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Influence of temperature, salinity and E. coli tissue content on immune gene expression in mussel: Results from a 2005-2008 survey ArchiMer
Li, Hui; Toubiana, Mylene; Monfort, Patrick; Roch, Philippe.
Several bivalves, including mussels, suffered from mortalities particularly in summer. To look for the possible effect of environmental parameters on immune capacities, Mytilus galloprovincialis were collected monthly from August 2005 to July 2008 from the Palavas Laguna, French Mediterranean coast. Q-PCR was used to quantify the expression of three antimicrobial peptide genes (defensin, mytilin B and myticin B), in addition to lysozyme and HSP70. House keeping gene was 28S rRNA. Defensin, myticin B and lysozyme appeared more expressed in spring-summer than in winter. In contrast, HSP70 expression was higher in winter. Statistical studies using principal component analysis (PCA) and multiple regression models revealed positive influence of temperature on...
Tipo: Text Palavras-chave: Mollusks; Mytilus; Innate immunity; Seasonal variations; Immune survey; Q PCR; HSP70; Lysozyme; Myticin; Mytilin; Defensin; Antimicrobial peptide.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-7345.pdf
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Lysozyme gene expression and hemocyte behaviour in the Mediterranean mussel, Mytilus galloprovincialis, after injection of various bacteria or temperature stresses ArchiMer
Li, H; Parisi, M; Toubiana, Mylene; Cammarata, M; Roch, Philippe.
The aim of the present study was to evaluate the expression of the Mytilus galloprovincialis lysozyme gene in different in vivo stress situations, including injection of bacteria Vibrio splendidus LGP32, Vibrio anguillarum or Micrococcus lysodeikticus, as well as heat shock at 30 C and cold stress at 5 C. Injection of V. splendidus LGP32 resulted in: (i) a general down-regulation of lysozyme gene expression, as quantified by Q-PCR; (ii) reduction in the number of circulating hemocytes; (iii) decrease in the percentage of circulating hemocytes expressing lysozyme mRNA which was now restricted to only small cells, as observed by ISH; and (iv) accumulation of hemocytes expressing lysozyme in the muscle sinus where injection took place. Injection of V....
Tipo: Text Palavras-chave: Molluscs; Mytilus; ISH; Q PCR; Gene expression; Lysozyme; Heat shock; Micrococcus lysodeikticus; Vibrio anguillarum; Vibrio splendidus.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4479.pdf
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