M1 protein from Streptococcus pyogenes induces nitric oxidemediated vascular hyporesponsiveness to phenylephrine: Involvement of toll-like receptor activation.
Streptococcus pyogenes carrying M1 protein causes the severe and increasingly prevalent streptococcal toxic shock syndrome and necrotizing fasciitis. M1 protein is an important virulence factor of Streptococcus pyogenes and induces an inflammatory response in human monocytes. We wanted to investigate if purified M1 protein in solution could induce vascular nitric oxide (NO) production leading to v