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Colony-stimulating factor-1 signaling suppresses renal crystal formation.

ABSTRACT: We recently reported evidence suggesting that migrating macrophages (M?s) eliminate renal crystals in hyperoxaluric mice. M?s can be inflammatory (M1) or anti-inflammatory (M2), and colony-stimulating factor-1 (CSF-1) mediates polarization to the M2M? phenotype. M2M?s promote renal tissue repair and regeneration, but it is not clear whether these cells are involved in suppressing renal crystal formation. We investigated the role of M2M?s in renal crystal formation during hyperoxaluria using CSF-1-deficient mice, which lack M2M?s. Compared with wild-type mice, CSF-1-deficient mice had significantly higher amounts of renal calcium oxalate crystal deposition. Treatment with recombinant human CSF-1 increased the expression of M2-related genes and markedly decreased the number of renal crystals in both CSF-1-deficient and wild-type mice. Flow cytometry of sorted renal M?s showed that CSF-1 deficiency resulted in a smaller population of CD11b(+)F4/80(+)CD163(+)CD206(hi) cells, which represent M2-like M?s. Additionally, transfusion of M2M?s into CSF-1-deficient mice suppressed renal crystal deposition. In vitro phagocytosis assays with calcium oxalate monohydrate crystals showed a higher rate of crystal phagocytosis by M2-polarized M?s than M1-polarized M?s or renal tubular cells. Gene array profiling showed that CSF-1 deficiency resulted in disordered M2- and stone-related gene expressions. Collectively, our results provide compelling evidence for a suppressive role of CSF-1 signaling in renal crystal formation.

SUBMITTER: Taguchi K

PROVIDER: S-EPMC4116057 | biostudies-literature | 2014 Aug

REPOSITORIES: biostudies-literature

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Colony-stimulating factor-1 signaling suppresses renal crystal formation.

Taguchi Kazumi K Okada Atsushi A Kitamura Hiroshi H Yasui Takahiro T Naiki Taku T Hamamoto Shuzo S Ando Ryosuke R Mizuno Kentaro K Kawai Noriyasu N Tozawa Keiichi K Asano Kenichi K Tanaka Masato M Miyoshi Ichiro I Kohri Kenjiro K

Journal of the American Society of Nephrology : JASN 20140227 8

We recently reported evidence suggesting that migrating macrophages (Mϕs) eliminate renal crystals in hyperoxaluric mice. Mϕs can be inflammatory (M1) or anti-inflammatory (M2), and colony-stimulating factor-1 (CSF-1) mediates polarization to the M2Mϕ phenotype. M2Mϕs promote renal tissue repair and regeneration, but it is not clear whether these cells are involved in suppressing renal crystal formation. We investigated the role of M2Mϕs in renal crystal formation during hyperoxaluria using CSF- ...[more]

PMID: 24578130

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Project description:BACKGROUND:Granulocyte colony-stimulating factor (G-CSF) can increase populations of myeloid-derived suppressor cells, innate immune suppressors that play an immunoregulatory role in antitumor immunity. However, the roles of myeloid-derived suppressor cells and G-CSF in renal ischemia-reperfusion injury remain unclear. METHODS:We used mouse models of ischemia-reperfusion injury to investigate whether G-CSF can attenuate renal injury by increasing infiltration of myeloid-derived suppressor cells into kidney tissue. RESULTS:G-CSF treatment before ischemia-reperfusion injury subsequently attenuated acute renal dysfunction, tissue injury, and tubular apoptosis. Additionally, G-CSF treatment suppressed renal infiltration of macrophages and T cells as well as renal levels of IL-6, MCP-1, IL-12, TNF-α, and IFN-γ, but it increased levels of IL-10, arginase-1, and reactive oxygen species. Moreover, administering G-CSF after ischemia-reperfusion injury improved the recovery of renal function and attenuated renal fibrosis on day 28. G-CSF treatment increased renal infiltration of myeloid-derived suppressor cells (F4/80-CD11b+Gr-1int), especially the granulocytic myeloid-derived suppressor cell population (CD11b+Ly6GintLy6Clow); splenic F4/80-CD11b+Gr-1+ cells sorted from G-CSF-treated mice displayed higher levels of arginase-1, IL-10, and reactive oxygen species relative to those from control mice. Furthermore, these splenic cells effectively suppressed in vitro T cell activation mainly through arginase-1 and reactive oxygen species, and their adoptive transfer attenuated renal injury. Combined treatment with anti-Gr-1 and G-CSF showed better renoprotective effects than G-CSF alone, whereas preferential depletion of myeloid-derived suppressor cells by pep-G3 or gemcitabine abrogated the beneficial effects of G-CSF against renal injury. CONCLUSIONS:G-CSF induced renal myeloid-derived suppressor cells, thereby attenuating acute renal injury and chronic renal fibrosis after ischemia-reperfusion injury. These results suggest therapeutic potential of myeloid-derived suppressor cells and G-CSF in renal ischemia-reperfusion injury.

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Colony-stimulating factor-1 signaling suppresses renal crystal formation.

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Colony-stimulating factor-1 signaling suppresses renal crystal formation.

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