To visualize the inflammatory response of hPdLFs, the activation of THP1 monocytic cells was analyzed as previously described [40 (link)]. CMFDA (Thermo Fisher Scientific, Carlsbad, CA, USA)-stained THP1 cells were added to each well of stimulated hPdLFs. After the removal of non-adherent cells, the remaining adherent cells were fixed for 10 min in 4% paraformaldehyde (PFA). DAPI (1:10,000 in PBS) staining was used to visualize cell nuclei. Membrane cut-outs were embedded with Mowiol® 4-88 (Carl Roth, Karlsruhe, Germany) on glass object slides.
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