Title |
Clinical efficacy and IL-17 targeting mechanism of Indigo naturalis as a topical agent in moderate psoriasis
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Published in |
BMC Complementary Medicine and Therapies, September 2017
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DOI | 10.1186/s12906-017-1947-1 |
Pubmed ID | |
Authors |
Hui-Man Cheng, Yang-Chang Wu, Qingmin Wang, Michael Song, Jackson Wu, Dion Chen, Katherine Li, Eric Wadman, Shung-Te Kao, Tsai-Chung Li, Francisco Leon, Karen Hayden, Carrie Brodmerkel, C. Chris Huang |
Abstract |
Indigo naturalis is a Traditional Chinese Medicine (TCM) ingredient long-recognized as a therapy for several inflammatory conditions, including psoriasis. However, its mechanism is unknown due to lack of knowledge about the responsible chemical entity. We took a different approach to this challenge by investigating the molecular profile of Indigo naturalis treatment and impacted pathways. A randomized, double-blind, placebo-controlled clinical study was conducted using Indigo naturalis as topical monotherapy to treat moderate plaque psoriasis in a Chinese cohort (n = 24). Patients were treated with Indigo naturalis ointment (n = 16) or matched placebo (n = 8) twice daily for 8 weeks, with 1 week of follow-up. At week 8, significant improvements in Psoriasis Area and Severity Index (PASI) scores from baseline were observed in Indigo naturalis-treated patients (56.3% had 75% improvement [PASI 75] response) compared with placebo (0.0%). A gene expression signature of moderate psoriasis was established from baseline skin biopsies, which included the up-regulation of the interleukin (IL)-17 pathway as a key component; Indigo naturalis treatment resulted in most of these signature genes returning toward normal, including down-regulation of the IL-17 pathway. Using an in vitro keratinocyte assay, an IL-17-inhibitory effect was observed for tryptanthrin, a component of Indigo naturalis. This study demonstrated the clinical efficacy of Indigo naturalis in moderate psoriasis, and exemplified a novel experimental medicine approach to understand TCM targeting mechanisms. NCT01901705 . |
X Demographics
Geographical breakdown
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United States | 2 | 100% |
Demographic breakdown
Type | Count | As % |
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Scientists | 1 | 50% |
Practitioners (doctors, other healthcare professionals) | 1 | 50% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 94 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Bachelor | 10 | 11% |
Student > Master | 9 | 10% |
Student > Doctoral Student | 9 | 10% |
Other | 7 | 7% |
Researcher | 6 | 6% |
Other | 14 | 15% |
Unknown | 39 | 41% |
Readers by discipline | Count | As % |
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Medicine and Dentistry | 16 | 17% |
Pharmacology, Toxicology and Pharmaceutical Science | 14 | 15% |
Biochemistry, Genetics and Molecular Biology | 4 | 4% |
Nursing and Health Professions | 4 | 4% |
Agricultural and Biological Sciences | 4 | 4% |
Other | 9 | 10% |
Unknown | 43 | 46% |