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Do Carmo GM, Berto BP, Pereira FB, De Souza Lima S, De Araújo-Júnior HI, Pinheiro RM. Protozoan parasites of birds from the Tremembé formation (Oligocene of the Taubaté Basin), São Paulo, Brazil. Int J Paleopathol 2024; 45:46-54. [PMID: 38657471 DOI: 10.1016/j.ijpp.2024.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 04/02/2024] [Accepted: 04/08/2024] [Indexed: 04/26/2024]
Abstract
OBJECTIVE To analyze the presence of protozoan parasites in bird coprolites from the Tremembé Formation (Oligocene of the Taubaté Basin). MATERIALS Twenty avian coprolites embedded in pyrobituminous shale matrices. METHODS Samples were rehydrated and subjected to spontaneous sedimentation. RESULTS Paleoparasitological analyses revealed oocysts compatible with the Eimeriidae family (Apicomplexa) and one single Archamoebae (Amoebozoa) cyst. CONCLUSIONS The present work increases the amount of information about the spread of infections throughout the Cenozoic Era and reveals that the Brazilian paleoavifauna played an important role in the Apicomplexa and Amoebozoa life cycles. SIGNIFICANCE This is the first record of protozoans in avian coprolites from the Oligocene of Brazil. These findings can help in the interpretation of phylogenies of coccidian parasites of modern birds, as certain taxonomic characters observed in the Oligocene Protozoa characterize monophyletic groups in current molecular phylogenetic analyses. LIMITATIONS None of the oocysts were sporulated; therefore, it is not possible to identify the morphotypes to genus or species. SUGGESTIONS FOR FURTHER RESEARCH Our results create new perspectives related to biogeographic studies of the parasitic groups described and may improve the understanding of the temporal amplitude of parasitic evolutionary relationships between Protozoans and birds.
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Affiliation(s)
- Gustavo Macêdo Do Carmo
- Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Antônio Carlos Ave., Belo Horizonte 31270-901, Brazil.
| | - Bruno Pereira Berto
- Universidade Federal Rural do Rio de Janeiro, Instituto de Ciências Biológicas e da Saúde, Luiz Henrique Rezende Novaes Hwy, Seropédica 23897-000, Brazil
| | - Felipe Bisaggio Pereira
- Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Antônio Carlos Ave., Belo Horizonte 31270-901, Brazil
| | - Sueli De Souza Lima
- Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas., José Lourenço Kelmer Str, Juiz de Fora 36036-900, Brazil
| | | | - Ralph Maturano Pinheiro
- Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Antônio Carlos Ave., Belo Horizonte 31270-901, Brazil; Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas., José Lourenço Kelmer Str, Juiz de Fora 36036-900, Brazil
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Couto JV, Pontes AJ, Feitosa CV, Pereira FB, Paschoal F. Redescription of Hatschekia exigua Pearse, 1951 (Copepoda: Hatschekiidae), parasitic on the Squirrelfish Holocentrus adscensionis (Osbeck, 1765) (Actinopterygii: Holocentridae) off Ceará, Northeastern Brazil, with first description of the male. Syst Parasitol 2024; 101:27. [PMID: 38568382 DOI: 10.1007/s11230-024-10151-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 01/22/2024] [Indexed: 04/05/2024]
Abstract
The original description of Hatschekia exigua Pearse, 1951 neglected innumerous features of taxonomic value as well as morphometric data and illustrations. Posteriorly, other author tried to access the type material, but their poor state of preservation compromised a detailed redescription. Since then, this species is in need for new morphological data, mainly from fresh material. In the present work, three specimens of Holocentrus adscensionis from Mucuripe Bay, Fortaleza, State of Ceará, Northeastern Brazil, were parasitized by copepods on their gills. Parasites were fixed and preserved in 80% ethanol and cleared in 85% lactic acid for morphological observations using light microscopy. The females were identified as Hatschekia exigua by the cephalothorax representing about one-fourth of total body length, with lateral margins expanded into lateral lobes, first exopod with basal segment armed with one outer setae and terminal segment with three setae, first endopod with basal segment unarmed and terminal segment with five setae, leg 3 reduced to two setae and leg 4 reduced to single seta. Comparison with the type series revealed morphological differences in trunk and small appendages, which may be related to alterations in the specimens, caused by the mounting methodology and poor preservation. A detailed morphological analysis of the male revealed for the first time that they differ from their closest congeners by having five setae on the last endopodal segment of leg 1, by smooth intercoxal sclerites on legs 1 and 2 and by a proximolateral process on the third segment of antenna. Moreover, this work represents the first report of H. exigua in Brazil and the first hatschekiid copepod found off the coast of Ceará, highlighting that the diversity of Hatschekiidae in this oceanographic region still needs further investigation.
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Affiliation(s)
- João Victor Couto
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Anna Júlia Pontes
- Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro, Campus Zona Oeste, Av. Manuel Caldeira de Alvarenga, 1203, Campo Grande, Rio de Janeiro, RJ, 23070-200, Brazil
| | - Caroline Vieira Feitosa
- Instituto de Ciências do Mar - Labomar, Universidade Federal do Ceará, Avenida da Abolição, 3207, Fortaleza, CE, 60165-081, Brazil
| | - Felipe Bisaggio Pereira
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Fabiano Paschoal
- Programa de Pós-Graduação em Biodiversidade e Conservação, Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Av. dos Portugueses, 1966, Bacanga, São Luís, MA, 65080-805, Brazil.
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Vieira FM, Pereira FB, Ribeiro LB, Oliveira JB, Silva DCN, Muniz-Pereira LC, Felix-Nascimento G. Oswaldocruzia franciscoensis n. sp. (Nematoda: Molineidae) in Leptodactylus macrosternum Miranda-Ribeiro, 1926 (Anura: Leptodactylidae) from Caatinga morphoclimatic domain, Brazil: morphological and molecular characterisation. J Helminthol 2023; 97:e104. [PMID: 38148677 DOI: 10.1017/s0022149x23000858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
A new species of Oswaldocruzia Travassos, 1917 (Nematoda, Molineidae), parasite of Leptodactylus macrosternum Miranda-Ribeiro, 1926 (Anura: Leptodactylidae), from Caatinga morphoclimatic domain, Brazil, is described based on morphological and molecular data. Oswaldocruzia franciscoensis n. sp. is characterised by an anterior extremity with a cephalic vesicle divided into two portions, a body covered by cuticular longitudinal ridges, and cervical alae. Males of the new species have caudal bursa of type I with a 2-1-2 pattern, spicules divided into a shoe, bifurcated fork, and blade with two unequal branches, in which the longer branch bifurcates at its distal portion end and the smaller branch with three distal processes, each with distal bifurcations. Females have didelphic and amphidelphic uteri, an ovijector divided into vestibule, anterior and posterior sphincters, and anterior and posterior infundibula. The new species differs from its Neotropical congeners that have caudal bursa of type I, based on the presence of cervical alae and by having a spicular blade distally divided into two unequal branches, with the longer branch bifurcating at its distal portion and smaller branch with three distal processes, each distally bifurcated. The partial 18S rDNA sequence generated for Oswaldocruzia franciscoensis n. sp. is the first of a representative belonging to this genus in the Neotropical region.
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Affiliation(s)
- F M Vieira
- Campus de Ciências Agrárias, Universidade Federal do Vale do São Francisco (UNIVASF), Rodovia BR-407, KM 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, 56300-000, Brazil
| | - F B Pereira
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Bloco L4 sala 252, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG31270-901, Brazil
| | - L B Ribeiro
- Campus de Ciências Agrárias, Universidade Federal do Vale do São Francisco (UNIVASF), Rodovia BR-407, KM 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, 56300-000, Brazil
| | - J B Oliveira
- Laboratório de Parasitologia, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manoel de Medeiros s/nº, Recife CEP 52051-360, Brazil
| | - D C N Silva
- Campus de Ciências Agrárias, Universidade Federal do Vale do São Francisco (UNIVASF), Rodovia BR-407, KM 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, 56300-000, Brazil
| | - L C Muniz-Pereira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz, FIOCRUZ. Av. Brasil 4365, Rio de Janeiro CEP 21040-900, Brazil
| | - G Felix-Nascimento
- Campus de Ciências Agrárias, Universidade Federal do Vale do São Francisco (UNIVASF), Rodovia BR-407, KM 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, 56300-000, Brazil
- Laboratório de Anatomia dos Animais Domésticos e Silvestres (LAADS), Universidade Federal do Vale do São Francisco (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 s/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco56300-000, Brazil
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Couto JV, Nunes JLS, Rincon G, Paschoal F, Pereira FB. Ergasilus lyraephorus n. sp. (Copepoda: Cyclopoida: Ergasilidae) parasitic on the Longtail Knifefish Sternopygus macrurus (Bloch & Schneider, 1801) (Actinopterygii: Sternopygidae) from Northeast Brazil. Syst Parasitol 2023; 101:6. [PMID: 38114827 DOI: 10.1007/s11230-023-10133-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 10/06/2023] [Indexed: 12/21/2023]
Abstract
The cyclopoid family Ergasilidae Burmeister, 1835, is the most common group of parasitic copepods infesting fish in Brazil, and the type-genus Ergasilus von Nordmann, 1832 comprises the highest number of species. During a survey of freshwater fish in Northeast Brazil, a new species of Ergasilus was found on the gills of the Longtail Knifefish Sternopygus macrurus (Bloch & Schneider) (Actinopterygii: Sternopygidae) in the Viana lake system, State of Maranhão. Ergasilus lyraephorus n. sp. can be distinguished from its closest congeners mainly because it has a lyre-shaped ornamentation on the ventral surface of first pedigerous somite, a feature that has never been reported in the family. In addition, the new species differs from closely related congeners by having a maxillule bearing three elements, by the large spinules on the interpodal plates of legs 1, 2 and 3, and by having leg 5 reduced to a single seta of moderate size. The present study is the first report of an ergasilid parasitizing S. macrurus, as well as the first parasitic copepod found on a host belonging to the family Sternopygidae Cope.
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Affiliation(s)
- João Victor Couto
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Jorge Luiz Silva Nunes
- Laboratório de Organismos Aquáticos, Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Av. dos Portugueses, 1966, Bacanga, São Luís, MA, 65080-805, Brazil
| | - Getulio Rincon
- Centro de Ciências de Pinheiro, Universidade Federal do Maranhão, Campus Pinheiro, Estrada Pinheiro/Pácas Km 10, s/n Enseada, Pinheiro, MA, 65200-000, Brazil
| | - Fabiano Paschoal
- Programa de Pós-Graduação em Biodiversidade e Conservação, Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Av. dos Portugueses, 1966, Bacanga, São Luís, MA, 65080-805, Brazil
| | - Felipe Bisaggio Pereira
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Bloco L4 sala 252, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brasil.
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Paschoal F, Couto JV, Pereira FB, Luque JL. A new species of Colobomatus Hesse, 1873 (Copepoda: Philichthyidae) parasitic in the interorbital canals of the Caitipa mojarra Diapterus rhombeus (Cuvier, 1829) (Actinopterygii: Gerreidae) from Sepetiba Bay, southeastern Brazil. Syst Parasitol 2023; 100:111-120. [PMID: 36329377 DOI: 10.1007/s11230-022-10074-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 10/20/2022] [Indexed: 11/06/2022]
Abstract
A new species of parasitic copepod, Colobomatus deborae n. sp., belonging to the cyclopoid family Philichthyidae Vogt, 1877, is proposed based on adult female specimens collected from the interorbital canals of the Caitipa mojarra Diapterus rhombeus (Cuvier) (Gerreidae) from Sepetiba Bay, off the State of Rio de Janeiro, southeastern Brazil. The new species closely resembles six species of Colobomatus Hesse, 1873, but differs from these close congeners based on the combination of the following characters: lateral cephalic processes forked basally with sharp tips, midventral cephalic process representing about one third of the length of the laterals, thoracic processes forked and caudal rami with a pair of unequal processes. Together with the new species described in the present study, the philichthyid fauna of Brazil rises to 10 species reported from 14 Brazilian marine fish species. This is also the third report of Colobomatus in a gerreid fish, but the first species found parasitizing the genus Diapterus.
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Affiliation(s)
- Fabiano Paschoal
- Programa de Pós-Graduação em Biodiversidade e Conservação, Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Av. dos Portugueses, 1966, Bacanga, São Luís, MA, 65080-805, Brazil.
| | - João Victor Couto
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Felipe Bisaggio Pereira
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - José Luis Luque
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 23897-000, Brazil
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Couto JV, de Nazaré Pereira A, Luque JL, Paschoal F, Pereira FB. Two new species of Acusicola Cressey, 1970 (Copepoda:Cyclopoida: Ergasilidae) parasitic on the gills of two estuarine actinopterygians off Brazil. Syst Parasitol 2023; 100:133-148. [PMID: 36471195 PMCID: PMC9734582 DOI: 10.1007/s11230-022-10076-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 11/11/2022] [Indexed: 12/12/2022]
Abstract
Two new species of copepods assigned to the genus Acusicola Cressey, 1970 (Cyclopoida: Ergasilidae) are proposed based on post-metamorphic adult females, parasitizing the gills of two actinopterygian fish off Brazil namely, the Tripletail Lobotes surinamensis (Bloch) (Lobotidae), collected in the coastal zone of the State of Pará, near Curuçá Municipallity, and the Swordspine snook Centropomus ensiferus Poey (Centropomidae) collected in Sepetiba Bay, State of Rio de Janeiro, Brazil. Acusicola iamarinoi n. sp. parasite of L. surinamensis, differs from its closet congeners based on the first segment of the antennule armed with 10 setae, the presence of a maxillule armed with four elements and a pair of blunt processes dorsally on the fourth pedigerous somite. Acusicola pasternakae n. sp., collected from C. ensiferus, can be distinguished from its closest congeners based on the membranous sheath of the first endopodal segment of antenna with horizontal marks, the first segment of the antennule armed with 11 setae and a spine on the last exopodal segment of leg 2. This is the first report of representatives of Acusicola parasitizing fish of the families Lobotidae and Centropomidae as well as new geographical records of the genus in the coast of State of Pará and in Sepetiba Bay, Brazil.
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Affiliation(s)
- João Victor Couto
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Aldenice de Nazaré Pereira
- Instituto Federal do Pará, Campus Abaetetuba, Avenida Rio de Janeiro, 3322, Francilândia, Abaetetuba, PA, 68440-000, Brazil
| | - José Luis Luque
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 23897-000, Brazil
| | - Fabiano Paschoal
- Programa de Pós-Graduação em Biodiversidade e Conservação, Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Av. dos Portugueses, 1966, Bacanga, São Luís, MA, 65080-805, Brazil
| | - Felipe Bisaggio Pereira
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Bloco L4 sala 252, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil.
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Couto JV, Lessa FG, Luque JL, Pereira FB, Paschoal F. New host and first description of the male of Colobomatus stelliferi Pombo, Turra, Paschoal & Luque, 2015 (Copepoda: Philichthyidae), parasite of Umbrina canosai Berg, 1895 (Actinopterygii: Sciaenidae) off Brazil: improving the taxonomic knowledge pertaining to Colobomatus spp. Syst Parasitol 2023; 100:171-182. [PMID: 36495393 DOI: 10.1007/s11230-022-10079-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 11/22/2022] [Indexed: 12/14/2022]
Abstract
The present study provides new host and first description of the male of Colobomatus stelliferi Pombo, Turra, Paschoal & Luque, 2015 (Copepoda, Philichthyidae), collected from the mandibular canals of the Argentine croaker Umbrina canosai Berg, off the State of Rio de Janeiro, Brazil. Four out of nine fish analyzed (prevalence 44.4%) were parasitized by C. stelliferi and showed a mean intensity of 2.5 (range 2-3, standard deviation 1.25). Adult males of C. stelliferi can be differentiated from their closest congeners based on the combination of the following characters: maxilliped with naked basal segment and small apical spine, the presence of two elements on the second endopodal segment of the antenna, and the presence of leg 4. This parasitic copepod is seemingly host-specific to fish of the family Sciaenidae and its occurrence is restricted to the Brazilian coast. The present results contribute to our knowledge of the biology of C. stelliferi and of the parasitic copepod fauna from Brazil.
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Affiliation(s)
- João Victor Couto
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Fábio Guimarães Lessa
- Departamento de Biologia, Universidade do Estado do Rio de Janeiro, Campus Zona Oeste, Avenida Manuel Caldeira de Alvarenga, 1203, Campo Grande, Rio de Janeiro, RJ, 23070-200, Brazil
| | - José Luis Luque
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 23897-000, Brazil
| | - Felipe Bisaggio Pereira
- Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antonio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Fabiano Paschoal
- Programa de Pós-Graduação em Biodiversidade e Conservação, Departamento de Oceanografia e Limnologia, Universidade Federal do Maranhão, Av. dos Portugueses, 1966, Bacanga, São Luís, MA, 65080-805, Brazil.
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Miranda GS, Rodrigues JGM, Resende SD, Camelo GMA, Silva JKADO, Dos Santos JCR, Silva-Souza N, Pereira FB, Furtado LFV, Rabelo ÉML, Negrão-Corrêa D. From field to laboratory: isolation, genetic assessment, and parasitological behavior of Schistosoma mansoni obtained from naturally infected wild rodent Holochilus sciureus (Rodentia, Cricetidae), collected in Northeastern Brazil. Parasitol Res 2023; 122:395-411. [PMID: 36534238 DOI: 10.1007/s00436-022-07710-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 10/27/2022] [Indexed: 12/23/2022]
Abstract
Wild rodent species are naturally infected by Schistosoma mansoni; however, the genetic characterization of the parasite, its parasitological features, and its role in human schistosomiasis are poorly understood. In this study, we isolated and characterized Schistosoma from naturally infected Holochilus sciureus, called HS strain, collected from a schistosomiasis endemic region in Maranhão State, Brazil. To isolate the parasite, miracidia obtained from the livers of H. sciureus were used to infect Biomphalaria glabrata of sympatric (called SB) and allopatric (called BH) strains, and the produced cercariae were subcutaneously inoculated into hamsters and/or BALB/c mice. Parasitological kinetics in experimentally infected hosts were evaluated, and the tRNACys-12S (referred to as 16S herein) and cox 1 regions of mtDNA from isolated worms were amplified and sequenced. Only miracidia obtained from infected mice, but not from hamsters, were capable of infecting B. glabrata, allowing maintenance of the isolated parasite. Cox1 and 16S mtDNA sequences showed 100% similarity with S. mansoni, and phylogenetic analysis showed that the HS strain of S. mansoni forms an assemblage with isolates from America and Kenya, confirming the conspecificity. Experimental infection of B. glabrata SB with S. mansoni HS resulted in two peaks of cercariae shedding at 45 and 70 days post-infection (dpi) and caused higher mortality than in B. glabrata BH. The worm recovery rate in mice was approximately 13%, and the peak of egg elimination occurred at the 10th week post-infection. Therefore, S. mansoni obtained from H. sciureus was successfully isolated, genetically characterized, and maintained in mice, allowing further study of this schistosome strain.
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Affiliation(s)
- Guilherme Silva Miranda
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
- Department of Biology, Federal Institute of Education, Science and Technology of Maranhão, São Raimundo das Mangabeiras, Brazil
| | - João Gustavo Mendes Rodrigues
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
| | - Samira Diniz Resende
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
| | - Genil Mororó Araújo Camelo
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
| | | | - Jose Carlos Reis Dos Santos
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
| | - Nêuton Silva-Souza
- Department of Chemistry and Biology, State University of Maranhão, São Luís, Brazil
| | - Felipe Bisaggio Pereira
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
| | - Luis Fernando Viana Furtado
- Department of Clinical and Toxicological Analysis, Federal University of Minas Gerais, Av. Antonio Carlos 6627, Campus Pampulha, MG, Belo Horizonte, Brazil
| | - Élida Mara Leite Rabelo
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil
| | - Deborah Negrão-Corrêa
- Department of Parasitology, Federal University of Minas Gerais, Avenida Antônio Carlos 6627, Campus Pampulha, Belo Horizonte, MG, CEP: 31.270-010, Brazil.
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Frizzo A, Aguiari AG, Andrade SS, Pereira FB, Benites BD, Alves SCR. VALIDATION OF LONGER FRESH STORAGE TIME FOR PERIPHERAL BLOOD STEM CELLS INTENDED FOR CLINICAL USE. Hematol Transfus Cell Ther 2022. [DOI: 10.1016/j.htct.2022.09.510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Paschoal F, Couto JV, Pereira FB, Luque JL. A New Species of Hatschekiid Copepod (Crustacea: Hatschekiidae) Parasitic on the Porkfish Anisotremus virginicus (Linnaeus, 1758) (Actinopterygii: Haemulidae), with Notes on Previously Known Species of Hatschekia Poche, 1902 Collected from Actinopterygians off Brazil. Acta Parasitol 2022; 67:1126-1135. [PMID: 35476261 DOI: 10.1007/s11686-022-00551-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 04/04/2022] [Indexed: 11/01/2022]
Abstract
INTRODUCTION Copepods of the genus Hatschekia Poche, 1902 are parasitic on the gills of marine actinopterygians. Currently, about 151 species of this genus have been reported in marine ecosystems and only few occur in South Atlantic Ocean. METHODS Fifty specimens of A. virginicus from Angra dos Reis, off the State of Rio de Janeiro, Brazil, were parasitized by copepods on the gills. Parasites were fixed and preserved in 70% ethanol. Morphological observations were based on light and scanning electron microscopy. RESULTS Hatschekia nagasawai n. sp. can be distinguished from all congeners by the combination of the following characters: (1) presence of two pointed processes on the proximal (first) segment of antennule, (2) cephalothorax octagonal to ovoid, (3) absence of processes on the intercoxal sclerite of legs 1 and 2, (4) trunk without lobes at the postero-lateral margins. Other species of Hatschekia and their hosts previously collected off Brazil were analysed and discussed. CONCLUSIONS This is the first report of a representative of the family Hatschekiidae Kabata, 1979 parasitizing a species of Anisotremus. The number of species of Hatschekia reported in the South Atlantic Ocean was increased to five, including the new species; however, the diversity of hatschekiid copepods in this oceanographic region is still underestimated, most likely being higher than what is currently known.
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Alves PV, Couto JV, Pereira FB. Redescription of the two most recorded Physaloptera (Nematoda: Physalopteridae) parasitizing lizards in the Americas: first step towards a robust species identification framework. Syst Parasitol 2022; 99:63-81. [PMID: 35040088 DOI: 10.1007/s11230-021-10016-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 11/16/2021] [Indexed: 11/26/2022]
Abstract
Despite being the two most recorded species of Physaloptera from lizards in the Americas, P. retusa and P. lutzi are either incompletely described or have accumulated inaccurate morphological data through the years. Here, we redescribe both species from Tropidurus torquatus in the State of Minas Gerais, Brazil, including evaluation of specimens from the Coleção Helmintológica do Instituto Oswaldo Cruz. In P. retusa, the presence and location of amphids, presence and pattern of porous areas on pseudolabia, detailed pattern of cuticular ornamentations on ventral surface of the caudal bursa, structure of cloacal labia, presence of dome-shaped elevation between the last pair of postcloacal papillae and location of phasmids in males, were revealed for the first time. Additional morphometric data are also provided. In P. lutzi, the detailed morphological analysis revealed for the first time, porous areas on pseudolabia, as well as presence of amphids, phasmids, and the detailed ornamentation and papillae arrangement on the male bursa. Also, the presence of an internal tripartite and an external triangular labial tooth in the specimens were observed to be constant, diverging from the assertions by other authors. Finally, in P. lutzi was possible to observe that deirids are consistently located close to muscular oesophagus base with excretory pore slightly posterior to it, and the vulva is always close to anal aperture. The present observations confirmed the validity of P. lutzi and strengthened its taxonomic diagnosis. An up-to-date list of records of both species is provided, including a brief discussion on their host spectrum and geographic range.
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Affiliation(s)
- Philippe Vieira Alves
- Departamento de Parasitologia e Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - João Victor Couto
- Departamento de Parasitologia e Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos, Pampulha, Belo Horizonte, MG, 31270-901, Brazil
| | - Felipe Bisaggio Pereira
- Departamento de Parasitologia e Programa de Pós-Graduação em Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos, Pampulha, Belo Horizonte, MG, 31270-901, Brazil.
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Jesus WS, Prudente FV, Marques JMC, Pereira FB. Modeling microsolvation clusters with electronic-structure calculations guided by analytical potentials and predictive machine learning techniques. Phys Chem Chem Phys 2021; 23:1738-1749. [PMID: 33427847 DOI: 10.1039/d0cp05200k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We propose a new methodology to study, at the density functional theory (DFT) level, the clusters resulting from the microsolvation of alkali-metal ions with rare-gas atoms. The workflow begins with a global optimization search to generate a pool of low-energy minimum structures for different cluster sizes. This is achieved by employing an analytical potential energy surface (PES) and an evolutionary algorithm (EA). The next main stage of the methodology is devoted to establish an adequate DFT approach to treat the microsolvation system, through a systematic benchmark study involving several combinations of functionals and basis sets, in order to characterize the global minimum structures of the smaller clusters. In the next stage, we apply machine learning (ML) classification algorithms to predict how the low-energy minima of the analytical PES map to the DFT ones. An early and accurate detection of likely DFT local minima is extremely important to guide the choice of the most promising low-energy minima of large clusters to be re-optimized at the DFT level of theory. In this work, the methodology was applied to the Li+Krn (n = 2-14 and 16) microsolvation clusters for which the most competitive DFT approach was found to be the B3LYP-D3/aug-pcseg-1. Additionally, the ML classifier was able to accurately predict most of the solutions to be re-optimized at the DFT level of theory, thereby greatly enhancing the efficiency of the process and allowing its applicability to larger clusters.
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Affiliation(s)
- W S Jesus
- Instituto de Física, Universidade Federal da Bahia, 40170-115 Salvador, BA, Brazil.
| | - F V Prudente
- Instituto de Física, Universidade Federal da Bahia, 40170-115 Salvador, BA, Brazil.
| | - J M C Marques
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - F B Pereira
- Coimbra Polytechnic - ISEC, Coimbra, Portugal and Centro de Informática e Sistemas da Universidade de Coimbra (CISUC), Coimbra, Portugal.
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Negreiros LP, Florentino AC, Pereira FB, Tavares-Dias M. Long-term temporal variation in the parasite community structure of metazoans of Pimelodus blochii (Pimelodidae), a catfish from the Brazilian Amazon. Parasitol Res 2019; 118:3337-3347. [DOI: 10.1007/s00436-019-06480-x] [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: 06/11/2019] [Accepted: 09/25/2019] [Indexed: 01/10/2023]
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Negreiros LP, Pereira FB, Tavares-Dias M. Metazoan parasites of Calophysus macropterus (Siluriformes: Pimelodidae) in the Acre and Iaco rivers in the western Amazon region of Brazil: diversity, similarity and seasonal variation. J NAT HIST 2019. [DOI: 10.1080/00222933.2019.1657195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Luciano Pereira Negreiros
- Postgraduate Network for Amazon Biodiversity and Biotechnology (PPG-BIONORTE), Federal University of Amapá, Macapá, Brazil
| | - Felipe Bisaggio Pereira
- Postgraduate Program on Animal Biology, Biosciences Institute (INBIO), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Brazil
| | - Marcos Tavares-Dias
- Postgraduate Network for Amazon Biodiversity and Biotechnology (PPG-BIONORTE), Federal University of Amapá, Macapá, Brazil
- Embrapa Amapá, Macapá, Brazil
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Pereira FB, Luque JL, Tavares LER. Integrative approach on Pharyngodonidae (Nematoda: Oxyuroidea) parasitic in reptiles: Relationship among its genera, importance of their diagnostic features, and new data on Parapharyngodon bainae. PLoS One 2018; 13:e0200494. [PMID: 29995964 PMCID: PMC6040771 DOI: 10.1371/journal.pone.0200494] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 06/27/2018] [Indexed: 11/18/2022] Open
Abstract
The first integrative approach using sequences of two genes (18S and 28S rRNA) plus morphological and life history traits, was explored in Pharyngodonidae nematodes parasitic in reptiles. Additionally, first genetic characterization of Parapharyngodon bainae and new data on its morphology are given. This approach evaluated the phylogenetic relationships among genera within Pharyngodonidae, as well as the importance of their diagnostic morphological features. Specimens of P. bainae were collected from faecal pellets of the lizard Tropidurus torquatus in the State of Minas Gerais, Brazil. Nematodes were fixed for scanning electron microscopy and molecular procedures. Morphological observations revealed the accurate structures of cephalic end, of cloacal region in males, of vulva and eggs. Phylogenetic reconstructions were based upon four datasets: aligned sequences of the 18S, of the 28S, of both concatenated genes and of combined morphological and molecular datasets. Bayesian inference and maximum likelihood were performed to infer the phylogenies of molecular datasets and maximum parsimony to infer that of all-combined data. Pharyngodonid parasites of reptiles seem to configure two general monophyletic lineages, as previously assertions. Results also showed the monophyly of Spauligodon, Skrjabinodon and Parapharyngodon, as well as the clear separation between the latter and Thelandros. Combination of datasets improved nodal supports. Analysis of the all-combined datasets revealed the importance of vulval position and egg morphology as phylogenetic informative traits. However, characters of male caudal morphology appear as are highly homoplastic, and seem to be product of convergent evolution or multiple losses of ancestral traits. The closely-related Thelandros and Parapharyngodon are kept valid and their diagnosis should be based upon the position of the operculum in eggs (terminal or subterminal, respectively). Some inconsistencies in the scarce molecular and morphological databases were noted. Thus, new genetic data is required for further conclusions and current database must be evaluated with attention.
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Affiliation(s)
- Felipe Bisaggio Pereira
- Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brasil
- * E-mail:
| | - José Luis Luque
- Departamento de Parasitologia Animal, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, Seropédica, Brasil
| | - Luiz Eduardo Roland Tavares
- Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Campo Grande, Brasil
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Marques JMC, Pereira FB, Llanio-Trujillo JL, Abreu PE, Albertí M, Aguilar A, Pirani F, Bartolomei M. A global optimization perspective on molecular clusters. Philos Trans A Math Phys Eng Sci 2017; 375:rsta.2016.0198. [PMID: 28320902 PMCID: PMC5360898 DOI: 10.1098/rsta.2016.0198] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/12/2016] [Indexed: 06/06/2023]
Abstract
Although there is a long history behind the idea of chemical structure, this is a key concept that continues to challenge chemists. Chemical structure is fundamental to understanding most of the properties of matter and its knowledge for complex systems requires the use of state-of-the-art techniques, either experimental or theoretical. From the theoretical view point, one needs to establish the interaction potential among the atoms or molecules of the system, which contains all the information regarding the energy landscape, and employ optimization algorithms to discover the relevant stationary points. In particular, global optimization methods are of major importance to search for the low-energy structures of molecular aggregates. We review the application of global optimization techniques to several molecular clusters; some new results are also reported. Emphasis is given to evolutionary algorithms and their application in the study of the microsolvation of alkali-metal and Ca2+ ions with various types of solvents.This article is part of the themed issue 'Theoretical and computational studies of non-equilibrium and non-statistical dynamics in the gas phase, in the condensed phase and at interfaces'.
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Affiliation(s)
- J M C Marques
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - F B Pereira
- Instituto Superior de Engenharia de Coimbra, Quinta da Nora, 3030-199 Coimbra, Portugal
- Centro de Informática e Sistemas da Universidade de Coimbra (CISUC), 3030-290 Coimbra, Portugal
| | - J L Llanio-Trujillo
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - P E Abreu
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - M Albertí
- IQTCUB, Departament de Ciència de Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain
| | - A Aguilar
- IQTCUB, Departament de Ciència de Materials i Química Física, Universitat de Barcelona, 08028 Barcelona, Spain
| | - F Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, Univertità di Perugia, 06123 Perugia, Italy
| | - M Bartolomei
- Consejo Superior de Investigaciones Científicas (IFF-CSIC), Instituto de Física Fundamental, Serrano 123, Madrid 28006, Spain
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Pereira FB, Pereira ADN, Timi JT, Luque JL. Pseudascarophis brasiliensis sp. nov. (Nematoda: Cystidicolidae) parasitic in the Bermuda chub Kyphosus sectatrix (Perciformes: Kyphosidae) from southeastern Brazil. Mem Inst Oswaldo Cruz 2014; 108:476-80. [PMID: 23828003 DOI: 10.1590/s0074-0276108042013013] [Citation(s) in RCA: 5] [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] [Received: 09/13/2012] [Accepted: 12/18/2012] [Indexed: 11/21/2022] Open
Abstract
A new species of Pseudascarophis (Nematoda: Cystidicolidae) found in the stomach of Kyphosus sectatrix (Linnaeus) (Kyphosidae), off Rio de Janeiro, Brazil, is described. The new species can be differentiated from the other congeners by the presence of lateral alae, distinct but inconspicuous cephalic papillae at the anterior end, three pairs of precloacal and one pair of adcloacal papillae in males, egg morphology and morphometry of glandular oesophagus and spicules. Pseudascarophis tropica is transferred to Ascarophis as Ascarophis tropica (Solov'eva) comb. n. due to its ambiguous diagnosis.
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Affiliation(s)
- Felipe Bisaggio Pereira
- Curso de Pós-Graduação em Ciências Veterinárias, Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brasil
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18
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Pereira FB, Pereira ADN, Luque JL. A new species of Comephoronema (Nematoda: Cystidicolidae) from the squirrelfish Holocentrus adscensionis (Beryciformes: Holocentridae) off Brazil. Folia Parasitol (Praha) 2014; 61:55-62. [PMID: 24684053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A new nematode species, Comephoronema multipapillatum sp. n. (Cystidicolidae), is described from the anterior intestine and caecum of the squirrelfish Holocentrus adscensionis (Osbeck) (Beryciformes: Holocentridae) collected in Angra dos Reis, State of Rio de Janeiro, offshore Brazil. The new species was placed in Comephoronema Layman, 1933 by having an oval oral aperture, four submedian labia, four bilobed submedian sublabia, two narrow lateral pseudolabia and four single cephalic papillae, but mainly by numerous precloacal papillae in males (more than six pairs), in which it differs from species of the otherwise morphologically similar genus Ascarophis van Beneden, 1871. Comephoronema multipapillatum sp. n. can be easily distinguished from other congeners based on the high number of precloacal papillae in males (18 pairs + one unpaired) and also by the bidentate plate structure on the inner margin of pseudolabia, mature eggs with two long filaments on a single pole, body length of male (9.4-11.5 mm) and female (10.2-19.9 mm), left spicule size (222-278 microm) and length ratio of spicules (1 : 2.2-2.8). This is the fifth nominal species of Comephoronema, the first nematode registered parasitizing H. adscensionis and the first species of the genus in the Neotropical part of the Atlantic Ocean.
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Pereira FB, de Nazaré Pereira A, Luque JL. A new species of Comephoronema (Nematoda: Cystidicolidae) from the squirrelfish Holocentrus adscensionis (Beryciformes: Holocentridae) off Brazil. Folia Parasitol (Praha) 2014. [DOI: 10.14411/fp.2014.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Pereira FB, Pereira ADN, Timi JT, Luque JL. Pseudascarophis brasiliensis sp. nov. (Nematoda: Cystidicolidae) parasitic in the Bermuda chub Kyphosus sectatrix (Perciformes: Kyphosidae) from southeastern Brazil. Mem Inst Oswaldo Cruz 2013. [PMID: 23828003 PMCID: PMC3970610 DOI: 10.1590/0074-0276108042013013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A new species of Pseudascarophis (Nematoda: Cystidicolidae) found in the stomach of Kyphosus sectatrix (Linnaeus) (Kyphosidae), off Rio de Janeiro, Brazil, is described. The new species can be differentiated from the other congeners by the presence of lateral alae, distinct but inconspicuous cephalic papillae at the anterior end, three pairs of precloacal and one pair of adcloacal papillae in males, egg morphology and morphometry of glandular oesophagus and spicules. Pseudascarophis tropica is transferred to Ascarophis as Ascarophis tropica (Solov'eva) comb. n. due to its ambiguous diagnosis.
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Affiliation(s)
- Felipe Bisaggio Pereira
- Curso de Pós-Graduação em Ciências Veterinárias, Departamento de
Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ,
Brasil
| | - Aldenice de Nazaré Pereira
- Curso de Pós-Graduação em Ciências Veterinárias, Departamento de
Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ,
Brasil
| | - Juan Tomás Timi
- Laboratorio de Parasitología, Instituto de Investigaciones Marinas y
Costeras, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del
Plata, Mar del Plata, Argentina
| | - José Luis Luque
- Curso de Pós-Graduação em Ciências Veterinárias, Departamento de
Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ,
Brasil, Corresponding author:
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Pereira FB, Valpuesta JM, Basañez G, Goñi FM, Nieva JL. Interbilayer lipid mixing induced by the human immunodeficiency virus type-1 fusion peptide on large unilamellar vesicles: the nature of the nonlamellar intermediates. Chem Phys Lipids 1999; 103:11-20. [PMID: 10701076 DOI: 10.1016/s0009-3084(99)00087-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A peptide corresponding to the 23 N-terminal amino acid residues of the human immunodeficiency virus type-1 (HIV-1) gp41 has the capacity to induce intervesicular lipid mixing in large unilamellar liposomes composed of dioleoylphosphatidylcholine (DOPC), dioleoylphosphatidylethanolamine (DOPE) and cholesterol (CHOL) (molar ratio, 1:1:1). Cryo-transmission electron microscopy (cryo-TEM) of diluted vesicles to which peptides has been externally added reveals a morphology that is compatible with the formation of nonlamellar lipidic aggregates during the time-course of lipid mixing. 31P-nuclear magnetic resonance and 1-(4-trimethylaminophenyl)-6-phenyl-1,3,5-hexatriene (TMADPH) steady-state anisotropy data at equilibrium indicate that the peptide is able to modulate the lipid polymorphism in pelletted membranes by: (i) promoting the thermotropic formation of inverted phases; and (ii) driving the lamellar-to-nonlamellar transition towards the formation of isotropic phases. Therefore, our combined morphological and spectroscopic data reveal the existence of a direct correlation between the ability of the externally added peptide to induce lipid-mixing in dilute liposome samples and its capacity to modulate lipid polymorphism in stacked bilayers.
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Affiliation(s)
- F B Pereira
- Unidad de Biofísica (CSIC-EHU/UPV), Universidad del País Vasco, Bilbao, Spain
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Abstract
The membrane-interacting abilities of three sequences representing the putative fusogenic subdomain of the Ebola virus transmembrane protein have been investigated. In the presence of calcium, the sequence EBO(GE) (GAAIGLAWIPYFGPAAE) efficiently fused unilamellar vesicles composed of phosphatidylcholine, phosphatidylethanolamine, cholesterol, and phosphatidylinositol (molar ratio, 2:1:1:0.5), a mixture that roughly resembles the lipid composition of the hepatocyte plasma membrane. Analysis of the lipid dependence of the process demonstrated that the fusion activity of EBO(GE) was promoted by phosphatidylinositol but not by other acidic phospholipids. In comparison, EBO(EA) (EGAAIGLAWIPYFGPAA) and EBO(EE) (EGAAIGLAWIPYFGPAAE) sequences, which are similar to EBO(GE) except that they bear the negatively charged glutamate residue at the N terminus and at both the N and C termini, respectively, induced fusion to a lesser extent. As revealed by binding experiments, the glutamate residue at the N terminus severely impaired peptide-vesicle interaction. In addition, the fusion-competent EBO(GE) sequence did not associate significantly with vesicles lacking phosphatidylinositol. Tryptophan fluorescence quenching by vesicles containing brominated phospholipids indicated that the EBO(GE) peptide penetrated to the acyl chain level only when the membranes contained phosphatidylinositol. We conclude that binding and further penetration of the Ebola virus putative fusion peptide into membranes might be governed by the nature of the N-terminal residue and by the presence of phosphatidylinositol in the target membrane. Moreover, since insertion of such a peptide leads to membrane destabilization and fusion, the present data would be compatible with the involvement of this sequence in Ebola virus fusion.
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Affiliation(s)
- M B Ruiz-Argüello
- Grupo de Biomembranas (Unidad Asociada al CSIC), Departamento de Bioquímica, Universidad del Pais Vasco, Bilbao, Spain
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Pereira FB, Goñi FM, Muga A, Nieva JL. Permeabilization and fusion of uncharged lipid vesicles induced by the HIV-1 fusion peptide adopting an extended conformation: dose and sequence effects. Biophys J 1997; 73:1977-86. [PMID: 9336193 PMCID: PMC1181098 DOI: 10.1016/s0006-3495(97)78228-6] [Citation(s) in RCA: 122] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The peptide HIV(arg), corresponding to a sequence of 23 amino acid residues at the N-terminus of HIV-1 gp41 (LAV1a strain), has the capacity to destabilize negatively charged large unilamellar vesicles. As revealed by infrared spectroscopy, the peptide associated with those vesicles showed conformational polymorphism: in the absence of cations the main structure was a pore-forming alpha-helix, whereas in the presence of Ca2+ the conformation switched to a fusogenic, predominantly extended beta-type structure. Here we show that an extended structure can also be involved in electrically neutral vesicle destabilization induced by the HIV-1 fusion peptide when it binds the vesicle from the aqueous phase. In the absence of cations, neutral liposomes composed of phosphatidylcholine, phosphatidylethanolamine, and cholesterol (molar ratio 1:1:1) selected for an extended structure that became fusogenic in a dose-dependent fashion. At subfusogenic doses this structure caused the release of trapped 8-aminonaphtalene-1,3,6-trisulfonic acid sodium salt/p-xylenebis(pyridinium)bromide from liposomes, indicating the existence of a peptide-mediated membrane destabilizing process before and independent of the development of fusion. When compared to HIV(arg), the fusion activity of HIV(ala) (bearing the R22 --> A substitution) was reduced by 70%. Fusogenicity was completely abolished when a second substitution (V2 --> E) was included to generate HIV(ala-E2), a sequence representing the N-terminus of an inactive gp41. However, the three sequences associated with vesicles to the same extent, and the three adopted a similar extended structure in the membrane. Whereas 1-(4-trimethylaminophenyl)-6-phenyl-1,3,5-hexatriene emission anisotropy was unaffected by the three peptides, DPH emission anisotropy in membranes was increased only by the fusogenic sequences. Taken together, our observations strongly argue that it is not an alpha-helical but an extended structure adopted by the HIV-1 fusion peptide what actively destabilizes cholesterol-containing, electrically neutral membranes. Moreover, membrane destabilization is modulated by the amino acid sequence in the extended structure. The effect displayed by the aforementioned V2 --> E substitution suggests that the fusion process described here could be reflecting a physiologically relevant phenomenon.
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Affiliation(s)
- F B Pereira
- Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
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Pereira FB, Goñi FM, Nieva JL. Membrane fusion induced by the HIV type 1 fusion peptide: modulation by factors affecting glycoprotein 41 activity and potential anti-HIV compounds. AIDS Res Hum Retroviruses 1997; 13:1203-11. [PMID: 9310287 DOI: 10.1089/aid.1997.13.1203] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Peptides representing a sequence of 23 amino acid residues at the N terminus of human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein gp41 bind and subsequently induce fusion of large unilamellar vesicles (LUV), an activity presumably related to gp41 function in viral infection. These in vitro effects can be modulated by several factors that are known to affect HIV-1 infectivity and gp41-mediated virus-cell fusion. Peptide-induced membrane fusion but not peptide binding can be inhibited by two factors known to block gp41 activity: a polar amino acid substitution V --> E in position 2 and the presence of the N-terminal hexapeptide of gp41 in addition to the parent sequence. Whereas inclusion of the alternative gp120 receptor galactosylceramide in membranes has virtually no effect, membrane cholesterol stimulates fusion activity. In view of its putative physiological relevance, we have used the fusion activity of the peptides as a tool to evaluate the inhibitory effect of antivirals that might target this sequence. We describe three dissimilar effects: Amphotericin B inhibits in a cholesterol-independent way peptide-induced fusion but not binding, human serum albumin inhibits binding and consequently fusion, and dextran sulfate (M(r) 5000) does not affect either binding or fusion.
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Affiliation(s)
- F B Pereira
- Department of Biochemistry and Molecular Biology (Biomembrane Laboratory-CSIC), University of the Basque Country, Bilbao, Spain
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Abstract
The 23-residue synthetic peptide representing the N-terminus of HIV-1 gp41 is known to induce either leakage or fusion of lipid vesicles depending on the experimental conditions. In this paper we report that a polar amino acid substitution V-->E at position 2, known to block gp41 activity in vivo, makes the peptide unable to destabilize and/or fuse membranes. Moreover this variant, unlike the parent peptide, is never found in the membrane-associated beta conformation.
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Affiliation(s)
- F B Pereira
- Department of Biochemistry and Molecular Biology, University of the Basque Country, Bilbao, Spain
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