1. Guo, A.; He, D.; Xu, H.B.; Geng, C.A.; Zhao, J. Promotion of regulatory T cell induction by immunomodulatory herbal medicine licorice and its two constituents. Sci. Rep. 2015, 5, 14046. [CrossRef] [PubMed]
2. Pabst, O.; Mowat, A.M. Oral tolerance to food protein. Mucosal Immun. 2012, 5, 232–239. [CrossRef] [PubMed]
3. Mucida, D.; Park, Y.; Kim, G.; Turovskaya, O.; Scott, I.; Kronenberg, M.; Cheroutre, H. Reciprocal TH17 and regulatory T cell differentiation mediated by retinoic acid. Science 2007, 317, 256–260. [CrossRef] [PubMed]
4. Iwata, M.; Hirakiyama, A.; Eshima, Y.; Kagechika, H.; Kato, C.; Song, S.Y. Retinoic acid imprints gut-homing specificity on T cells. Immunity 2004, 21, 527–538. [CrossRef] [PubMed]
5. Iwata, M. Retinoic acid production by intestinal dendritic cells and its role in T-cell trafficking. Semin. Immunol. 2009, 21, 8–13. [CrossRef] [PubMed]
6. Denning, T.L.; Wang, Y.C.; Patel, S.R.; Williams, I.R.; Pulendran, B. Lamina propria macrophages and dendritic cells differentially induce regulatory and interleukin 17-producing T cell responses. Nat. Immunol. 2007, 8, 1086–1094. [CrossRef]
7. Nekohashi, M.; Ogawa, M.; Ogihara, T.; Nakazawa, K.; Kato, H.; Misaka, T.; Abe, K.; Kobayashi, S. Luteolin and quercetin affect the cholesterol absorption mediated by epithelial cholesterol transporter Niemann–Pick c1-like 1 in caco-2 cells and rats. PLoS ONE 2014, 9, e97901. [CrossRef] [PubMed]
8. Suzuki, T.; Hara, H. Quercetin enhances intestinal barrier function through the assembly of zonula [corrected] occludens-2, occludin, and claudin-1 and the expression of claudin-4 in Caco-2 cells. J. Nutr. 2009, 139, 965–974. [CrossRef] [PubMed]
9. De la Peña, J.B.; Kim, C.A.; Lee, H.L.; Yoon, S.Y.; Kim, H.J.; Hong, E.Y.; Kim, G.H.; Ryu, J.H.; Lee, Y.S.; Kim, K.M.; et al. Luteolin mediates the antidepressant-like effects of Cirsium japonicum in mice, possibly through modulation of the GABAA receptor. Arch. Pharm. Res. 2014, 37, 263–269. [CrossRef] [PubMed]
10. Yang, Y.; Zhang, X.; Xu, M.; Wu, X.; Zhao, F.; Zhao, C. Quercetin attenuates collagen-induced arthritis by restoration of Th17/Treg balance and activation of Heme Oxygenase 1-mediated anti-inflammatory effect. Int. Immunopharmacol. 2018, 54, 153–162. [CrossRef] [PubMed]
11. Nishitani, Y.; Yamamoto, K.; Yoshida, M.; Azuma, T.; Kanazawa, K.; Hashimoto, T.; Mizuno, M. Intestinal anti-inflammatory activity of luteolin: Role of the aglycone in NF-κB inactivation in macrophages co-cultured with intestinal epithelial cells. Biofactors 2013, 39, 522–533. [CrossRef] [PubMed]
12. Mora, J.R.; Iwata, M.; Eksteen, B.; Song, S.Y.; Junt, T.; Senman, B.; Otipoby, K.L.; Yokota, A.; Takeuchi, H.; Ricciardi- Castagnoli, P.; et al. Generation of gut-homing IgA-secreting B cells by intestinal dendritic cells. Science 2006, 314, 1157–1160. [CrossRef] [PubMed]
13. Orihara, K.; Narita, M.; Tobe, T.; Akasawa, A.; Ohya, Y.; Matsumoto, K.; Saito, H. Circulating Foxp3+CD4+ cell numbers in atopic patients and healthy control subjects. J. Allergy Clin. Immunol. 2007, 120, 960–962. [CrossRef] [PubMed]