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Froes TQ, Nicastro GG, de Oliveira Pereira T, de Oliveira Carneiro K, Alves Reis IM, Conceição RS, Branco A, Ifa DR, Baldini RL, Castilho MS. Calycopterin, a major flavonoid from Marcetia latifolia, modulates virulence-related traits in Pseudomonas aeruginosa. Microb Pathog 2020; 144:104142. [PMID: 32173496 DOI: 10.1016/j.micpath.2020.104142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 01/31/2020] [Accepted: 03/10/2020] [Indexed: 01/30/2023]
Abstract
Although bacterial resistance is a worldwide growing concern, the development of bacteriostatic and bactericidal drugs has been decreasing in the last decade. Compounds that modulate the microorganism virulence, without killing it, have been considered promising alternatives to combat bacterial infections. However, most signaling pathways that regulate virulence are complex and not completely understood. The rich chemical diversity of natural products offers a good starting point to identify key compounds that shed some light on this matter. Therefore, we investigated the role of Marcetia latifolia ethanolic extract, as well as its major constituent, calycopterin (5,4'-dihydroxy-3,6,7,8-tetramethoxylflavone), in the regulation of virulence-related phenotypes of Pseudomonas aeruginosa. Our results show that calycopterin inhibits pyocyanin production (EC50 = 32 μM), reduces motility and increases biofilm formation in a dose-dependent manner. Such biological profile suggests that calycopterin modulates targets that may act upstream the quorum sensing regulators and points to its utility as a chemical probe to further investigate P. aeruginosa transition from planktonic to sessile lifestyle.
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Affiliation(s)
- Thamires Quadros Froes
- Programa de Pós-graduação Em Biotecnologia, Universidade Estadual de Feira de Santana, Bahia, Brazil
| | | | | | - Kelli de Oliveira Carneiro
- Departmento de Saúde, Laboratorio de Fotoquímica, Universidade Estadual de Feira de Santana, Bahia, Brazil
| | - Isabella Mary Alves Reis
- Departmento de Saúde, Laboratorio de Fotoquímica, Universidade Estadual de Feira de Santana, Bahia, Brazil
| | - Rodrigo Souza Conceição
- Departmento de Saúde, Laboratorio de Fotoquímica, Universidade Estadual de Feira de Santana, Bahia, Brazil
| | - Alexsandro Branco
- Departmento de Saúde, Laboratorio de Fotoquímica, Universidade Estadual de Feira de Santana, Bahia, Brazil
| | - Demian Rocha Ifa
- Centre for Research in Mass Spectrometry, Department of Chemistry, York University, Toronto, ON, Canada
| | - Regina Lúcia Baldini
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Marcelo Santos Castilho
- Programa de Pós-graduação Em Biotecnologia, Universidade Estadual de Feira de Santana, Bahia, Brazil; Faculdade de Farmácia, Universidade Federal da Bahia, Bahia, Brazil.
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Lima HGD, Santos FO, Santos ACV, Silva GDD, Santos RJD, Carneiro KDO, Reis IMA, Estrela IDO, Freitas HFD, Bahiense TC, Pita SSDR, Uzeda RS, Branco A, Costa SL, Batatinha MJM, Botura MB. Anti-tick effect and cholinesterase inhibition caused by Prosopis juliflora alkaloids: in vitro and in silico studies. Rev Bras Parasitol Vet 2020; 29:e019819. [DOI: 10.1590/s1984-29612020036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 04/30/2020] [Indexed: 01/23/2023]
Abstract
Abstract We investigated the in vitro acaricide activity of the methanolic extract (ME) and alkaloid-rich fraction (AF) of Prosopis juliflora on Rhipicephalus microplus and correlated this effect with acetylcholinesterase (AChE) inhibition. The acaricide activity was evaluated using adult and larval immersion tests. Also, we studied the possible interaction mechanism of the major alkaloids present in this fraction via molecular docking at the active site of R. microplus AChE1 (RmAChE1). Higher reproductive inhibitory activity of the AF was recorded, with effective concentration (EC50) four times lower than that of the ME (31.6 versus 121 mg/mL). The AF caused mortality of tick larvae, with lethal concentration 50% (LC50) of 13.8 mg/mL. Both ME and AF were seen to have anticholinesterase activity on AChE of R. microplus larvae, while AF was more active with half-maximal inhibitory concentration (IC50) of 0.041 mg/mL. The LC-MS/MS analyses on the AF led to identification of three alkaloids: prosopine (1), juliprosinine (2) and juliprosopine (3). The molecular docking studies revealed that these alkaloids had interactions at the active site of the RmAChE1, mainly relating to hydrogen bonds and cation-pi interactions. We concluded that the alkaloids of P. juliflora showed acaricide activity on R. microplus and acted through an anticholinesterase mechanism.
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