptors, are substrates for DPPIV. Immunohistochemically, EMs were located in keratinocytes, fibroblasts, and peripheral sensory nerves. Behavioral analyses revealed that EMs preferentially provoked mechanical alloknesis over chemical itch. DPPIV-digested forms of EMs did not induce mechanical alloknesis. CONCLUSION The present results suggest that EMs induce mechanical alloknesis at the periphery under the enzymatic control of CD26/DPPIV.
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Affiliation(s)
- Eriko Komiya
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan
| | - Mitsutoshi Tominaga
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan; Anti-Aging Skin Research Laboratory, Graduate School of Medicine, Juntendo University, Chiba, Japan
| | - Ryo Hatano
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Yuji Kamikubo
- Department of Pharmacology, Juntendo University School of Medicine, Tokyo, Japan
| | - Sumika Toyama
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan
| | - Hakushun Sakairi
- Department of Pharmacology, Juntendo University School of Medicine, Tokyo, Japan
| | - Kotaro Honda
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan
| | - Takumi Itoh
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo, Japan; Atopy (Allergy) Research Center, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Yayoi Kamata
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan; Anti-Aging Skin Research Laboratory, Graduate School of Medicine, Juntendo University, Chiba, Japan
| | - Munehiro Tsurumachi
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan; Department of Dermatology, Juntendo University Urayasu Hospital, Chiba, Japan
| | - Ryoma Kishi
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan; Department of Dermatology, Juntendo University Urayasu Hospital, Chiba, Japan
| | - Kei Ohnuma
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Takashi Sakurai
- Department of Pharmacology, Juntendo University School of Medicine, Tokyo, Japan
| | - Chikao Morimoto
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Kenji Takamori
- Juntendo Itch Research Center, Institute for Environmental and Gender-Specific Medicine, Graduate School of Medicine, Juntendo University, Chiba, Japan; Anti-Aging Skin Research Laboratory, Graduate School of Medicine, Juntendo University, Chiba, Japan; Department of Dermatology, Juntendo University Urayasu Hospital, Chiba, Japan.
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