title: Regulation of Notch 1 signaling in THP-1 cells enhances M2 macrophage differentiation.
abstract: Macrophage polarization is emerging as an important area of research for the development of novel therapeutics to treat inflammatory diseases. Within the current study, the role of Notch1R in macrophage differentiation was investigated as well as downstream effects in THP-1 monocytes cultured in "inflammation mimicry" media. Interference of Notch signaling was achieved using either the pharmaceutical inhibitor DAPT or Notch1R small interfering RNA (siRNA), and Notch1R expression, macrophage phenotypes, and anti- and proinflammatory cytokine expression were evaluated. Data presented show that Notch1R expression on M1 macrophages as well as M1 macrophage differentiation is significantly elevated during cellular stress (P < 0.05). However, under identical culture conditions, interference to Notch signaling via Notch1R inhibition mitigated these results as well as promoted M2 macrophage differentiation. Moreover, when subjected to cellular stress, macrophage secretion of proinflammatory cytokines was significantly heightened (P < 0.05). Importantly, Notch1R inhibition not only diminished proinflammatory cytokine secretion but also enhanced anti-inflammatory protein release (P < 0.05). Our data suggest that Notch1R plays a pivotal role in M1 macrophage differentiation and heightened inflammatory responses. Therefore, we conclude that inhibition of Notch1R and subsequent downstream signaling enhances monocyte to M2 polarized macrophage outcomes and promotes anti-inflammatory mediation during cellular stress.
authors.affiliation: Biomolecular Science Center, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida.
authors.forename: Reetu D
authors.initials: RD
authors.lastname: Singla
authors.affiliation: Biomolecular Science Center, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Biomolecular Science Center, Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida dsingla@ucf.edu.
authors.forename: Dinender K
authors.initials: DK
authors.lastname: Singla
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D002460:Cell Line; D016764:Cell Polarity / Q000502:physiology; D017077:Culture Media, Conditioned; D016207:Cytokines / Q000378:metabolism; D006801:Humans; D018836:Inflammation Mediators / Q000378:metabolism; D008264:Macrophages / Q000187:drug effects / Q000502:physiology*; D009000:Monocytes / Q000187:drug effects / Q000502:physiology*; D034741:RNA, Small Interfering / Q000235:genetics; D051881:Receptor, Notch1 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D017077:Culture Media, Conditioned; D016207:Cytokines; D018836:Inflammation Mediators; C497761:NOTCH1 protein, human; D034741:RNA, Small Interfering; D051881:Receptor, Notch1
keywords: Notch 1; atherosclerosis; macrophages; monocytes; polarization