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Mycosis fungoides and Sézary syndrome tumor cells express epidermal fatty acid‐binding protein, whose expression decreases with loss of epidermotropism
Author(s) -
TakahashiShishido Naomi,
Sugaya Makoto,
Morimura Soshi,
Suga Hiraku,
Oka Tomonori,
Kamijo Hiroaki,
Miyagaki Tomomitsu,
Sato Shinichi
Publication year - 2021
Publication title -
the journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 65
eISSN - 1346-8138
pISSN - 0385-2407
DOI - 10.1111/1346-8138.15775
Subject(s) - mycosis fungoides , immunohistochemistry , pathology , fatty acid binding protein , malignancy , psoriasis , cutaneous t cell lymphoma , staining , medicine , biology , lymphoma , immunology , gene , biochemistry
Fatty acid binding protein (FABP) is a family of transport proteins for fatty acid (FA). Epidermal FABP (E‐FABP) is highly expressed by resident memory T cells (T RM ) in the skin. It supports the uptake of exogenous FA for long‐term survival of skin T RM . Mycosis fungoides (MF) is regarded as malignancy of skin T RM . In this study, we investigated E‐FABP expression in psoriasis vulgaris (PV), atopic dermatitis (AD), MF, and Sézary syndrome (SS). E‐FABP mRNA levels in PV were much higher than those in healthy controls. E‐FABP mRNA levels in AD and MF/SS lesional skin were also significantly higher than those of normal skin. By immunohistochemical staining, E‐FABP was positive in MF/SS lesional skin. Interestingly, E‐FABP was stained positive in epidermotropic lymphoid cells in patch, plaque, and erythrodermic lesions of MF/SS, suggesting that a part of tumor cells expressed E‐FABP. In tumorous lesions, however, most dermal tumor cells were negative for E‐FABP. Immunohistochemical staining using patch/plaque lesions and tumorous lesions from the same patients also revealed that E‐FABP expression decreased in tumorous lesions. Our study has suggested that MF/SS tumor cells express E‐FABP, whose expression decreases with loss of epidermotropism.