Reference : Effect of exogenous circulating anti-bPL antibodies on bovine placental lactogen measure...
Scientific journals : Article
Life sciences : Veterinary medicine & animal health
http://hdl.handle.net/2268/41509
Effect of exogenous circulating anti-bPL antibodies on bovine placental lactogen measurements in foetal samples.
English
Alvarez Oxiley, Andrea Vivian [Université de Liège - ULg > > > Doct. sc. vété. (Bologne)]
Melo de Sousa, Noelita mailto [Université de Liège - ULg > Département de sciences fonctionnelles > Physiologie de la reproduction >]
Hornick, Jean-Luc mailto [Université de Liège - ULg > Département de productions animales > Nutrition des animaux domestiques >]
Touati, Kamal mailto [Université de Liège - ULg > Département clinique des animaux de production (DCP) > Département clinique des animaux de production (DCP) >]
van der Weijden, Gysbert C [University of Utrecht, the Netherlands > Department of Farm Animal Health, Faculty of Veterinary Medicine > > > >]
Taverne, Marcel Am [University of Utrecht, the Netherlands > Department of Farm Animal Health, Faculty of Veterinary Medicine > > > >]
Szenci, Otto [Szent Istvan University, Budapest, Hungary > Clinic for Large Animals, Faculty of Veterinary Science > > >]
Beckers, Jean-François mailto [Université de Liège - ULg > Département de sciences fonctionnelles > Physiologie de la reproduction >]
2010
Acta Veterinaria Scandinavica
Danske Dyrlaegeforening
52
9
Yes (verified by ORBi)
International
0044-605X
1751-0147
Vanlose
Denmark
[en] bPL ; antibodies ; bovine ; foetus
[en] BACKGROUND: The involvement of placental lactogen (PL) in the regulation of foetal growth has been investigated in different species by in vivo immunomodulation techniques. However, when circulating antibodies are present together with the hormone, the procedure for hormonal measurement becomes considerably complex. The aim of this study was the immunoneutralization of bovine placental lactogen (bPL) concentrations in bovine foetal circulation by direct infusion of rabbit anti-bPL purified immunoglobulins (IgG) via a foetal catheter (in vivo study). The ability of a RIA based on guinea pig anti-bPL antiserum, for the measurement of bPL concentrations in samples containing exogenous rabbit anti-bPL immunoglobulins, was also analyzed in in vitro and in vivo conditions. METHODS: Six bovine foetuses were chronic cannulated on the aorta via the medial tarsal artery. Infusion of rabbit anti-bPL IgG was performed during late gestation. Pooled rabbit anti-bPL antisera had a maximal neutralization capacity of 25 microg bPL/mL of immunoglobulin. Interference of rabbit anti-bPL immunoglobulin with radioimmunoassay measurement using guinea pig anti-bPL as primary antibody was first evaluated in vitro. Polyclonal anti-bPL antibodies raised in rabbit were added in foetal sera to produce 100 samples with known antibodies titers (dilutions ranging from 1:2,500 till 1:1,280,000). RESULT(S): Assessment of the interference of rabbit anti-bPL antibody showed that bPL concentrations were significantly lower (P < 0.05) in samples added with dilutions of rabbit antiserum lower than 1:80,000 (one foetus) or 1:10,000 (four foetuses). It was also shown that the recovery of added bPL (12 ng/mL) was markedly reduced in those samples in which exogenous rabbit anti-bPL were added at dilutions lower than 1:20,000. Concentrations of foetal bPL were determined in samples from cannulated foetuses. In foetuses 1 and 6, bPL concentrations remained almost unchanged (<5 ng/mL) during the whole experimental period. In Foetus 3, bPL concentrations decreased immediately after IgG infusion and thereafter, they increased until parturition. CONCLUSION(S): The use of a bPL RIA using a guinea pig anti-bPL as primary antiserum allowed for the measurement of bPL concentrations in foetal plasma in presence of rabbit anti-bPL IgG into the foetal circulation. Long-term foetal catheterization allowed for the study of the influence of direct infusion of anti-bPL IgG on peripheral bPL concentrations in bovine foetuses.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/41509
10.1186/1751-0147-52-9

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