Expression and significance of toll like receptor 4 mRNA and nuclear factor-kappaB p50 mRNA in human normal nasal mucosa after stimulation by lipopolysaccharide / 中华耳鼻咽喉头颈外科杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the expression and significance of Toll like receptor (TLR)4 mRNA and nuclear factor (NF)-kappaB p50 mRNA in human normal nasal mucosal cell before and after stimulation by LPS.</p><p><b>METHODS</b>The tissue was obtained from 15 normal middle turbinates (without rhinosinusitis). Every tissue was cultured in vitro, divided into 2 specimens. LPS was added into 15 specimens as LPS group and not added into other 15 specimens as control group. The pathomorphological characters of nasal mucosal cells were observed under optical microscope after stimulation by LPS. The expression of TLR4 mRNA and NF-kappaB p50 mRNA in normal human nasal mucosal cells were evaluated by in situ hybridization.</p><p><b>RESULTS</b>Normal mucociliary agglutinated and mucosal cells were enlarged after stimulation by LPS; The expression of TLR4 mRNA in LPS group was higher than control group obviously. Their average density of light was 1.283 +/- 0.027 in LPS group while 0.538 +/- 0.038 in control group, and there was statistical significance between the two groups (t = 1.761, P < 0.05). The expression of NF-kappaB p50 mRNA was higher than control group obviously, and expressed in cellular nucleus predominantly. Their average density of light was 1. 668 +/- 0.037 in LPS group while 0. 372 +/- 0.052 in control group, and there was statistical significance between the two groups (t = 2. 624, P < 0. 01).</p><p><b>CONCLUSIONS</b>LPS can activate the NF-kappaB p50 of human nasal mucosal cells through TLR4, and it may play some roles in stimulating and damage effect induced by LPS in nasal mucosal cells.</p>