1
|
Owor RO, Kawuma C, Nantale G, Kiyimba K, Obakiro SB, Ouma S, Lulenzi J, Gavamukulya Y, Chebijira M, Lukwago TW, Egor M, Musagala P, Andima M, Kibuule D, Waako P, Hokello J. Ethnobotanical survey and phytochemistry of medicinal plants used in the management of HIV/AIDS in Eastern Uganda. Heliyon 2024; 10:e31908. [PMID: 38845918 PMCID: PMC11153244 DOI: 10.1016/j.heliyon.2024.e31908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 05/22/2024] [Accepted: 05/23/2024] [Indexed: 06/09/2024] Open
Abstract
Currently, highly active antiretroviral therapy is unable to cure HIV/AIDS because of HIV latency. This study aimed at documenting medicinal plants used in the management of HIV/AIDS in Eastern Uganda so as to identify phytochemicals with HIV latency reversing potential. An ethnobotanical survey was conducted across eight districts in Eastern Uganda. Traditional medicine practitioners were interviewed using semi-structured questionnaires. Qualitative and quantitative phytochemical tests were respectively, performed to determine the presence and quantity of phytochemicals in frequently mentioned plant species. Data were analysed and presented using descriptive statistics and Informant Consensus Factor (ICF). Twenty-one plant species from fourteen plant families were reported to be used in the management of HIV/AIDS. Six plant species with the highest frequency of mention were: Zanthoxylum chalybeum, Gymnosporia senegalensis, Warbugia ugandensis, Leonatis nepetifolia, Croton macrostachyus and Rhoicissus tridentata. Qualitative phytochemical analysis of all the six most frequently mentioned plant species revealed the presence of flavonoids, tannins, terpenoids, alkaloids and phenolics. Quantitative analysis revealed the highest content of flavonoids in L. nepetifolia (20.4 mg/g of dry extract) while the lowest content was determined in C. macrostachyus (7.1 mg/g of dry extract). On the other hand, the highest content of tannins was observed in L. nepetifolia. (199.9 mg/g of dry extract) while the lowest content was found in R. tridentata. (42.6 mg/g of dry extract). Medicinal plants used by traditional medicine practitioners in Eastern Uganda to manage HIV/AIDS are rich in phytochemicals including flavonoids and tannins. Further studies to evaluate the HIV-1 latency reversing ability of these phytochemicals are recommended to discover novel molecules against HIV/AIDS.
Collapse
Affiliation(s)
- Richard Oriko Owor
- Department of Chemistry, Faculty of Science and Education, Busitema University, P.O Box 236, Tororo, Uganda
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
| | - Carol Kawuma
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Biology, Faculty of Science and Education, Busitema University, P.O. Box 236, Tororo, Uganda
| | - Gauden Nantale
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Biology, Faculty of Science and Education, Busitema University, P.O. Box 236, Tororo, Uganda
| | - Kenedy Kiyimba
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Pharmacology and Therapeutics, Faculty of Health Sciences, Busitema University, P.O. Box 1460, Mbale, Uganda
| | - Samuel Baker Obakiro
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Pharmacology and Therapeutics, Faculty of Health Sciences, Busitema University, P.O. Box 1460, Mbale, Uganda
| | - Simple Ouma
- The AIDS Support Organization (TASO), P.O Box 10443, Kampala, Uganda
| | - Jalia Lulenzi
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Paediatrics and Child Health, Faculty of Health Sciences, Busitema University, P.O. Box 1460, Mbale, Uganda
| | - Yahaya Gavamukulya
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Biochemistry and Molecular Biology, Faculty of Health Sciences, Busitema University P.O Box 1460, Mbale, Uganda
| | - Mercy Chebijira
- Department of Chemistry, Faculty of Science and Education, Busitema University, P.O Box 236, Tororo, Uganda
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
| | - Tonny Wotoyitide Lukwago
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Pharmacology and Therapeutics, Faculty of Health Sciences, Busitema University, P.O. Box 1460, Mbale, Uganda
| | - Moses Egor
- Department of Chemistry, Faculty of Science and Education, Busitema University, P.O Box 236, Tororo, Uganda
| | - Peter Musagala
- Department of Chemistry, Faculty of Science and Education, Busitema University, P.O Box 236, Tororo, Uganda
| | - Moses Andima
- Department of Chemistry, Faculty of Science and Education, Busitema University, P.O Box 236, Tororo, Uganda
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
| | - Dan Kibuule
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Pharmacology and Therapeutics, Faculty of Health Sciences, Busitema University, P.O. Box 1460, Mbale, Uganda
| | - Paul Waako
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Pharmacology and Therapeutics, Faculty of Health Sciences, Busitema University, P.O. Box 1460, Mbale, Uganda
| | - Joseph Hokello
- Busitema University Natural Products Research and Innovation Centre, P. O. Box 1460, Mbale, Uganda
- Department of Biology, Faculty of Science and Education, Busitema University, P.O. Box 236, Tororo, Uganda
| |
Collapse
|
2
|
Rakshit S, More A, Gaikwad S, Seniya C, Gade A, Muley VY, Mukherjee A, Kamble K. Role of diosgenin extracted from Helicteres isora L in suppression of HIV-1 replication: An in vitro preclinical study. Heliyon 2024; 10:e24350. [PMID: 38288021 PMCID: PMC10823083 DOI: 10.1016/j.heliyon.2024.e24350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 11/23/2023] [Accepted: 01/08/2024] [Indexed: 01/31/2024] Open
Abstract
Background Diosgenin, an essential sapogenin steroid with significant biological implications, is composed of a hydrophilic sugar moiety intricately linked to a hydrophobic steroid aglycone. While the antiviral properties of diosgenin against numerous RNA viruses have been extensively documented, its potential in combating Human Immunodeficiency Virus infections remains unexplored. Experimental procedure This current investigation presents a comprehensive and systematic analysis of extracts derived from the leaves of Helicteres isora, which are notably enriched with diosgenin. Rigorous methodologies, including established chromatographic techniques and Fourier-transform infrared spectroscopy were employed for the characterization of the active diosgenin compound followed by molecular interaction analyses with the key HIV enzymes and mechanistic validation of HIV inhibition. Key results The inhibitory effects of extracted diosgenin on the replication of HIV-1 were demonstrated using a permissive cellular system, encompassing two distinct subtypes of HIV-1 strains. Computational analyses involving molecular interactions highlighted the substantial occupancy of critical active site pocket residues within the key HIV-1 proteins by diosgenin. Additionally, the mechanistic underpinnings of diosgenin activity in conjunction with standard controls were elucidated through specialized colorimetric assays, evaluating its impact on HIV-1 Reverse Transcriptase and Integrase enzymes. Conclusions To our current state of knowledge, this study represents the inaugural demonstration of the anti-HIV efficacy inherent to diosgenin found in the leaves of Helicteres isora, and can be taken further for drug design and development for the management of HIV infection.
Collapse
Affiliation(s)
- Smita Rakshit
- Department of Microbiology, Sant Gadge Baba Amravati University, Amravati, MH, India
| | - Ashwini More
- Division of Virology, ICMR-National AIDS Research Institute, Pune, MH, India
| | - Shraddha Gaikwad
- Division of Virology, ICMR-National AIDS Research Institute, Pune, MH, India
| | - Chandrabhan Seniya
- VIT Bhopal University, School of Biosciences, Engineering and Technology, Bhopal, MP, India
| | - Aniket Gade
- Department of Biotechnology, Sant Gadge Baba Amravati University, Amravati, MH, India
- Department of Biological Science and Biotechnology, Institute of Chemical Technology, Mumbai, MH, India
| | | | - Anupam Mukherjee
- Division of Virology, ICMR-National AIDS Research Institute, Pune, MH, India
| | - Kapil Kamble
- Department of Microbiology, Sant Gadge Baba Amravati University, Amravati, MH, India
| |
Collapse
|
3
|
Kumatia EK, Zoiku FK, Asase A, Tung NH. In vitro and in silico anti-malarial activity and cytotoxicity of n-hexyl 1-O-rutinoside (a glycoside) isolated from Annickia polycarpa (DC.) Setten and Maas ex I.M. Turner (Annonaceae). JOURNAL OF ETHNOPHARMACOLOGY 2024; 319:117287. [PMID: 37827299 DOI: 10.1016/j.jep.2023.117287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/27/2023] [Accepted: 10/04/2023] [Indexed: 10/14/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Annickia polycarpa leaf is an effective anti-malarial agent. However, its chemical constituents have not been isolated and assayed against any pathogen. AIM OF THE STUDY To isolate and characterize anti-malarial compound(s) from the leaf of A. polycarpa. MATERIALS AND METHODS Bioassay-guided fractionation was employed to isolated the compound (AL1) from the chloroform fraction (ALCF) of the basified ethanol extract of A. polycarpa leaf (ALE). AL1 was characterized by LC-MS, 1D and 2D NMR spectroscopic analysis. Anti-malarial activity was evaluated against drug resistance Dd2 and drug sensitive 3D7 Plasmodium falciparum strains using the SYBR green assay. Cytotoxicity and mechanistic studies were determined using tetrazolium-based colorimetric assay and molecular docking respectively. RESULTS AL1 was characterized as n-hexyl 1-O-rutinoside. The IC50 values of ALE and ALCF against 3D7 and Dd2 P. falciparum strains ranges from 3.441 (0.3389) - 4.255 (0.2246) μg/mL. The IC50s obtained for n-hexyl 1-O-rutinoside and Artesunate (standard drug) were 7.71 (0.5473) and 0.001 (0.00008) nM against the 3D7 parasite strain respectively. Also, the efficacy of n-hexyl 1-O-rutinoside increased by 24.40% against the chloroquine resistance Dd2 P. falciparum strain whiles that of Artesunate decreased by 98.96%. Furthermore, ALE, ALCF and n-hexyl 1-O-rutinoside were weakly cytotoxic to human RBCs with high selectivity indices. N-hexyl 1-O-rutinoside inhibits P. falciparum chloroquine resistance transporter (PfCRT) and dihydrofolate reductase-thymidylate synthase (PfDHFR-TS) better than chloroquine and pyrimethamine respectively. But, produced similar inhibition of P. falciparum 2-trans-enoyl -ACP-reductase (PfERN) as triclosan. CONCLUSION These results show that A. polycarpa leaf and n-hexyl 1-O-rutinoside possessed profound anti-malarial activity and are not cytotoxic. N-hexyl 1-O-rutinoside could therefore, be developed into a new anti-malarial medicine. This is the first study to report the anti-malarial activity of n-hexyl 1-O-rutinoside and its isolation from the genus Annickia.
Collapse
Affiliation(s)
- Emmanuel Kofi Kumatia
- Department of Phytochemistry, Centre for Plant Medicine Research, Mampong-Akwapim, Ghana; Department of Quality Management, Centre for Plant Medicine Research, Mampong-Akwapim, Ghana.
| | - Felix Kwame Zoiku
- Depaertment of Epidemiology, Nouguchi Memorial Institute for Medical Research, University of Ghana, Accra, Ghana.
| | - Alex Asase
- Plant Development Department, Centre for Plant Medicine Research, Mampong-Akwapim, Ghana.
| | - Nguyen Huu Tung
- Faculty of Pharmacy, Phenikaa University, Hanoi 12116, Viet Nam.
| |
Collapse
|
4
|
Terefe EM, Okalebo FA, Derese S, Muriuki J, Mas-Claret E, Langat MK. Anti-HIV crotocascarin ω from Kenyan Croton dichogamus. Nat Prod Res 2023; 37:2809-2816. [PMID: 36278900 DOI: 10.1080/14786419.2022.2134998] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 10/05/2022] [Accepted: 10/06/2022] [Indexed: 10/31/2022]
Abstract
An anti-HIV methanol-soluble fraction of a 1:1 CH2Cl2:CH3OH extract of twigs of a Kenyan Croton dichogamus yielded seven compounds, the new crotocascarin ω (1), the known β-oplopanone (2), dihydroconiferyl acetate (3), 3'(4''-hydroxyphenyl)-propyl benzoate (4), lupeol, sitosterol and stigmasterol. Crotocascarin ω (90%) inhibited HIV-1 replication with an IC50 value of 5.3 nM, and the compound was cytotoxic towards MT-4 cells presenting an IC50 value of 84 µM. In silico modelling showed that the anti-HIV activity for compound 1 could be through the HIV-1 protease inhibition.
Collapse
Affiliation(s)
- Ermias Mergia Terefe
- Department of Pharmacology and Pharmacognosy, School of Pharmacy and Health Sciences, United States International University-Africa, Nairobi, Kenya
- Department of Pharmacology and Pharmacognosy, College of Health Sciences, University of Nairobi, Nairobi, Kenya
| | - Faith A Okalebo
- Department of Pharmacology and Pharmacognosy, College of Health Sciences, University of Nairobi, Nairobi, Kenya
| | - Solomon Derese
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - Joseph Muriuki
- Centre for Virus Research, Kenya Medical Research Institute, Nairobi, Kenya
| | | | | |
Collapse
|
5
|
Jadaun P, Shah P, Harshithkumar R, Said MS, Bhoite SP, Bokuri S, Ravindran S, Mishra N, Mukherjee A. Antiviral and ROS scavenging potential of Carica papaya Linn and Psidium guajava leaves extract against HIV-1 infection. BMC Complement Med Ther 2023; 23:82. [PMID: 36934258 PMCID: PMC10024014 DOI: 10.1186/s12906-023-03916-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 03/09/2023] [Indexed: 03/20/2023] Open
Abstract
Antiretroviral therapy is the only treatment option for HIV-infected patients; however, it has certain drawbacks in terms of developing multiple toxic side effects. Thus, there is a continuous need to explore safe and efficacious anti-retroviral agents. Carica papaya Linn and Psidium guajava are known for their various biological activities. In this study, we characterized the bioactive fractions of methanolic leaves extract from both plants using the High-resolution electrospray ionization mass spectrometry (HR-ESI-MS) technique, followed by the investigation of their potential as anti-HIV-1 and antioxidant agents through in vitro mechanistic assays. The anti-HIV-1 activity was examined in TZM-bl cells through luciferase gene assay against two different clades of HIV-1 strains, whereas the intracellular ROS generation was analyzed by Fluorescence-Activated Cell Sorting. Additionally, the mechanisms of action of these phyto-extracts were determined through the Time-of-addition assay. The characterization of Carica papaya Linn and Psidium guajava leaves extract through HR-ESI-MS fragmentation showed high enrichment of various alkaloids, glycosides, lipids, phenolic compounds, terpenes, and fatty acids like bioactive constituents. Both the phyto-extracts were found to be less toxic and exhibited potent antiviral activity against HIV-1 strains. Furthermore, the phyto-extracts also showed a decreased intracellular ROS in HIV-1 infected cells due to their high antioxidant potential. Overall, our study suggests the anti-HIV-1 potential of Carica papaya Linn and Psidium guajava leaves extract due to the synergistic action of multiple bioactive constituents.
Collapse
Affiliation(s)
| | - Prachibahen Shah
- Symbiosis School of Biological Sciences, Symbiosis International Deemed University, Pune, 412115, MH, India
| | - R Harshithkumar
- ICMR-National AIDS Research Institute, Pune, 411026, MH, India
| | | | | | - Sowmya Bokuri
- Symbiosis School of Biological Sciences, Symbiosis International Deemed University, Pune, 412115, MH, India
| | - Selvan Ravindran
- Symbiosis School of Biological Sciences, Symbiosis International Deemed University, Pune, 412115, MH, India
| | - Neetu Mishra
- Symbiosis School of Biological Sciences, Symbiosis International Deemed University, Pune, 412115, MH, India
| | | |
Collapse
|
6
|
Velázquez-Jiménez R, González-Montiel S, Sánchez-Ortega I, Villagómez-Ibarra JR, Acevedo-Sandoval OA. ADMET prediction, Docking, DM analysis and antibacterial screening of epoxy furan-clerodanes from Croton hypoleucus. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
7
|
In vitro anti-HIV and cytotoxic effects of pure compounds isolated from Croton macrostachyus Hochst. Ex Delile. BMC Complement Med Ther 2022; 22:159. [PMID: 35705943 PMCID: PMC9202147 DOI: 10.1186/s12906-022-03638-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 06/02/2022] [Indexed: 11/18/2022] Open
Abstract
Croton macrostachyus is an important plant in traditional African medicine, widely utilized to treat a variety of diseases. In Kenya, HIV-infected patients use leaf and root decoctions of the plant as a cure for cough, back pain, bleeding, skin diseases, warts, pneumonia, and wounds. This study aimed to evaluate the anti-HIV activities and cytotoxic effects of extracts and chemical constituents isolated from C. macrostachyus. In our previous study we demonstrated that the hexane, CH2Cl2, ethyl acetate and methanol soluble fractions of a 1:1 v/v/ CH2Cl2/MeOH crude extracts of the leaves and stem bark of C. macrostachyus exhibited potent anti-HIV activities against HIV-1 with IC50 values ranging from 0.02–8.1 μg/mL and cytotoxicity effects against MT-4 cells ranging from IC50 = 0.58–174 μg/mL. Hence, hexane soluble extract of 1:1 v/v/ CH2Cl2/MeOH crude extract of the leaves of C. macrostachyus, that was more potent against HIV-1 at IC50 = 0.02 μg/mL was subjected to column chromatography leading to the isolation of 2-methoxy benzyl benzoate (1), lupenone (2), lupeol acetate (3), betulin (4), lupeol (5), sitosterol (6) and stigmasterol (7). Lupenone (2), lupeol acetate (3) and betulin (4) exhibited anti-HIV-1 inhibition at IC50 = 4.7 nM, 4.3 and 4.5 μg/mL respectively. The results obtained from this study support the potential of C. macrostachyus, as a source of anti-HIV constituents.
Collapse
|
8
|
Terefe EM, Okalebo FA, Derese S, Muriuki J, Rotich W, Mas-Claret E, Sadgrove N, Padilla-González GF, Prescott TAK, Siddique H, Langat MK. Constituents of Croton megalocarpus with Potential Anti-HIV Activity. JOURNAL OF NATURAL PRODUCTS 2022; 85:1861-1866. [PMID: 35709365 DOI: 10.1021/acs.jnatprod.1c01013] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Reported herein is an anti-HIV monochlorinated compound, 1β-acetoxy-3β-chloro-5α,6α-dihydroxycrotocascarin L (1), of the rare crotofolane diterpenoid class. Compound 1, a suspected artifact of extraction, along with the previously undescribed 11β-acetoxycrotocascarin L (2) and a known compound, crotocascarin K (3), were isolated from the bark of Croton megalocarpus, a Kenyan oil-producing seed crop. Compounds 1 and 3 inhibited HIV-1 replication with IC50 values of 28 and 5.5 nM, respectively. Furthermore, both compounds lacked cytotoxicity toward MT-4 cells and FM-55-M1 cells at concentrations of up to 50 μM. Compounds 1 and 3 were both found to inhibit HIV-1 protease.
Collapse
Affiliation(s)
- Ermias Mergia Terefe
- Department of Pharmacology and Pharmacognosy, School of Pharmacy and Health Sciences, United States International University-Africa, 14634-00800, Nairobi, Kenya
- Department of Pharmacology and Pharmacognosy, College of Health Sciences, University of Nairobi, 14634-00800, Nairobi, Kenya
| | - Faith A Okalebo
- Department of Pharmacology and Pharmacognosy, College of Health Sciences, University of Nairobi, 14634-00800, Nairobi, Kenya
| | - Solomon Derese
- Department of Chemistry, University of Nairobi, 30197-00100, Nairobi, Kenya
| | - Joseph Muriuki
- Centre for Virus Research, Kenya Medical Research Institute, 54628-00200, Nairobi, Kenya
| | - Winnie Rotich
- Sigowet-Soin Sub-County Hospital, Sondu-Kapsoit Road, Sigowet, Kericho County, 112-20200, Kericho, Kenya
| | - Eduard Mas-Claret
- Royal Botanic Gardens, Kew, Kew Green, Richmond, Surrey, TW9 3AE, U.K
| | - Nicholas Sadgrove
- Royal Botanic Gardens, Kew, Kew Green, Richmond, Surrey, TW9 3AE, U.K
| | | | | | - Holly Siddique
- Royal Botanic Gardens, Kew, Kew Green, Richmond, Surrey, TW9 3AE, U.K
| | - Moses K Langat
- Royal Botanic Gardens, Kew, Kew Green, Richmond, Surrey, TW9 3AE, U.K
| |
Collapse
|
9
|
Terefe EM, Okalebo FA, Derese S, Batiha GES, Youssef A, Alorabi M, Muriuki J. Cytotoxicity and anti-HIV activities of extracts of the twigs of Croton dichogamus Pax. BMC Complement Med Ther 2022; 22:49. [PMID: 35216601 PMCID: PMC8876114 DOI: 10.1186/s12906-022-03532-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 02/15/2022] [Indexed: 11/10/2022] Open
Abstract
Background Acquired immunodeficiency syndrome (AIDS) is a clinical syndrome resulting from infection with human immunodeficiency virus (HIV), which causes profound immunosuppression. Anti-HIV drugs that are currently available are chemically synthesized and are frequently limited by side effects, the emergence of drug resistance, affordability, and availability, with over 5 million people in the world lacking access to treatment. As a result, to discover new anti-HIV agents, we investigated the effects of Kenyan C. dichogamus extracts on the laboratory-adapted strain HIV-1IIIB in human T-lymphocytic MT-4 cells. Methods Four soluble fractions of 1:1 v/v CH2Cl2:MeOH extract of the twigs of C. dichogamus Pax were tested for their replication inhibition activity against the laboratory-adapted strain HIV-1IIIB in the human T-lymphocytic MT-4 cell line. The plant extracts were further evaluated for their cytotoxicity in MT-4 cells using the MTT assay. Results The cytotoxicity CC50 values of the methanol and methylene chloride soluble fractions of C. dichogamus were found to be between 19.58 ± 0.79 and 167 ± 0.8 µg/ml, respectively. The hexane, methylene chloride, and methanol soluble fractions of the 1:1 v/v CH2Cl2:MeOH extract of the twigs of C. dichogamus showed inhibition of the HIV-1IIIB laboratory-adapted strain in a virus-infected cell culture antiviral assay. The methanol soluble fraction of the 1:1 v/v CH2Cl2:MeOH extract of the twigs of C. dichogamus showed significant anti-HIV activity by inhibiting more than 90% of viral-induced cytopathic effects with an IC50 value of 0.06 ± 0.01 µg/ml, giving an SI of 318.5. Conclusion Based on our findings, the methanol soluble fraction of the 1:1 v/v CH2Cl2:MeOH extract of the twigs of C. dichogamus has shown potential efficacy in inhibiting viral replication and could be considered a promising candidate for further studies.
Collapse
Affiliation(s)
- Ermias Mergia Terefe
- Department of Pharmacology and Pharmacognosy, School of Pharmacy and Health Sciences, United States International University-Africa, Nairobi, Kenya.
| | - Faith Apolot Okalebo
- Department of Pharmacology and Pharmacognosy, College of Health Sciences, University of Nairobi, Nairobi, Kenya
| | - Solomon Derese
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, AlBeheira, Egypt
| | - Amal Youssef
- Department of Medical Pharmacology, Faculty of Medicine, Cairo University, Giza, Egypt
| | - Mohammed Alorabi
- Department of Biotechnology, College of Sciences, Taif University, Taif, Saudi Arabia
| | - Joseph Muriuki
- Centre for Virus Research, Kenya Medical Research Institute, Nairobi, Kenya
| |
Collapse
|