Inter-α-trypsin inhibitor heavy chain 5 (ITIH5) is overexpressed in inflammatory skin diseases and affects epidermal morphology in constitutive knockout mice and murine 3D skin models.

Abstract:

:Inter-α-trypsin inhibitors are protease inhibitors that are thought to be important regulators in various acute-phase processes. They are composed of one light chain (bikunin) and different heavy chains (ITIHs). The only function known so far of ITIHs is the covalent linkage to hyaluronan (HA). As there is virtually no knowledge on the distribution and function of ITIH proteins in skin tissue, we performed a systematic characterization of ITIH expression in healthy and diseased skin. Using GeneChip(®) Human Exon 1.0 ST expression profiling, we found that ITIH5 represents the major ITIH family member expressed in human skin. Moreover, the use of quantitative reverse transcription PCR and a customized ITIH5-specific antibody indicated that ITIH5 is predominantly produced by dermal fibroblasts. Immunohistochemical analysis revealed a clearly detectable ITIH5 protein expression in normal skin. Interestingly, ITIH5 expression was significantly up-regulated in inflammatory skin diseases. Furthermore, 3D skin models employing murine Itih5(-/-) epidermal keratinocytes and dermal fibroblasts as well as skin specimens of Itih5(-/-) mice revealed a significantly altered epidermal structure compared to wild-type controls. Hence, we can strengthen the presumption that ITIH5 may constitute a novel regulatory molecule of the human skin that could play an important role in inflammation via its interaction with HA.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Huth S,Heise R,Vetter-Kauczok CS,Skazik C,Marquardt Y,Czaja K,Knüchel R,Merk HF,Dahl E,Baron JM

doi

10.1111/exd.12704

subject

Has Abstract

pub_date

2015-09-01 00:00:00

pages

663-8

issue

9

eissn

0906-6705

issn

1600-0625

journal_volume

24

pub_type

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