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Intracellular Signaling Pathways Modulated by Phenolic Compounds: Application for New Anti-Inflammatory Drugs Discovery

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Extensive research within the last two decades revealed that most chronic illnesses, including cancer, neurological, autoimmune and cardiovascular diseases are mediated through chronic inflammation. Thus, suppressing chronic inflammation has the potential to delay, prevent, and treat those diseases. However, side effects and high costs of current anti-inflammatory drugs force the development of new drugs.

Natural products represent an important source of new bioactive compounds. Among them, phenolic compounds, which are widely distributed in plants, have been described as having many therapeutic effects. Several reviews have addressed the anti-inflammatory activity of phenols, attributing their properties not only to the antioxidant capacity, but also to inflammatory mediators’ modulation, namely cytokines and pro-inflammatory proteins, such as inducible nitric oxide synthase and cyclooxygenase-2.

Signal transduction pathways precede changes in inflammatory mediators’ expression. However, only a restricted number of studies have addressed the effect of phenols on a specific signal transduction pathway. The present review attempts to summarize and highlight a broad range of inflammation-associated signaling pathways modulated by phenols namely: nuclear factor (NF)-κB, activator protein (AP)-1, peroxisome proliferator-activated receptor (PPAR) and nuclear factor erythroid 2-related factor 2 (Nrf2) transcription factors; mitogen-activated protein kinases (MAPKs); protein tyrosine kinases (PTKs); tyrosine phosphatidylinositol 3-kinase (PI3K)/Akt and ubiquitin-proteasome system. As a consequence of phenols effect on signaling pathways, described above, their action on inflammatory mediators’ production is mentioned. Finally, it is established that the structure-activity relationships of phenolic compounds are a valuable information source on the development of new anti-inflammatory drugs from natural products.
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Keywords: Cytokines; chemokines; drug discovery; flavonoids; inflammation; intracellular signaling pathways; mitogen-activated protein kinase; natural compounds; nitric oxide; phenolic compounds; proteasome; structure-activity relationship; transcription factor

Document Type: Research Article

Affiliations: Centro de Estudos Farmaceuticos, Faculdade de Farmacia, Universidade de Coimbra, Polo das Ciencias da Saude, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal.

Publication date: 2012-06-01

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  • Current Medicinal Chemistry covers all the latest and outstanding developments in medicinal chemistry and rational drug design. Each issue contains a series of timely in-depth reviews written by leaders in the field covering a range of the current topics in medicinal chemistry. Current Medicinal Chemistry is an essential journal for every medicinal chemist who wishes to be kept informed and up-to-date with the latest and most important developments.
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