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Skullcap (Scutellaria Baicalensis) Hexane Fraction Inhibits the Permeation of Ovalbumin and Regulates Th1/2 Immune Responses

1
Food Biotechnology Program, Korea University of Science and Technology, Daejeon 34113, Korea
2
Division of Nutrition and Metabolism Research, Korea Food Research Institute, 1201-62, Anyangpangyo-ro, Bundang-gu, Seongnam-si, Kyeonggi-do 463-746, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this paper.
Nutrients 2017, 9(11), 1184; https://doi.org/10.3390/nu9111184
Received: 29 August 2017 / Revised: 11 October 2017 / Accepted: 23 October 2017 / Published: 28 October 2017
Skullcap (Scutellaria baicalensis) is well known for its anti-inflammatory and anti-allergic effects. In our previous study, we found that skullcap could inhibit allergen permeation and regulate Th1/2 immune balance. To reveal the key fractions and components of skullcap, we fractionated skullcap extract into five fractions: hexane, chloroform, ethyl acetate, butanol, and water fraction. Among these fractions, the hexane fraction significantly suppressed the production of Th2-mediated cytokines (Interleukin (IL)-4, 5, 10 and 13) and increased Th1-mediated cytokines (Interferon (IFN)-γ and IL-12). Furthermore, the hexane fraction inhibited the permeation of ovalbumin (OVA), used as an allergen, across the intestinal epithelial cell monolayer. To confirm the active compounds in the hexane fraction, fatty acids were analyzed. Linoleic acid (LA, C18:2 (>59.7%)) was identified as the most important fatty acid in the skullcap hexane fraction. LA significantly suppressed IL-4 production and increased IFN-γ secretion, as well as inhibiting OVA permeation. Thus, LA significantly diminished the permeation of allergen by enhancing intestinal barrier function and regulated allergic responses to maintain Th1/Th2 immune balance. View Full-Text
Keywords: skullcap; Scutellaria baicalensis; linoleic acid; Th1/Th2 balance; Th1/2 immune response; ovalbumin permeation skullcap; Scutellaria baicalensis; linoleic acid; Th1/Th2 balance; Th1/2 immune response; ovalbumin permeation
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MDPI and ACS Style

Jung, S.Y.; Lee, S.-Y.; Choi, D.W.; See, H.-J.; Kwon, D.-A.; Do, J.-R.; Shon, D.-H.; Shin, H.S. Skullcap (Scutellaria Baicalensis) Hexane Fraction Inhibits the Permeation of Ovalbumin and Regulates Th1/2 Immune Responses. Nutrients 2017, 9, 1184.

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