• Vaccine Name: B. pertussis Cpn60 protein vaccine
• Target Pathogen: Bordetella pertussis
• Target Disease: Whooping Cough
• Vaccine Ontology ID: VO_0011357
• Type: Subunit vaccine
• Status: Research
• Antigen: B. pertussis cpn60/60 kDa chaperonin
• cpn60 gene engineering:
  • Type: Recombinant protein preparation
  • Description: Fraction BS was applied to a Mono Q Sepharose (Amersham, Biosciences) (0.5 mg protein per ml resin) previously equilibrated with 25 mM Tris–HCl, pH 8.0. Proteins were eluted with a NaCl gradient (0–1 M) in 25 mM Tris–HCl, pH 8.0, in 0.5 ml fractions at a flow rate of 1 ml/min. Elution was monitored at A280 nm. The fractions showing the same peak profile were pooled and eluted again under the same chromatography conditions. Samples were submitted to sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) (T = 12.5% in 0.75 M Tris, 0.2% SDS, pH 8.8) and electrophoresis was performed at 60 mA in 25 mM Tris, 0.192 M glycine, 0.1% SDS, pH 8.3. The gel was stained with silver nitrate and fractions showing a similar molecular mass profile were pooled, concentrated by centrifugation at 440 × g in Centrifugal Ultrafree-20 tubes, 10 kDa (Millipore), and their protein concentration was evaluated. Four pools were formed (P1, P2, P3, P4), and used for immunization of mice (Cainelli et al., 2007).
  • Detailed Gene Information: Click Here.
• Immunization Route: Subcutaneous injection

Mouse Response

• Host Strain: BALB/c
• Vaccination Protocol: Female BALB/c mice, 4–6 weeks old (Animal House of the Instituto Butantan) (9–15 mice/group) were subcutaneously injected three times at weekly intervals (days 0, 7, 14) with BS pools (P1, P2, P3, P4) (1 μg/0.1 ml/mouse), and two times (days 0 and 14) with 73 kDa or 60 kDa proteins (1 μg/0.1 ml/mouse) alone or mixed with Diphtheria-Pertussis-Tetanus (DPT) vaccine formulated without aluminum hydroxide (NA-DPT), (2 μl/mouse), (Instituto Butantan). Current DPT vaccine containing aluminum hydroxide (DPTBut) was used as control (2 μl/mouse) (Lot no. 0008147/0 and 0309132, Instituto Butantan). Non-immunized mice (injected with physiologic saline) were used as control (Cainelli et al., 2007).
• Challenge Protocol: Animals were challenged by intracerebral route (i.c.) with live B. pertussis (strain 18323, NIH, USA), 21 days after the first immunization. Each mouse was inoculated with 30,000 live bacteria. Deaths were recorded until day 15 (Cainelli et al., 2007).
• Efficacy: High levels of antibodies were induced, and a 78% protection rate of mice challenged with live B. pertussis was observed. The Cpn60/60 kDa chaperonin, one protein identified in the fraction, stimulated antibodies against pertussis and induced a 42% protection rate against the challenge (Cainelli et al., 2007).