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Salgado APC, Soares-Martins JAP, Andrade LG, Albarnaz JD, Ferreira PCP, Kroon EG, Bonjardim CA. Study of vaccinia and cowpox viruses' replication in Rac1-N17 dominant-negative cells. Mem Inst Oswaldo Cruz 2013; 108:554-62. [PMID: 23903969 DOI: 10.1590/s0074-02762013000500004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 05/13/2013] [Indexed: 11/22/2022] Open
Abstract
Interfering with cellular signal transduction pathways is a common strategy used by many viruses to create a propitious intracellular environment for an efficient replication. Our group has been studying cellular signalling pathways activated by the orthopoxviruses Vaccinia (VACV) and Cowpox (CPXV) and their significance to viral replication. In the present study our aim was to investigate whether the GTPase Rac1 was an upstream signal that led to the activation of MEK/ERK1/2, JNK1/2 or Akt pathways upon VACV or CPXV' infections. Therefore, we generated stable murine fibroblasts exhibiting negative dominance to Rac1-N17 to evaluate viral growth and the phosphorylation status of ERK1/2, JNK1/2 and Akt. Our results demonstrated that VACV replication, but not CPXV, was affected in dominant-negative (DN) Rac1-N17 cell lines in which viral yield was reduced in about 10-fold. Viral late gene expression, but not early, was also reduced. Furthermore, our data showed that Akt phosphorylation was diminished upon VACV infection in DN Rac1-N17 cells, suggesting that Rac1 participates in the phosphoinositide-3 kinase pathway leading to the activation of Akt. In conclusion, our results indicate that while Rac1 indeed plays a role in VACV biology, perhaps another GTPase may be involved in CPXV replication.
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Affiliation(s)
- Ana Paula Carneiro Salgado
- Grupo de Transdução de Sinal/Orthopoxvirus e Flavivírus - LABVÍRUS, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
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Salgado APC, Soares-Martins JAP, Andrade LG, Albarnaz JD, Ferreira PCP, Kroon EG, Bonjardim CA. Study of vaccinia and cowpox viruses' replication in Rac1-N17 dominant-negative cells. Mem Inst Oswaldo Cruz 2013; 108. [PMID: 23903969 PMCID: PMC3970603 DOI: 10.1590/0074-0276108052013004] [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: 11/16/2022] Open
Abstract
Interfering with cellular signal transduction pathways is a common strategy used by many viruses to create a propitious intracellular environment for an efficient replication. Our group has been studying cellular signalling pathways activated by the orthopoxviruses Vaccinia (VACV) and Cowpox (CPXV) and their significance to viral replication. In the present study our aim was to investigate whether the GTPase Rac1 was an upstream signal that led to the activation of MEK/ERK1/2, JNK1/2 or Akt pathways upon VACV or CPXV' infections. Therefore, we generated stable murine fibroblasts exhibiting negative dominance to Rac1-N17 to evaluate viral growth and the phosphorylation status of ERK1/2, JNK1/2 and Akt. Our results demonstrated that VACV replication, but not CPXV, was affected in dominant-negative (DN) Rac1-N17 cell lines in which viral yield was reduced in about 10-fold. Viral late gene expression, but not early, was also reduced. Furthermore, our data showed that Akt phosphorylation was diminished upon VACV infection in DN Rac1-N17 cells, suggesting that Rac1 participates in the phosphoinositide-3 kinase pathway leading to the activation of Akt. In conclusion, our results indicate that while Rac1 indeed plays a role in VACV biology, perhaps another GTPase may be involved in CPXV replication.
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Affiliation(s)
- Ana Paula Carneiro Salgado
- Grupo de Transdução de Sinal/Orthopoxvirus e Flavivírus - LABVÍRUS , Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil
| | - Jamária Adriana Pinheiro Soares-Martins
- Grupo de Transdução de Sinal/Orthopoxvirus e Flavivírus - LABVÍRUS , Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil , Department of Microbiology and Molecular Genetics, Medical College
of Wisconsin, Milwaukee, WI, USA
| | - Luciana Garcia Andrade
- Grupo de Transdução de Sinal/Orthopoxvirus e Flavivírus - LABVÍRUS , Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil
| | - Jonas Dutra Albarnaz
- Grupo de Transdução de Sinal/Orthopoxvirus e Flavivírus - LABVÍRUS , Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil
| | - Paulo César Peregrino Ferreira
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil
| | - Erna Geessien Kroon
- Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil
| | - Cláudio Antônio Bonjardim
- Grupo de Transdução de Sinal/Orthopoxvirus e Flavivírus - LABVÍRUS , Laboratório de Vírus, Departamento de Microbiologia, Instituto de
Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG,
Brasil , Corresponding author:
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de Abreu Corrêa A, Albarnaz JD, Moresco V, Poli CR, Teixeira AL, Oliveira Simões CM, Monte Barardi CR. Depuration dynamics of oysters (Crassostrea gigas) artificially contaminated by Salmonella enterica serovar Typhimurium. Mar Environ Res 2007; 63:479-89. [PMID: 17280712 DOI: 10.1016/j.marenvres.2006.12.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2006] [Revised: 12/10/2006] [Accepted: 12/10/2006] [Indexed: 05/13/2023]
Abstract
The State of Santa Catarina produces the greatest quantity of edible mollusks in Brazil. To guarantee sanitary qualify, mollusk cultures should be monitored for contamination by pathogenic microorganisms. A self-purification or "depuration" system that eliminates Salmonella enterica serovar Typhimurium contamination from oysters has been developed and evaluated. The depuration process occurred within a closed system, in which 1000 L of water was recirculated for 24 h. The water was sterilized with ultraviolet (UV) light, chlorine, or both together. Oysters (Crassostrea gigas) artificially contaminated with S. typhimurium were harvested every 6 h. Samples of oyster tissue were excised and both the presence and numbers of bacteria were determined. Combined UV light and chlorine treatments resulted in total elimination of bacteria within 12 h. Polymerase chain reaction detected bacteria in water exposed to the three treatments. This pioneering study is the first of its kind in Brazil and represents a major contribution to commercial mollusk culture in this country.
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Affiliation(s)
- Adriana de Abreu Corrêa
- Laboratório de Virologia Aplicada, Departamento de Microbiologia e Parasitologia, CCB, Campus Universitario Trindade, 88040-900 Florianópolis-SC, Brazil
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