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Departments of 4 Medicine and 3 Biostatistics and 2 Department of Veterans Affairs Medical Center, University of Iowa, Iowa City, Iowa 52242; and 1 Department of Medicine and 5 Department of Veterans Affairs Medical Center, Duke University Medical Center, Durham, North Carolina 27710
For several decades, the mouse strains C3H/HeJ and C57BL/10ScNCr have been known to be hyporesponsive to endotoxin or lipopolysaccharide (LPS). Recently, mutations in Toll-like receptor (TLR) 4 have been shown to underlie this aberrant response to LPS. To further determine the relationship between TLR4 and responsiveness to LPS, we genotyped 18 strains of mice for TLR4 and evaluated the physiological and biological responses of these strains to inhaled LPS. Of the 18 strains tested, 6 were wild type for TLR4 and 12 had mutations in TLR4. Of those strains with TLR4 mutations, nine had mutations in highly conserved residues. Among the strains wild type for TLR4, the inflammatory response in the airway induced by inhalation of LPS showed a phenotype ranging from very sensitive (DBA/2) to hyporesponsive (C57BL/6). A broad spectrum of airway hyperreactivity after inhalation of LPS was also observed among strains wild type for TLR4. Although the TLR4 mutant strains C3H/HeJ and C57BL/10ScNCr were phenotypically distinct from the other strains with mutations in the TLR4 gene, the other strains with mutations for TLR4 demonstrated a broad distribution in their physiological and biological responses to inhaled LPS. The results of our study indicate that although certain TLR4 mutations can be linked to a change in the LPS response phenotype, additional genes are clearly involved in determining the physiological and biological responses to inhaled LPS in mammals.
Toll-like receptor 4; Toll genes; lipopolysaccharide; asthma
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