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In order to evaluate the pharmacokinetics of recombinant bovine interferon-alpha (rBoIFN-α) in cattle, which has potential for its antiviral and immunomodulatory activities, 12 animals of 6-month age were classified into 4 groups (n=3) to receive rBoIFN-α through IV, IM or SC routes at a dose of 5.0×103 IU/kg. Serum rBoIFN-α titer was evaluated using cytopathic effect (CPE) inhibition bioassay. Then, the standard pharmacokinetic parameters were calculated using the DAS (Drug and statistics) software. The concentration-time profiles of serum rBoIFN-α following IM administration, SC administration and IV administration were characteristics of the 1-, 1-, and 2-compartment open models, respectively. After a single dose of IV administration, the drug rapidly dispersed and was rapidly eliminated from the body (T1/2α=0.15±0.02 h, T1/2=6.48±0.49 h). After IM and SC administrations, the drug is rapidly absorbed and slowly eliminated from the body (For IM administration, Tmax=6.12±0.32 h, T1/2=8.19±0.74 h) (For SC administration, Tmax=4.06±0.56 h, T1/2=7.29±0.55 h). The bioavailability of rBoIFN-α after IM administration is 53.74%, which is higher than the bioavailability of SC administration (27.96%). Therefore, the results showed that the drug administration effect can be preferably obtained following a single dose IM injection using the rBoIFN-α aqueous preparation. We hope that this study will provide valuable information for the clinical application of rBoIFN-α as an potential antiviral agent.

Herein, we reported an Escherichia coli-based expression and purification method of recombinant porcine interferon alpha (rPoIFN-α). PoIFN-α coding sequence was cloned into pMD18-T vector and then subcloned into pET-32a (+) vector using standard recombinant DNA techniques and the resulting plasmid was transformed into BL21(DE3) competent cells. After induction with isopropyl-β-D-1-thiogalactopyranoside (IPTG), rPoIFN-α was purified from the supernatant of the bacteria lysate using a simple two-step chromatography process consisting of a Ni2+ affinity chromatography and a DEAE anion exchange chromatography. rPoIFN-α was purified to >95% homogeneity with a yield of 48 mg/L of culture. It has isoelectic point of 6.09 and bacterial endotoxin was less than 1 EU/mg. N-terminal amino acid sequence and the peptide map digested by trypsin provided additional evidence for the authenticity of rPoIFN-α. The biological activity of rPoIFN-α was 1.1×106 IU/ mL in HEp-2/ Vesicular Stomatitis Virus (VSV) titration system and its specific activity reached to 1.0×106 IU/mg. In conclusion, we obtained high-level expression of a soluble form of bioactive rPoIFN-α by using pET-32a (+) prokaryotic expression system.

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