1
|
Identification and genetic characterization of a new totivirus from Bursera graveolens in western Ecuador. Arch Virol 2023; 168:102. [PMID: 36877420 DOI: 10.1007/s00705-023-05715-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Accepted: 01/09/2023] [Indexed: 03/07/2023]
Abstract
The complete genomic sequence of a previously uncharacterized virus provisionally named "Bursera graveolens associated totivirus 1" (BgTV-1) was obtained from Bursera graveolens (Kunth) Triana & Planch., a tree known as "palo santo" in Ecuador. The BgTV-1 genome is a monopartite double-stranded RNA (dsRNA) that is 4794 nucleotides (nt) long (GenBank accession number ON988291). Phylogenetic analysis of the capsid protein (CP) and RNA-dependent RNA polymerase (RdRp) placed BgTV-1 in a clade with other plant-associated totiviruses. Amino acid (aa) sequence comparisons of putative BgTV-1 proteins showed the highest sequence similarity to those of taro-associated totivirus L (QFS21890.1-QFS21891.1) and Panax notoginseng virus A (YP_009225664.1- YP_009225665.1), with 51.4% and 49.8% identity, respectively, in the CP and 56.4% and 55.2% identity, respectively, in the RdRp. BgTV-1 was not detected in total RNA from either of the two endophytic fungi cultured from BgTV-1-positive B. graveolens leaves, suggesting that BgTV-1 may be a plant-infecting totivirus. Based on its distinct host and the low aa sequence similarity between the CP of BgTV-1 and its counterparts from the closest relatives, the virus described in this study should be assigned as a new member of the genus Totivirus.
Collapse
|
2
|
Espinoza LC, Sosa L, Granda PC, Bozal N, Díaz-Garrido N, Chulca-Torres B, Calpena AC. Development of a Topical Amphotericin B and Bursera graveolens Essential Oil-Loaded Gel for the Treatment of Dermal Candidiasis. Pharmaceuticals (Basel) 2021; 14:ph14101033. [PMID: 34681257 PMCID: PMC8538170 DOI: 10.3390/ph14101033] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 09/30/2021] [Accepted: 10/04/2021] [Indexed: 01/02/2023] Open
Abstract
The higher molecular weight and low solubility of amphotericin B (AmB) hinders its topical administration. The aim of this study was to incorporate Bursera graveolens essential oil into an AmB topical gel (AmB + BGEO gel) in order to promote the diffusion of the drug through the skin in the treatment of cutaneous candidiasis. AmB + BGEO gel formulation was determined using a factorial experiment. Physical and chemical parameters, stability, in vitro release profile and ex vivo permeation in human skin were evaluated. In vitro antimicrobial activity was studied using strains of C. albicans, C. glabrata and C. parapsilosis. The tolerability was evaluated using in vitro and in vivo models. AmB + BGEO gel presented appropriate characteristics for topical administration, including pH of 5.85, pseudoplastic behavior, optimal extensibility, as well as high stability and acceptable tolerability. In vitro release studies showed that the formulation releases the drug following a Boltzmann sigmoidal model. Finally, AmB + BGEO gel exhibited higher amount of drug retained inside the skin and lower Minimum Inhibitory Concentration than a formulation sans essential oil. Therefore, these results suggest that the incorporation of B. graveolens essential oil in the formulation could be used as strategy to promote a local effect in the treatment of cutaneous candidiasis.
Collapse
Affiliation(s)
- Lupe Carolina Espinoza
- Departamento de Química, Universidad Técnica Particular de Loja, Loja 1101608, Ecuador; (L.C.E.); (B.C.-T.)
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028 Barcelona, Spain;
| | - Lilian Sosa
- Faculty of Chemical Sciences and Pharmacy, National Autonomous University of Honduras (UNAH), Tegucigalpa 11101, Honduras;
| | - Paulo C. Granda
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028 Barcelona, Spain;
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, 08028 Barcelona, Spain
| | - Nuria Bozal
- Department of Biology, Healthcare and the Environment, School of Pharmacy and Food Sciences, University of Barcelona, 08028 Barcelona, Spain;
| | - Natalia Díaz-Garrido
- Department of Biochemistry and Physiology, Faculty of Pharmacy and Food Sciences, University of Barcelona, 08028 Barcelona, Spain;
- Institute of Biomedicine of the University of Barcelona-Sant Joan de Déu Research Institute (IBUB-IRSJD), 08028 Barcelona, Spain
| | - Brenda Chulca-Torres
- Departamento de Química, Universidad Técnica Particular de Loja, Loja 1101608, Ecuador; (L.C.E.); (B.C.-T.)
| | - Ana Cristina Calpena
- Institute of Nanoscience and Nanotechnology (IN2UB), University of Barcelona, 08028 Barcelona, Spain;
- Department of Pharmacy, Pharmaceutical Technology and Physical Chemistry, Faculty of Pharmacy and Food Sciences, University of Barcelona, 08028 Barcelona, Spain
- Correspondence:
| |
Collapse
|
3
|
Abstract
Food is a precious commodity, and its production can be resource-intensive [...]
Collapse
|