Inter-Culturel | 24 mars 2020
Advocacy for the implementation of clinical trials of Artemisia herbal tea in the fight against Covid19 in Rwanda
We have initiated a study and reflection group on care practices, research in phytotherapy, the links between conventional and traditional medicines and the recognition and structuration of the profession of traditional practitioner.
Within the framework of our activities, we supports advocacy and lobbying actions.
It is within this framework that we produce the present document, in collaboration with NGOs, researchers and doctors.
Inter-Culturel | 24 mars 2020
Advocacy for the implementation of clinical trials of Artemisia herbal tea in the fight against Covid19 in Rwanda
Antiviral herbal medicines have been used during many historical epidemics. This therapeutic approach is not an outdated practice. Thus, it has been used in the two previous coronavirus outbreaks - MERS-CoV in 2012, SARS-CoV in 2013 - or in recent seasonal epidemics caused by influenza and dengue viruses.
The review of the scientific literature shows that “extracts of Lycoris radiata, Artemisia annua and Lindera aggregate, as well as extracts of Isatis indigotica, Torreya nucifera and Houttuynia cordata, have shown anti-SARS effects”. Clinical trials have also shown that the plant flavone baicaléine can prevent or limit the entry of the dengue virus into the host and inhibit virus replication after it has entered the host. Additionally, natural products derived from the roots of Pelargonium sidoides and Taraxacum officinale (dandelion) have anti-influenza activities as they inhibit virus entry and key viral enzyme activities. 
As a complementary treatment, herbal antiviral drugs can increase cure rates when combined with other treatments. Recent information reports that Chinese Health authorities announced in an article published in March 2020 that “for 90% of the Covid19 positive cases, they administered Artemisia annua (Qing Hao) as a complementary treatment for moderate pulmonary syndromes. ” This complementary treatment may have contributed to contain the epidemic in China.
In an emergency situation such as the current Covid19 pandemic, and in the absence of conventional treatment, the development of efficient synthetic drugs or possible vaccines is subject to the time frame of research and validation protocols through clinical trials.
Readily available herbal medicine and natural products with proven safety can save time and be used a first line of defence.
In order to contribute to the reflection on the policies to be carried out to effectively combat the current pandemic, Inter-Culturel consultancy office, in close collaboration with doctors, researchers and specialists in these plants, has undertaken to gather the existing scientific information to make it available to the health authorities and to all the actors involved in the search for treatments and care protocols suitable for helping people who have contracted or are exposed to Covid19.
The file below brings together available research data on the antiviral properties and potential uses of Artemisia annua and afra in the context of the current health emergency.
Attached to this file is the document “Call for projects to combat Covid19: preventing and mitigating the epidemic with Artemisia annua”, written by the NGO La Maison de l’Artemisia, which offers a proposal for a clinical trial that could inspire health policy makers.
Artemisia species, particularly Artemisia annua (the annual wormwood) and Artemisia afra (the African wormwood) are well known for their antimalarial properties, which have been extensively studied and validated by clinical trials.
Their antiviral properties have been less studied, but the studies published to date are promising.
They open up a line of research that should be encouraged in the current race against time to find a cure for the Covid19 pandemic.
The scientific studies already carried out on Artemisia species show :
⇒ the antiviral potential of the plant taken in the form of herbal tea or powder;
⇒ the antiviral potential of some of its compounds: phytosterols, quercetin, luteolin, β-sitosterol, stigmasterol and tannins;
⇒ the synergy of these compounds when the extract of the totum of the foliar parts of the plant is administered;
⇒ the immunostimulatory potential of the plant;
⇒ the efficacy of administering medicinal decoctions including Artemisia annua in addition to conventional treatments to alleviate symptoms;
⇒ the absence of toxicity of the infusion or powder of the plant.
Considering on the one hand that cases, to date anecdotal but increasing in number, suggest that taking Artemisia annua herbal tea has had a curative effect on patients infected with Covid19 and that other cases tend to show that it would also have a preventive effect ;
considering, on the other hand, the current lack of available treatment for the deleterious effects of Covid19 ;
considering, finally, the availability of the resource in Rwanda, and the presence of researchers who have studied the plant and its properties ;
we believe that the conduct of clinical trials based on the taking of Artemisia annua and afra herbal tea should be very quickly encouraged, as the taking of Artemisia annua or afra herbal tea as a preventive measure, especially for particularly exposed persons such as health care personnel.
Antiviral potential of Artemisia annua and afra
Several species of Artemisia have antiviral properties. This virus inhibitory activity was first described by Indian researchers in 1991 :
M.M. Abid Ali Khan, D.C. Jain, R.S. Bhakuni, Mohd. Zaim and R.S. Thakur
Occurrence of some antiviral sterols in Artemisia annua
Plant Science (Ireland) 75, 161-165., 1991
The research team evaluated the virus inhibitory activity of 21 plants against tobamovirus. Among the plant extracts tested, extracts of Lawsonia alba, Artemisia annua and Cornus capitata showed the highest virus inhibitory activity.
The authors comment on the results of their research as follows :
« Antiviral screening of higher plants has shown that some of them contain highly potent inhibitors of plant viruses which display varying degree of inhibition. This during our screening programme A. annua, L. alba and C. capitata plants were found to possess virus inhibitors.
Only a very few inhibitors have been fully characterized, and these show striking chemical variation. Some inhibitors were characterized as glycoproteins, protein and polypeptide in nature while other inhibitors showed the characteristics of carbohydrates or polysaccharides. Similarly the virus inhibition by strawberry and raspberry leaf extract was due to the presence of phenolic tannins and the inhibitor of Begonia tuberhybrida was identified as oxalic acid. In stone fruit plants e.g. Prunus sp. the inhibitor were of flavonoid in nature and related to guercitin .
Similarly the steroidal, triterpenoid glycosides and volatile constitutents of plant origin have been shown to possess virus inhibitory activity. The range of their molecular weights varied greatly. However, the nature of a virus inhibitor present in A. annua was identified as a mixture of low molecular weight sterols which was further separated and identified as sitosterol and stigmasterol.
Further the suggestion that these antiviral sterols affects hosts rather than viruses is supported by the fact that the number of lesions produced are reduced when the compound applied first followed by virus inoculation and evidence was found for reduction of lesion size viz. diameter of lesion. This is the first report on sterols present in A. annua plant showing virus inhibitory activity. »
This research suggests that Artemisia annua antiviral agents are sterols, and that their virus-inhibiting effect is related to their protective action on virus hosts.
By comparing the antiviral effect of 7 species of Artemisia, a 2011 study showed that among the wormwood species evaluated, the effect of Artemisia annua was always the strongest and that the plant extract was often more potent than that of the synthetic antiviral Acyclovir against Herpes Simplex virus type 1 (HSV1) in vitro.
MK Karamoddini, SA Emami, MS Ghannad, A Sahebcar.
Antiviral activities of aerial subsets of Artemisia species against Herpes Simplex virus type 1 (HSV1) in vitro
Asian Biomedicine vol 5-1, 2011, 63-6
After screening more than 200 Chinese medicinal plant extracts for their antiviral activity against the coronavirus associated with severe acute respiratory syndrome (SARS-CoV), extracts from 4 of these plants - Lycoris radiata, Artemisia annua, Pyrrosia lingua and Lindera aggregata - showed significant inhibition effects on the virus when SARS-CoV strain BJ001 was used for screening.
The dose dependence of the antiviral activities has been determined by serial dilutions of the compounds. Lycoris radiata extract was the most potent. The second was Artemisia annua extract:
Shi-you Li, Cong Chen, Hai-qing Zhang, Hai-yan Guo, Hui Wang, Lin Wang a,b , Xiang Zhang c , Shi-neng Hua, Jun Yu, Pei-gen Xiao, Rong-song Li, Xuehai Tan,
Identification of natural compounds with antiviral activities against SARS-associated coronavirus
Antiviral Research 67 (2005) 18-23, © 2005 Elsevier B.V
Vincent Cheng & al (2007), also mention Artemisia annua as one of the promising antiviral and immunomodulatory agents tested against the SARS CoV in animals and in vitro:
Vincent C. C. Cheng, Susanna K. P. Lau, Patrick C. Y. Woo, et Kwok Yung Yuen
Severe Acute Respiratory Syndrome Coronavirus as an Agent of Emerging and Reemerging Infection
Clinical Microbiology Reviews, Oct. 2007, p. 660-694 Vol. 20, No. 4
Researchers from Leiden University provided in 2012 “a quantitative measure of the in vitro anti-HIV activity of Artemisia annua and Artemisia afra”:
« The objective of this study was to provide quantitative scientific evidence that the Artemisia annua tea infusion exhibits anti-HIV activity through in vitro studies. A second objective was to determine if artemisinin plays a direct or indirect (synergistic) role in any observed activity. This was done by the inclusion of a chemically closely related species, Artemisia afra, known not to contain any artemisinin in our studies.
Materials and methods: Validated cellular systems were used to test Artemisia annua tea samples for anti-HIV activity. Two independent tests with different formats (an infection format and a co-cultivation format) were used. Samples were also tested for cellular toxicity against the human cells used in the assays.
Results: The Artemisia annua tea infusion was found to be highly active with IC 50 values as low as 2.0 μg/mL. Moreover we found that artemisinin was inactive at 25 μg/mL and that a chemically related species Artemisia afra (not containing artemisinin) showed a similar level of activity. This indicates that the rôle of artemisinin, directly or indirectly (synergism), in the observed activity is rather limited. Additionally, no cellular toxicity was seen for the tea infusion at the highest concentrations tested.
Conclusion: This study provides the first in vitro evidence of anti-HIV activity of the Artemisia annua tea infusion. We also report for the first time on the anti-HIV activity of Artemisia afra although this was not an objective of this study. These results open the way to identify new active pharmaceutical ingredients in Artemisia annua and thereby potentially reduce the cost for the production of the important antimalarial compound artemisinin. »
Andrea Lubbe, Isabell Seibert, Thomas Klimkait, Frank van der Kooy.
Ethnopharmacology in overdrive: The remarkable anti-HIV activity of Artemisia annua
Journal of Ethnopharmacology (2012) JEP-7371
Antiviral active phytochemicals compounds of Artemisias
A Chinese study, published in 2003, supports the discovery made a decade earlier of the antiviral potential of Artemisia annua sterols. According to the authors of the publication, sterols from Artemisia annua have superior antiviral properties compared to other Artemisia annua molecules, such as artemisinin. The researchers also claim that Artemisia annua has greater antiviral activity than the other 20 medicinal plants tested :
Xiangjie Sun and Gary R. Whittaker.
Role for Influenza Virus Envelope Cholesterol in Virus Entry and Infection
Journal of Virologie. 2003 Dec; 77(23): 12543–12551
While sterols have been identified as the most active antiviral agents in the plant, they are not the only active compounds that inhibit plant viruses.
A study published in 2008 shows that the bioactivity of artemisinin and its semi-synthetic derivative, artesunate, is not reduced to its antimalarial action but also includes the inhibition of certain viruses, such as human cytomegalovirus and other members of the herpesviridae family (e.g. herpes simplex virus type 1 and Epstein-Barr virus), hepatitis B virus, hepatitis C virus and bovine viral diarrhoea virus :
« Traditional Chinese medicine commands a unique position among all traditional medicines because of its 5000 years of history. Our own interest in natural products from traditional Chinese medicine was triggered in the 1990s, by artemisinin-type sesquiterpene lactones from Artemisia annua L. As demonstrated in recent years, this class of compounds has activity against malaria, cancer cells, and schistosomiasis. Interestingly, the bioactivity of artemisinin and its semisynthetic derivative artesunate is even broader and includes the inhibition of certain viruses, such as human cytomegalovirus and other members of the Herpesviridae family (e.g., herpes simplex virus type 1 and Epstein-Barr virus), hepatitis B virus, hepatitis C virus, and bovine viral diarrhea virus.
Analysis of the complete profile of the pharmacological activities and molecular modes of action of artemisinin and artesunate and their performance in clinical trials will further elucidate the full antimicrobial potential of these versatile pharmacological tools from nature. »
Efferth T, Romero MR, Wolf DG, Stamminger T, Marin. JJG, Marschall M.
The antiviral activities of artemisinin and artesunate.
Clin Infect Dis. 2008; 47:804-11
The antiviral potential of artemisinin contained in Artemisia annua has also been demonstrated by the following studies:
Romero Marta, Serrano Maria, Vallejo Marta, Efferth Thomas; Alvarez, Marcelino; Marin, Jose,
Antiviral Effect of Artemisinin from Artemisia annua against a Model Member of the Flaviviridae Family, the Bovine Viral Diarrhoea Virus (BVDV),
Planta Medica 72(13):1169-74, November 2006
Marta R. Romero, Thomas Efferth, Maria A. Serrano, Beatriz Castaño, Rocio I.R. Macias, Oscar Briz, Jose J.G. Marin,
Effect of artemisinin/artesunate as inhibitors of hepatitis B virus production in an “in vitro” replicative system,
Antiviral Research 68 (2005) 75–83
Another active compound present in different Artemisia species, of which Artemisa annua and afra, is also identify to have antiviral action. This is quercetin, which has been shown to be a broad-spectrum antiviral.
This flavonoid is one of the active compounds in Artemisia :
J.F.S. Ferreira, Dave Luthria, Tomikazu Sasaki, Arne Heyerick
Flavonoids from Artemisia annua L. as Antioxidants and Their Potential Synergism with Artemisinin against Malaria and Cancer
Molecules 2010, 15, 3135-3170
Yang GE, Bao L, Zhang XQ, Wang Y, Li Q, Zhang WK, Ye WC
Studies on flavonoids and their antioxidant activities of Artemisia annua
Zhong Yao Cai. 2009 Nov; 32(11): 1683-6
James T. Mukindaa, James A. Sycea, David Fisher, Mervin Meyer
Effect of the Plant Matrix on the Uptake of Luteolin Derivatives-containing Artemisia afra Aqueous-extract in Caco-2 cells
Journal of Ethnopharmacology 130 (2010) 439–449
The antiviral property of quercetin has been identified as early as 1985:
Tej N. Kaul, Elliott Middleton, Jr., and Pearay L. Ogra
Antiviral Effect of Flavonoids on Human Viruses
Journal of Medical Virology l5:71-79 (1985)
A Chinese research team found that quercetin inhibits influenza A infection with a broad spectrum of strains. Mechanism studies showed that quercetin interacted with the HA2 subunit.
In addition, quercetin may inhibit the entry of H5N1 virus. This study indicates that quercetin, which has inhibitory activity in the early stage of influenza infection, also offers a therapeutic option for the development of effective, safe and affordable natural products for the treatment and prophylaxis of influenza A infections.
« Influenza A viruses (IAVs) cause seasonal pandemics and epidemics with high morbidity and mortality, which calls for effective anti-IAV agents.
The glycoprotein hemagglutinin of influenza virus plays a crucial role in the initial stage of virus infection, making it a potential target for anti-influenza therapeutics development.
Here we found that quercetin inhibited influenza infection with a wide spectrum of strains, including A/Puerto Rico/8/34 (H1N1), A/FM-1/47/1 (H1N1), and A/Aichi/2/68 (H3N2) with half maximal inhibitory concentration (IC50) of 7.756 ± 1.097, 6.225 ± 0.467, and 2.738 ± 1.931 μg/mL, respectively. Mechanism studies identified that quercetin showed interaction with the HA2 subunit.
Moreover, quercetin could inhibit the entry of the H5N1 virus using the pseudovirus-based drug screening system. This study indicates that quercetin showing inhibitory activity in the early stage of influenza infection provides a future therapeutic option to develop effective, safe and affordable natural products for the treatment and prophylaxis of IAV infections. »
Wenjiao Wu, Richan Li, Xianglian Li, Jian He, Shibo Jiang, Shuwen Liu, and Jie Yang
Quercetin as an Antiviral Agent Inhibits Influenza A Virus (IAV)
Viruses, Volume: 8, Issue: 1, pp. 6
The antiviral property of quercetin has also been demonstrated against the Dengue virus:
« Conclusion: Results from the study suggest that only quercetin demonstrated significant anti-DENV-2 inhibitory activities. Other bioflavonoids, including daidzein, naringin and hesperetin showed minimal to no significant inhibition of DENV-2 virus replication.
These findings, together with those previously reported suggest that select group of bioflavonoids including quercetin and fisetin, exhibited significant inhibitory activities against dengue virus.
This group of flavonoids, flavonol, could be investigated further to discover the common mechanisms of inhibition of dengue virus replication. »
Keivan Zandi, Boon-Teong Teoh, Sing-Sin Sam,
Pooi-Fong Wong, Mohd Rais Mustafa and Sazaly AbuBakar,
Antiviral activity of four types of bioflavonoid against dengue virus type-2a
Virology Journal 2011, 8:560
More recently, this bioflavonoid has been identified as a potential inhibitor of Covid19 in early March 2020.
«Therefore, nelfinavir and lopinavir may represent potential treatment options, and kaempferol, quercetin, luteolin-7-glucoside, demethoxycurcumin, naringenin, apigenin-7-glucoside, oleuropein, curcumin, catechin, and epicatechin-gallate appeared to have the best potential to act as COVID-19 Mpro inhibitors. However, further research is necessary to investigate their potential medicinal use.»
Siti Khaerunnisa, Hendra Kurniawan, Rizki Awaluddin,
Suhartati Suhartati, Soetjipto Soetjipto,
Potential Inhibitor of COVID-19 Main Protease (Mpro) from Several Medicinal Plant Compounds by Molecular Docking Studya
Preprints, 13 March 2020.
Furthermore, a team of researchers from the Clinical Research Institute of Montreal (IRCM), led by Dr. Michel Chrétien, has received an official invitation from China to supervise a clinical trial and, if successful, plan to add quercetin to the therapeutic arsenal to counteract the Covid19 epidemic.
Another antiviral flavonoid found in various species of Artemisia that have antimalarial properties is luteolin. This compound is particularly present in the species Artemisia annua and Artemisia afra.
This substance has, among others, anti-inflammatory, antituberculosis and antiviral properties.
Wenwen Dai, Jinpeng Bi, Fang Li, Shuai Wang, Xinyu Huang, Xiangyu Meng, Bo Sun, Deli Wang, Wei Kong, Chunlai Jiang and Weiheng Su
Antiviral Efficacy of Flavonoids against Enterovirus 71 Infection in Vitro and in Newborn Mice
Like quercetin, luteolin has been identified as a potential inhibitor of Covid19:
Siti Khaerunnisa, Hendra Kurniawan, Rizki Awaluddin, Suhartati Suhartati, Soetjipto Soetjipto,
Potential Inhibitor of COVID-19 Main Protease (Mpro) from Several Medicinal Plant Compounds by Molecular Docking Study
Preprints, 13 March 2020
It is worth noting that the intestinal absorption of luteolin from aqueous plant extracts is up to 5 times higher than for pure luteolin:
Zhou P, Li LP, Luo SQ, Jiang HD, Zeng S.
Intestinal absorption of luteolin from peanut hull extract is more efficient than that from individual pure luteolin,
Journal of Food Chemistry. 9-56, 2008, 296-300.
This fact has been confirmed in another research work conducted by JT. Mukinda et al. in 2010:
James T. Mukinda; James A. Syce; David Fisher; Mervin Meyer,
Effect of the plant matrix on the uptake of luteolin derivatives-containing Artemisia afra aqueous-extract in Caco-2 cellsa
Journal of Ethnopharmacology. 2010 Aug 9; 130(3): 439-49.
⇒ β-sitosterol and stigmasterol
The antiviral effect of β-sitosterol and stigmasterol of Artemisia annua is well known to the Chinese for 30 years :
Tan RV, Zheng WF, Tang HQ.
Biologically active substances from the genus Artemisia
Planta Med. 1998; 64:295-302.
However, according to researchers, this antiviral effect is not an inherent property of these molecules, but is attributed to the increased activity of the cell-mediated immune response that controls viral replication.
The use of a combination of β-sitosterol and β-sitosterol glucoside to treat HIV infection stabilizes CD4 cells in infected people and reduces IL-6. The antiviral properties of β-sitosterol and β-sitosterol glucoside have been patented. The patent holders describe the effects in an article published in 1999 :
Bouic PJ, Lamprecht JH.
Plant sterols and sterolins: a review of their immune-modulating properties
Altern Med Rev. 1999 Jun;4(3):170-7.
Proanthocyanidins, or condensed tannins, have mainly been studied for their antioxidant properties. Artemisia afra has a very high level of proanthocyanidins: 19,900 mg/100g :
Taofik O. Sunmonu, Anthony J. Afolayan
Evaluation of Polyphenolic Content and Antioxidant Activity of Artemisia Afra Jacq. Ex Willd. Aqueous Extract
Pakistan Journal of Nutrition 2012, 11, 520-525
In Artemisia annua the rate is lower but still important: 340 mg/100 g in the leaves of Artemisia annua and only 30 mg/100 g in the stems :
M Mazandarani et al.,
Essential Oil Composition, Total Phenol, Flavonoid, Anthocyanin and Antioxidant Activities in Different Parts of Artemisia annua L. in Two Localities (North of Iran)
Journal of Medicinal Plants and By-products (2012) 1: 13-21
A Chinese study tested the inhibitory effects of condensed tannins of Artemisia annua on herpes simplex virus type 2 and hepatitis B virus. Regarding the inhibition of herpes simplex virus type 2, the results showed that the condensed tannin of Artemisia annua was as effective as the conventional drug, Acyclovir.
With regard to hepatitis virus, the results showed that the condensed tannin of Artemisia annua exhibited mild cytotoxicity at 2.5 mg/mL and could significantly inhibit the secretion of HBeAg in the HepG184.108.40.206 cell line.
The overall results of this research suggest that the condensed tannins of Artemisia annua have a high selectivity index against herpes simplex virus type 2 and hepatitis B virus :
Zhang JF , Tan J , Pu Q , et al.
A study on antiviral activity of Condensed Tannin of Artemisia annua.
Res Dev, Nat Prod 2004 ; 16 ( 4 ) : 307 – 11
Tannins in Artemisia: hidden treasure for prophylaxis
October 9, 2016
Artemisias have been used for thousands of years in China (Artemisia annua) and South Africa (Artemisia afra) and no toxic effects have been observed.
Concerning the contemporary period, the most convincing human trial on Artemisia annua plant toxicity comes from Uganda. This long-running experiment has been studied by the researcher Patrick Ogwang. In the Wagagai flower farm, more than 2000 workers have been drinking Artemisia tea every week since 2006. No negative effects were observed and malaria is no longer a problem for farm workers.
Professor Pamela Weathers of Worcester Polytechnic Institute, who has been studying Artemisia annua for several decades, says:
« In all our animal studies using mainly mice, but also rabbits and rats, we have never observed any toxicity of up to 100 mg of Artemisia annua-delivered artemisinin per kg animal body weight. Indeed, in several trials powdered Artemisia leaves were gavaged daily into mice for up to 9 and 14 days, respectively, with no adverse effects on any of the animals. »
No toxicity detected for Artemisia annua or afra
Review published online on August 5, 2019 on Malariaworld.org
The lack of plant toxicity is demonstrated by numerous researches :
Meshnick., Jorge Ferreira & Jules Janick
Annual Wormwood (Artemisia annua L.)
International Journal for Parasitology. 2002 Volume: 32, Issue: 13, Pages: 1655-1660
Yang B, Zhou S, Li C, Wang Y
Toxicity and side effects of artemisiae annuae
Zhongguo Zhong Yao Za Zhi. 2010 Jan;35(2):204-7
Mbeh Ubana Eteng
Biochemical and Haematological Evaluation of Repeated Dose Exposure of Male Wistar Rats to an Ethanolic Extract of Artemisia annua
Phytotherapy Research. 2013, 04 2
Mukinda JT, Syce JA.
Acute and chronic toxicity of the aqueous extract of Artemisia afra in rodents
Journal of Ethnopharmacology. volume 112, issue 1 (2007) 138-44
Etude préliminaire à l’utilisation d’une phytothérapie d’Artemisia annua à l’usage d’enfants < 5 ans
Thèse de doctorat en pharmacie, Université des Montagnes, 2011
Idris Ahmed Issa and Mohammed Hussen Bule
Hypoglycemic Effect of Aqueous and Methanolic Extract of Artemisia afra on Alloxan Induced Diabetic Swiss Albino Mice.
Evidence-Based Complementary and Alternative Medicine Volume 2015 (2015)
Many studies have shown that Artemisia annua is not only free of toxicity over a wide dosing gradient, but also stimulates the immune system. This effect is attributed to constituents other than artemisinin: essential oils, flavonoids, coumarins, polysaccharides, saponins, tannins, pentacyclic triterpenes.
A research from Université des Montagnes in Cameroon even indicates that Artemisia annua tea lowers alanine aminotransferase and could be hepatoprotective :
Nkuitchou - Chougouo K. Rosien D., Kouamouo Jonas, Titilayo O. Johnson, Djeungoue P. Marie-Ange, Chuisseu Pascal, Jaryum, Kouemeni Lysette, Lutgen Pierre , Tane Pierre, Moudipa F. Paul
Comparative study of Hepatoprotective and Antioxidant Activities of Artesunate and Artemisia annua Flavonoids on rats hepatocytes
Pharmacognosy conference Sao Paolo, Aug 29-30, 2016
Only one isolated case of liver toxicity has been identified in the scientific literature, when other studies suggest that the plant generally has an hepatoprotective effect :
Francisco J. Ruperti-Repilado, Simon Haefliger, Sophia Rehm, Markus Zweier, Katharina M. Rentsch, Johannes Blum, Alexander Jetter, Markus Heim, Anne Leuppi-Taegtmeyer, Luigi Terracciano &Christine Bernsmeier
Danger of Herbal Tea: A Case of Acute Cholestatic Hepatitis Due to Artemisia annua Tea
Frontiers in Medicine, 1 October 2019, Volume 6; Article 221
Note on the search for plant-based treatments
In the context of the current health emergency and the lack of efficient treatment solution for patients affected by Covid19 and in view of the fatal risks for some of the patients, conventional research protocols are proving inadequate.
Indeed, the process leading to the validation of a synthetic drug is very long and, while it may be relevant in normal times, is proving to be inadequate in times of pandemic and generalized crisis.
The journal, Nature Plants has clearly posed the dilemma of finding therapeutic solutions in times of health crisis. Here is a large excerpt from its March 2020 editorial:
« The complicated secondary metabolism of plants has been the source of countless medicinal compounds and leads for drug discovery. It is little surprise then that plant products and their analogues have been employed as an early line of defence against COVID-19. On 17 February, the Chinese State Council announced that chloroquine phosphate — a structural analogue of quinine, originally extracted from the bark of cinchona trees — can be used for treating COVID-19 patients. This anti-malarial also has broad-spectrum antiviral activity and regulatory effects on the immune system. Clinical evaluation of chloroquine phosphate in more than ten hospitals across several provinces in China has shown that it alleviates the symptoms for most patients and expedites virus seroconversion.
The epidemiologist Nanshan Zhong, who is credited with discovering the SARS coronavirus in 2003 and is advising on the management of the COVID-19 outbreak, has said that chloroquine phosphate is not a highly effective cure but its effects deserve attention, even though its pharmaceutical mechanism remains unclear. However, quinine and quinine derivatives have been used for two hundred years, and the bark from which it is extracted for far longer. Their safe usage and potential side effects are well established.
The rich tradition of herbal medicine in China is also being deployed against COVID-19.
In the newest version of the diagnosis and treatment plan issued by the National Health of Commission of China, traditional Chinese medicine decoctions are explicitly recommended.
Several patent herbal drugs, such as Huoxiang Zhengqi capsules, Lianhua Qingwen capsules and Radix isatidis granula, are being proposed as treatments, the latter two having also been used during the SARS-CoV outbreak in 2003.
Compared to chemical drugs, herbal medicines and plant natural products are less understood mechanistically, but several clinical investigations have been started to more precisely evaluate their effects.
In routine drug development, researchers first discover a drug molecule with potential therapeutic activity against a certain target, then optimize its structure and validate its function using in vitro experiments followed by animal and clinical trials.
By contrast, many herbal drugs have been used in clinics for hundreds or thousands of years, and thus their safety and effects have been repeatedly tested; chloroquine phosphate has been used to treat malaria for over 70 years.
Timeliness is another advantage, particularly during emergencies. Once a herbal decoction or component is found to be effective, it can be immediately used for treating patients, its safety already established. »
Redeploying plant defences
Nat. Plants 6, 177 (2020).
Considering on the one hand all researches carried out on Artemisia annua antiviral properties, these isolated compounds, and their potential synergy when the leaves and stems of the plant are administered in infusion or powder form, and considering, on the other hand, the lack of toxicity of the plant, the conditions are fulfilled to carry out clinical trials in the current health emergency context created by the worldwide diffusion of Covid19.
The writing of this review of the scientific literature by Inter-Culturel office team was concomitant with exchanges with the French NGO La Maison de l’Artemisia, which drew up a proposal for a clinical trial protocol presented in the document “Call for projects to combat COVID19 : preventing and mitigating the epidemic with Artemisia annua”: “Randomized controlled trial on the antiviral efficacy and safety of a decoction-based preparation of Artemisia annua for the treatment of COVID-19 patients (ARTCOV)”.
If the Rwandan health authorities deemed it appropriate, such clinical trials could be launched very quickly due to the availability of Artemisia annua in Rwanda. A precise location of Artemisia annua stocks available in Rwanda should then be carried out quickly in order to be able to send as soon as possible the necessary quantities for this trial to researchers and to the people who are the most at risk (health care workers, garbage collectors, food stores cashiers, public transport drivers, police and security forces...).
Indeed, Rwanda has not yet reached its peak of Covid19 contamination and it is necessary, in order to extend the efforts of the Rwandan Government, to do everything possible to test all possible clinical options before reaching it.
As recalled in the “Call for projects to combat Covid19” launched by NGO La Maison de l’Artemisia: “the potential benefit of such a study is therefore gigantic in view of the low investment required to carry out these clinical trials. This is a possible treatment route for the disease. We cannot afford to miss such an opportunity.”
Note on the traditional uses of Artemisia annua & Artemisia afra
The traditional medicinal use of a plant is considered to be established if documentary evidences can be gathered that a substance has been used for at least three generations for a specific health-related or medicinal use.
This information is important because in this case, the WHO considers that pre-clinical toxicity testing is not necessary, as traditional use and the lack of toxicity claims is considered to be evidence of the safety of the plant in accordance with medicinal practices. Preclinical toxicity testing is only required for new herbal medicinal products with no history of traditional use.
Artemisia annua traditional uses
Of Chinese origin, Artemisia annua has been part of the pharmacopoeia in this part of the world for at least 2000 years, particularly for the treatment of malaria:
Geldre EV, Pauw ID, Inze D, Montagu MV, Eeckhout EV (2000)
Cloning and molecular analysis of two new sesquiterpene
cyclases from Artemisia annua L.
Plant Sci 158:163–171
Meier zu Biesen C (2010)
The rise to prominence of Artemisia annua L.
The transformation of a Chinese plant to a global pharmaceutical.
Afr Sociol Rev 14(2):24–46
A compendium of Chinese plant usage entitled “Fifty-two Prescriptions”, dating from 168 BC, mentions Artemisia annua (Qing Hao) as a medicinal herb.
The Chinese treatise on materia medica “Shennong ben cao jing”, dating from the first century AD, and quoted in later works, documents the use of Artemisia annua as a food preservative, a remedy against summer heat and for the treatment of ’intermittent fevers’, a typical symptom of malaria fevers.
The “Manual of Prescriptions for Emergency Treatment” (Zhouhou Beiji Fang), dating from the fourth century AD, also describes a number of traditional medicinal preparations using Artemisia annua:
Willcox M (2009)
Artemisia species: from traditional medicines
to modern antimalarials and back again.
J Altern Complement Med 15(2):101–109
The Pharmacopoeia of People’s Republic of China also describes its use in the treatment of tuberculosis and jaundice:
WHO Library cataloguing-in-publication data (2006)
WHO monograph on good agricultural and collection practices (GACP) for Artemisia annua L.
World Health Organization (ISBN 924 1594438)
Castilho PC, Gouveia SC, Rodrigues AI (2008)
Quantification of artemisinin in Artemisia annua extracts by 1H-NMR.
Phytochem Anal 9(4):329–334
Liu H. et al. mention the traditional use of Artemisia annua for wound healing in China :
Liu H, Tian X, Zhang Y, Wang C, Jiang H (2013)
The discovery of Artemisia annua L. in the Shengjindian cemetery, Xinjiang, China and its implications for early uses of traditional Chinese herbal medicine qinghao.
J Ethnopharmacol 146(1):278–286.
Artemisia annua is also traditionally used in Iran as a medicinal plant for infants, as an antispasmodic, carminative or sedative:
Phytochemistry of Artemisia annua.
Sharma G, Shankar V, Agrawal V (2011)
An efficient micropropagation protocol of an elite clone EC-353508
of Artemisia annua L., an important antimalarial plant.
Int. J Pharma and Bio Sci 2(4):205–214
The Artemisia annua decoction has also been used as an antihemorrhagic to treat diarrhoea:
Mirdeilami SZ, Barani H, Mazandarani M, Heshmati GA (2011).
Ethnopharmacological survey of medicinal plant
in maraveh tappeh region, north of Iran.
Iranian J Plant Physiol 2:1.
The effects of Artemisia annua on hemostasis are also well known in traditional Persian medicine:
Wang B, Sui J, Yu Z, Zhu L (2011)
Screening the hemostatic active fraction of Artemisia annua L. In-vitro
Iranian J Pharmaceutic Res 10(1):57–62
The table below lists the medicinal uses of different parts of the Artemisia annua L. plant:
|Medicinal uses||Plant parts used|
|Nausea due to wet heat||Root|
|Malaria||Stem and leaves|
|Bronchitis and sore throat||Leaves|
|Lupus erythematosus||Whole plant|
|Athlete’s foot and eczema||Leaves|
|Viral hepatitis B||Leaves|
|Chills and fever||Whole plant|
|Parasitic disease including
schistosomiasis and leishmaniasis
Reference : Alia Sadiq, Muhammad Qasim Hayat and Muhammad Ashraf, « Ethnopharmacology of Artemisia annua L.: A Review », in Artemisia annua - Pharmacology and Biotechnology, p. 16, Tariq Aftab · Jorge F.S. Ferreira, M. Masroor A. Khan · M. Naeem Editors, Springer-Verlag Berlin Heidelberg 2014
Among the uses quoted in the above table, we can highlight the treatment of pathologies of infectious and parasitic origin: Chagas disease, Malaria, Schistosomiasis, Leishmaniasis, but also of viral origin: Bronchitis, Hepatitis B and Dengue.
Artemisia afra traditional uses
Artemisia afra is one of the oldest African medicinal plants recorded by ethnobotanical studies and remains one of the most renowned and used plants in South Africa. It also has medicinal uses throughout its natural range, which covers much of East Africa.
The list of its traditional uses covers a wide range of ailments.
N.Q. Liu et al. describe the traditional uses of the plant as follows:
Artemisia afra « is usually employed for treating a variety of ailments such as coughs, colds, headaches, chills, dyspepsia, loss of appetite, gastric derangement, colic, croup, whooping-cough, gout, asthma, malaria, diabetes, bladder and kidney disorders, influenza, convulsions, fever, heart inflammation, rheumatism and is also used as a purgative (Watt and Breyer-Brandwijk, 1932; Thring and Weitz, 2006).
These uses indicate that A. afra possesses antiviral, anti-bacterial and anti-inflammatory activities. Many different preparations of this plant are employed to treat the various symptoms and ailments. A syrup prepared from A. afra is used for bronchial troubles, while infusions or decoctions can be applied as a lotion to bathe hemorrhoids and for earache.
An infusion of leaves or roots of this species is also used for the treatment of diabetes in the Eastern Cape Province of South Africa (Erasto et al., 2005; Mahop and Mayet, 2007). Respiratory infections are treated through inhaling the vapor from boiling leaves and this vapor is also used to treat menstrual chill. Fresh tips are inserted into the nose for colds and headaches and into hollow teeth to treat toothache. The poultice of the leaves can be applied to relieve neuralgia, to treat the swellings in mumps and is placed on the abdomen to treat infantile colic.
It is also helpful to reduce colic by administering a tincture made of the leaves wetted by brandy (Watt and Breyer-Brandwijk, 1932). Artemisia afra is also used as an infusion. Usually, a quarter cup of fresh leaves is added to a cup of boiling water and the infusion is allowed to draw for 10 min. The mixture is then strained and the resulting infusion is sweetened with honey. This preparation is taken orally for relief of most of the above-mentioned ailments (Roberts, 1990).
The use of other medicinal plants or substances in combination with A. afra is also documented in African ethnopharmacology. In South Africa, preparations of A Afra are often made in combination with brandy, sugar, ginger, thyme, rosemary, mint, chamomile, Osmitopsis asteriscoides or Eucalyptus globulus. A combination of A. afra and E. globulus is employed to treat influenza, and the infusion of the leaves and stems of Lippia asperifolia and A. afra is used as a formula for fevers, influenza, measles, and as a prophylactic against lung inflammations (Watt and Breyer-Brandwijk, 1932).
Decoctions of the leaves of A. afra and Agrimonia bracteata are used for colds in southern Africa while decoctions of Tetradenia riparia and umhlonyane (Xhosa name for A. afra) with salt are used to treat coughs in the Transkei region of the Eastern Cape Province of South Africa (Hutchings et al., 1996).»
N.Q. Liu F. Van der Kooy R. Verpoorte
Artemisia afra: A potential flagship for African medicinal plants?
South African Journal of Botany 75 (2009) 185–195
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