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Selective induction of hemocytic response in Ruditapes philippinarum (Bivalvia) by different species of Vibrio (Bacteria)

Published online by Cambridge University Press:  15 April 1996

Radouane Oubella
Affiliation:
Laboratoire « Flux de matière et réponse du vivant », URA CNRS D1513, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, BP 809, 29285 Brest Cedex, France
Philippe Maes
Affiliation:
Laboratoire « Flux de matière et réponse du vivant », URA CNRS D1513, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, BP 809, 29285 Brest Cedex, France
Bassem Allam
Affiliation:
Laboratoire « Flux de matière et réponse du vivant », URA CNRS D1513, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, BP 809, 29285 Brest Cedex, France
Christine Paillard
Affiliation:
Laboratoire « Flux de matière et réponse du vivant », URA CNRS D1513, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, BP 809, 29285 Brest Cedex, France
Michel Auffret
Affiliation:
Laboratoire « Flux de matière et réponse du vivant », URA CNRS D1513, Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, BP 809, 29285 Brest Cedex, France
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Abstract

Adult, healthy Manila clams, Ruditapes philippinarum, were inoculated in the laboratory with different, possibly pathogenic bacteria species to study the cellular immune responses. Challenging the clams with Vibrio P1, the causative agent of brown ring disease, induced significant increased total hemocyte counts three days post-challenge. The triggering role of the number of bacteria in the inoculum suggested a threshold for inducing the host response. In addition, a significant decrease of hyalinocytes and an increase of granulocytes revealed a modification in hemocyte population balance. No response was observed in individuals that received either heat killed-Vibrio P1, V. anguillarum or V. pelagius. These experiments demonstrate in R. philippinarum the influence of bacterial parameters on the selective induction of host immunodefence mechanisms. The biological processes by which intra-pallial inoculation of Vibrio P1 stimulates the internal defence system of the host has not yet been identified but the role of some bacterial factors (toxins, adherence capacity) is discussed.

Type
Research Article
Copyright
© IFREMER-Gauthier-Villars, 1996

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Selective induction of hemocytic response in Ruditapes philippinarum (Bivalvia) by different species of Vibrio (Bacteria)
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