Phenotype and Antimicrobial Activity Of Th17 Cells Induced by Propionibacterium Acnes Strains Associated with Healthy And Acne Skin

Overview

Journal J Invest Dermatol

Publisher Elsevier

Specialty Dermatology

Date 2017 Sep 3

PMID 28864077

Citations 47

Authors

George W Agak

Stephanie Kao

Kelsey Ouyang

Min Qin

David Moon

Ahsan Butt

Jenny Kim

Affiliations

Soon will be listed here.

Abstract

Studies of the human skin microbiome suggest that Propionibacterium acnes strains may contribute differently to skin health and disease. However, the immune phenotype and functions of T helper type 17 (Th17) cells induced by healthy (P) versus acne (P) skin-associated P. acnes strains are currently unknown. We stimulated peripheral blood mononuclear cells from healthy donors and observed that P strains induce higher IL-17 levels than P strains. We next generated P and P strain-specific Th17 clones and show that P. acnes strains induce Th17 cells of varied phenotype and function that are stable in the presence of IL-2 and IL-23. Although P- and P-specific clones expressed similar levels of LL-37 and DEFB4, only P-specific clones secreted molecules sufficient to kill P. acnes. Furthermore, electron microscopic studies showed that supernatants derived from activated P and not P-specific clones exhibited robust bactericidal activity against P. acnes, and complete breaches in the bacterial cell envelope were observed. This antimicrobial activity was independent of IL-26, because both natural IL-26 released by Th17 clones and rhIL-26 lacked antimicrobial potency against P. acnes. Overall, our data suggest that P. acnes strains may differentially modulate the CD4 T-cell responses, leading to the generation of Th17 cells that may contribute to either homeostasis or acne pathogenesis.

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