The BrdU Proliferation Assay
Lactobacilli were added (multiplicity of infection 50) to nonconfluent
ME-180 cells. ME-180 cells with no bacteria added were
used as a control and were normalized to 100% bromodeoxyuridine
(BrdU) uptake. To determine if pH changes could influence
cell proliferation, DMEM in which the pH had been reduced with
lactic acid (Sigma-Aldrich) was added to the cells. In addition, the
supernatants of lactobacilli after 24 hours of incubation with ME-
180 cells was sterile filtered, measured for their pH changes, and
added to new cells. The supernatant from cells that were
incubated without the addition of bacteria was used as a control
for this assay. The cells that had experienced the addition of
bacteria, supernatant, or pH-reduced DMEM were all incubated
for 24 hours. Two hours prior to the termination of the assay,
BrdU was added, allowing the dye to be incorporated into the
replicating DNA of the cells that were in S phase. To quantify the
The BrdU Proliferation Assay
Lactobacilli were added (multiplicity of infection 50) to nonconfluent
ME-180 cells. ME-180 cells with no bacteria added were
used as a control and were normalized to 100% bromodeoxyuridine
(BrdU) uptake. To determine if pH changes could influence
cell proliferation, DMEM in which the pH had been reduced with
lactic acid (Sigma-Aldrich) was added to the cells. In addition, the
supernatants of lactobacilli after 24 hours of incubation with ME-
180 cells was sterile filtered, measured for their pH changes, and
added to new cells. The supernatant from cells that were
incubated without the addition of bacteria was used as a control
for this assay. The cells that had experienced the addition of
bacteria, supernatant, or pH-reduced DMEM were all incubated
for 24 hours. Two hours prior to the termination of the assay,
BrdU was added, allowing the dye to be incorporated into the
replicating DNA of the cells that were in S phase. To quantify the
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