title: Passive immunoprotection targeting a secreted CAMP factor of Propionibacterium acnes as a novel immunotherapeutic for acne vulgaris.
abstract: Propionibacterium acnes (P. acnes) bacteria play a key role in the pathogenesis of acne vulgaris. Although our previous studies have demonstrated that vaccines targeting a surface sialidase or bacterial particles exhibit a preventive effect against P. acnes, the lack of therapeutic activities and incapability of neutralizing secretory virulence factors motivate us to generate novel immunotherapeutics. In this study, we develop an immunotherapeutic antibody to secretory Christie-Atkins-Munch-Peterson (CAMP) factor of P. acnes. Via agroinfiltration, P. acnes CAMP factor was encapsulated into the leaves of radishes. ICR mice intranasally immunized with whole leaves expressing CAMP factor successfully produced neutralizing antibodies that efficiently attenuated P. acnes-induced ear swelling and production of macrophage-inflammatory protein-2. Passive neutralization of CAMP factor enhanced immunity to eradicate P. acnes at the infection site without influencing bacterial growth elsewhere. We propose that CAMP factor is a novel therapeutic target for the treatment of various P. acnes-associated diseases and highlight the concept of neutralizing P. acnes virulence without disturbing the bacterial commensalism in human microbiome.
authors.affiliation: Department of Medicine, Division of Dermatology, University of California, San Diego, San Diego, CA 92121, USA.
authors.forename: Pei-Feng
authors.initials: PF
authors.lastname: Liu
authors.forename: Teruaki
authors.initials: T
authors.lastname: Nakatsuji
authors.forename: Wenhong
authors.initials: W
authors.lastname: Zhu
authors.forename: Richard L
authors.initials: RL
authors.lastname: Gallo
authors.forename: Chun-Ming
authors.initials: CM
authors.lastname: Huang
mesh_terms: D000152:Acne Vulgaris / Q000628:therapy*; D000818:Animals; D000907:Antibodies, Bacterial / Q000008:administration & dosage*; D057134:Antibodies, Neutralizing / Q000008:administration & dosage; D058491:Bacterial Load; D001426:Bacterial Proteins / Q000037:antagonists & inhibitors* / Q000276:immunology; D005260:Female; D007116:Immunization, Passive / Q000379:methods*; D007167:Immunotherapy / Q000379:methods*; D051379:Mice; D008813:Mice, Inbred ICR; D011425:Propionibacterium acnes / Q000276:immunology* / Q000472:pathogenicity; D037521:Virulence Factors / Q000008:administration & dosage* / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D057134:Antibodies, Neutralizing; D001426:Bacterial Proteins; D037521:Virulence Factors