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Front. Pharmacol. | doi: 10.3389/fphar.2019.00955

Editorial: Ethnopharmacological Studies for the Development of Drugs with special reference to Asteraceae

  • 1North Orissa University, India
  • 2Department of Biology, KU Leuven, Belgium
  • 3Programa de Pós-Graduação da Rede BIONORTE, Universidade Estadual do Maranhão, Brazil
  • 4International Centre for Genetic Engineering and Biotechnology (India), India
  • 5Department of Biomedical Sciences, Faculty of Medicine and Surgery, University of Cagliari, Italy

The Asteraceae (Compositae), also known as the daisy family, sunflower family or thistle family is one of the largest plant families with 32,913 accepted species divided into 1,911 genera and 13 subfamilies. The importance of the Asteraceae in traditional medicine and for food purposes is reported since antiquity and from different parts of the world. Despite the discovery of several secondary metabolites in Asteraceae they attracted disproportionately little attention in the context of ethnopharmacological research, resulting in few systematic explorations and few commercialized products. The focus of this Research Topic is to make a special contribution to the ethnopharmacology of Asteraceae, considering their phytochemistry (as it relates to medical uses) and molecular pharmacology of their secondary metabolites. This special issue consists of five articles covering diverse topics related to the pharmacology of Asteraceae species.
One of the most important genera of the Asteraceae is probably Artemisia as it is used worldwide in traditional medicine, as a source for spices (e.g. Artemisia dracunculus), ingredient for liquors (e.g. Artemisia absinthium) and as a source for artemisinin. The discovery of artemisinin and avermectin fundamentally changed the treatment of malaria around the globe and led to the awarding of the Nobel Prize in Physiology or Medicine 2015 (Chen, 2016).
With advancements in mass spectrometry, Olennikov et al. (2018) studied twelve Siberian Artemisia species identifying 112 individual phenolic compounds through LC and MS analysis. Interestingly, the chemical profile appears to be very different between the analyzed species including rare plant phenolics, such as coumarin-hemiterpene ethers (lacarol derivatives) from A. latifolia and A. tanacetifolia; melilotoside from A. tanacetifolia; dihydrochalcones (davidigenin analogs) from A. palustris; chrysoeriol glucosides from A. anethifolia, A. sericea and A. umbrosa; eriodictyol glycosides from A. messerschmidtiana; and also some uncommon flavones and flavonols. Several of these Artemisia spp. are used in Siberia for the treatment of diabetes (Shah, 2014) and therefore a phytochemical and pharmacologic assessment was expected to provide interesting insights. In a series of in vitro assays, the Artemisia extracts showed inhibitory activity against principal enzymes of carbohydrate metabolism, such as α-amylase and α-glucosidase. The results obtained by Olennikov et al. (2018) reveal that Siberian Artemisia species have the potential to be useful in the development of alternative drugs for controlling diabetes.
In a very elegant research, Fattori et al. ( 2018) assessed the antinociceptive and anti-inflammatory potential of budlein A, a sesquiterpene lactone obtained from Viguiera robusta in a model of acute gout arthritis in mice. Gout was induced by intra-articular injection of monosodium urate (MSU; 100 μg/10 μL). Animals pre-treated with budlein A (1 or 10 mg/kg; 30 min prior the inflammation induction) showed lower levels of knee joint edema and mechanical hypersensitivity than the control group. These effects were shown to be associated with reduced recruitment of neutrophils and consequently reduced phagocytosis of MSU crystals by neutrophils. The pre-treatment with budlein A also lowered the transcription of expression of IL-1β and TNF-α genes in the knee joint. The results suggested the inhibition of NF-κB activation and impairment of the inflammasome assembly. Taken together, these findings suggest that budlein A might be used as a lead molecule for the treatment of certain inflammatory conditions.
Several plants from Asteraceae are used to treat infection with parasites but the active compounds are not well studied (Panda and Luyten, 2018). A review article by Moraes Neto et al. (2019) discusses the aptitude of several Asteraceae plants for the development of drugs and pharmaceutical formulations against Leishmaniasis and Chagas disease, two neglected tropical diseases. Several Asteraceae derived compounds are highlighted based on their high selective activity against these protozoan parasites. Artemisinin and its derivatives, which showed activity against Leishmania donovani, L. infantum, and L. major, are attracted scientist from nanoscience as nanoliposomal artemisinin proves effective in vivo mice model (Want et al., 2017). Psilostachyin (sesquiterpene from Ambrosia tenuifolia) is another interesting compound that showed in vivo efficacy against L. mexicana and T. cruzi. Furthermore, the sesquiterpene lactone deoxymikanolide obtained from Mikania micrantha showed in vivo activity against T. cruzi. It is also important to emphasize that the essential oils obtained from Asteraceae species are sources of bioactive compounds against trypanosomatids, in particular those from the genus Artemisia.
The capacity to promote wound healing is another well-known effect of certain Asteraceae species and many Asteraceae are used for the treatment of skin lesions by traditional communities and in herbal medicine worldwide. Carvalho et al. (2018) reviewed several Asteraceae species and their associated compounds with wound-healing properties. Silibinin (obtained from Silybum marianum (L.) Gaertn), for example, showed high efficacy in different models of skin pathologies, such as toxic effects caused by nitrogen mustard in the mouse skin as well as experimental wounds. Other exciting results were seen in clinical trials focusing on complicated wounds including venous leg ulcers and foot ulcers of diabetic patients (Carvalho et al., 2018) including Ageratina pichinchensis (Kunth) R.M. King and H. Rob. and Calendula officinalis L. Overall, the review by Carvalho et al. (2018) suggests that Asteraceae represent important sources for wound-healing compounds.
Costunolide (CST), a sesquiterpene lactone obtained from Vladimiria souliei (Franch.) Ling, is known to exhibit anti-inflammatory, anti-viral, and anti-tumor activities (Peng et al., 2017) while its potentially beneficial effects on liver injury are poorly understood. Mao et al. (2018) therefore investigated the hepatoprotective effects of CST against lipopolysaccharide and D-galactosamine-induced acute liver injury in mice. The authors observed that CST (40 mg/kg) could significantly improve the pathological changes of hepatic tissue and that it reduced the lipopolysaccharide and D-galactosamine-induced increment of alanine aminotransferase and aspartate aminotransferase activities in the serum. Further data indicated that CST significantly reduces formation of malondialdehyde and reactive oxygen species and that it increased the activity of antioxidant enzymes in the hepatic tissues. Western blot data revealed that CST triggers the anti-oxidative defense system by inhibiting kelch-like ECH-associated protein 1 and nuclear factor-related factor 2 (in the cytosol and the nucleus), heme oxygenase-1 and NAD(P)H quinone oxidoreductase 1 activity. Moreover, CST led to a significant decrease in the protein expression of pro-inflammatory cytokines including IL 1β, IL 6, and TNF. The authors conclude that CST may be a potential therapeutic agent for attenuating acute liver injury.
The present Research Topic thus includes interdisciplinary research work expanding the knowledge about traditional uses of Asteraceae fostering the scientific field of ethnopharmacology globally. This research topic successfully gathered comprehensive information in the field of drug discovery related to diabetes, cancer and human parasitosis. Further, several bioactive compounds were characterized with regard of their molecular mechanisms action related to wound-healing and inflammation at large. We hope that this article collection will inspire scientists from different fields of research focusing on the assessment of traditional medicine, derived from Asteraceae or other plant families, in the search for new pharmacological strategies.

Keywords: Asteraceae, drug discovery, phytochemistry, anti-diabetic, Anti-apoptosis, anti-inflammatory, Antiparasitic,, Wound healing property

Received: 05 Jul 2019; Accepted: 26 Jul 2019.

Edited by:

Michael Heinrich, UCL School of Pharmacy, United Kingdom

Copyright: © 2019 Panda, da Silva, SAHAL and Leonti. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Sujogya K. Panda, North Orissa University, Baripada, India, sujogyapanda@gmail.com