Immune Responses of BALB/c Mice to a Polyvalent
Salmonella typhimurium
Ghost Vaccine Constructed Using a Dual-Regulated
E Gene and a Foreign
Antigen Delivery System
Se Won Kim1, Sang Wan Gal2,
John Hwa Lee3, Young-Sool Hah4, Tae Wan Kim5, Jeong Dong Bahk1,
Chul Wook Kim5, Il-Suk Kim5,* and Sam Woong
Kim5,*
1Division of Applied
Life Sciences (BK21 & EBNCRC), Graduate School of Gyeongsang
National University, Jinju, South Korea; 2Department of Pharmaceutical Engineering, Gyeongnam National University of
Science and Technology, 33 Dongjinro, Jinju, South Korea;3College
of Veterinary Medicine, Chonbuk National University, Chon-ju
561-756, South Korea; 4Clinical Research Institute, Gyeongsang National University Hospital,
Jinju, South Korea. 5Swine Science and Technology Center, Gyeongnam National University of Science and
Technology, South Korea *Corresponding author: swkim@gntech.ac.kr (S.W. Kim) or iskim@gntech.ac.kr
(C.W. Kim)
Abstract
In order to induce stringent regulation of ghost
cassette, a new ghost system was designed so that
E gene is regulatedbycI857 of a temperature sensitive regulator and antisense RNA under arabinose
system at transcriptional and translational levels, respectively. The
constructed system under stringent regulation owing to both regulatory factors
was designed as pMMP184 which carries pBR replication origin. A ghost cell
obtained from S. typhimuriumharboring pMMP184 was
examined for immune response after injection via intramuscular (IM) route
against BALB/c mouse. The immune responses IgG, IgG1, IgG2a and vaginal IgA of
the mice against S. typhimurium ghost cells were increased suddenly at 4
weeks post injection and maintained until 10 weeks. Additionally, pathogenic
E. coli antigens, such as FedA, FedF,
F41 and intimin, carried in the ghost cells elicited similar immune responses to
those of S. typhimurium
lipopolysaccharide. Proliferations of T and B cells, indicated by elevations of
CD3e and CD23, respectively, were observed using FACS analysis.The challenge assays against sublethal dose of virulent S. typhimurium
were presented by protections of 25~50% more than that of control. Our
results suggest that the S. typhimurium ghost cell produced from the new ghost system is a
potential possibility as a ghost vaccine.
Key words:
ara operon, asdGhost vaccine, Salmonella typhimurium, Temperature-sensitive