Traditional western immunoblotting was used to compare the immune response to phase I and phase II antigens of humans with acute and chronic Q fever with that of infected cats, rabbits, cows and raccoons. endocarditis or other intravascular infection and rarely osteomyelitis (1). The objective of this study was to examine the immune response of a variety of animals to phase I and phase II antigens by using Western immunoblotting. MATERIALS AND METHODS Serum samples: Serum samples from eight humans with acute and four with chronic Q fever and from 14 seropositive cats, eight rabbits, eight raccoons, three cows and one dog were used. Determination of antibody titres to phase I and phase II antigen was considered a positive result. Sera were titred to end-point. Western immunoblotting: phase I (CB9M1C7) and phase II (CB9M2C4) whole cells were gamma-irradiated at ?70C with 1.5 to 2 million rads and diluted to 1 1 mg/mL aliquots in phosphate buffered saline. Before use, samples were thawed and centrifuged for 10 mins. The supernatant was discarded and the pellet was resuspended in 1 Rabbit Polyclonal to STK36. mL of Laemmli sample buffer (5) and boiled for 5 mins. One milligram of whole-cell antigen was used in a volume of 1 mL for each set of sodium dodecylsulphate polyacrylamide gel electrophoresis (SDS-PAGE). Molecular mass markers ranging from 200 kDa to 14.3 kDa were prestained KOS953 (Sigma, Missouri) and were prepared according to the manufacturers instructions. In addition, heat shock protein, molecular mass 58 kDa (6), which has homology to heat shock protein, was obtained and was used to identify the antibodies reacting with the heat shock protein. Electrophoresis: Gels were formed in a Biomed Protein II gel electrophoresis unit (Bio Rad). The gel running buffer consisted of 0.3% Tris (Sigma), 1.44% glycine (Sigma) and 0.1% SDS. The pH was adjusted to KOS953 8.3. Electrophoresis was carried out for 4.5 to 6.5 h at 41 to 51 mA. The electrophoresis apparatus was kept cool with running water. Prepared cells and markers were electrophoresed through a 5% stacking gel before separation in a 12.5% polyacrylamide separation gel. Phase I and phase II cells were run simultaneously on different gels. Electrophoretic transfer of proteins to nitrocellulose: Gels were removed from the electrophoresis chamber and equilibrated along with nitrocellulose paper (NCP) in transfer buffer for 30 mins. The transfer buffer, which contained 0.3% Tris and 1.44% glycine, was adjusted to pH 8.3. Electrophoretic transfer was completed for 16 h at 30 V. Traditional western immunoblotting: NCP formulated with moved proteins was rocked KOS953 for 10 mins in buffer formulated with 50 mM Tris, pH 7.4, and 250 mM sodium chloride. The NCP was obstructed for 1.5 h within this buffer with 20% bovine serum albumin (BSA) (Sigma) pH 7, then washed 3 x at room temperature (21C) within a buffer comprising 150 mM sodium chloride, 5 mM EDTA, 50 mM Tris, 0.25% BSA and 0.5% Nonidet P40 KOS953 (Sigma). Major antibody was the pet serum diluted in incubation buffer (clean buffer plus 2% BSA). The diluted serum was put into NCP and rocked for 2 h at area temperatures. The NCP was after that washed five moments with your final clean in clean buffer plus 2% BSA for 5 mins and alkaline phosphatase conjugated goat antihuman (anticat, etc). Immunoglobulin (Ig) G was diluted in incubation buffer, put into NCP and rocked for 1 h at area temperature. The NCP was washed as described above then. Ig destined to protein rings was detected with the Biomed alkaline phosphatase conjugate substrate package as per producer directions. The response was ceased after 1 h by two washings in triple distilled drinking water. RESULTS Serum examples from eight human beings with severe Q fever (four with chronic Q fever), 14 seropositive felines connected with outbreaks of Q fever in human beings (3), KOS953 eight raccoons, one pet dog, three cows and eight rabbits had been examined. All got positive antibody titres to antigens with the indirect immunofluorescence check C data for the serum examples proven in the statistics are given in Table 1. These are representative of the antibody titres for the various animals studied. Figures 1 and ?and22 are representative.