The Related Mechanisms Predicted through Network-Based Pharmacological Analysis and the Anti-Inflammatory Effects of Fraxinus rhynchophylla Hance Bark on Contact Dermatitis in Mice.

Fraxinus rhynchophylla Hance bark has been used to treat patients with inflammatory or purulent skin diseases in China, Japan, and Korea. This study was undertaken to determine the mechanism responsible for the effects of F. rhynchophylla and whether it has a therapeutic effect in mice with contact dermatitis (CD). In this study, the active compounds in F. rhynchophylla, their targets, and target gene information for inflammatory dermatosis were investigated using network-based pharmacological analysis. Docking analysis was conducted using AutoDock Vina. In addition, the therapeutic effect of an ethanolic extract of F. rhynchophylla (EEFR) on skin lesions and its inhibitory effects on histopathological abnormalities, inflammatory cytokines, and chemokines were evaluated. Finally, its inhibitory effects on the nuclear factor-kappa B (NF-κB) and mitogen-activated protein kinase (MAPK) signalling pathways were observed in RAW 264.7 cells. In our results, seven active compounds were identified in F. rhynchophylla, and six were associated with seven genes associated with inflammatory dermatosis and exhibited a strong binding affinity (<-6 kcal/mol) to prostaglandin G/H synthase 2 (PTGS2). In a murine 1-fluoro-2,4-dinitrobenzene (DNFB) model, topical EEFR ameliorated the surface symptoms of CD and histopathological abnormalities. EEFR also reduced the levels of tumour necrosis factor (TNF)-α, interferon (IFN)-γ, interleukin (IL)-6, and monocyte chemotactic protein (MCP)-1 in inflamed tissues and inhibited PTGS2, the nuclear translocation of NF-κB (p65), and the activation of c-Jun N-terminal kinases (JNK) in RAW 264.7 cells. In conclusion, the bark of F. rhynchophylla has potential use as a therapeutic or cosmetic agent, and the mechanism responsible for its effects involves the suppression of inflammatory mediators, nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor (IκB)-α degradation, the nuclear translocation of NF-κB, and JNK phosphorylation.

Subchronic toxicity evaluation of ethanol extract of Cassia tora L. seeds in rats.

Cassia tora Linn. is an annual or perennial plant of the Fabaceae/Leguminosae family. It is used in traditional medicine for various biological activities including anti-constipation, anti-inflammatory, visual acuity, and hepato-protective activities. The present study was carried out to investigate the potential toxicity of C. tora L. seed ethanol extract (CTSEE) following a 13-week repeated oral administration to Sprague-Dawley rats. CTSEE was administered orally to male and female rats for 13 weeks at 0 (control), 500, 1000, and 2000 mg/kg/day (n = 10, for male and female rats for each dose). Additional recovery groups from the control group and high dose group were observed for a 4-week recovery period. At the end of the treatment and recovery periods, animals were sacrificed, and their organs were weighed and blood samples collected. There were no treatment-related adverse effects in clinical signs, body weight, food consumption, estrous cycle, sperm parameters, urinalysis, hematology, serum biochemistry, necropsy findings, organ weight, and histopathology at any doses tested. Under the present experimental conditions, the no-observed-adverse-effect level of the CTSEE was >2000 mg/kg/day in both genders, and no target organs were identified.

Anti-Inflammatory Effects of Artemisia Leaf Extract in Mice with Contact Dermatitis In Vitro and In Vivo.

The leaves of Artemisia argyi Lev. et Vant. and A. princeps Pamp. are well known medicinal herbs used to treat patients in China, Japan, and Korea with skin problems such as eczema and itching, as well as abdominal pain and dysmenorrhoea. We investigated the anti-inflammatory effects of Artemisia leaf extract (ALE) using CD mice and Raw 264.7 cells. The effects of ALE on histopathological changes and cytokine production in ear tissues were assessed in mice with CD induced by 1-fluoro-2,4-dinitrobenzene (DNFB). Moreover, the anti-inflammatory effects on production levels of prostaglandin E2 (PGE2) and nitric oxide (NO) and expression levels of cyclooxygenase 2 (COX-2) and inducible nitric oxide synthase (iNOS) were investigated in Raw 264.7 cells. Topical application of ALE effectively prevented ear swelling induced by repeated DNFB application. ALE prevented epidermal hyperplasia and infiltration of immune cells and lowered the production of interferon- (IFN-) gamma (γ), tumour necrosis factor- (TNF-) alpha (α), and interleukin- (IL-) 6 in inflamed tissues. In addition, ALE inhibited expression of COX-2 and iNOS and production of NO and PGE2 in Raw 264.7 cells. These results indicate that Artemisia leaf can be used as a therapeutic agent for inflammatory skin diseases and that its anti-inflammatory effects are closely related to the inhibition of inflammatory mediator release from macrophages and inflammatory cytokine production in inflamed tissues.

Anti-inflammatory Effects of Ampelopsis Japonica Root on Contact Dermatitis in Mice.

OBJECTIVE: To investigate the anti-inflammatory potential of Ampelopsis japonica on contact dermatitis (CD). METHODS: A total of 38 Balb/c mice were divided into 5 groups by using a random number table: normal mice (n=6), CD model mice (n=8), CD mice treated with 3 or 30 mg/kg of the ethanol extract of A. japonica (EEAJ, n=8) and 7.5 mg/kg dexamethasone treated CD mice (DEX, n=8). CD was induced using topical application of 1-fluoro-2,4-dinitrofluorobenzene in mice. EEAJ and DEX were topically applied to the shaved skin of each mouse for 6 days, and the effects of EEAJ and DEX on skin lesions and color, histopathological abnormalities such as epidermal hyperplasia and immune cell infiltration, and tumor necrosis factor (TNF)-α, interleukin-6 (IL-6), and monocyte chemoattractant protein-1 (MCP-1) production were investigated. The effects on changes in body weights and spleen/body weight ratio were also investigated. RESULTS: EEAJ at 30 mg/kg significantly prevented scaling, erythema and enlargement of skin weight compared to using carbon dioxide. EEAJ also prevented epithelial hyperplasia and immune cell infiltrations induced by repeated application of DNFB (P<0.01). In addition, EEAJ significantly lowered levels of TNF-α, IL-6 and MCP-1 (P<0.05 or P<0.01). The anti-inflammatory effects of EEAJ were similar to those of DEX. CONCLUSION: A. japonica may be a new therapeutic agent with the potential to reduce or replace corticosteroids and its mechanisms are closely related to regulation of TNF-α production.

Prediction of the therapeutic mechanism responsible for the effects of Sophora japonica flower buds on contact dermatitis by network-based pharmacological analysis.

ETHNOPHARMACOLOGICAL RELEVANCE: The flower buds of Sophora japonica L. are a major traditional medicine in China, Japan, and Korea and are used to stop bleeding and 'cool the blood'. Accordingly, they are used to treat bleeding haemorrhoids, hypertension, and pyoderma. In addition, it was recently found that the flower buds of S. japonica (SJ) have cosmetic whitening properties. MATERIALS AND METHODS: Compounds in SJ and their targets and related diseases were investigated using the Traditional Chinese Medicine Systems Pharmacology (TCMSP) database and analysis platform. Target gene information was obtained from the UniProt database. Network construction was carried out using Cytoscape 3.72. Contact dermatitis (CD)-related gene searching was performed using the Cytoscape string App. Docking analysis was conducted using AutoDock Vina. Six-week-old Balb/c male mice with DNFB (1-fluoro-2,4-dinitrofluorobenzene)-induced CD were treated with a methanol extract of the flower buds of S. japonica (MESJ), and its effects on skin colour, lesions, and immune cell infiltration, and on histopathological abnormalities such as epidermal hyperplasia were investigated. RESULTS: Eleven compounds targeted 13 CD-related genes, that is, serum albumin (ALB), prostaglandin G/H synthase (COX) 2, C-X-C motif chemokine (CXCL) 2, CXCL10, ICAM1, IFN-γ, IL-10, IL-1α, IL-1ß, IL-2, IL-6, E-selectin, and TNF. In the murine DNFB model, MESJ significantly suppressed scaling, erythema, and skin thickening as compared with DNFB controls and epithelial hyperplasia and immune cell infiltrations induced by repeated DNFB application. CONCLUSIONS: Our animal study showed that the mode of action of MESJ was closely related to the prevention of epithelial hyperplasia and immune cell infiltration. The results obtained demonstrated that the flower buds of S. japonica offer a potential means of treating CD, and suggest that the therapeutic mechanism of CD is explained by relations between 11 major components of SJ, including kaempferol and quercetin, and 13 CD-related genes.

A 13-week repeated oral dose toxicity evaluation and a 4-week recovery evaluation of the Sam So Eum (SSE) in male and female rats.

ETHNOPHAMACOLOGICAL RELEVANCE: Sam So Eum (SSE), used in traditional Korean medicine, has been prescribed for the treatment of various ailments including emesis, and fever for centuries. SSE is known by several different names (Shen Su Yin in traditional Chinese medicine; Jin So In traditional Japanese Kampo medicine). It is a mixture of medicinal plants including Panax ginseng C. A. Mey., Perilla frutescens (L.) Britton, and Peucedanum praeruptorum Dunn. Studies have revealed that SSE has many pharmacological effects including anti-inflammatory, anti-cancer, and anti-allergic properties, but its toxic effects have not been evaluated in vivo. Recently, the use of traditional medicinal herbs to treat various diseases has increased, owing to increased number of studies supporting their efficacy. However, safety evaluations for toxicity and other adverse effects have not been extensive. It is commonly considered that natural products extracted from traditional medicinal herbs are safer than synthetic drugs, but this lacks a scientific basis. Thus, in this study, we evaluated the toxicity of SSE in male and female rats. AIM OF THE STUDY: To evaluated the safety of SSE in male and female rats. MATERIALS AND METHODS: SSE was administered orally for 13 weeks at 1000, 2000, and 4000 mg kg-1·day-1, and then the rats were maintained for 4 weeks without SSE administration (recovery evaluation). RESULTS: We observed the animals for changes in clinical signs, including hematological parameters, and food consumption; serum chemistry profiling and urinalysis were also carried out. Creatinine levels in the serum were significantly increased following oral administration of SSE at 2000 and 4000 mg kg-1·day-1 in male and female rats, but returned to the normal levels during the recovery period. In addition, SSE administration does not cause kidney and liver toxicity. Thus, we determined that the no-observed-adverse-effect level of SSE is 4000 mg kg-1·day-1. The no-observed-effect level of SSE was determined to be 1000 mg kg-1·day-1, because serum creatinine was increased by oral administration of SSE at 2000 and 4000 mg kg-1·day-1 in male and female rats. CONCLUSIONS: SSE administration does not cause toxicity at 4000 mg kg-1·day-1 in male and female rats.

Gentiana scabra Bunge roots alleviates skin lesions of contact dermatitis in mice.

ETHNOPHARMACOLOGICAL RELEVANCE: The roots and rhizomes of Gentiana scabra Bunge in the family Gentianaceae comprise a major herbal medicine for skin diseases caused by wind-heat or dampness-heat in China, Japan and Korea. This treatment can clear away heat and dry dampness and purge fire from the liver and gallbladder. AIM OF THE STUDY: This study was designed to investigate the therapeutic potential and anti-inflammatory effects of G. scabra, roots and rhizomes. MATERIALS AND METHODS: Thin layer chromatography (TLC) and high performance liquid chromatography (HPLC) revealed the presence of gentiopicrin in the roots and rhizomes of G. scabra. We then investigated the effects of ethanol extract of G. scabra, roots and rhizomes (EEGS) on skin lesions and thickness, erythema and melanin index, histopathological abnormalities, and cytokine and chemokine production in mice with contact dermatitis (CD) induced by 1-fluoro-2,4-dinitrofluorobenzene (DNFB). Moreover, the effects of EEGS on body weights and spleen body weight ratio were evaluated. RESULTS: Topical application of EEGS alleviated skin lesions such as surface roughness, excoriations and scabs on the skin of CD mice, as well as prevented skin enlargement, and lowered the erythema and melanin index. In addition, EEGS prevented hyperkeratosis, epidermal hyperplasia and immune cell infiltration, and inhibited TNF-α, IFN-γ, IL-6 and MCP-1 production in inflamed tissues. EEGS did not affect changes in body weights and spleen body weight ratio in contrast to dexamethasone. CONCLUSIONS: These data indicate that the roots and rhizomes of G. scabra can be used as anti-inflammatory agents for CD with relative safety and that its therapeutic mechanisms are related to regulation of pro-inflammatory cytokines such as TNF-α and IFN-γ.

Anti-inflammatory Effects of Brassica oleracea Var. capitata L. (Cabbage) Methanol Extract in Mice with Contact Dermatitis.

BACKGROUND: Cabbage, Brassica oleracea var. capitata L., is one of the most common vegetables in the world. Because of its high levels of flavonoids and anthocyanins, cabbage has long been used as a herbal medicine. The antioxidant and anti-inflammatory properties of cabbage were also recently been reported. OBJECTIVE: This study was designed to investigate the anti-inflammatory effects of cabbage in mice with contact dermatitis (CD). MATERIALS AND METHODS: We investigated the effects of methanol extract of B. oleracea var. capitata L. (MEBO) on ear swelling, erythema, and histopathological changes in CD mice. Moreover, the effects on cytokine production and the spleen/body weight ratio were investigated. RESULTS: Topical treatment with MEBO inhibited ear swelling and erythema significantly. MEBO also significantly inhibited epidermal hyperplasia and infiltration of immune cells. Furthermore, the levels of tumor necrosis factor-alpha, interferon-gamma, interleukin-6, and monocyte chemotactic protein-1 in inflamed tissues were effectively lowered by MEBO. Finally, MEBO did not affect body weight gain or spleen body weight ratio. CONCLUSIONS: These results indicate that cabbage can be used for the treatment of skin inflammation and that its anti-inflammatory activity is closely related to the inhibition of Th1 skewing reactions. SUMMARY: MEBO inhibited ear thickness, weight, and erythema in inflamed skinMEBO also prevented epidermal hyperplasia and infiltration of immune cellsThe levels of tumor necrosis factor-α, interferon-γ, interleukin-6, and monocyte chemotactic protein-1 in inflamed tissues were lowered by MEBO. Abbreviations used: AOO: Acetone and olive oil (4:1), CBA: Cytometric bead array, CD: Contact dermatitis, DEX: Dexamethasone, DNFB: 1-fluoro-2,4-dinitrofluorobenzene, GM-CSF: Granulocyte-macrophage colony-stimulating factor, ICAM-1: Intercellular Adhesion Molecule-1, LPS: Lipopolysaccharide, MEBO: Methanol extract of Brassica oleracea, MCP-1: Monocyte chemotactic protein-1, NO: Nitric oxide.

Decoction of Dictamnus Dasycarpus Turcz. Root Bark Ameliorates Skin Lesions and Inhibits Inflammatory Reactions in Mice with Contact Dermatitis.

BACKGROUND: The root bark of Dictamnus dasycarpus Turcz. (Dictamni Radicis Cortex) has been widely used to treat skin diseases in Korea, and its anti-inflammatory efficacies were recently reported. OBJECTIVE: The paper aims to investigate the inhibitory effects of decoction of Dictamni Radicis Cortex (DDRC) in mice with contact dermatitis (CD). MATERIALS AND METHODS: We investigated the effects of DDRC on skin lesion characteristics such as crust, scales, incrustation and petechiae, the erythema and melanin indexes, skin thickness, histopathologic changes, and cytokine production in 1-fluoro-2,4-dinitrofluorobenzene (DNFB)-induced CD mice. RESULTS: Topical application of DDRC ameliorated crust, scales, incrustation, and induced by DNFB. In addition, DDRC lowered the erythema index significantly (P < 0.05). DDRC effectively inhibited enlargement of skin thickness (P < 0.05). Histopathologic observation showed that DDRC inhibited epidermal hyperplasia, hyperkeratosis, and spongiotic changes. Finally, DDRC decreased production levels of IFN-γ, TNF-α and IL-6 induced by repeated application of DNFB (P < 0.05). CONCLUSION: These data suggest that DDRC can be used in the treatment of inflammatory skin diseases including CD. Moreover, these results are closely related to the decreasing production of TNF-α IFN-γ and IL-6 in inflamed tissues. SUMMARY: DDRC ameliorated skin lesions such as crust, scales, incrustation and petechiae, and lowered erythema index on skin surface in CD miceDDRC inhibited enlargement of dorsal skin and prevented epidermal hyperplasia, hyperkeratosis, and spongiotic changes in inflamed tissuesDDRC reduced the levels of TNF-α, IFN-γ, and IL-6 in inflamed tissues of CD miceDDRC did not affect spleen/body weight ratio in CD mice. Abbreviations used: DDRC: decoction of Dictamni Radicis Cortex, CD: contact dermatitis, DNFB: 1-fluoro-2,4-dinitrofluorobenzene, AOO: acetone and olive oil, DEX: dexamethasone, CBA: cytometric bead array.