Reduced macrophage recruitment, proliferation, and activation in colony-stimulating factor-1-deficient mice results in decreased tubular apoptosis during renal inflammation - PubMed (original) (raw)
Comparative Study
. 2003 Mar 15;170(6):3254-62.
doi: 10.4049/jimmunol.170.6.3254.
Affiliations
- PMID: 12626584
- DOI: 10.4049/jimmunol.170.6.3254
Comparative Study
Reduced macrophage recruitment, proliferation, and activation in colony-stimulating factor-1-deficient mice results in decreased tubular apoptosis during renal inflammation
Deborah M Lenda et al. J Immunol. 2003.
Abstract
Kidney tubular epithelial cell (TEC) death may be dependent on the number and activation state of macrophages (M phi) during inflammation. Our prior studies indicate that activated M phi release soluble mediators that incite TEC death, and reducing intrarenal M phi during kidney disease diminishes TEC apoptosis. CSF-1 is required for M phi proliferation and survival. We hypothesized that in the absence of CSF-1, M phi-mediated TEC apoptosis would be prevented during renal inflammation. To test this hypothesis, we evaluated renal inflammation during unilateral ureter obstruction in CSF-1-deficient (Csf1(op)/Csf1(op)) mice. We detected fewer M phi and T cells and less apoptotic TEC in the obstructed kidneys of Csf1(op)/Csf1(op) mice compared with wild-type (WT) mice. The decrease in intrarenal M phi resulted from diminished recruitment and proliferation, not enhanced apoptosis. CSF-1 enhanced M phi activation. There were far fewer activated (CD69, CD23, Ia, surface expression) M phi in obstructed CSF-1-deficient compared with WT obstructed kidneys. Similarly, bone marrow M phi preincubated with anti-CSF-1 receptor Ab or anti-CSF-1 neutralizing Ab were resistant to LPS- and IFN-gamma-induced activation. We detected fewer apoptotic-inducing molecules (reactive oxygen species, TNF-alpha, inducible NO synthase) in 1) M phi propagated from obstructed Csf1(op)/Csf1(op) compared with WT kidneys, and 2) WT bone marrow M phi blocked with anti-CSF-1 receptor or anti-CSF-1 Ab compared with the isotype control. Furthermore, blocking CSF-1 or the CSF-1 receptor induced less TEC apoptosis than the isotype control. We suggest that during renal inflammation, CSF-1 mediates M phi recruitment, proliferation, activation, and, in turn, TEC apoptosis.
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