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Alamri, Abdulaziz; Rahman, Rahmat; Zhang, Manli; Alamri, Abeer; Gounni, Abdelilah S; Kung, Sam K P
Frontiers in immunology, 05/2018, Letnik: 9Journal Article
Natural killer (NK) cells and dendritic cells (DCs) are two innate immune cells that are critical in regulating innate and adaptive immunity. Cellular functions and migratory responses of NK or DC can be further regulated in NK-DC crosstalk that involves multiple cytokine signals and/or direct cell-cell contacts. Semaphorin-3E (Sema-3E) is a member of a large family of Semaphorin proteins that play diverse regulatory functions in different biological systems upon its binding to the cognate receptors. However, possible role(s) of Sema-3E on the regulation of NK-cell functions has not been elucidated. Here, we first demonstrated that DC and NK cells expressed Sema-3E and its receptors, respectively. To formally address the importance of DC-derived Sema-3E in regulating NK-cell migration, we compared migratory responses of activated NK cells (aNKs) toward different conditioned media of DCs (immature, lipopolysaccharide- or Poly I:C-stimulated) derived from Sema-3E or Sema-3E mice. We observed that aNKs exhibited enhanced migrations toward the conditioned medium of the immature Sema-3E DC, when compared with that of the immature Sema-3E DC. Addition of exogenous recombinant Sema-3E to the conditioned medium of the Sema-3E immature DC (iDC) abrogated such enhanced NK-cell migration. Our current work revealed a novel role of Sema-3E in limiting NK-cell migrations toward iDC in NK-DC crosstalk.
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