Inhibition of intracellular bacterial replication in fibroblasts is dependent on the perforin-like protein (perforin-2) encoded by macrophage-expressed gene 1

Ryan Mccormack, Lesley R. De Armas, Motoaki Shiratsuchi, Jahir E. Ramos, Eckhard R. Podack

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Fibroblasts are known to eliminate intracellular bacteria, but the lethal hit of the bactericidal mechanism has not been defined. We show that primary embryonic and established fibroblasts can be induced by interferons or by intracellular bacterial infection to express a perforin-like mRNA previously described as macrophage-expressed gene 1 (Mpeg1). The presence and level of the perforin-like mRNA correlate with the ability of primary mouse embryonic fibroblasts (MEF) to eliminate intracellular bacteria. In addition, siRNA knockdown of the perforin-like molecule abolishes bactericidal activity and allows intracellular bacterial replication. Complementation of MEF in which the endogenous perforin-like molecule has been knocked down with a red fluorescent protein-tagged version restores bactericidal activity. The perforin-like molecule has broad bactericidal specificity for pathogenic and non-pathogenic bacteria, including Gram-positive and -negative, and acid fast bacteria. The perforin-like molecule renders previously lysozyme-resistant bacteria sensitive to lysis by lysozyme suggesting physical damage of the outer cell wall by the perforin-like protein. MEF damage cell walls of intracellular bacteria by insertion, polymerization, and pore formation of the perforin-like protein, analogous to pore formers of complement and perforin-1 of cytolytic lymphocytes. We propose the name perforin-2.

Original languageEnglish
Pages (from-to)185-194
Number of pages10
JournalJournal of Innate Immunity
Volume5
Issue number2
DOIs
StatePublished - Mar 1 2013
Externally publishedYes

Fingerprint

Perforin
Fibroblasts
Macrophages
Genes
Proteins
Bacteria
Muramidase
Cell Wall
Complement C1
perforin 2
Messenger RNA
Gram-Positive Bacteria
Bacterial Infections
Polymerization
Interferons
Small Interfering RNA
Names
Lymphocytes
Acids

Keywords

  • Bactericidal activity
  • Immune defense
  • Innate immunity
  • Intracellular bacterial replication
  • Non-phagocytic cells

ASJC Scopus subject areas

  • Immunology and Allergy

Cite this

Inhibition of intracellular bacterial replication in fibroblasts is dependent on the perforin-like protein (perforin-2) encoded by macrophage-expressed gene 1. / Mccormack, Ryan; De Armas, Lesley R.; Shiratsuchi, Motoaki; Ramos, Jahir E.; Podack, Eckhard R.

In: Journal of Innate Immunity, Vol. 5, No. 2, 01.03.2013, p. 185-194.

Research output: Contribution to journalArticle

Mccormack, Ryan ; De Armas, Lesley R. ; Shiratsuchi, Motoaki ; Ramos, Jahir E. ; Podack, Eckhard R. / Inhibition of intracellular bacterial replication in fibroblasts is dependent on the perforin-like protein (perforin-2) encoded by macrophage-expressed gene 1. In: Journal of Innate Immunity. 2013 ; Vol. 5, No. 2. pp. 185-194.
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