Clostridioides difficile Toxin A receptor complex (TcdA receptor complex)

The Intestinal epithelial toxin A receptor complex refers to the assembly of host cell surface molecules, such as sucrase-isomaltase (SI), glycoprotein 96 (gp96), and the nerve growth factor receptor (p75NTR), that mediate the binding and internalization of Clostridioides difficile Toxin A (TcdA) (Pothoulakis et al., 1996; Na et al., 2008; Yuan et al., 2015). TcdA is a potent enterotoxin and a primary virulence factor in C. difficile infections, causing significant mucosal damage, inflammation, and fluid secretion (Gerhard, 2017). The receptor complex facilitates the endocytosis of TcdA, which subsequently glucosylates host Rho-family GTPases, leading to the collapse of the actin cytoskeleton and disruption of the intestinal barrier (Voth & Ballard, 2005). This molecular cascade results in the clinical symptoms of pseudomembranous colitis and severe diarrhea (Kelly & LaMont, 2008). Therapeutic strategies have focused on neutralizing TcdA using monoclonal antibodies like actoxumab to prevent its association with these receptors (Lowy et al., 2010). Although actoxumab was developed to target this interaction, clinical success has been more pronounced with therapies targeting Toxin B, reflecting the complex synergy between the two toxins in human disease (Wilcox et al., 2017).

Other names

TcdA receptorC. difficile Toxin A receptorSucrase-isomaltase (TcdA receptor)gp96 (TcdA receptor)HSP90B1 (TcdA receptor)p75NTR (TcdA receptor)NGFR (TcdA receptor)

Neutralization of Toxin A to prevent its interaction with host cell surface receptors and subsequent internalization into enterocytes.