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Infection and Immunity, December 2002, p. 6638-6645, Vol. 70, No. 12
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.12.6638-6645.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Differences in Expression of Toll-Like Receptors and Their Reactivities in Dendritic Cells in BALB/c and C57BL/6 Mice

Tie Liu,1 Tetsuya Matsuguchi,1 Naotake Tsuboi,1 Toshiki Yajima,2 and Yasunobu Yoshikai2*

Laboratory of Host Defense, Research Institute for Disease Mechanism and Control, Nagoya University Graduate School of Medicine, Nagoya 466-8550,1 Division of Host Defense, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan2

Received 7 May 2002/ Returned for modification 25 July 2002/ Accepted 2 September 2002

We have previously reported that differences in early production of interleukin 12 (IL-12) by dendritic cells (DC) underlies the difference between the susceptibilities to Listeria monocytogenes of C57BL/6 and BALB/c mice. To elucidate mechanisms for the different abilities of DC to produce cytokine in C57BL/6 and BALB/c mice, we examined Toll-like receptor (TLR) expression by DC and their responses in vitro to known microbial ligands for TLRs. We found that DC isolated from the spleens of naive C57BL/6 mice preferentially expressed TLR9 mRNA, whereas DC from naive BALB/c mice strongly expressed TLR2, -4, -5, and -6 mRNAs. C57BL/6 DC produced a higher level of IL-12p40 in response to the ligands for TLR4 (lipopolysaccharide), TLR2 (lipoprotein), and TLR9 (CpG), whereas BALB/c DC responded to these ligands by producing a larger amount of monocyte chemoattractant protein 1. C57BL/6 DC expressed higher levels of CD40 and Stat4 than BALB/c DC did, suggesting that naive C57BL/6 mice contained more-mature subsets of DC than naive BALB/c mice. Differences in reactivities of DC to microbial molecules through TLRs may be associated with susceptibility and resistance to Listeria infection in BALB/c and C57BL/6 mice.


* Corresponding author. Mailing address: Division of Host Defense, Research Center for Prevention of Infectious Diseases, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan. Phone: 81-92-642-6972. Fax: 81-92-642-6973. E-mail: yoshikai{at}bioreg.kyushu-u.ac.jp.

Editor: S. H. E. Kaufmann


Infection and Immunity, December 2002, p. 6638-6645, Vol. 70, No. 12
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.12.6638-6645.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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