Lactobacillus acidophilus NCK2187 and its SlpA do not protect against DSS‐induced colitis in Signr3−/− miceWT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water.Figure 6WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.A Colitis severity was determined in part by weight loss. n = 5 mice/group. WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.B, C Colitis scores based on histopathology and gross morphology of the colons were also used as measures of disease. Scale bar = 50 μm. n = 5 mice/group. Empty bars = WT; lined bars = KO; white bars = untreated; purple bars = DSS; red bars = DSS + NCK56; green bars = DSS + NCK2187; blue bars = DSS + SlpA. WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.D Colonoscopies were performed in the different groups with a Multi‐Purpose Rigid™ Telescope attached to a TELE PACK X on day 10. WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.E Mean relative colonic expression of tight junction‐associated genes in WT mice. n = 5 mice/group. WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.F Fecalalbumin levels in WT mice as a measure of intestinal permeability. n = 5 mice/group. WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.G UniFrac analyses were used to calculate distances between the microbial communities of the different samples (day 10), and three‐dimensional scatter plots were generated by using PCoA. Light gray: WT + DSS; green: WT + DSS + NCK56; brown: WT + DSS + NCK2187; blue: WT + DSS + SlpA; aqua: KO + DSS; red: KO + DSS + NCK56; yellow: KO + DSS + NCK2187; purple: KO + DSS + SlpA. n = 4-6 mice/group. WT B6 or B6 Signr3−/− (KO) mice were orally gavaged with NCK56, NCK2187, or SlpA on days −3 and −1, and 3% DSS was given in the drinking water. Mice were gavaged with bacteria or purified SlpA every other day for an additional three times and monitored for disease progression.H Species richness and microbial diversity in DSS‐treated mice. Top: The Chao richness index was used as a measure of species richness. Bottom: The Shannon diversity index was used to estimate microbial diversity for each group. n = 4-6 mice/group. Color coding is as in (B).