Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\28411186.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol 2017 ; 198 (10): 4036-45 Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Direct antimicrobial activity of Interferon-? #MMPMID28411186
Kaplan A; Lee MW; Wolf AJ; Limon J; Becker CA; Ding M; Murali R; Lee EY; Liu GY; Wong GCL; Underhill DM
J Immunol 2017[May]; 198 (10): 4036-45 PMID28411186show ga
Type I interferons are a cytokine family essential for antiviral defense. More recently, type I interferons have been shown to be important during bacterial infections. Here we show that, in addition to known cytokine functions, interferon-? (IFN-?) is also antimicrobial. Parts of the IFN-? molecular surface (especially helix 4) are cationic and amphipathic, both classic characteristics of antimicrobial peptides, and we have observed that IFN-? can directly kill Staphylococcus aureus. Further, a mutant S. aureus that is more sensitive to antimicrobial peptides was killed more efficiently by IFN-? than the wild-type S. aureus, and immunoblotting showed that IFN-? interacts with the bacterial cell surface. To determine whether specific parts of IFN-? are antimicrobial, we synthesized IFN-? helix 4 and found that it is sufficient to permeate model prokaryotic membranes using synchrotron x-ray diffraction and that it is sufficient to kill S. aureus. These results suggest that in addition to its well-known signaling activity, IFN-? may be directly antimicrobial and be part of a growing family of cytokines and chemokines, called kinocidins, that also have antimicrobial properties.