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Liu H, Qiu B, Yang H, Zheng W, Luo Y, Zhong Y, Lu P, Chen J, Luo Y, Liu J, Yang B. AHNAK, regulated by the OSM/OSMR signaling, involved in the development of primary localized cutaneous amyloidosis. J Dermatol Sci 2023:S0923-1811(23)00111-1. [PMID: 37100691 DOI: 10.1016/j.jdermsci.2023.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 04/09/2023] [Accepted: 04/13/2023] [Indexed: 04/28/2023]
Abstract
BACKGROUND Primary localized cutaneous amyloidosis (PLCA) is a chronic skin disease characterized by aberrant keratinocyte differentiation, epidermal hyperproliferation, and amyloid deposits. Previously, we demonstrated OSMR loss-function mutants enhanced basal keratinocyte differentiation through the OSMR/STAT5/KLF7 signaling in PLCA patients. OBJECTIVE To investigate the underlying mechanisms involved in basal keratinocyte proliferation in PLCA patients that remain unclear. METHODS Patients with pathologically confirmed PLCA visiting the dermatologic outpatient clinic were involved in the study. Laser capture microdissection and mass spectrometry analysis, gene-edited mice, 3D human epidermis culture, flow cytometry, western blot, qRT-PCR and RNA sequencing were used to explore the underlying molecular mechanisms. RESULTS In this study, we found that AHNAK peptide fragments were enriched in the lesions of PLCA patients, as detected by laser capture microdissection and mass spectrometry analysis. The upregulated expression of AHNAK was further confirmed using immunohistochemical staining. qRT-PCR and flow cytometry revealed that pre-treatment with OSM can inhibit AHNAK expression in HaCaT cells, NHEKs, and 3D human skin models, but OSMR knockout or OSMR mutations abolished this down-regulation trend. Similar results were obtained in wild-type and OSMR knockout mice. More importantly, EdU incorporation and FACS assays demonstrated the knockdown of AHNAK could induce G1 phase cell cycle arrest and inhibit keratinocyte proliferation. Furthermore, RNA sequencing revealed that AHNAK knockdown regulated keratinocyte differentiation. CONCLUSION Taken together, these data indicated that the elevated expression of AHNAK by OSMR mutations led to hyperproliferation and overdifferentiation of keratinocytes, and the discovered mechanism might provide insights into potential therapeutic targets for PLCA.
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Affiliation(s)
- Huiting Liu
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Biying Qiu
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Huan Yang
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Wen Zheng
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Yingying Luo
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Yadan Zhong
- Department of Dermatology, The First People's Hospital of Foshan, Foshan 528010, China
| | - Ping Lu
- Department of Science & Education, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Junyi Chen
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Ying Luo
- Department of Dermatology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China
| | - Jun Liu
- Institute of Dermatology and Venereology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China; Joint Laboratory of Dermatology Hospital, Southern Medical University and China Resources Sanjiu Medical & Pharmaceutical Co., Ltd, Guangzhou 510091, China.
| | - Bin Yang
- Department of Dermatology, Dermatology Hospital, Southern Medical University, Guangzhou 510091, China; Joint Laboratory of Dermatology Hospital, Southern Medical University and China Resources Sanjiu Medical & Pharmaceutical Co., Ltd, Guangzhou 510091, China; Guangdong-Hong Kong Joint Laboratory of Dermatology Research, Guangzhou 510091, China.
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Kobayashi K, Iwaide S, Sakai H, Kametani F, Murakami T. Keratinic amyloid deposition in canine hair follicle tumors. Vet Pathol 2023; 60:60-68. [PMID: 36219102 DOI: 10.1177/03009858221128924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Keratinic primary localized cutaneous amyloidosis is a disease in humans; however, no similar condition has been reported in animals. This study aimed to investigate cutaneous keratinic amyloid deposition in dogs and elucidate its etiology. Canine hair follicle tumor tissues were histopathologically analyzed. Immunohistochemistry and mass spectrometry-based proteomic analyses were performed to identify precursor protein candidates. Structural prediction and in vitro fibrillization analyses were conducted to determine the amyloidogenic region and gene sequencing analysis was performed to assess mutations. Of the 266 samples, 16 had amyloid deposition. Amyloid deposits were found in the stroma of tumors and in the margins of keratin debris and around normal hair follicles. Cytokeratin 5 (CK5) was identified as a precursor protein candidate. C-terminal truncation of CK5 was observed in amyloid deposits, and the truncation sites varied depending on the deposition pattern. There was a significantly higher incidence of amyloid deposition in Shiba dogs, and CK5 amino acid polymorphisms were identified in these dogs. A part of the C-terminal region of both canine and human CK5 exhibited highly amyloidogenic properties in vitro. This study revealed the existence of cutaneous keratinic amyloid deposition in animals and identified CK5 as an amyloid precursor protein, providing novel insights into understanding the etiology of cutaneous amyloidosis.
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Affiliation(s)
- Kyoko Kobayashi
- Tokyo University of Agriculture and Technology, Fuchu-shi, Japan
| | - Susumu Iwaide
- Tokyo University of Agriculture and Technology, Fuchu-shi, Japan
| | | | - Fuyuki Kametani
- Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Japan
| | - Tomoaki Murakami
- Tokyo University of Agriculture and Technology, Fuchu-shi, Japan
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