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This summary is machine-generated.

Sphingosine-1-phosphate receptor 2 (S1PR2) plays a key role in allergic reactions. A negative feedback loop between S1PR2 and miR-212 regulates these immune responses in vitro and in vivo.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Pharmacology

Background:

  • Rocaglamide-A (roc-A) exhibits anti-allergic effects.
  • Molecular docking suggested roc-A binds to sphingosine-1-phosphate receptor 2 (S1PR2).
  • This indicated a potential role for S1PR2 in allergic responses.

Purpose of the Study:

  • To investigate the role of S1PR2 in allergic reactions.
  • To elucidate the regulatory mechanisms involving S1PR2 and microRNA-212 (miR-212).

Main Methods:

  • Utilized rat basophilic leukemia (RBL2H3) cells and animal models of passive systemic anaphylaxis (PSA) and passive cutaneous anaphylaxis (PCA).
  • Assessed S1PR2 and CXCL1 expression via Western blotting and RT-qPCR.
  • Performed molecular docking, luciferase assays, and miR-212 mimic transfection.

Main Results:

  • Antigen stimulation increased S1PR2 expression in RBL2H3 cells; S1P also upregulated S1PR2 independently of antigen.
  • S1PR2 was essential for in vitro allergic reactions and in vivo anaphylaxis.
  • Sphingosine inhibited antigen-induced S1PR2 upregulation and allergic hallmarks, including reactive oxygen species (ROS) production.
  • CXCL1 expression increased during PSA, mediating allergic reactions.
  • TargetScan predicted miR-212 binding to S1PR2 3 ´ UTR; miR-212 mimic transfection inhibited S1PR2 and PCA.
  • S1PR2 downregulation elevated miR-212 in antigen-stimulated cells, indicating a negative feedback loop.

Conclusions:

  • S1PR2 is a critical mediator of allergic reactions.
  • A negative feedback loop between S1PR2 and miR-212 regulates allergic responses.
  • This S1PR2-miR-212 axis represents a potential therapeutic target for allergic diseases.