CSF1R inhibition by small molecule affects T-helper cell differentiation independently of microglia depletion
Lei, F.; Cui, N.; Zhou, C.; Chodosh, J.; Vavvas, D. D.; Paschalis, E. I.
Show abstract
Colony-stimulating factor 1 receptor (CSF1R) inhibition has been proposed as a specific method for microglia depletion. However, recent work revealed that in addition to microglia, CSF1R inhibition also affects other innate immune cells, such as peripheral monocytes and tissueresident macrophages of the lung, liver, spleen, and peritoneum. Here, we show that this effect is not restricted to innate immune cells only, but extends to the adaptive immune compartment. CSF1R inhibition alters the transcriptional profile of bone marrow cells that control T helper cell activation. In vivo or ex vivo inhibition of CSF1R profoundly changes the transcriptional profile of CD4+ cells and suppresses Th1 and Th2 differentiation in directionally stimulated and unstimulated cells and independently of microglia depletion. Given that T cells also contribute in CNS pathology, these effects may have practical implications in the interpretation of relevant experimental data. Significance statementHere we show that CSF1R inhibition affects not only innate immune cells and microglia, but also the adaptive immune compartment by suppressing Th1/Th2 differentiation of CD4+ cells, independently of microglia depletion.
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