Bacterial Adhesion and Entry into Host Cells

“…of the EPEC/ EHEC TTSS is Tir ( t ranslocated i ntimin r eceptor), which is injected into host target cells and then is inserted into the host-cell membrane, where it functions as a receptor for another LEE encoded molecule, the outer membrane protein intimin (Kenny et al., 1997)(Figure 3A).”

“BabA recognizes the Lewis b (Le b ) blood group antigen present on red blood cells and in the gastric mucosa (Ilver et al., 1998); inflammation of the gastric tissue leads to increased expression of other Lewis antigens normally expressed at low levels such as sialylated sLe x and sLe a , and H.…”

“Cdc42 and RhoA are also required for the FimH-dependent cell invasion process by UPEC (Martinez and Hultgren, 2002).”

“Both pathogens trigger important cytoskeletal changes at the host-cell plasma membrane to promote invasion (Cossart and Sansonetti, 2004).”

“…of other Lewis antigens normally expressed at low levels such as sialylated sLe x and sLe a , and H. pylori recognizes these molecules via the sialic acid binding protein (SabA) (Mahdavi et al., 2002), suggesting that H. pylori infection favors the expression of its own receptors in target tissues.”

“…leader peptide for secretion across the inner membrane, a C-terminal domain that forms a pore in the outer membrane, and a passenger domain that is autotransported through the outer membrane pore to be exposed on the bacterial surface, for cleavage in certain cases (Henderson et al., 2004).”

“…effectors, SopE and SopE2, are bona fide guanine nucleotide exchange factors (GEFs) for Cdc42 and Rac1 and mimic host-cell GEFs, catalyzing the GTP loading and activation of these small GTPases, which results in formation of membrane extensions required for bacterial engulfment (Hardt et al., 1998).”

“Invasin is related to EPEC/EHEC intimins and binds with high affinity to multiple members of the b 1 chain integrin family (Isberg and Leong, 1990), subvert-ing normal interactions of these adhesion molecules with fibronectin.”

“…of polymeric adhesive surface structures expressed by many Gram-negative bacteria including pathogens such as EPEC, EHEC, Salmonella enterica serovar Typhi, Pseudomonas aeruginosa, Legionella pneumophila, Neisseria gonorrhoeae , Neisseria meningitidis, and Vibrio cholerae (Craig et al., 2004).”

“These protrusions are morphologically reminiscent of membrane ruffles triggered by T3SS during invasion by mammalian intracellular bacteria such as Salmonella or Shigella spp . in cell culture system [51–54], indicating potential similar host targets for induction of cytoskeletal rearrangement.”

“A critical stage in Salmonella 's pathogenicity depends on its ability to adhere to and invade host cells (Pizarro-Cerdá and Cossart, 2006).”

“To adhere to cells, bacteria use a range of factors, from pili, fimbria, flagella, and other adhesins (62–64).”

“These findings also support the hypothesis that after virus entrance to the host cells, no further viral blocking or inhibition was induced by lactobacilli on the intracellular viral replication processes [30].”

“infection and pathogenesis(25, 26), it can be concluded that the wide presence of this T4SS257 carrying-IncFII(S) type plasmid in S.”

“The pili are the most described adhesins present 27 at the bacterial surface (7, 8).”

“Host cell surfaces are 75 heavily covered by surface carbohydrates that form the glycocalyx layer [1,2].”

“Bacteria also express adhesins (22, 23), pili (24), and 194 secretion systems (25) that target host surface proteins or glycans (26).”

“Molecular complementarity also determines and regulates microbial infectivity (Pizarro-Cerdá and Cossart, 2006; Ribeta and Cossart, 2015).”

“There are some effective factors in bacterial adhesion such as electrostatic and hydrophobic interactions and hydrogen bonds [9] and also the use of surface appendages such as flagella [10] and exopolysaccharides [4].”

“Bacterial adhesion to the surface of cells is typically the initial event in the pathogenesis 64 of infection and can occur through receptor-mediated interactions between the host cell and the 65 pathogen (38).”

“…specific surfaces/cells is necessary for colonization of host tissue and is mediated by surface-exposed adhesins, which generally behave as lectins, recognizing oligosaccharide residues of glycoprotein or glycolipid receptors on the host cell (Pizarro-Cerda and Cossart, 2006; Kline et al., 2009).”

“They play a role in the initial adhesion of bacteria to host tissues and inanimate surfaces [43, 44].”

“…sufficient to impair the bacterium binding. c. Knock-knock: The Chlamydia entry Entry of bacterial pathogens can occur in two non-mutually exclusive mechanisms: through the activation of host receptors or via the translocation of bacterial activators of endocytosis (Pizarro-Cerdá & Cossart, 2006).”

“aeruginosa and UPEC, components of CUP (Chaperone Usher Pathway) fimbriae promote bacterial surface adherence (100).”

“Another example of the use of cell adhesion complexes is in virus and bacteria, which utilize these molecules to establish initial attachments with host-cell receptors [7, 8].”