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Felix-Nascimento G, Lucena RB, da Fonseca CF, da Silva IJS, de Moraes CCN, de Carvalho CAC, de Moura GJB, Vieira FM, Ribeiro LB, de Oliveira JB. Mineral profile and histopathological findings in the liver of white-lipped frog (Leptodactylidae) from the morphoclimatic domain of the Caatingas, Brazil. Environ Sci Pollut Res Int 2024; 31:10750-10765. [PMID: 38206463 DOI: 10.1007/s11356-024-31908-y] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
This study aimed to investigate the mineral profile and histopathological findings in the liver of Leptodactylus macrosternum (white-lipped frog) and to assess the association between melanomacrophage areas and hepatic fungal granuloma with several factors such as weight, snout-cloacal length, sex, hepatosomatic index, season (dry and rainy), and condition factor K. A total of 135 frogs of different ages were collected from three areas in the city of Petrolina, Pernambuco, with varying land use (conventional agriculture, organic agriculture, and Caatinga stricto sensu). The liver of all specimens exhibited changes such as granulomatous lesions, inflammatory cell infiltrate, blood vessel congestion, and sinusoid dilation. The melanomacrophage areas were influenced by weight, snout-cloacal length, and hepatosomatic index. Our findings revealed a positive correlation between body size (weight and snout-cloacal length) and melanomacrophage/hepatic granuloma, while the hepatosomatic index showed a negative relationship. For the condition factor K, only age presents relationship. Eleven elements were quantified for the mineral profile, with aluminum (Al), iron (Fe), and zinc (Zn) being the most abundant in both liver and muscle. Although the histopathological findings and mineral profile of the liver and muscle in this study indicate an effect on the health of L. macrosternum in different collection areas, confirming the relationship between environmental characteristics and these findings requires future studies. Furthermore, long-term studies would be necessary to allow the monitoring of all stages of development of these populations, from tadpoles to adults, for a better evaluation of these effects in L. macrosternum.
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Affiliation(s)
- Gabriela Felix-Nascimento
- Laboratory of Anatomy of Domestic and Wild Animals (LAADS), Federal University of the San Francisco Valley (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco, 56300-000, Brazil.
- Postgraduate Program in Animal Bioscience (PPGBA), Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil.
- Federal University of the San Francisco Valley (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco, 56300-000, Brazil.
| | - Ricardo Barbosa Lucena
- Microscopy Sector of the Center for Agricultural Sciences, Federal University of Paraiba (UFPB), Rodovia PB 079, Km 12, Areia, Paraíba, 58.397-000, Brazil
| | - Cristina Farias da Fonseca
- Brazilian Institute for the Environment and Renewable Natural Resources (IBAMA), Casa Forte, Av. 17 de Agosto 1057, Recife, Pernambuco, 52060-590, Brazil
| | - Iago José Santos da Silva
- Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil
| | - Caio Carvalho Novais de Moraes
- Federal University of the San Francisco Valley (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco, 56300-000, Brazil
| | - Carla Adrielle Costa de Carvalho
- Federal University of the San Francisco Valley (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco, 56300-000, Brazil
| | - Geraldo Jorge Barbosa de Moura
- Postgraduate Program in Animal Bioscience (PPGBA), Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil
- Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil
| | - Fabiano Matos Vieira
- Federal University of the San Francisco Valley (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco, 56300-000, Brazil
| | - Leonardo Barros Ribeiro
- Federal University of the San Francisco Valley (UNIVASF), Rodovia BR-407, Km. 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, Pernambuco, 56300-000, Brazil
| | - Jaqueline Bianque de Oliveira
- Postgraduate Program in Animal Bioscience (PPGBA), Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil
- Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil
- Parasitology Laboratory (LAPAR), Rural Federal University of Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Recife, Pernambuco, 52171-900, Brazil
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Gonçalves PA, Vieira FM, Felix-Nascimento G, de Souza Lima S, Muniz-Pereira LC. Oxysomatium brevispiculum n. sp. (Nematoda: Cosmocercidae) from Amphisbaena alba Linnaeus (Squamata, Amphisbaenidae) in the Cerrado Biome from Brazil. Syst Parasitol 2024; 101:14. [PMID: 38206486 DOI: 10.1007/s11230-023-10129-w] [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: 05/30/2023] [Accepted: 10/18/2023] [Indexed: 01/12/2024]
Abstract
In the present study, we describe Oxysomatium brevispiculum n. sp. (Ascaridida: Cosmocercidae) parasitizing Amphisbaena alba Linnaeus (Squamata: Amphisbaenidae) in the municipality of Uberlândia, Cerrado Biome, Minas Gerais, Brazil. Oxysomatium brevispiculum n. sp. differs from its congeners by having shorter spicules and by the number and arrangement of caudal papillae. The males of the new species have a precloacal unpaired papilla and can be easily distinguished from O. caucasicum in which this morphological trait is absent. Oxysomatium brevispiculum n. sp. differs from the other three species of the genus by the number and arrangement of caudal papillae, with 13 pairs + 1 unpaired precloacal papilla, arrangement 8+1:2:3, while O. brevicaudatum has 14-16 pairs +1 unpaired papilla, and 7-9+1:1:6 arrangement, O. petrolinensis has 16 pairs +1 unpaired papilla, and 8+1:1:7 arrangement, and O. dollfusi with 15-16 pairs +1 unpaired papilla, and 8-9+1:1:6 arrangement. Oxysomatium brevispiculum n. sp. is the fifth species of this genus, the second species in a Neotropical host, and the first species of this genus described in amphisbaenid hosts. In addition, the present study provides an identification key for the species of this genus.
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Affiliation(s)
- Paula Araujo Gonçalves
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (FIOCRUZ), Av. Brasil 4365, Rio de Janeiro, RJ, CEP 21040-900, Brazil
- Programa de Pós-graduação em Biodiversidade e Saúde (PPGBS), IOC, FIOCRUZ, Av. Brasil 4365, Rio de Janeiro, RJ, CEP 21040-900, Brazil
| | - Fabiano Matos Vieira
- 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.
| | - Gabriela Felix-Nascimento
- 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, Universidade Federal do Vale do São Francisco (Univasf), Rodovia BR 407, km 12 - Lote 543 -Projeto de Irrigação Senador Nilo Coelho, s/nº "C1", Petrolina, PE, CEP 56300-990, Brazil
| | - Sueli de Souza Lima
- Laboratório de Taxonomia e Ecologia de Helmintos - Odile Bain, Universidade Federal de Juiz de Fora (UFJF), Rua José Lourenço Kelmer, s/n, Campus Universitário, Juiz de Fora, MG, CEP 36036-900, Brazil
| | - Luís Cláudio Muniz-Pereira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (FIOCRUZ), Av. Brasil 4365, Rio de Janeiro, RJ, CEP 21040-900, Brazil
- Programa de Pós-graduação em Biodiversidade e Saúde (PPGBS), IOC, FIOCRUZ, Av. Brasil 4365, Rio de Janeiro, RJ, CEP 21040-900, 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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Severino ADJM, Rocha AJ, Vieira FM, Muniz-Pereira LC, Souza Lima SD. New reports of parasitism by Synhimantus (Dispharynx) nasuta (Rudolphi, 1819) (Nematoda: Acuariidae) in wild birds in Brazil. Rev Bras Parasitol Vet 2023; 32:e002823. [PMID: 37377293 DOI: 10.1590/s1984-29612023033] [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] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/10/2023] [Indexed: 06/29/2023]
Abstract
The aim of this study was to register the first occurrence of Synhimantus (Dispharynx) nasuta (Nematoda: Acuariidae) in some species of wild birds in Brazil. In addition, the aim was to deepen the knowledge about the morphology of this species through analysis using scanning electron microscopy. Nematodes were collected in wild birds of the species Turdus leucomelas, T. rufiventris, Mimus saturninus, Pitangus sulphuratus, Megascops choliba, Tyto furcata, and Falco sparverius. The morphological and morphometric data observed in the nematodes prove that these parasites are S. (D.) nasuta. This study also provides morphological data from light microscopy and scanning electron microscopy (SEM), as well as the morphometry of this nematode in each host species. Therefore, the current study confirms the first record of this nematode in F. sparverius and T. furcata in South America and, at the same time, these findings expand the host range of this parasite species worldwide, through the first records in M. choliba, M. saturninus, T. leucomelas and T. rufiventris.
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Affiliation(s)
- Allan de Jesus Mendonça Severino
- Laboratório de Helmintoses Intestinais, Departamento de Parasitologia, Universidade Federal de Minas Gerais - UFMG, Campus Pampulha, Belo Horizonte, MG, Brasil
| | - Alex Júnior Rocha
- Laboratório de Taxonomia e Ecologia de Helmintos Odile Bain, Departamento de Zoologia, Universidade Federal de Juiz de Fora - UFJF, Campus Universitário, Juiz de Fora, MG, Brasil
| | | | - Luís Cláudio Muniz-Pereira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil
| | - Sueli de Souza Lima
- Laboratório de Taxonomia e Ecologia de Helmintos Odile Bain, Departamento de Zoologia, Universidade Federal de Juiz de Fora - UFJF, Campus Universitário, Juiz de Fora, MG, Brasil
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da Fonseca CF, Rojas NJJT, Vieira FM, Dos Santos Ferreira AP, da Silva Rodrigues M, de Barros MEG, da Silva Júnior VA, de Moura GJB, de Oliveira JB. Helminth fauna and histopathology associated with parasitic infections in Phrynops geoffroanus (Schweigger, 1812) (Testudines, Chelidae) in a Brazilian river subjected to anthropogenic activities. Vet Parasitol Reg Stud Reports 2021; 26:100639. [PMID: 34879950 DOI: 10.1016/j.vprsr.2021.100639] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 08/24/2021] [Accepted: 09/10/2021] [Indexed: 10/20/2022]
Abstract
The objective of this study was to determine the structure of the helminth fauna and identify the macroscopic and histopathological alterations associated with parasitic infections in Phrynops geoffroanus. Freshwater turtles of both sexes were captured during the dry and rainy seasons in four municipalities along the Capibaribe River. The study included 63 animals, of which 79.37% (50/63) were parasitized by one or more helminths. In total, 933 helminths of seven taxa were recovered: Serpinema monospiculatus, Spiroxys figueiredoi, Nematophila grandis, Polystomoides brasiliensis, Cheloniodiplostomum testudinis, Telorchis birabeni, and Prionosomoides scalaris. Monogeneans and digenetic trematodes were more sensitive to environmental pressures, since the prevalences varied significantly between areas. Nematodes proved to be more resistant to environmental pressure and caused severe injuries to their hosts: nodules in the stomach and small intestine, adhesions in the liver capsule, and pulmonary emphysema. Parasitic granulomas were recorded at the infection sites and in the lungs and liver, the latter caused by migration of S. figueiredoi larvae. This is the first record of P. brasiliensis, N. grandis, C. testudinis, and T. birabeni parasitizing P. geoffroanus in the state of Pernambuco. Histopathology proved to be an important tool for studies on the impact of parasites at the individual, population, and ecosystem levels. Considering the use of the Capibaribe River for public water supply, fishing, and other activities, within the One Health perspective, this study demonstrates that the anthropogenic impact affects parasites and their hosts, in addition to the human population that uses this ecosystem.
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Affiliation(s)
- Cristina Farias da Fonseca
- Programa de Pós-Graduação em Ciência Animal Tropical (PPGCAT), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Laboratório de Parasitologia (LAPAR), Departamento de Biologia, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA), Avenida 17 de agosto 1057, 52060-590 Recife, Pernambuco, Brazil.
| | - Nicolás Jonathan Jesús Tarmeño Rojas
- Programa de Pós-Graduação em Ciência Animal Tropical (PPGCAT), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
| | - Fabiano Matos Vieira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, Brazil
| | - Ana Paula Dos Santos Ferreira
- Laboratório de Patologia Veterinária, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
| | - Midiã da Silva Rodrigues
- Programa de Pós-Graduação em Ciência Animal Tropical (PPGCAT), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Laboratório de Estudos Herpetológicos e Paleoherpetológicos (LEHP), Departamento de Biologia, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
| | - Maria Edna Gomes de Barros
- Laboratório de Histologia, Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
| | - Valdemiro Amaro da Silva Júnior
- Laboratório de Patologia Veterinária, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Laboratório de Histologia, Departamento de Morfologia e Fisiologia Animal, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
| | - Geraldo Jorge Barbosa de Moura
- Programa de Pós-Graduação em Ciência Animal Tropical (PPGCAT), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Laboratório de Estudos Herpetológicos e Paleoherpetológicos (LEHP), Departamento de Biologia, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Programa de Pós-Graduação em Biociência Animal (PPGBA), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Programa de Pós-Graduação em Biodiversidade (PPGBio), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
| | - Jaqueline Bianque de Oliveira
- Programa de Pós-Graduação em Ciência Animal Tropical (PPGCAT), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Laboratório de Parasitologia (LAPAR), Departamento de Biologia, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Programa de Pós-Graduação em Biociência Animal (PPGBA), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Programa de Pós-Graduação em Biodiversidade (PPGBio), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil; Programa de Educação Tutorial Bacharelado em Ciências Biológicas (PET Biologia), Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manuel de Medeiros, 52171-900 Recife, Pernambuco, Brazil
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Ferreira ACS, Vieira FM, DA Silva DCSN, Ribeiro LB, Ferreira JA, Muniz-Pereira LC. Parapharyngodon hispidus n. sp. (Nematoda: Pharyngodonidae) in Tropidurus hispidus (Spix) (Squamata: Tropiduridae) from Caatinga Biome of the Vale do São Francisco, state of Pernambuco, Brazil with a key for the Neotropical species of the genus Parapharyngodon Chatterji. Zootaxa 2021; 4980:195200. [PMID: 34186983 DOI: 10.11646/zootaxa.4980.1.12] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Indexed: 11/04/2022]
Abstract
One species of Parapharyngodon Chatterji (Nematoda: Pharyngodonidae), parasitizing the large intestine of Tropidurus hispidus (Spix) (Squamata: Tropiduridae) in Caatinga biome from Brazil is described and illustrated . This new species differs from a part of its congeners by a set of characters in males: the presence of four pairs of caudal papillae, unpaired post cloacal papilla absent, and smooth anterior cloacal lip. Among the Parapharyngodon species with four pairs caudal papillae, unpaired post clocal papilla absent, and smooth cloacal lips, only P. hispidus n. sp. and P. jairaipurii Rizvi Bursey (Oriental realm), features the same characteristics including sharp pointed tip of spicule, stout terminus or spike of tail of females, and punctate ornamentation of the eggshell. However, these two species are different by the size of spicules (spicules of P. jairaipuri are around 55% of the size spicules of P. hispidus n. sp.); and the arrangement of the caudal papillae (two pairs of adcloacal papillae in P. jaraipuri which are absent in P. hispidus n. sp.). Parapharyngodon hispidus n. sp. is the 55th species assigned to the genus and the 11th species of this genus described in Neotropical hosts.
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Affiliation(s)
- Antonio Carlos Santos Ferreira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz, FIOCRUZ. Av. Brasil 4365, Rio de Janeiro CEP 21040-900, Brazil. Programa de Pós-graduação em Biodiversidade e Saúde (PPGBS), Instituto Oswaldo Cruz, FIOCRUZ. Av. Brasil 4365, Rio de Janeiro CEP 21040-900, Brazil.
| | - Fabiano Matos Vieira
- 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..
| | - Diego C Sar Nunes DA Silva
- 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..
| | - Leonardo Barros Ribeiro
- 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..
| | - Jayelen Alves Ferreira
- 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. Programa de Pós-graduação em Ciências Veterinária no Semiárido, Univasf. Rodovia BR-407, KM 12 Lote 543 S/n Projeto de Irrigação Nilo Coelho, Petrolina, 56300-000, Brazil..
| | - Luís Cláudio Muniz-Pereira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz, FIOCRUZ. Av. Brasil 4365, Rio de Janeiro CEP 21040-900, Brazil. Programa de Pós-graduação em Biodiversidade e Saúde (PPGBS), Instituto Oswaldo Cruz, FIOCRUZ. Av. Brasil 4365, Rio de Janeiro CEP 21040-900, Brazil.
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Vieira FM, GonÇalves PA, Lima SDES, DE Sousa BM, Muniz-Pereira LC. A new species of Aplectana Railliet Henry (Nematoda: Cosmocercidae) br /in Amphisbaena alba Linnaeus (Squamata: Amphisbaenidae) from Minas Gerais State, Brazil. Zootaxa 2020; 4890:zootaxa.4890.2.4. [PMID: 33311234 DOI: 10.11646/zootaxa.4890.2.4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Indexed: 11/04/2022]
Abstract
In the present study, we described and illustrated Aplectana minaensis n. sp. (Ascaridida: Cosmocercidae) from the intestinal caecum of Amphisbaena alba Linnaeus (Squamata: Amphisbaenidae). Aplectana minaensis n. sp. is the 5th species described in Brazilian hosts and 58th species assigned to the genus. This species differs from its congeners by a set of unique characters in males: the presence of one unpaired precloacal papilla and gubernaculum, the papillae pattern (4+1:2:6) and total number (12+1), and the size of spicules (400-605 µm). Among the Aplectana species with an unpaired precloacal papilla and gubernaculum, only A. minaensis n. sp. and A. nebulosa Gomez, González Sanabria, has less than 20 pairs of caudal papillae. However, these species differ in the number of caudal papillae in males (12+1 vs. 13-14+1, respectively); the number and arrangement of post cloacal papillae (6 pairs: 1st to 4th pairs ventral, 5th pair laterodorsal, 6th pairventral vs. five pairs: 1st and 2nd ventral, 3rd lateral, 4th ventral, 5th lateral); and by the size of spicules (413-600 vs. 85-126 µm).
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Affiliation(s)
- Fabiano Matos Vieira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (FIOCRUZ), Av. Brasil 4365, Rio de Janeiro, RJ, CEP 21040-900, Brazil. Programa de Pós Graduação em Biodiversidade e Saúde (PPGBS), IOC, FIOCRUZ. Av. Brasil 4365, Rio de Janeiro, RJ, CEP 21040-900, Brazil.
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Felix-Nascimento G, Vieira FM, Muniz-Pereira LC, Moura GJBDE, Ribeiro LB, Oliveira JBDE. Two new species of Cosmocercidae (Nematoda: Cosmocercoidea) of Leptodactylus macrosternum Miranda-Ribeiro (Anura: Leptodactylidae) from Caatinga Biome, Brazil. Zootaxa 2020; 4877:zootaxa.4877.2.3. [PMID: 33311189 DOI: 10.11646/zootaxa.4877.2.3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 11/10/2020] [Indexed: 11/04/2022]
Abstract
In the current study, two new species of Cosmocercidae nematodes parasitizing the anuran Leptodactylus macrosternum (Leptodactylidae) from two localities in the municipality of Petrolina, sub-middle São Francisco river, state of Pernambuco, Brazil, were described. Oxysomatium petrolinensis n. sp. differs from all congeneric species for having the male caudal papillae distribution pattern unique in this genus, in which the last three pairs of pre-cloacal papillae are located lateroventrally on the anterior border of the cloacal aperture. Additionally, the new species has an unpaired medial precloacal papilla, seven pairs of postcloacal papillae, and a relatively unique spicule size. Oxyascaris caatingae n. sp. differs from all congeneric species mainly for having males with a medial unpaired precloacal papilla and a distribution pattern of caudal papillae unique to this species, being the only species of the genus with adcloacal papillae. The current study proposes the description of Oxysomatium petrolinensis n. sp., fourth species and the first report of this genus in hosts from the Neotropical region. In addition, it describes Oxyascaris caatingae n. sp., which is the fifth species of the genus.
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Affiliation(s)
- Gabriela Felix-Nascimento
- Programa de Pós-graduação em Ciência Animal Tropical (PPGCAT), Universidade Federal Rural de Pernambuco (UFRPE). Rua Dom Manoel de Medeiros, Recife CEP 52051-360, Brazil. Laboratório de Parasitologia, Universidade Federal Rural de Pernambuco (UFRPE), Rua Dom Manoel de Medeiros s/nº, Recife CEP 52051-360, Brazil..
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Vieira FM, Gonçalves PA, Lima SDS, Sousa BMD, Muniz-Pereira LC. A new species of Cruzia (Ascaridida; Kathlanidae) parasitizing Salvator merianae (Squamata, Teiidae) from the Atlantic forest in Brazil. ACTA ACUST UNITED AC 2020; 29:e018519. [PMID: 32294721 DOI: 10.1590/s1984-29612019111] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 12/09/2019] [Indexed: 11/22/2022]
Abstract
Cruzia lauroi sp. nov. is described from Salvator merianae (Duméril & Bibron, 1839) (Squamata; Teiidae). The new species differs from all previously described species through several morphological characteristics: number of tooth like structures per row in the inner pharynx; and presence of unpaired papillae on the anterior border of the cloacal aperture. However, Cruzia lauroi sp. nov. is closest to C. tentaculata (Rudolphi, 1819), through having similar distribution of male caudal papillae, unpaired pre-cloacal papillae and females with an pre-equatorial vulva. Cruzia lauroi sp. nov. differs from C. tentaculata regarding smaller total body length of individuals, higher number of tooth like structures per row in the pharynx, greater size of diverticulum, smaller size of spicules and a more anterior vulva than in C. tentaculata; and the males do not have caudal alae. Cruzia mazza, C. travassosia, C. mexicana and C. testudines were considered to be species inquirendae, because their descriptions need more detailed taxonomic studies.
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Affiliation(s)
- Fabiano Matos Vieira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil.,Programa de Pós-graduação em Biodiversidade e Saúde - PPGBS, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil
| | - Paula Araujo Gonçalves
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil.,Programa de Pós-graduação em Biodiversidade e Saúde - PPGBS, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil
| | - Sueli de Souza Lima
- Laboratório de Taxonomia e Ecologia de Helmintos "Odile Bain", Universidade Federal de Juiz de Fora - UFJF, Campus Universitário, Juiz de Fora, MG, Brasil
| | - Bernadete Maria de Sousa
- Laboratório de Herpetologia-Répteis, Departamento de Zoologia, Universidade Federal de Juiz de Fora - UFJF, Campus Universitário, Juiz de Fora, MG, Brasil
| | - Luís Cláudio Muniz-Pereira
- Laboratório de Helmintos Parasitos de Vertebrados, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil.,Programa de Pós-graduação em Biodiversidade e Saúde - PPGBS, Instituto Oswaldo Cruz - IOC, Fundação Oswaldo Cruz - FIOCRUZ, Rio de Janeiro, RJ, Brasil
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Pilate VJ, Vieira FM, de Sousa BM. Estudo dos hábitos alimentares das serpentes Sibynomorphus neuwiedi e Sibynomorphus mikanii (Squamata, Dipsadidae) de Minas Gerais, Brasil. Cuad Herpetol 2020. [DOI: 10.31017/cdh.2020.(2019-055)] [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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Ribeiro LB, Ferreira ACS, Silva DCN, Vieira FM, Moura GJB. Helminth Parasites of the Lizard Nothobachia ablephara (Gymnophthalmidae) in Caatinga Areas from the Sertão of Brazil. J Parasitol 2018; 104:177-182. [PMID: 29301442 DOI: 10.1645/17-90] [Citation(s) in RCA: 3] [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: 11/10/2022] Open
Abstract
The lizard Nothobachia ablephara is endemic to dune areas and sandy soils adjacent to the São Francisco River in semiarid northeastern Brazil. Forty-nine lizard specimens were collected in 2 Caatinga areas in the municipality of Petrolina in Pernambuco state. Three gastrointestinal helminth taxa were identified, the nematodes Parapharyngodon alvarengai and Physaloptera sp. and the cestode Oochoristica sp. Nothobachia ablephara showed low parasite richness, but high levels of infection by P. alvarengai. There were no significant differences between the parasitism rates of the 2 study areas or between male and female lizards. This is the first study on parasitism in N. ablephara, thereby increasing knowledge of parasite fauna that infect gymnophthalmid lizards in the Sertão of Brazil.
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Affiliation(s)
- L B Ribeiro
- * Universidade Federal do Vale do São Francisco (UNIVASF), Centro de Conservação e Manejo de Fauna da Caatinga (CEMAFAUNA), Av. José de Sá Maniçoba s/n, Centro, CEP 56304-917, Petrolina, Pernambuco, Brazil
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Vieira FM, Muniz-Pereira LC, de Souza-Lima S, Rocha BM, Luque JL. Parasitic nematodes of three species of wild carnivore mammals from Atlantic forest in the state of Minas Gerais, Brazil. REV MEX BIODIVERS 2017. [DOI: 10.1016/j.rmb.2017.10.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Gouveia RV, Novelli IA, Vieira FM, Sousa BMD. Morphological variation of Philodryas patagoniensis (Girard, 1858) (Serpentes, Dipsadidae) from Brazil, based on the study of pholidosis, coloration and morphometric features. Biota Neotrop 2017. [DOI: 10.1590/1676-0611-bn-2016-0237] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract The current study aimed to verify the relationship between the patterns of coloration, the morphometrical features and pholidosis of specimens of Philodryas patagoniensis from Brazil, with the sexual dimorphism of this species. We studied specimens of P. patagoniensis deposited in several herpetological collections from Brazil. A total of 355 specimens were analyzed, of these 145 were males (87 adults and 58 juveniles) and 210 were females (134 adults and 76 juveniles). Adult specimens exhibit sexual dimorphism in snout-vent length, tail length, head length, number of ventral shields, and number of subcaudal shields. The analysis of variance showed that the adult females are significantly longer than adult males, both at snout-vent length and tail length. Females have a greater number of ventral shields (138-210) than males (151-200). The specimens studied also exhibit two distinct patterns of coloration unrelated to geographical or sexual variations.
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Corrêa P, Bueno C, Vieira FM, Muniz-Pereira LC. Helminth parasites of Galictis cuja (Carnivora, Mustelidae), from localities in the Atlantic forest of Brazil. Rev Bras Parasitol Vet 2016; 25:407-413. [DOI: 10.1590/s1984-29612016077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 07/27/2016] [Indexed: 11/22/2022]
Abstract
Abstract The current study aimed to investigate the helminth parasites of a population of Galictis cuja (Carnivora, Mustelidae) that occur in Atlantic Forest in the Southeastern region of Brazil. We necropsied 18 specimens of G. cuja, collected between January 2009 and May 2014, ran over victims on BR-040 highway, between the municipalities of Duque de Caxias, state of Rio de Janeiro and Juiz de Fora, state of Minas Gerais, localities inserted in Atlantic rainforest Biome. A total of six species of helminths were identified: Dioctophyme renale, Molineus elegans, Physaloptera sp., Strongyloides sp., Platynosomum illiciens, and Pachysentis gethi. Molineus elegans, Physaloptera sp. and P. illiciens were recorded for the first time in this host. Data provided in the current study when compared to the previous reports of parasitism by helminths in G. cuja in Brazil demonstrate that this study is the most representative with this host species.
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Soares IA, Vieira FM, Luque JL. Parasite community of Pagrus pagrus (Sparidae) from Rio de Janeiro, Brazil: evidence of temporal stability. ACTA ACUST UNITED AC 2016; 23:216-23. [PMID: 25054501 DOI: 10.1590/s1984-29612014047] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 03/11/2014] [Indexed: 11/22/2022]
Abstract
One hundred specimens of Pagrus pagrus were necropsied for parasitological study between January and February 2012. These data were compared with data from 90 specimens that had been examined in the year 2000. The fish were collected from Cabo Frio (21-23 ° S, 41-45 ° W), in the state of Rio de Janeiro, Brazil. In the current study a total of 19 parasite species were collected. Sixteen of these were collected in the samples of both 2012 and 2000, thus totaling 25 parasite species in the two studies. All the results were similar to those of the previous study with regard to: dominance of anisakid nematode larvae; correlation between abundance of parasites and host body size; absence of correlations between the size of parasite infrapopulations and host sex; and scarcity of interspecific associations. The only difference between the studies was in the abundance values for Anisakidae, which could be correlated with the seasonal factor of the collection period, which was concentrated in the summer. This is also the period of the South Atlantic Central Water (SACW) phenomenon, during which there is greater host reproductive activity. Therefore, significant stability of the metazoan community structure of P. pagrus was shown.
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Affiliation(s)
- Iris Aparecida Soares
- Curso de Pós-graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro ? UFRRJ, Seropédica, RJ, Brasil
| | - Fabiano Matos Vieira
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro UFRRJ, Seropédica, RJ, Brasil
| | - José Luis Luque
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro UFRRJ, Seropédica, RJ, Brasil
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Vieira VSDF, Vieira FM, Luque JL. New morphological data on Cucullanus pinnai pinnai (Nematoda) parasitizing Pimelodus maculatus (Pimelodidae) in southeastern Brazil. Rev Bras Parasitol Vet 2015; 24:155-61. [PMID: 26154955 DOI: 10.1590/s1984-29612015028] [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] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 03/03/2015] [Indexed: 11/21/2022]
Abstract
This paper describes the morphology of Cucullanus pinnai pinnai parasitizing Pimelodus maculatus in the Guandu River, Brazil, based on differential interference contrast (DIC) microscopy and scanning electron microscopy (SEM), providing new morphological data about this species of parasite. Nematodes were collected between May and October 2012 from specimens of Pimelodus maculatus in the Guandu River (22°48'2"S, 43°37'35"W), in the state of Rio de Janeiro, Brazil. Some characteristics of specimens of Cucullanus in this study fall within the range of morphological variations of previously studied C. pinnai pinnai. Most of the specimens studied here had excretory pore and deirids located at the posterior end of the oesophagus, a feature not recorded in previous studies of this species. In addition, the size of the gubernaculum was larger than the other specimens previously studied. The SEM and DIC analyses of C. pinnai revealed several morphological details of the cephalic region and the tail papillae. With regard to the polymorphism of C. pinnai, morphological and genetic studies of this cucullanid nematode are needed, involving large numbers of host species and a wide geographical distribution.
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Affiliation(s)
| | - Fabiano Matos Vieira
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
| | - José Luis Luque
- Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
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Souza DDP, Magalhães CMDFR, Vieira FM, Souzalima SD. [Occurrence of Trypanoxyuris (Trypanoxyuris) minutus (Schneider, 1866) (Nematoda, Oxyuridae) in Alouatta guariba clamitans Cabrera, 1940 (Primates, Atelidae) in Minas Gerais, Brazil]. Rev Bras Parasitol Vet 2010; 19:124-6. [PMID: 20624351 DOI: 10.4322/rbpv.01902011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Accepted: 10/01/2009] [Indexed: 11/23/2022]
Abstract
This study aims to register the occurrence of Trypanoxyuris (Trypanoxyuris) minutus in Alouatta guariba clamitans, in Minas Gerais state, Brazil. Two specimens of A. guariba clamitans, died accidentally, have been necropsied for parasitological studies. Only the large intestine and caecum were infected by T. minutus. The parasitism intensity was 6650 parasites and the density was 2.6 parasites/cm3 of large intestine. In the caecum, the mean intensity was 6753 +/- 490.73 parasites, with mean density of 6.23 +/- 5.13 parasites/cm3. The present study supplies information on adult nematodes biometry and this is the first record of T. (T.) minutus in A. guariba clamitans from Minas Gerais State, Brazil.
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Souza DDP, Magalhães CMDFR, Vieira FM, Souzalima SD. Ocorrência de Trypanoxyuris (Trypanoxyuris) minutus (Schneider, 1866) (Nematoda, Oxyuridae) em Alouatta guariba clamitans Cabrera, 1940 (Primates, Atelidae) em Minas Gerais, Brasil. Rev Bras Parasitol Vet (Online) 2010. [DOI: 10.1590/s1984-29612010000200011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Anteneodo C, Vieira FM. Cavity size distribution in lattice liquids. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1995; 52:6321-6324. [PMID: 9964150 DOI: 10.1103/physreve.52.6321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Vieira FM, Lomas M, Vilariño MR. Laparotomy in patients infected with human immunodeficiency virus: indications and outcome. Br J Surg 1995; 82:136. [PMID: 7881936 DOI: 10.1002/bjs.1800820150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Abstract
The dynamic behavior of some non-linear extensions of the six-state alternating access model for active membrane transport is investigated. We use stoichio-metric network analysis to study the stability of steady states. The bifurcation analysis has been done through standard numerical methods. For the usual six-state model we have proved that there is only one steady state, which is globally asymptotically stable. When we added an autocatalytic step we found self-oscillations. For the competition between a monomer cycle and a dimer cycle, with steps of dimer formation, we have also found self-oscillations. We have also studied models involving the formation of a complex with other molecules. The addition of two steps for formation of a complex of the monomer with another molecule does not alter either the number or the stability of steady states of the basic six-state model. The model which combines the formation of a complex with an autocatalytic step shows both self-oscillations and multiple steady states. The results lead us to conclude that oscillations could be produced by active membrane transport systems if the transport cycle contains a sufficiently large number of steps (six in the present case) and is coupled to at least one autocatalytic reaction,. Oscillations are also predicted when the monomer cycle is coupled to a dimer cycle. In fact, the autocatalytic reaction can be seen as a simplification of the model involving competition between monomer and dimer cycles, which seems to be a more realistic description of biological systems. A self-regulation mechanism of the pumps, related to the multiple stationary states, is expected only for a combined effect of autocatalysis and formation of complexes with other molecules. Within the six-state model this model also leads to oscillation.
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Affiliation(s)
- F M Vieira
- Centro Brasileiro de Pesquisas Fiscias, Rio de Janeiro, Brazil
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