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Ticona JC, Bilbao-Ramos P, Amesty Á, Flores N, Dea-Ayuela MA, Bazzocchi IL, Jiménez IA. Flavonoids from Piper Species as Promising Antiprotozoal Agents against Giardia intestinalis. Structure-Activity Relationship and Drug-Likeness Studies. Pharmaceuticals (Basel) 2022; 15:1386. [PMID: 36355559 PMCID: PMC9695682 DOI: 10.3390/ph15111386] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 12/05/2023] Open
Abstract
Diarrhea diseases caused by the intestinal protozoan parasite Giardia intestinalis are a major global health burden. Moreover, there is an ongoing need for novel anti-Giardia drugs due to drawbacks with currently available treatments. This paper reports on the isolation and structural elucidation of six new flavonoids (1-6), along with twenty-three known ones (7-29) from the Piper species. Their structures were established by spectroscopic and spectrometric techniques. Flavonoids were tested for in vitro antiprotozoal activity against Giardia intestinalis trophozoites. In addition, structure-activity relationship (SAR) and in silico ADME studies were performed to understand the pharmacophore and pharmacokinetic properties of these natural compounds. Eight flavonoids from this series exhibited remarkable activity in the micromolar range. Moreover, compound 4 was identified as having a 40-fold greater antiparasitic effect (IC50 61.0 nM) than the clinical reference drug, metronidazole (IC50 2.5 µM). This antiprotozoal potency was coupled with an excellent selectivity index (SI 233) on murine macrophages and in silico drug-likeness. SAR studies revealed that the substitution patterns, type of functional group, and flavonoid skeleton played an essential role in the activity. These findings highlight flavonoid 4 as a promising candidate to develop new drugs for the treatment of Giardia infections.
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Affiliation(s)
- Juan C. Ticona
- Instituto Universitario de Bio-Orgánica Antonio González, Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
- Instituto de Investigaciones Fármaco Bioquímicas, Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés, Avenida Saavedra 2224, Miraflores, La Paz, Bolivia
| | - Pablo Bilbao-Ramos
- Departamento de Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
| | - Ángel Amesty
- Instituto Universitario de Bio-Orgánica Antonio González, Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
| | - Ninoska Flores
- Instituto de Investigaciones Fármaco Bioquímicas, Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés, Avenida Saavedra 2224, Miraflores, La Paz, Bolivia
| | - M. Auxiliadora Dea-Ayuela
- Departamento de Parasitología, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain
- Departamento de Farmacia, Bioquímica y Biología Molecular, Universidad CEU-Cardenal Herrera, Avda. Seminario s/n, 46113 Moncada, Valencia, Spain
| | - Isabel L. Bazzocchi
- Instituto Universitario de Bio-Orgánica Antonio González, Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
| | - Ignacio A. Jiménez
- Instituto Universitario de Bio-Orgánica Antonio González, Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
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Gonzalez-Ramirez M, Limachi I, Manner S, Ticona JC, Salamanca E, Gimenez A, Sterner O. Trichilones A-E: New Limonoids from Trichilia adolfi. Molecules 2021; 26:3070. [PMID: 34063814 PMCID: PMC8196563 DOI: 10.3390/molecules26113070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 05/13/2021] [Accepted: 05/19/2021] [Indexed: 11/17/2022] Open
Abstract
In addition to the trichilianones A-D recently reported from Trichilia adolfi, a continuing investigation of the chemical constituents of the ethanol extract of the bark of this medicinal plant yielded the five new limonoids 1-5. They are characterized by having four fused rings and are new examples of prieurianin-type limonoids, having a ε-lactone which in 4 and 5 is α, β- unsaturated. The structures of the isolated metabolites were determined by high field NMR spectroscopy and HR mass spectrometry. The new metabolites were shown to have the ε-lactone fused with a tetrahydrofuran ring which is connected to an oxidized hexane ring joined with a cyclo-pentanone having a 3-furanyl substituent. As the crude extract possesses antileishmanial activity, the compounds were assayed for cytotoxic and antiparasitic activities in vitro in murine macrophage cells (raw 264.7 cells) and in Leishmania amazoniensis as well as L. braziliensis promastigotes. Metabolites 1-3 and 5 showed moderate cytotoxicity (between 30-94 µg/mL) but are not responsible for the antileishmanial effect of the extract.
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Affiliation(s)
- Mariela Gonzalez-Ramirez
- Department of Chemistry, Centre for Analysis and Synthesis, Lund University, 22100 Lund, Sweden; (M.G.-R.); (I.L.); (S.M.)
| | - Ivan Limachi
- Department of Chemistry, Centre for Analysis and Synthesis, Lund University, 22100 Lund, Sweden; (M.G.-R.); (I.L.); (S.M.)
- Instituto de Investigaciones Farmaco Bioquimicas, Universidad Mayor de San Andres, La Paz, Bolivia; (J.C.T.); (E.S.); (A.G.)
| | - Sophie Manner
- Department of Chemistry, Centre for Analysis and Synthesis, Lund University, 22100 Lund, Sweden; (M.G.-R.); (I.L.); (S.M.)
| | - Juan C. Ticona
- Instituto de Investigaciones Farmaco Bioquimicas, Universidad Mayor de San Andres, La Paz, Bolivia; (J.C.T.); (E.S.); (A.G.)
| | - Efrain Salamanca
- Instituto de Investigaciones Farmaco Bioquimicas, Universidad Mayor de San Andres, La Paz, Bolivia; (J.C.T.); (E.S.); (A.G.)
| | - Alberto Gimenez
- Instituto de Investigaciones Farmaco Bioquimicas, Universidad Mayor de San Andres, La Paz, Bolivia; (J.C.T.); (E.S.); (A.G.)
| | - Olov Sterner
- Department of Chemistry, Centre for Analysis and Synthesis, Lund University, 22100 Lund, Sweden; (M.G.-R.); (I.L.); (S.M.)
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Flores N, Ticona JC, Bilbao-Ramos P, Dea-Ayuela MA, Ruiz Macedo JC, Bazzocchi IL, Bolás-Fernández F, Jiménez IA. An unprecedented chlorine-containing piperamide from Piper pseudoarboreum as potential leishmanicidal agent. Fitoterapia 2019; 134:340-345. [DOI: 10.1016/j.fitote.2019.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 11/30/2022]
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Limachi I, Condo C, Palma C, Nina N, Salamanca E, Ticona JC, Udaeta E, Flores N, Serato A, Marupa N, Chao B, Ibaguari G, Nay C, Manner S, Sterner O, Giménez A. Antiparasitic Metabolites from Hyptis brevipes, a Tacana Medicinal Plant. Nat Prod Commun 2019. [DOI: 10.1177/1934578x1901400115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A bioassay screening against protozoa parasites of several Tacana medicinal plants gave Hyptis brevipes (Id'ene eidhue), traditionally used as decoction for intestinal parasites, as the most active extract. In this work we did a bioguided isolation of active constituents found in leaves. Structure elucidation was carried out by NMR spectroscopy and MS spectrometry analyses. Active constituents showed differentiated activity towards Giardia lamblia, Trypanosoma cruzi, several Leishmania strains, Plasmodium falciparum and cytotoxicity against HeLa cells. Brevipolide H (1) was the less cytotoxic and best antiparasitic, while the catechol derivative (2) the most active and cytotoxic.
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Affiliation(s)
- Ivan Limachi
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
- Center for Analysis and Synthesis, Lund University, Naturvetarvägen 14, SE-22100 Lund, Sweden
| | - Claudia Condo
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | - Camila Palma
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | - Nelida Nina
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | - Efrain Salamanca
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | - Juan C. Ticona
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | - Enrique Udaeta
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | - Ninoska Flores
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
| | | | | | - Benigno Chao
- Buena Vista Community, Prov. Abel Iturralde, Bolivia
| | - Gladys Ibaguari
- Consejo Indígena de Mujeres Tacana (CIMTA), Tumupasa, Prov. Abel Iturralde, Bolivia
| | - Constantino Nay
- Consejo Indígena de los Pueblos Tacana (CIPTA), Tumupasa, Prov. Abel Iturralde, Bolivia
| | - Soffie Manner
- Center for Analysis and Synthesis, Lund University, Naturvetarvägen 14, SE-22100 Lund, Sweden
| | - Olov Sterner
- Center for Analysis and Synthesis, Lund University, Naturvetarvägen 14, SE-22100 Lund, Sweden
| | - Alberto Giménez
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, Av. Saavedra 2224, Mirafllores, La Paz, Bolivia
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Arévalo-Lopéz D, Nina N, Ticona JC, Limachi I, Salamanca E, Udaeta E, Paredes C, Espinoza B, Serato A, Garnica D, Limachi A, Coaquira D, Salazar S, Flores N, Sterner O, Giménez A. Leishmanicidal and cytotoxic activity from plants used in Tacana traditional medicine (Bolivia). J Ethnopharmacol 2018; 216:120-133. [PMID: 29391199 DOI: 10.1016/j.jep.2018.01.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Revised: 01/15/2018] [Accepted: 01/19/2018] [Indexed: 05/27/2023]
Abstract
ETNOPHARMACOLOGICAL RELEVANCE Thirty-eight Tacana medicinal plant species used to treat skin problems, including leishmania ulcers, skin infections, inflammation and wound healing, were collected in the community of Buena Vista, Bolivia, with the Tacana people. Twenty two species are documented for the first time as medicinal plants for this ethnic group living in the northern area of the Department of La Paz. AIM OF THE STUDY To evaluate the leishmanicidal effect (IC50) and cytotoxicity (LD50) of the selected plants. To carry out bioguided studies on the active extracts. To assess the potential of Bolivian plant biodiversity associated with traditional knowledge in the discovery of alternative sources to fight leishmaniasis. MATERIALS AND METHODS Seventy three ethanol extracts were prepared from 38 species by maceration and were evaluated in vitro against promastigotes of Leishmania amazonensis and L. braziliensis. Active extracts (IC50 ≤ 50 μg/mL) were fractionated by chromatography on Silica gel column and the fractions were assessed against the two Leishmania strains. The most active fractions and the crude extracts were evaluated against reference strains of L. amazonensis, L. braziliensis, L. aethiopica, two native strains (L. Lainsoni and L. braziliensis) and for cytotoxicity against HeLa cells. The chromatographic profile of the active fractions was obtained by reverse phase chromatography using HPLC. RESULTS From the 73 extracts, 39 extracts (53.4%) were inactive and 34 showed activity. Thirteen species were sselected for bioguided studies. The crude extracts and their 36 fractions were evaluated against two Leishmania strains. The most active fraction were tested in a panel of five leishmania strains and for cytotoxicity. The Selective Index (SI = LD50/IC50) was calculated, and were generally low. Retention time and UV spectra were recorded for the active fractions by HPLC-DAD using a reverse phase column. Profiles were very different from each other, showing the presence of different compounds. CONCLUSION Bolivian traditional knowledge from the Tacanba was useful to identify plants with effect on Leishmania promastigotes. Chromatographic bioguided studies showed stronger leishmanicidal and cytotoxic activity for the medium polar fraction. HPLC analysis showed different chromatographic profiles of the active fractions.
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Affiliation(s)
- Diandra Arévalo-Lopéz
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Nélida Nina
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Juan C Ticona
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Ivan Limachi
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia; Center for Analysis and Synthesis, Department of Chemistry, Lund University, Sweden
| | - Efrain Salamanca
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Enrique Udaeta
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Crispin Paredes
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Boris Espinoza
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Alcides Serato
- Consejo Indigena de Pueblos Tacana (CIPTA), Tumupasa, Provincia Abel Iturralde, Department of La Paz, Bolivia
| | - David Garnica
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Abigail Limachi
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Dayana Coaquira
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Sarah Salazar
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Ninoska Flores
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia
| | - Olov Sterner
- Center for Analysis and Synthesis, Department of Chemistry, Lund University, Sweden
| | - Alberto Giménez
- Instituto de Investigaciones Fármaco-Bioquímicas (IIFB), Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés (UMSA), Av. Saavedra No 2224, Miraflores, La Paz, Bolivia.
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Martín-Rodríguez AJ, Ticona JC, Jiménez IA, Flores N, Fernández JJ, Bazzocchi IL. Flavonoids from Piper delineatum modulate quorum-sensing-regulated phenotypes in Vibrio harveyi. Phytochemistry 2015; 117:98-106. [PMID: 26070141 DOI: 10.1016/j.phytochem.2015.06.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Revised: 05/28/2015] [Accepted: 06/02/2015] [Indexed: 06/04/2023]
Abstract
Quorum sensing (QS), or bacterial cell-to-cell communication, is a key process for bacterial colonization of substrata through biofilm formation, infections, and production of virulence factors. In an ongoing investigation of bioactive secondary metabolites from Piper species, four new flavonoids (1-4), along with five known ones (5-9) were isolated from the leaves of Piper delineatum. Their stereostructures were established by spectroscopic and spectrometric methods, including 1D and 2D NMR experiments, and comparison with data reported in the literature. The compounds were screened for their ability to interfere with QS signaling in the bacterial model Vibrio harveyi. Four compounds from this series (2, 3, 6, and 7) exhibited remarkable activity in the micromolar range, being compounds 3 and 7 particularly attractive since they did not affect bacterial growth. The results suggest that these flavonoids disrupt QS-mediated bioluminescence by interaction with elements downstream LuxO in the QS circuit of V. harveyi, and also, they exhibited a strong dose-dependent inhibition of biofilm formation. The present findings shed light on the QS inhibition mechanisms of flavonoids, underlining their potential applications.
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Affiliation(s)
- Alberto J Martín-Rodríguez
- Instituto Universitario de Bio-Orgánica Antonio González and Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain; Plataforma Oceánica de Canarias (PLOCAN), Carretera de Taliarte s/n, 35214 Telde, Gran Canaria, Spain
| | - Juan C Ticona
- Instituto de Investigaciones Fármaco Bioquímicas, Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés, Avenida. Saavedra 2224, Miraflores, La Paz, Bolivia
| | - Ignacio A Jiménez
- Instituto Universitario de Bio-Orgánica Antonio González and Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
| | - Ninoska Flores
- Instituto de Investigaciones Fármaco Bioquímicas, Facultad de Ciencias Farmacéuticas y Bioquímicas, Universidad Mayor de San Andrés, Avenida. Saavedra 2224, Miraflores, La Paz, Bolivia
| | - José J Fernández
- Instituto Universitario de Bio-Orgánica Antonio González and Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain.
| | - Isabel L Bazzocchi
- Instituto Universitario de Bio-Orgánica Antonio González and Departamento de Química Orgánica, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain.
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Campos-Buzzi F, Fracasso M, Clasen BK, Ticona JC, Gimenez A, Cechinel-Filho V. Evaluation of antinociceptive effects of Galipea longiflora alkaloid extract and major alkaloid 2-phenylquinoline. ACTA ACUST UNITED AC 2011; 32:707-11. [PMID: 21225005 DOI: 10.1358/mf.2010.32.10.1516692] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The present study evaluated the antinociceptive properties of an alkaloid extract and 2-phenylquinoline obtained from the bark of Galipea longiflora Krause (Rutaceae) against different models of pain in mice. The results demonstrate that the alkaloid extract caused a pronounced antinociceptive effect with the main alkaloid detected, 2-phenylquinoline, exhibiting moderate activity. The alkaloid extract had a calculated ID50 value of 20.3 mg/kg i.p. and less than 50 mg/kg p.o. against the writhing test which proved to be more effective than the reference drugs when administered by both routes. The ID50 of 2-phenylquinoline was 52.8 mg/kg i.p. with an inhibition of 24.5% when administered orally at 100 mg/kg. In the formalin test the alkaloid extract, but not 2-phenylquinoline, significantly inhibited both phases of pain (neurogenic and inflammatory) at 10 mg/kg i.p. with inhibitions of 37.4% and 58.3%, respectively. The alkaloid extract and 2-phenylquinoline caused only a modest effect in the capsaicin and glutamate tests. In the hot plate test, the alkaloid extract increased the latency time by 25.6% at 10 mg/kg i.p. compared to 2-phenylquinoline which was less effective. It appears that the antinociceptive effects of this plant may be attributed, at least in part, to the presence of some antinociceptive alkaloids in minor concentrations.
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Affiliation(s)
- F Campos-Buzzi
- Programa de Mestrado em Ciências Farmacêuticas e Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí - UNIVALI, Itajaí, Santa Catarina, Brazil
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