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Enhancement of Apx toxin production in Actinobacillus pleuropneumoniae serotypes 1, 2, and 5 by optimizing culture conditions.
Journal of Microbiology and Biotechnology 2020 March 28
Actinobacillus pleuropneumoniae (APP) is a causative agent of porcine pleuropneumonia. Therefore, the development of an effective vaccine for APP is necessary. Here, we optimized the culture medium and conditions to enhance the production yields of Apx toxins in APP serotype 1, 2, and 5 cultures. The use of Mycoplasma Broth Base (PPLO) medium improved both the quantity and quality of the harvested Apx toxins compared with Columbia Broth (CB) medium. Calcium chloride (CaCl2 ) was first demonstrated as a stimulation factor for the production of Apx toxins in APP serotype 2 cultures. Cultivation of APP serotype 2 in PPLO medium supplemented with 10 μg/ml of nicotinamide adenine dinucleotide (NAD) and 20 mM CaCl2 yielded the highest levels of Apx toxins. These findings suggest that the optimization of the culture medium and conditions increases the concentration of Apx toxins in the supernatants of APP serotype 1, 2, and 5 cultures and may be applied for the development of vaccines against APP infection.
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