Calcitonin gene-related peptide regulates type IV hypersensitivity through dendritic cell functions.
Dendritic cells (DCs) play essential roles in both innate and adaptive immune responses. In addition, mutual regulation of the nervous system and immune system is well studied. One of neuropeptides, calcitonin gene-related peptide (CGRP), is a potent regulator in immune responses; in particular, it has anti-inflammatory effects in innate immunity. For instance, a deficiency of the CGRP receptor component RAMP 1 (receptor activity-modifying protein 1) results in higher cytokine production in response to LPS (lipopolysaccharide). On the other hand, how CGRP affects DCs in adaptive immunity is largely unknown. In this study, we show that CGRP suppressed Th1 cell differentiation via inhibition of IL-12 production in DCs using an in vitro co-culture system and an in vivo ovalbumin-induced delayed-type hypersensitivity (DTH) model. CGRP also down-regulated the expressions of chemokine receptor CCR2 and its ligands CCL2 and CCL12 in DCs. Intriguingly, the frequency of migrating CCR2(+) DCs in draining lymph nodes of RAMP1-deficient mice was higher after DTH immunization. Moreover, these CCR2(+) DCs highly expressed IL-12 and CD80, resulting in more effective induction of Th1 differentiation compared with CCR2(-) DCs. These results indicate that CGRP regulates Th1 type reactions by regulating expression of cytokines, chemokines, and chemokine receptors in DCs.
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Norihisa
N
Mikami
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Kaori
K
Sueda
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Yusuke
Y
Ogitani
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Ippei
I
Otani
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Miku
M
Takatsuji
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Yasuko
Y
Wada
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Keiko
K
Watanabe
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Rintaro
R
Yoshikawa
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Satoshi
S
Nishioka
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Nagisa
N
Hashimoto
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Yayoi
Y
Miyagi
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
So-ichiro
S
Fukada
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Hiroshi
H
Yamamoto
Laboratory of Molecular and Cellular Physiology, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan.
Kazutake
K
Tsujikawa
D000818:Animals; D018122:B7-1 Antigen / Q000276:immunology; D015740:Calcitonin Gene-Related Peptide / Q000276:immunology*; D002454:Cell Differentiation / Q000276:immunology; D018932:Chemokine CCL2 / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology*; D015536:Down-Regulation / Q000276:immunology; D006968:Hypersensitivity, Delayed / Q000276:immunology*; D018664:Interleukin-12 / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D018945:Monocyte Chemoattractant Proteins / Q000276:immunology; D058262:Receptor Activity-Modifying Protein 1 / Q000276:immunology; D054390:Receptors, CCR2 / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology
D018122:B7-1 Antigen; C491224:Ccl12 protein, mouse; C491768:Ccl2 protein, mouse; C515335:Ccr2 protein, mouse; D018932:Chemokine CCL2; D018945:Monocyte Chemoattractant Proteins; C545505:Ramp1 protein, mouse; D058262:Receptor Activity-Modifying Protein 1; D054390:Receptors, CCR2; D018664:Interleukin-12; D015740:Calcitonin Gene-Related Peptide