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- W4246070880 abstract "Investigation of immune mechanisms involved in hypertension (HTN) is one of the most emerging research area in the field. On this note, we found that hypertensive hits activate nervous system in splenic marginal zone (MZ) that represents the boundary between lymphoid white pulp and innate red pulp. The fact that both innate and adaptive immunity contribute to HTN strongly suggests that neuroimmune mechanisms couple myeloid and lymphoid cells in transducing hypertensive hits into increased blood pressure (BP). We previously showed that Placental Growth Factor (PlGF), a VEGF homolog, released in the splenic MZ upon Angiotensin II (AngII), mediates this interaction. Here we dissect the downstream pathway conveying nervous outflow into immune activation. PlGF is expected to act through its major receptor VEGFR1, its only known tyrosine kinase receptor. First we found that it is mainly expressed in splenic innate immune cells and vasculature, both in basal conditions and upon AngII. To test VEGFR1 in HTN, we challenged transgenic mice with defective VEGFR1 signaling (Flt1-TK) with AngII. To our surprise, they raised BP upon 28-days AngII as WT mice did (SBP: Flt1-TK 139±2; WT 138±2; ***p< 0.001), thus suggesting the existence of alternative pathways. PlGF may also act on a co-receptor, Neuropilin1 (Nrp1), known to enhance responses to ligands. In addition, Nrp1 has unique functions in neurons’ guidance during development and in the maturation of dendritic cells from monocytes. We found Nrp1 basally expressed and strongly increased upon AngII, especially in MZ macrophages. To test the hypothesis that PlGF/Nrp1 pathway could mediate a neuroimmune activation of dendritic cells relevant for HTN, we selectively deleted the receptor in myeloid lineage, generating Nrp1 fl;fl ;LysM-Cre transgenic mice. After assessing Nrp1deletion in splenic monocyte/macrophages by FACS, we infused AngII and found a protection from T cells costimulation and egression from the spleen. More important, they were protected from HTN (SBP: Nrp1 fl;fl ;LysM-Cre +/- 140±3; Nrp1 fl;fl ;LysM-Cre -/- 105±2; ***p< 0.001). Our data indicate a crucial role of Nrp1 in HTN, mediating non-canonical PlGF signaling in innate immunity that serves as a guidance of nerves priming adaptive immune responses." @default.
- W4246070880 created "2022-05-12" @default.
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- W4246070880 date "2017-09-01" @default.
- W4246070880 modified "2023-09-26" @default.
- W4246070880 title "Abstract 002: Neuropilin1: New Splenic Mechanisms Mediating the Guidance of Neural Cues in Immune Cells Relevant for Hypertension" @default.
- W4246070880 doi "https://doi.org/10.1161/hyp.70.suppl_1.002" @default.
- W4246070880 hasPublicationYear "2017" @default.
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