Intracellular concentration of ADA2 is a marker for monocyte differentiation and activation
Peer-Reviewed Publication
Updates every hour. Last Updated: 27-Jul-2025 04:11 ET (27-Jul-2025 08:11 GMT/UTC)
Adenosine deaminase 2 (ADA2) plays a critical role in immune regulation, particularly in monocyte differentiation and activation. Unlike ADA1, which primarily functions intracellularly, ADA2 can be secreted or trafficked to lysosomes. Deficiency in ADA2 (DADA2) leads to systemic vasculitis marked by elevated TNF-α levels, excessive pro-inflammatory cytokine production, and impaired differentiation of monocytes into anti-inflammatory M2 macrophages. Research demonstrates that intracellular ADA2 localizes within endolysosomes of macrophages, and its reduction correlates with heightened TNF-α secretion. This suggests ADA2 modulates lysosomal adenosine levels, influencing inflammatory pathways. In pneumonia patients, elevated ADA2 levels in bronchoalveolar lavage (BAL) align with increased pro-inflammatory cytokines, while cord blood exhibits low ADA2, fostering an immunosuppressive milieu. Secreted ADA2 binds apoptotic cells, reducing extracellular adenosine and activating immune responses, highlighting its dual intra- and extracellular roles in inflammation.
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