Correlated effects of selection for immunity in White Leghorn chicken lines on natural antibodies and specific antibody responses to KLH and M. butyricum.
BACKGROUND
The effect of selection for three general immune response traits on primary antibody responses (Ab) to Mycobacterium butyricum or keyhole limpet hemocyanin (KLH) was studied in four experimental lines of White Leghorn chicken. Birds underwent 12 generations of selection for one of three different general immune criteria; high antibody response to Newcastle disease virus 3 weeks after vaccination (ND3), high cell-mediated immune response, using the wing web response to phytohemglutinin (PHA) and high phagocytic activity, measured as carbone clearance (CC). Line ND3-L was selected on ND3, line PHA-L was selected on PHA, and line CC-L on CC, but all lines were measured for all three traits. The fourth line was a contemporary random bred control maintained throughout the selection experiment. Principal component analysis was used to distinguish clusters based on the overall set of immune measures.


RESULTS
In the KLH immunised group, no differences were present between lines for natural antibodies binding to KLH and LPS, and, lines ND3-L and PHA-L had higher titers to LTA and anti-Gal titers measured before the immunisation protocol. The measure of ND3 was correlated positively with LPS titers measured post KLH immunisation and with the difference between LPS titers measured at day 0 and 7 post immunisation. In the M. butyricum immunised group, Line ND3-L showed significantly higher specific antibody response to M. butyricum, and this result agrees well with the hypothesis that the Th-1 pathway was expected to be selected for in this line.


CONCLUSIONS
This study has shown that the two different antigens KLH and M. butyricum gave rise to different responses in the set of selected lines, and that the response was only enhanced for the antigen associated with the same response mechanism as that for the trait (ND3, PHA or CC) for which the line was selected. Interactions between innate and acquired immunity have been observed mainly for the high antibody selected trait, indicating there was a specific interaction due to the selection criterion. Furthermore, the results confirmed the independence between the three selected traits. Finally, principal component analysis contributed to visually discriminate high and low responders to the two new antigens in the four lines.
Minozzi
Giulietta
G
INRA/AgroParisTech, UMR1236 Génétique et Diversité Animales, F-78352 Jouy en Josas, France. giulietta.minozzi@jouy.inra.fr
Parmentier
Henk K
HK
Mignon-Grasteau
Sandrine
S
Nieuwland
Mike Gb
MG
Bed'hom
Bertrand
B
Gourichon
David
D
Minvielle
Francis
F
Pinard-van der Laan
Marie-Helen
MH
D000818:Animals; D000906:Antibodies / Q000097:blood; D000917:Antibody Formation / Q000235:genetics; D002645:Chickens / Q000235:genetics* / Q000276:immunology; D003433:Crosses, Genetic; D004797:Enzyme-Linked Immunosorbent Assay; D006433:Hemocyanins / Q000276:immunology*; D007111:Immunity, Cellular / Q000235:genetics; D009161:Mycobacterium / Q000276:immunology*; D011201:Poultry Diseases / Q000276:immunology*; D025341:Principal Component Analysis; D012641:Selection, Genetic; D013997:Time Factors
D000906:Antibodies; D006433:Hemocyanins; C032808:keyhole-limpet hemocyanin