title: Development of Lactobacillus paracasei harboring nucleic acid-hydrolyzing 3D8 scFv as a preventive probiotic against murine norovirus infection.
abstract: The protein 3D8 single-chain variable fragment (3D8 scFv) has potential anti-viral activity due to its ability to penetrate into cells and hydrolyze nucleic acids. Probiotic Lactobacillus paracasei engineered to secrete 3D8 scFv for oral administration was used to test the anti-viral effects of 3D8 scFv against gastrointestinal virus infections. We found that injection of 3D8 scFv into the intestinal lumen resulted in the penetration of 3D8 scFv into the intestinal villi and lamina propria. 3D8 scFv secreted from engineered L. paracasei retained its cell-penetrating and nucleic acid-hydrolyzing activities, which were previously shown with 3D8 scFv expressed in Escherichia coli. Pretreatment of RAW264.7 cells with 3D8 scFv purified from L. paracasei prevented apoptosis induction by murine norovirus infection and decreased messenger RNA (mRNA) expression of the viral capsid protein VP1. In a mouse model, oral administration of the engineered L. paracasei prior to murine norovirus infection reduced the expression level of mRNA encoding viral polymerase. Taken together, these results suggest that L. paracasei secreting 3D8 scFv provides a basis for the development of ingestible anti-viral probiotics active against gastrointestinal viral infection.
authors.affiliation: Department of Genetic Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440-746, Korea.
authors.forename: Phuong Mai
authors.initials: PM
authors.lastname: Hoang
authors.forename: Seungchan
authors.initials: S
authors.lastname: Cho
authors.forename: Kee Eun
authors.initials: KE
authors.lastname: Kim
authors.forename: Sung June
authors.initials: SJ
authors.lastname: Byun
authors.forename: Taek-Kyun
authors.initials: TK
authors.lastname: Lee
authors.forename: Sukchan
authors.initials: S
authors.lastname: Lee
mesh_terms: D000284:Administration, Oral; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D017250:Caliciviridae Infections / Q000188:drug therapy / Q000628:therapy; D036022:Capsid Proteins / Q000235:genetics / Q000378:metabolism; D003001:Cloning, Molecular; D004847:Epithelial Cells / Q000821:virology; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005818:Genetic Engineering; D006868:Hydrolysis; D007422:Intestines / Q000166:cytology / Q000821:virology; D007778:Lactobacillus / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008813:Mice, Inbred ICR; D029322:Norovirus / Q000187:drug effects*; D019936:Probiotics; D000067996:RAW 264.7 Cells; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D057127:Single-Chain Antibodies / Q000096:biosynthesis / Q000494:pharmacology*
chemical_list: D036022:Capsid Proteins; D012333:RNA, Messenger; D057127:Single-Chain Antibodies