Eﬀects of Apigenin on RBL-2H3, RAW264.7, and
HaCaT Cells: Anti-Allergic, Anti-Inﬂammatory,
and Skin-Protective Activities
Che-Hwon Park 1,†, Seon-Young Min 1,†, Hye-Won Yu 1, Kyungmin Kim 2, Suyeong Kim 2, Hye-Ja Lee 3, Ji-Hye Kim 3 and Young-Jin Park 1,*
1 Department of Medicinal Biosciences, Research Institute for Biomedical & Health Science, College of Biomedical and Health Science, Konkuk University, 268 Chungwon-daero, Chungju-si 27478,
Korea; email@example.com (C.-H.P.); firstname.lastname@example.org (S.-Y.M.); email@example.com (H.-W.Y.)
2 Jeju R&D Center, AMI Cosmetics Co., Ltd., 16, Sancheondandong-gil, Jeju-si 63359, Korea; firstname.lastname@example.org (K.K.); email@example.com (S.K.)
3 Natural Products Laboratory, DAEBONG Life Science Co., Ltd., 213-4, Chumdan-Ro, Jeju-si 63309, Korea; firstname.lastname@example.org (H.-J.L.); email@example.com (J.-H.K.)
* Correspondence: firstname.lastname@example.org; Tel.: +82-43-840-3601
† These authors contributed equally to this work.
Received: 4 June 2020; Accepted: 28 June 2020; Published: 29 June 2020
Apigenin (4′,5,7-trihydroxyﬂavone, ﬂavonoid) is a phenolic compound that is known to reduce the risk of chronic disease owing to its low toxicity. The ﬁrst study on apigenin analyzed its eﬀect on histamine release in the 1950s. Since then, anti-mutation and antitumor properties of apigenin have been widely reported. In the present study, we evaluated the apigenin-mediated amelioration of skin disease and investigated its applicability as a functional ingredient, especially in cosmetics. The eﬀect of apigenin on RAW264.7 (murine macrophage), RBL-2H3 (rat basophilic leukemia), and HaCaT (human immortalized keratinocyte) cells were analyzed. Apigenin (100 µM) signiﬁcantly inhibited nitric oxide (NO) production, cytokine expression (interleukin (IL)-1β, IL6, cyclooxygenase (COX)-2, and inducible nitric oxide synthase [iNOS]), and phosphorylation of mitogen-activated protein kinase (MAPK) signal molecules, including extracellular signal-regulated kinase (ERK) and c-Jun N-terminal protein kinase (JNK) in RAW264.7 cells. Apigenin (30 µM) also inhibited the phosphorylation of signaling molecules (Lyn, Syk, phospholipase Cγ1, ERK, and JNK) and the expression of high-aﬃnity IgE receptor FcεRIα and cytokines (tumor necrosis factor (TNF)-α, IL-4, IL-5, IL-6, IL-13, and COX-2) that are known to induce inﬂammation and allergic responses in RBL-2H3 cells. Further, apigenin (20 µM) signiﬁcantly induced the expression of ﬁlaggrin, loricrin, aquaporin-3, hyaluronic acid, hyaluronic acid synthase (HAS)-1, HAS-2, and HAS-3 in HaCaT cells that are the main components of the physical barrier of the skin. Moreover, it promoted the expression of human β-defensin (HBD)-1, HBD-2, HBD-3, and cathelicidin (LL-37) in HaCaT cells. These antimicrobial peptides are known to play an important role in the skin as chemical barriers. Apigenin signiﬁcantly suppressed the inﬂammatory and allergic responses of RAW264.7 and RBL cells, respectively, and would, therefore, serve as a potential prophylactic and therapeutic agent for immune-related diseases. Apigenin could also be used to improve the functions of the physical and chemical skin barriers and to alleviate psoriasis, acne, and atopic dermatitis.
anti-inﬂammation; anti-allergy; apigenin; ﬂavone; RBL-2H3; RAW264.7; HaCaT