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A Proteína S100B e o exercício físico

Protein S100B and physical exercise

Resumos

A proteína S100B cerebral tem sido utilizada como um marcador periférico de injúrias do sistema nervoso central (SNC). Entretanto, estudos recentes demonstraram que a S100B também aumenta após o exercício físico, embora o significado desse aumento ainda não esteja bem claro. Apesar de ser liberada, principalmente, por astrócitos, no sistema nervoso central, fontes de produção extracerebral de S100B durante o exercício podem estar implicadas no aumento sérico desta proteína. No entanto, exercícios que implicam impacto ao cérebro como o boxe, por exemplo, o aumento é claramente associado à lesão cerebral. Assim, trabalhos propõem que o aumento da S100B após o exercício estaria relacionado à secreção ativa por adipócitos e músculos lesados. Uma vez que a liberação da S100B pelo músculo lesado seja confirmada experimentalmente, o uso desta proteína poderia ser aprofundado, principalmente, no treinamento esportivo. Atualmente, estamos desenvolvendo protocolos na direção de avaliar o potencial valor da S100B como indicador de lesão do músculo esquelético. Portanto, o objetivo da presente revisão é apresentar o atual estado de conhecimento sobre a relação entre a proteína S100B e o exercício físico, discutindo os possíveis mecanismos envolvidos e propondo novas abordagens.

Sistema Nervoso Central; Proteína S100B; Exercício físico; Lesão muscular


Protein S100B has been used as a peripheral biochemical marker of brain injury and/or activity. However, recent studies have demonstrated that this protein is also increased in serum after physical exercise, although the interpretation of this finding remains controversial. Although predominantly released by astrocytes in the central nervous system, extracerebral sources of protein S100B have been suggested to contribute to the increase in serum levels of this protein. However, in the case of exercises that have an impact on the brain such as boxing, elevated levels are clearly associated with brain damage. More recently, some studies have proposed that protein S100B might be released by activated adipocytes and by damaged muscle cells. If confirmed experimentally, protein S100B might be potentially useful in sports training. We are currently investigating the potential role of serum protein S100B as an indicator of muscle damage. Therefore, the objective of this review was to discuss the current knowledge about the relationship between physical exercise and serum protein S100B and its possible leakage from muscle cells injured by exercise.

Central nervous system; Protein S100B; Physical exercise; Muscle damage


ARTIGO DE REVISÃO

A Proteína S100B e o exercício físico

Protein S100B and physical exercise

Cíntia Mussi Alvim StoccheroI; Alexandre Pastoris MullerII; Álvaro Reischak de OliveiraI; Luis Valmor PortelaII

IUniversidade Federal do Rio Grande do Sul. Escola de Educação Física. Porto Alegre, RS, Brasil.

IIUniversidade Federal do Rio Grande do Sul. Departamento de Bioquímica. Porto Alegre, RS, Brasil.

Correspondencia para Luis Valmor Portela Departamento de Bioquímica, ICBS Universidade Federal do Rio Grande do Sul Rua Ramiro Barcelos 2600, anexo CEP 90035-003 – Porto Alegre, RS. Brasil E-mail: roskaportela@gmail.com

RESUMO

A proteína S100B cerebral tem sido utilizada como um marcador periférico de injúrias do sistema nervoso central (SNC). Entretanto, estudos recentes demonstraram que a S100B também aumenta após o exercício físico, embora o significado desse aumento ainda não esteja bem claro. Apesar de ser liberada, principalmente, por astrócitos, no sistema nervoso central, fontes de produção extracerebral de S100B durante o exercício podem estar implicadas no aumento sérico desta proteína. No entanto, exercícios que implicam impacto ao cérebro como o boxe, por exemplo, o aumento é claramente associado à lesão cerebral. Assim, trabalhos propõem que o aumento da S100B após o exercício estaria relacionado à secreção ativa por adipócitos e músculos lesados. Uma vez que a liberação da S100B pelo músculo lesado seja confirmada experimentalmente, o uso desta proteína poderia ser aprofundado, principalmente, no treinamento esportivo. Atualmente, estamos desenvolvendo protocolos na direção de avaliar o potencial valor da S100B como indicador de lesão do músculo esquelético. Portanto, o objetivo da presente revisão é apresentar o atual estado de conhecimento sobre a relação entre a proteína S100B e o exercício físico, discutindo os possíveis mecanismos envolvidos e propondo novas abordagens.

Palavras-chave: Sistema Nervoso Central; Proteína S100B; Exercício físico; Lesão muscular.

ABSTRACT

Protein S100B has been used as a peripheral biochemical marker of brain injury and/or activity. However, recent studies have demonstrated that this protein is also increased in serum after physical exercise, although the interpretation of this finding remains controversial. Although predominantly released by astrocytes in the central nervous system, extracerebral sources of protein S100B have been suggested to contribute to the increase in serum levels of this protein. However, in the case of exercises that have an impact on the brain such as boxing, elevated levels are clearly associated with brain damage. More recently, some studies have proposed that protein S100B might be released by activated adipocytes and by damaged muscle cells. If confirmed experimentally, protein S100B might be potentially useful in sports training. We are currently investigating the potential role of serum protein S100B as an indicator of muscle damage. Therefore, the objective of this review was to discuss the current knowledge about the relationship between physical exercise and serum protein S100B and its possible leakage from muscle cells injured by exercise.

Keywords: Central nervous system; Protein S100B; Physical exercise; Muscle damage.

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Recebido em 11/09/08

Revisado em 20/11/08

Aprovado em 06/02/09

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  • Luis Valmor Portela
    Departamento de Bioquímica, ICBS
    Universidade Federal do Rio Grande do Sul
    Rua Ramiro Barcelos 2600, anexo
    CEP 90035-003 – Porto Alegre, RS. Brasil
    E-mail:
  • Datas de Publicação

    • Publicação nesta coleção
      06 Fev 2013
    • Data do Fascículo
      Fev 2010

    Histórico

    • Recebido
      11 Set 2008
    • Aceito
      06 Fev 2009
    • Revisado
      20 Nov 2008
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