Heterogeneity in composition of mouse uterine natural killer cell granules

Journal of Leukocyte Biology
Patricia D A LimaAureo T Yamada

Abstract

uNK cells differ from cNK cells, as they produce angiogenic molecules critical for normal implantation site development. We evaluated heterogeneity among DBA(+)uNK cells for Prf, Gzma, and Vegfa. Ctsd and Srgn expression was used to assign intracellular sorting of these molecules on gd7, -9, and -14. Vegfa was present in small, granule-free DBA(+)uNK cells at gd7 and in large, granule-rich DBA(+)uNK cells at gd9 and -14. Prf and Gzma were only found in granulated DBA(+)uNK cells (gd9 and -14). All granule-rich Prf(+)DBA(+)uNK cells appeared to coexpress Vegfa. Thus, all DBA(+)uNK cells were Vegfa-producing cells. PC analysis and immunogold ultrastructure confirmed colocalization of Prf/Ctsd in secretory-lysosome granules (PC>0.5). Surprisingly, Gzma and Prf(+)Ctsd(+) were not colocalized (PC<0.5). Rather, Gzma colocalized with Srgn (PC>0.5) in small granules in cells with Vegfa expression (PC<0.5). NK1.1(+)sNK cells and DBA(+)uNK cells expressed genes regulating vesicular traffic (rab11, rab27a, snap23, vamp7), but uNK cells also expressed rab34 and vamp8, molecules associated with constitutive secretion. SEE activated the regulated secretory pathway of DBA(+)uNK cells in vivo, mobilizing Prf and Gzma but not Vegfa. Thus, DBA(+...Continue Reading

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Citations

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