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ADAMDEC1
ADAMDEC1 Full Name
ADAM-like, decysin 1
ADAMDEC1 Introduction
ADAMDEC1 (ADAM-like Decysin 1), also referred to as Decysin-1, is a distinct member of the ADAM (A Disintegrin And Metalloprotease) protein superfamily, characterized by its unique structural modifications and tissue-restricted expression pattern. Unlike canonical ADAM family members, ADAMDEC1 lacks the transmembrane and cytoplasmic domains typical of the family, classifying it as a secreted protein rather than a membrane-bound glycoprotein. Encoded by the ADAMDEC1 gene on human chromosome 8p11.21, this protein is predominantly expressed in myeloid cells – including macrophages, dendritic cells, and monocytes – with minimal to no expression in non-immune tissues, highlighting its specialized role in immune biology.The structural architecture of ADAMDEC1 deviates significantly from conventional ADAM proteins while retaining core functional domains. It contains an N-terminal signal peptide that directs secretion, a prodomain responsible for regulating enzymatic activation, and a catalytic metalloprotease domain with the conserved zinc-binding HEXXH motif essential for proteolytic activity. Notably, ADAMDEC1 lacks the disintegrin, cysteine-rich, EGF-like, transmembrane, and cytoplasmic domains found in most ADAMs. Instead, it features a unique C-terminal domain of unknown function (DUF) that distinguishes it from all other family members. Post-translational processing, including cleavage of the prodomain by furin-like proteases, is required to generate the enzymatically active form of ADAMDEC1.
Figure 1. ADAMDECI gene expression in human tissue. (Kumagai, Tomoko, 2020)
Regulation of ADAMDEC1 Expression and Activity
ADAMDEC1 expression and enzymatic activity are tightly regulated to prevent aberrant immune activation. Transcriptionally, ADAMDEC1 is induced by pro-inflammatory stimuli including lipopolysaccharide (LPS), TNF-α, and IL-1β – key mediators of innate immune responses – while anti-inflammatory cytokines such as IL-4 and IL-13 downregulate its expression. Epigenetic mechanisms, including DNA methylation and histone modification of the ADAMDEC1 promoter region, also control its cell-specific expression in myeloid cells. Post-translationally, ADAMDEC1 activity is inhibited by endogenous metalloprotease inhibitors such as TIMP-1 and TIMP-3, which bind to its catalytic domain and block proteolytic function. Additionally, oxidative stress and pH changes in the cellular microenvironment can modulate ADAMDEC1 enzymatic activity.
Physiological and Pathological Roles in Immunity and Inflammation
ADAMDEC1 plays important roles in immune regulation and inflammatory responses. It may modulate dendritic cell function and antigen presentation, potentially influencing interactions with germinal center T cells. In the intestinal mucosa, ADAMDEC1 is expressed by colonic subepithelial PDGFRα⁺ cells and has been identified as a new marker for inflammatory bowel disease (IBD). Its expression is upregulated in the inflamed mucosa of patients with IBD, suggesting a role in disease pathogenesis. Interestingly, a reduction in its normally high expression is observed within the tissue of GI inflammatory diseases and cancer, which suggests that ADAMDEC1 is likely to play a vital role in both physiology and potentially the pathogenesis of GI diseases. ADAMDEC1 has also been implicated in rheumatoid arthritis and in sarcoidosis, where its expression in bronchoalveolar lavage samples correlates with disease severity.
Alternate Names for ADAMDEC1
ADAMDEC1; ADAM-like, decysin 1; M12.219; ADAM DEC1; decysin; disintegrin protease; ADAM-like protein decysin-1; a disintegrin and metalloproteinase domain-like protein decysin-1;
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