Endemic and indigenous plants from Mascarene Islands with antiviral propensities

2021 ◽  
Vol 22 ◽  
Author(s):  
Mahomoodally Fawzi ◽  
Jugreet Bibi Sharmeen ◽  
Haddad Juliano ◽  
El Kalamouni Chaker
Keyword(s):  
Medicinal Plants ◽  
Chikungunya Virus ◽  
Viral Infections ◽  
Antiviral Effect ◽  
Antiviral Drugs ◽  
Sources Of Information ◽  
Viral Inhibition ◽  
Indigenous Plants ◽  
Mascarene Islands ◽  
Methyl Butyrate

Background: Antiviral resistance and inefficiency of available antiviral drugs to effectively treat viral infections have prompted many researchers worldwide to explore medicinal plants and their isolated compounds as alternative antivirals. The rich flora from the Mascarene Islands has also been thoroughly studied for their wide therapeutic activities, including their antiviral properties. Objective: The aim of this paper is to highlight the antiviral propensities of Mascarene endemic and indigenous medicinal plants. Methodology: A review of the literature was conducted via major databases and other primary sources of information. The inhibitory concentration/effective dose causing 50% viral inhibition (IC50/ED50), cytotoxic concentration causing 50% reduction in cell viability (CC50), and selectivity index (SI) were reported, and mechanisms of antiviral action were also discussed. Results: Stillingia lineata was the most effective against chikungunya virus (SI: 10.9), and among its isolated compounds, 12-O-acetylphorbol-13(2″-methyl)- butyrate and 12-deoxyphorbol-13(2″-methyl)butyrate were the most potent and selective inhibitors of chikungunya virus replication (SI= 41 and >240, respectively). 12-O-acetylphorbol-13(2″-methyl)- butyrate, 12β-O-[nona-2Z,4E,6E-trienoyl]-4α-deoxyphorbol-13-butyrate, 12-deoxyphorbol-13(2″-methyl)butyrate, and 12-deoxyphorbol-13-[8′-oxohexadeca-2E,4E,6E-trienoate showed strong selective antiviral effect on human immunodeficiency virus-I (SI 36-899) and II (SI 33-2056). Obetia ficifolia and Erythroxylon laurifolium were most active against the herpes virus (SI: 16 and 18.5, respectively). Labourdonnaisia glauca showed potent anti-poliovirus activity (SI: 40), while Badula insularis Labourdonnaisia glauca and Myonima violacea were active against Rhinovirus (SI: 1.3-2.5). The most effective against the Zika virus were Aphloia theiformis and Psiloxylon mauritianum. Both anti-zika and anti-dengue virus activity were reported for Doratoxylon apetalum. Conclusion: Promising spectrum of antiviral properties notably against Zika, dengue, chikungunya, polio, rhino, herpes, and human immunodeficiency viruses were presented by the Mascarene plants suggesting them as viable candidates for the potential development of effective natural antiviral drugs.

Nucleosides and Nucleoside Analogues as Emerging Antiviral Drugs

2020 ◽  
Vol 17 ◽  
Author(s):  
Mohamed Ibrahim Elzagheid
Keyword(s):  
Significant Role ◽  
Mode Of Action ◽  
Crucial Role ◽  
Viral Infections ◽  
Antiviral Drugs ◽  
Review Article ◽  
Nucleoside Analogues ◽  
The Past ◽  
Nucleoside Drugs

: Nucleosides and their analogues have been in use for many years and have become essential for treating patients with viral infections. Many additional nucleoside drugs have been approved over the past decades. This strongly demonstrates how important these compounds are and the crucial role they play. Given that a significant amount of research and literature has been documented regarding nucleoside analogues, this review article mainly focuses the discussion on nucleosides and nucleoside analogous that have proven to play significant role or be emerging in the treatment of known viral infections. This covers the names, structures, applications, toxicity, and mode of action of relevant nucleoside analogues.

scholarly journals Immunological Aspects Related to Viral Infections in Severe Asthma and the Role of Omalizumab

Biomedicines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 348
Author(s):  
Francesco Menzella ◽  
Giulia Ghidoni ◽  
Carla Galeone ◽  
Silvia Capobelli ◽  
Chiara Scelfo ◽  
...  
Keyword(s):  
Innate Immunity ◽  
Severe Asthma ◽  
Viral Infections ◽  
Respiratory Infections ◽  
Antiviral Effect ◽  
Point Of View ◽  
Type I ◽  
Effector Cells ◽  
Viral Spread ◽  
Increased Risk

Viral respiratory infections are recognized risk factors for the loss of control of allergic asthma and the induction of exacerbations, both in adults and children. Severe asthma is more susceptible to virus-induced asthma exacerbations, especially in the presence of high IgE levels. In the course of immune responses to viruses, an initial activation of innate immunity typically occurs and the production of type I and III interferons is essential in the control of viral spread. However, the Th2 inflammatory environment still appears to be protective against viral infections in general and in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections as well. As for now, literature data, although extremely limited and preliminary, show that severe asthma patients treated with biologics don’t have an increased risk of SARS-CoV-2 infection or progression to severe forms compared to the non-asthmatic population. Omalizumab, an anti-IgE monoclonal antibody, exerts a profound cellular effect, which can stabilize the effector cells, and is becoming much more efficient from the point of view of innate immunity in contrasting respiratory viral infections. In addition to the antiviral effect, clinical efficacy and safety of this biological allow a great improvement in the management of asthma.

scholarly journals Antimalarial drugs—are they beneficial in rheumatic and viral diseases?—considerations in COVID-19 pandemic

2021 ◽  
Author(s):  
Bogna Grygiel-Górniak
Keyword(s):  
Connective Tissue ◽  
Viral Infections ◽  
Current Knowledge ◽  
Inflammatory Diseases ◽  
Antiviral Drugs ◽  
In Vivo Studies ◽  
Viral Diseases ◽  
Cardiac Complications

AbstractThe majority of the medical fraternity is continuously involved in finding new therapeutic schemes, including antimalarial medications (AMDs), which can be useful in combating the 2019-nCoV: coronavirus disease (COVID-19). For many decades, AMDs have been widely used in the treatment of malaria and various other anti-inflammatory diseases, particularly to treat autoimmune disorders of the connective tissue. The review comprises in vitro and in vivo studies, original studies, clinical trials, and consensus reports for the analysis, which were available in medical databases (e.g., PubMed). This manuscript summarizes the current knowledge about chloroquine (CQ)/hydroxychloroquine (HCQ) and shows the difference between their use, activity, recommendation, doses, and adverse effects on two groups of patients: those with rheumatic and viral diseases (including COVID-19). In the case of connective tissue disorders, AMDs are prescribed for a prolonged duration in small doses, and their effect is observed after few weeks, whereas in the case of viral infections, they are prescribed in larger doses for a short duration to achieve a quick saturation effect. In rheumatic diseases, AMDs are well tolerated, and their side effects are rare. However, in some viral diseases, the effect of AMDs is questionable or not so noticeable as suggested during the initial prognosis. They are mainly used as an additive therapy to antiviral drugs, but recent studies have shown that AMDs can diminish the efficacy of some antiviral drugs and may cause respiratory, kidney, liver, and cardiac complications.

scholarly journals Trends and strategies to combat viral infections: A review on FDA approved antiviral drugs

2021 ◽  
Vol 172 ◽  
pp. 524-541
Author(s):  
Dharma Rao Tompa ◽  
Aruldoss Immanuel ◽  
Srimari Srikanth ◽  
Saraboji Kadhirvel
Keyword(s):  
Viral Infections ◽  
Antiviral Drugs

Clinical use of Antiviral Drugs

1987 ◽  
Vol 21 (5) ◽  
pp. 399-405 ◽  
Author(s):  
Milap C. Nahata
Keyword(s):  
Influenza A ◽  
Viral Infections ◽  
Antiviral Agent ◽  
Antiviral Drugs ◽  
Investigational Drug ◽  
Virus Infections ◽  
Herpes Encephalitis ◽  
Herpes Simplex Viruses ◽  
Varicella Zoster ◽  
Syncytial Virus

Remarkable progress has been made in antiviral chemotherapy. Six approved antiviral drugs are now available for the treatment of various viral infections. Trifluridine, idoxuridine and vidarabine are all effective in patients with herpes keratitis; trifluridine is preferred due to its low toxicity. Acyclovir is the drug of choice in patients with infections due to herpes simplex viruses, including genital herpes, herpes encephalitis, and neonatal herpes, and infections due to varicella-zoster virus. Amantadine is the only drug currently available for prophylaxis and treatment of influenza A, but an investigational drug, rimantadine, appears to be equally effective and less toxic than amantadine. Ribavirin is the most recently approved antiviral agent for the treatment of respiratory syncytial virus infections. Numerous antiviral drugs are being studied in patients with acquired immunodeficiency syndrome. Although currently available drugs have improved our ability to manage a variety of viral illnesses, much needs to be learned about specific dosage guidelines based on the studies of pharmacokinetics, pharmacodynamics, potential adverse effects and viral resistance, and the role of combination therapy to optimize therapy.

scholarly journals The Interferon-Stimulated Gene IFITM3 Restricts Infection and Pathogenesis of Arthritogenic and Encephalitic Alphaviruses

2016 ◽  
Vol 90 (19) ◽  
pp. 8780-8794 ◽  
Author(s):  
Subhajit Poddar ◽  
Jennifer L. Hyde ◽  
Matthew J. Gorman ◽  
Michael Farzan ◽  
Michael S. Diamond
Keyword(s):  
Viral Infections ◽  
Transmembrane Protein ◽  
Flow Cytometric Analysis ◽  
Antiviral Effect ◽  
Host Cells ◽  
Type I ◽  
Targeted Gene Deletion ◽  
Multiple Organs ◽  
Viral Burden ◽  
Alphavirus Infection

ABSTRACTHost cells respond to viral infections by producing type I interferon (IFN), which induces the expression of hundreds of interferon-stimulated genes (ISGs). Although ISGs mediate a protective state against many pathogens, the antiviral functions of the majority of these genes have not been identified. IFITM3 is a small transmembrane ISG that restricts a broad range of viruses, including orthomyxoviruses, flaviviruses, filoviruses, and coronaviruses. Here, we show that alphavirus infection is increased inIfitm3−/−andIfitmlocus deletion (Ifitm-del) fibroblasts and, reciprocally, reduced in fibroblasts transcomplemented with Ifitm3. Mechanistic studies showed that Ifitm3 did not affect viral binding or entry but inhibited pH-dependent fusion. In a murine model of chikungunya virus arthritis,Ifitm3−/−mice sustained greater joint swelling in the ipsilateral ankle at days 3 and 7 postinfection, and this correlated with higher levels of proinflammatory cytokines and viral burden. Flow cytometric analysis suggested thatIfitm3−/−macrophages from the spleen were infected at greater levels than observed in wild-type (WT) mice, results that were supported by experiments withIfitm3−/−bone marrow-derived macrophages.Ifitm3−/−mice also were more susceptible than WT mice to lethal alphavirus infection with Venezuelan equine encephalitis virus, and this was associated with greater viral burden in multiple organs. Collectively, our data define an antiviral role for Ifitm3 in restricting infection of multiple alphaviruses.IMPORTANCEThe interferon-induced transmembrane protein 3 (IFITM3) inhibits infection of multiple families of viruses in cell culture. Compared to other viruses, much less is known about the antiviral effect of IFITM3 on alphaviruses. In this study, we characterized the antiviral activity of mouse Ifitm3 against arthritogenic and encephalitic alphaviruses using cells and animals with a targeted gene deletion ofIfitm3as well as deficient cells transcomplemented with Ifitm3. Based on extensive virological analysis, we demonstrate greater levels of alphavirus infection and disease pathogenesis when Ifitm3 expression is absent. Our data establish an inhibitory role for Ifitm3 in controlling infection of alphaviruses.

scholarly journals In Vitro Antimalarial Activity of Extracts of Some Indigenous Plant Species in Kebbi State

2020 ◽  
pp. 1-10
Author(s):  
Aisha Abdulrazak ◽  
Keyword(s):  
Medicinal Plants ◽  
Aqueous Extract ◽  
Antimalarial Activity ◽  
Antimicrobial Activities ◽  
Antiplasmodial Activity ◽  
Phytochemical Screening ◽  
Indigenous Plants ◽  
Traditional Use ◽  
Water As Solvent

The search for antimalarial compounds has been necessitated by the resistance of Plasmodium falciparum to almost all antimalarial drugs. The aim of this research was to determine in-vitro antimalarial activity of extracts of some indigenous plants species in Kebbi State. Plant extraction was carried-out by maceration using ethanol and water as solvent. The antiplasmodial activity of the extracts was evaluated against fresh clinical isolates of P. falciparum using WHO method of in-vitro micro test. Phytochemical screening was also carried out on the extract to deduce the active chemicals present in the plant extract. All plant extracts demonstrate dose dependent antimicrobial activities with IC50 Less than 50%. However highest growth inhibition of the P. falciparum was demonstrated by aqueous and ethanol extract of A. indica with IC50 7.4µg/ml and 8.6µg/ml respectively followed by ethanol and aqueous extract of C. occidentalis with IC50 15.3µg/ml and 18.0µg/ml respectively. Least antimalarial activity was demonstrated by aqueous extract of M. oleifera with IC50 33.5µg/ml while ethanolic extract of M. oleifera demonstrated IC50 of 20.50µg/ml. M. indica ethanolic and aqueous extract also demonstrated moderate antimalarial activity with IC50 18.8µg/ml and 24.5µg/ml. The phytochemical screening of medicinal plants showed the presence of tannins, saponins, alkaloids, flavonoid, phenol and cardiac glycosides in the extracts, which may be responsible for the antiplasmodial activity. This result justifies the traditional use of the plant in malaria treatment and further research is suggested to identify and characterize the active principles from the plants. Keywords: Antimalaria, Invitro, Medicinal Plants, Malaria, Kebbi

scholarly journals To study the role of guduchyadi kashaya on viral diseases.

2020 ◽  
Vol 8 (05) ◽  
Author(s):  
Akshay Vaidya
Keyword(s):  
Wound Healing ◽  
Side Effects ◽  
Medicinal Plants ◽  
Broad Spectrum ◽  
Viral Infections ◽  
Modern Science ◽  
Viral Diseases ◽  
Diverse Group ◽  
Herbal Extracts

Viral infections remain major “worldwide” cause of morbidity and mortality.  Herbal extracts or wholesome drugs have been in use for medicinal purposes since ancient time and are known for their antiviral properties and more tolerable side effects. Thus, naturally based pharmacotherapy is a proper alternative for treating viral diseases. Hence this article describes potential antiviral properties of medicinal plants against diverse group of viruses and suggests screening the potential of plants possessing broad spectrum anti-viral effects against viral diseases. Guduchyadi Kwath is a polyherb ayurvedic preparation useful in various diseases. It is useful in pitta vikar, shleshma vikar, Jwara, Chardi, Daha, Trushna, and Agnimandya1. According to modern science it showed anti-inflammatory, antioxidant, antibacterial, antiviral, antimalarial, hepatoprotective, wound healing and immune-modulatory action. The study is aim to the effect of “Guduchyadi kashaya” on viral diseases.

scholarly journals Investigation of the effects of six medicinal plants with antiviral effects against COVID-19

2021 ◽  
Author(s):  
Harun ALP ◽  
Hasan ASİL ◽  
Demet Duman
Keyword(s):  
Medicinal Plants ◽  
Nigella Sativa ◽  
Water Extract ◽  
Antiviral Effect ◽  
Vero Cells ◽  
Glycyrrhiza Glabra ◽  
Crocus Sativus ◽  
Medicinal And Aromatic Plants ◽  
The World

Abstract Today, the coronavirus epidemic, which caused the death of 79 million cases and 1743 thousand people in 218 countries around the world, continues to increase its impact all over the world. Researchers are still trying to develop an effective solution against covid-19, including vaccines and drugs. However, there are few studies that determine the effect of natural products obtained from plants on covid-19. Medicinal and aromatic plants have been used for therapeutic purposes since the existence of humanity. In this study, the effects of some important medicinal plants including Licorice (Glycyrrhiza glabra), Saffron (Crocus sativus L.), Nigella (Nigella sativa L.), Laurel (Lauris nobilis), Karabaş (Lavandula stoechas), and Zahter (Thymbra spicata L. var. Spicata) against Covid-19 were investigated in vitro conditions. The six plants were evaluated for cytotoxic effect on Vero cells and determining inhibition of viral replication in Vero-E6 cells at concentrations of broad-spectrum antiviral non-cytotoxic against Covid-19 in cell culture and an additional antiviral effect against Covid-19. According to the results, the five examined plants (Saffron, Nigella, Laurel, Karabaş, Zahter) were ineffective against Covid-19 in vitro conditions. Interisingly, the water extract obtained from the root of the licorice plant (Glycyrrhiza glabra) inhibited Covid-19 in vitro conditions in the 2nd dilution (1: 4) following the initial concentration in Vero-E6 cells.

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